fevir scan2 skin temperature measurement systemg... · 2020. 5. 22. · these guidelines are in...

© Thermoteknix Systems Ltd 2020

FevIR Scan2

Skin Temperature

Measurement System

Operation Manual

Part No - GC010006

April 2020 - Version 2.7

© Thermoteknix Systems Ltd 2020

Revision history

Date Version Notes

24/01/2020 1.0 Document release

16/02/2020 2.0 Document re-write

14/03/2020 2.1 Minor typographical corrections

30/03/2020 2.2 Updated to include FevIR Cam software

06/04/2020 2.3 Updates to match Software release V2.9.3.0

15/04/2020 2.4 Updates to follow QSG guidance (Distance)

16/04/2020 2.5 Added new Blackbody

17/04/2020 2.6 Guidance on distances added

20/04/2020 2.7 Additions and more detailed guidance in line with

ISO standard

23/04/2020 2.8 Formatting corrections

© Thermoteknix Systems Ltd 2020 3

Contents

1 FevIR Scan 2 Product Information ................................................................................. 5

2 IMPORTANT NOTICE ......................................................................................................... 6

3 Terminology: ..................................................................................................................... 9

4 Introduction .................................................................................................................... 10

4.1 Package checklist ................................................................................................. 10

4.2 Introduction to FevIR Cam 2 technology .......................................................... 11

5 Select your monitoring site .......................................................................................... 12

6 Start monitoring ............................................................................................................. 14

7 Typical Operation........................................................................................................... 18

7.1 The alarm image gallery ..................................................................................... 20

7.2 Defining the screening area: (Setup Menu, F7) ............................................... 23

7.3 Scanning Area (Setup menu, F7) ........................................................................ 24

7.4 Setting up the image and alarms (Setup menu, F7) ....................................... 25

7.5 Password ................................................................................................................ 26

7.6 Setup Menu ............................................................................................................ 27

7.7 Alarm Tab .............................................................................................................. 27

7.7.1 Warning Temperature .................................................................................. 27

7.7.2 Temperatures above the Warning threshold ......................................... 28

7.7.3 Alarm On/Off delay and Timed Save ...................................................... 28

7.7.4 Saved Image folder .................................................................................... 28


7.7.5 Alarm Sound................................................................................................ 28

7.8 Recording Tab ....................................................................................................... 29

7.9 Display Tab ............................................................................................................ 30

7.9.1 Current FevIR Cam Location .................................................................... 30

7.9.2 Units ............................................................................................................. 30

7.9.3 Layout .......................................................................................................... 31

7.9.4 Colour Palette ............................................................................................ 31

7.9.5 Temperature Labels .................................................................................. 31

7.10 The Scanning Tab ................................................................................................. 32

7.10.1 Scanning Area ............................................................................................. 32

7.11 The Blackbody Temperature Reference Tab.................................................... 33

7.11.1 Blackbody reference temperature Marker size and location ............. 34

7.12 The FevIR Cam Tab .............................................................................................. 35

7.13 Saved images ......................................................................................................... 36

8 Fault Finding ..................................................................................................................... 37

8.1 Temperature measurement ................................................................................ 37

8.1.1 Setup the Alarm Threshold value ............................................................ 39

8.2 Shortcuts ................................................................................................................ 40

9 Skin temperature measurement .................................................................................. 41

10 Labelling ..................................................................................................................... 43

11 Software installation ................................................................................................ 44

11.1 Installing FevIR Cam software ............................................................................ 44

12 Disposal ....................................................................................................................... 50

13 Support: ...................................................................................................................... 51


1 FevIR Scan 2 Product Information

FevIR Scan 2 is a telethermography system designed to perform initial body

temperature measurement for triage use. The system is intended to measure the

skin temperature of the face and in particular, the temperature of the inner canthus

of the eye, or forehead which are typically 1C (1.6F) below body core temperature.

The detection of an elevated body temperature measurement must be confirmed by

the use of a secondary evaluation methods (e.g., non-contact infrared thermometer

(NCIT) or clinical grade contact thermometer).

A statement of measurement accuracy and calibration are included with each camera

and blackbody reference unit:

The temperature measurement uncertainty (accuracy), is less than or equal to

±0.5°C (±0.9°F) over the temperature range of 34-39°C (93.2-102.2°F)

An accurate, calibrated blackbody ThermaRef 35B1, traceable to UK National

Physical Laboratory (NPL) is included with each system to ensure accuracy of

measurement and correction/compensation of any system drift. It must be installed

in direct line of sight with the camera, equidistant to the subject inspection point

and set to a temperature of 35°C on the unit controller.

The FevIR Scan camera and ThermaRef 35B1 should be left for 15 minutes after

power on to enable both units to stabilise before use.

Both stability and drift are less than 0.2°C (0.36°F) within an 8 hour time frame as

measured and tested by Thermoteknix Systems Ltd. (Data available on request).

The FevIR Scan 2 Camera FSD01 and ThermaRef 35B1 have been tested and certified

to CE and FCC certification including electrical safety and the Low Voltage directive.

The system is supplied with FevIR Scan 2 software installed on a single notebook

computer. The software should be operated in accordance with the guidance in this

Operation Manual.


2 IMPORTANT NOTICE

Temperature measurements made using the FevIR Scan 2 system should not be solely

or primarily relied upon to diagnose or exclude a diagnosis of COVID-19 or any other

disease.

An elevated body temperature in the context of use must be confirmed by a suitably

trained person with secondary evaluation methods (e.g., an NCIT or clinical grade

contact thermometer)

Operation of the system must only be carried out with the ThermaRef 35B1

blackbody supplied in operation and placed at the same point (same horizontal

plane) and distance from the camera as the subject inspection point to comply with

system accuracy and performance. The inspection point must be between 1 and 3m

(3.2 to 9.5ft) from the camera. The system self-check and continuous self-test will

show a “System Not Ready” on screen message and a warning triangle which will

prevent system operation if the blackbody is not present, operational, or withing the

field of view.

Only one person at a time must be presented to the camera at the inspection point

The FevIR Scan 2 system has an automatically operated, self-calibrating, Non-

Uniformity Correction (NUC) calibration shutter fitted in front of the thermal lens,

immediately inside the front face of the camera. Do not insert any object into this

opening or attempt to interfere with the operation of the shutter. Any interference

to the operation of the shutter may cause permanent damage to the unit and render

the Manufacturer’s Warranty invalid.

The FevIR Scan 2 camera model FSD01 and the ThermaRef 35B1 units must be re-

calibrated annually from the last date of calibration. This date is shown on the

certificates supplied with the equipment and by a label fixed to each device. Please

contact Thermoteknix for assistance.


The equipment must be set up for subject inspection in a temperature controlled

indoor environment. The location should be free from draughts, heater or air

conditioning ducts, and away from doorways. An environmental temperature

between 20°C and 24°C (68°F to 75°F) and Relative Humidity between 10% and 50%

should be maintained.

Instructions for arranging the camera, blackbody and person screening distance are

detailed in the Instruction Manual and should be observed. It is important that the

subject screening point is aligned with the location of the ThermaRef 35B1 blackbody

to ensure both are at the same distance from the camera focus point (1 – 3m, 3.2ft –

9.5ft).

In the event that the equipment must be moved from one location to another, close

down the software on the computer first, then power off each item individually, dis-

connect all cables and return them safely to the heavy-duty transport case provided

with the system. Re-assemble in accordance with the directions stated in the

Instruction Manual.


This equipment is not designed or intended for use as a medical device. This device

is not FDA-cleared or approved. However, as a telethermographic device originally

intended for industrial, construction and commercial use it can be repurposed to

assist in initial screening for fever and triage of individuals in high traffic areas such

as airports and businesses under guidance issued by the US Food and Drug

Administration (FDA).

https://www.fda.gov/media/137079/download

These guidelines are in accordance with ISO Standard:

BS (EN) IEC 80601-2-59:2019 “Safety an essential performance of screening thermographs for human febrile temperature screening.”

Users should operate the system in accordance with the operating guidelines to maintain full ISO compliance. These guidelines are given in: PD ISO/TR 13154:2017 “Deployment, implementation and operational guidelines for identifying febrile humans using a screening thermograph.”

https://www.fda.gov/media/137079/download


3 Terminology:

The FevIR Scan 2 system employs two key components, these are:

• FevIR Scan Camera;Model FSD01: Referred to throughout this manual as the

“FevIR Camera”.

• ThermaRef Blackbody; Model 35B1: Referred to throughout this manual as

the “Calibration Reference Source”.


4 Introduction

4.1 Package checklist

You need to make sure that you have everything for your FevIR Scan system.

Check that you have:

1. FevIR Scan Camera FSD01 (inc. Visible & IR) with power supply

2. Network and USB cables (2m)

3. ThermaRef 35B1 Calibration Reference Source with power supply

4. Laptop

5. FevIR Cam 2 software and Manual on USB stick

Optional items:

1. Tripods for FevIr Cam and Calibration Reference Source

2. Ceiling mounts for FevIR Cam and blackbody


4.2 Introduction to FevIR Cam 2 technology

The Thermoteknix FevIR Cam 2 uses the latest technology of thermal imaging

infrared the FevIR Cam combined with a high-resolution CCD colour visible camera in

a single housing. A blackbody temperature reference unit is a separate device which

maintains its front surface at a constant pre-set temperature and which is accurate

to within ±0.2°C.

The best hand-held type of thermal imaging cameras, when used alone, are very

sensitive to difference in temperature but are only accurate to within ±2°C for

actual temperature so are unable to differentiate between a skin temperature of 37

or 39°C. This makes them wholly unsuitable for use as a fever screening tool.

The Thermoteknix FevIR Cam 1 and FevIR Cam 2 systems include a scientific,

blackbody (termed a “Calibration Reference Source”) within the field of view of the

FevIR Cam. The blackbody reference source is set to 35°C and this enables the FevIR

Cam’s normally achieved ±2°C measurement accuracy to be increased to ±0.2°C

which will determine if a skin temperature is above 37.5°C versus 37.0°C and is

suitable for skin temperature monitoring. This extra accuracy is so important that

the FevIR Cam 2 software constantly monitors the Calibration Reference Source up to

20 times per second and in the event that the Calibration Reference Source is

moved, or the FevIR Cam misaligned or either of the units malfunctioning, then an on

screen alarm is shown and fever screening is paused until the error condition is

resolved.

The Thermoteknix FevIR Cam system cannot be operated without an approved

Calibration Reference Source reference unit in the field of view at all times and with

the calibration software circle tool correctly in position over the centre of the

Calibration Reference Source reference.


5 Select your monitoring site Decide where you want to perform fever monitoring. You need to choose a place

where your subjects can be directed to pass through the FevIR Cam field of view. It

should be possible to move subjects identified by FevIR Cam with an over threshold

temperature from the primary Scanning zone to a private area for confirmation of

core temperature by measurement with a clinical, approved thermometer and

possible isolation.

It is essential that the blackbody is mounted at a fixed location within the field of

view and it is in alignment with the infrared the FevIR Cam and it’s on-screen

calibration circle. This is necessary to ensure that the FevIR Cam temperature

measurement accuracy is maintained at all times. A software function (available on

the setup menu) will check continuously that the FevIR Cam and Calibration

Reference Source are stable and that the calibration circle software tool is correctly

aligned with the Calibration Reference Source. If either of these parameters are not

met (e.g. if the Calibration Reference Source or FevIR Cam the FevIR Cam have been

accidentally moved), a warning triangle and message will be shown on screen and

Scanning will not be available.

The site selected should be free from drafts such as doors or air conditioner vents,

heating radiators or hot machinery, and where the ambient temperature is

reasonably constant and between 20°C and 24°C.

The inspection site should be at a reasonable distance from the exterior of the

building to avoid sudden changes in ambient temperature for subjects entering from

a hot environment to a cold one or vice versa as this causes rapid changes in blood

flow and changes in skin temperature.

Subjects should be requested to remove hats, headgear, eye glasses and facemasks

before proceeding through the checkpoint.

Ropes or gating should be used to keep subjects within the monitoring area. It is not

necessary from a system perspective for subjects to be monitored in single file

although individual monitoring will make the management of the Scanning process a

much easier process.

The Calibration Reference Source needs to be between 1 to 3m distance from the

FevIR Cam the FevIR Cam. Subjects should be measured at the same distance as the

Calibration Reference Source.


To ensure that it is always in the FevIR Cam’s field of view the Calibration Reference

Source can be mounted above the height of the subjects’ heads using a Thermoteknix

FevIR Cam ceiling mount or third-party product. The FevIR Cam must be aligned to

view directly into the draft shield fixed to the front surface of the Calibration

Reference Source.

Alternatively, the Calibration Reference Source can be table or tripod mounted with

the direct line of sight roped off to prevent any person passing between the FevIR

Cam and its direct, unhindered view of the Calibration Reference Source.

The Calibration Reference Source is supplied with a DC power supply for connection

to 110-240VAC mains power. It must be mounted in a location with a stable ambient

temperature, free from draughts and direct sunlight. It is important to ensure that

nothing obstructs the cooling fan located on the side of the device.


6 Start monitoring Setting the system up is straight forward. The supplied laptop has been pre-

configured with the FevIR Cam 2 monitoring software installed and your complete

system has been connected and tested in the factory before shipping to you. Once

you have decided where you want to perform the monitoring, you need to position

the FevIR Cam and Calibration Reference Source, connect the cables and start the

FevIR Cam software.

Installing (or re-installing) the software should not be necessary, but is described

later in this document.

The FevIR Cam head and laptop should be mounted on the FevIR Cam station

platform facing the approaching subjects and with the Calibration Reference Source

temperature reference within the field of view of the FevIR Cam.


The Calibration Reference Source is powered by a 12V DC power supply.

The FevIR Cam is powered by a 5V DC power supply.

Plug in and connect the power cord from the DC power supplies to the respective

Calibration Reference Source unit and the FevIR Cam.

It is recommended to mark the floor at the same distance from the FevIR Cam to the

Calibration Reference Source so that subjects can be checked at a consistent

distance.


The FevIR Cam unit is connected to the laptop using both the network and USB

cables.

The laptop must also be connected to USB, network and power.

The equipment should be turned on for approximately 20 minutes prior to use. The

Calibration Reference Source needs time to stabilise at the required temperature,

and reach thermal equilibrium. This ensures reliable and reproducible temperature

measurement.


To start FevIR Cam software, double-click its desktop icon. The application will start

and assuming the FevIR Cam head is connected and turned on you will see visible and

thermal pictures appearing on the screen. The image appears with an operator

location label in the upper left corner of the screen. The location label can be

changed as required.

A temperature palette bar is located on the right hand side of the image and

determines monochrome, or, false colours used to display the image. The bar is a

typically graduated scale of either black (cold) through to white (hot), or a user

selectable colour palette available for selection on the setup menu All temperatures

measured by the system which are at or below the low point of the temperature

scale are shown in black, or the bottom scale colour, similarly all temperature at the

top or above the top scale value are shown in white, or the top scale colour.

However, all temperatures from the Alarm threshold temperature, which in this case

has been set to 37°C, to the hot upper temperatures are highlighted with a red

isotherm to signify that the temperature represented has reached or exceeded an

alarm condition.

Note the small yellow circle on the infrared image which is located directly onto the

Calibration Reference Source which is mounted on top of the tripod. This is used as

the system reference temperature and provides the necessary temperature

measurement accuracy for the system.


7 Typical Operation A number of screen arrangements can be selected from the setup menu. The side by

side mode is shown here with the visible image on the left and the IR image on the

right.

In this screen arrangement the alarm information is displayed at the top and any

temperatures on the IR image measured above the alarm value will be coloured red.

The actual temperature is shown in a red box adjacent to the subject’s face and will

move with them as they move position in the scene.

Below the threshold temperature and in a larger font. Normally this will be below

the threshold temperature and the font colour will be green. During an alarm

condition the readout will change to red.

Alarm text will also be overlaid on the thermal image, stating “Check subject with an

approved thermometer”. Skin may be unusually hot for reasons other than a fever

(see section 5). Core temperature must be measured to confirm a fever. This must be

taken with a thermometer in a medically approved method, e.g. a tympanic

membrane or oral temperature measuring thermometer.

The software is typically set up to capture a still thermal and visible image when

each alarm condition happens. These are shown in the pair of thumbnail images in

the lower part of the screen. These are always the latest images captured. Warning

text is not overlaid on the stored still images when they are recalled.


To review previous alarm image captures, click on either the folder icon (on the left

of the thumbnail images), or the magnifying glass icon (on the right). This will open a

gallery window showing you the saved alarm images. Use the left and right arrow

keys to scroll back or forwards to earlier/later alarms.


7.1 The alarm image gallery Selecting the magnifying glass icon opens a window showing one capture at a time,

as below:

The top left and right arrow scroll through captures, sequentially.

The bottom two icons allow image printing and saving for permanent reference.

Images not specifically filed will be sequentially overwritten by new images after the

image buffer is full (typically 20,000 images).

This example shown is purely for illustration and not representative of a clinical

situation. The forced capture was triggered by the heat of a hot drink.


The folder icon opens the FevIR Cam image gallery:

This is more convenient if you need to review many images at a time, or search for a

particular past time and date record.

Image files are automatically named according to the following protocol:

FevIR_2020-03-10_10-51-29_+0000_V.jpg

The date and time format identifies their order in time. The “+nnnn” indicates any

time offset, and the “_V” indicates a visual image. “_I” indicates an infrared image.


Changing the displayed palette is easily done from the Setup menu (F7).


With the read-out temperature is the status display:

Green for normal condition

Red for an alarm condition

Or a warning triangle if the system is not ready. This

will be shown if the blackbody reference temperature

is not yet at its operating temperature and stable, or if

the FevIR Cam unit is not ready or stable.

When an alarm is triggered an audible alert is played

and a red circle drawn around the above alarm

threshold pixels. This helps the monitoring staff to

identify and isolate the potentially febrile subject for

further tests.

7.2 Defining the screening area: (Setup Menu, F7) To ensure the correct operation of the system, the system operator must configure

two regions of the display.

The first region is to locate the calibration reference measurement tool over the

centre of the Calibration Reference Source. It is important that the Calibration

Reference Source unit is placed outside the intended area for Scanning. It is not

important whether the Calibration Reference Source is above or to the side of the

active Scanning area. Typically this will depend on whether the unit is ceiling or

floor mounted. It is essential that the view of the Calibration Reference Source

temperature from the position of the FevIR Cam cannot be obscured by persons

walking through the Scanning area. The calibration circle is drawn in yellow and

should be positioned so that it encloses the central heated area of the Calibration

Reference Source. This identifies the pixels that are at the calibration temperature

of the Calibration Reference Source and enables the system software combined with


the FevIR Cam factory pre-calibration to ensure ± 0.2°C accurate temperature

measurements.

The Calibration Reference Source is set to a midscale value of 35.0°C. Unlike the

internal body temperature which is very carefully maintained by the body at 37.0°C

(98.4°F), skin temperature is usually lower than internal body temperature and

varies with many factors, but typically will also be raised in the presence of fever.

A common consideration is that head temperature is generally 2.0°C lower than

core body temperature, except over the inner aspect of the orbit of the eye (eye

socket, closest area to the nose). The area around the inner aspect of the orbit is

served by a small artery which is just below the surface and this provides a close

approximation to core (inner) body temperature. This is a better indicator of

core temperature than the forehead which can have a raised surface temperature

due to many non-fever causes, whereas the temperature of the inner aspect of

the orbit is much more closely related to fever temperatures.

The ambient temperature will have a significant effect and you may want to change

this value higher or lower, depending on predominant skin temperature values

obtained in the location of use.

7.3 Scanning Area (Setup menu, F7) The second region to be defined is the Scanning area. This is outlined by a white

rectangle and should be positioned to enclose the screen area in which target

subjects will be monitored. A high temperature threshold (typically set above 45°C)

will exclude any objects at this temperature or above from the Scanning area

measurement. This is to ensure that any hot objects (lights, coffee cups,

transformers etc.) do not trigger the monitoring region alarm.

Use the mouse cursor on the boundary to change the area size, hold the left mouse

button down anywhere inside the area to move the whole area from place to place.

Do not include the Calibration Reference Source heated reference area within the

area to be scanned; left click and move it to the desired position.


7.4 Setting up the image and alarms (Setup menu, F7) It is straightforward to set up the image and alarms using the dedicated menu

functions. To access the menu, right click anywhere on the application or press F2.

To display the setup dialog directly press F7. This shortcut is useful in full screen

mode.

The system is designed to run without operator intervention once it has been setup

correctly. To set the monitoring conditions, the operator first has to enter into Setup

mode by entering the password. Once this has been correctly entered the setup

dialog can be accessed through the same menu.


7.5 Password FevIR Cam uses a password protection system to stop casual or unauthorised changes

to the setup parameters. The default password is 000000 (six zeros) but this can be

changed to a stronger and more secure password of your choice using the “Change

Password” menu selection.

The password is hidden from view as it is entered by displaying a series of bars. This

prevents accidental disclosure. There are just two password levels. The normal

password level for operators does not allow access to the setup functionality; this is

called the “Operator” password level. The “Setup” password level is accessed by

entering the correct password and the system will remain at this level in the absence

of keystrokes for a pre-determined timeout period. This timeout period can be

changed and the default period is 5 minutes. This feature prevents inadvertently

leaving the software in the setup mode.


7.6 Setup Menu The FevIR Cam application has one dialog box with functionality grouped for

convenience under five tabs. Settings can be changed in any of the five tabs and they

will all be saved when “OK” is selected and discarded when “Cancel” is pressed.

Saved values will be restored to the system when the FevIR Cam application is re-

started.

7.7 Alarm Tab

7.7.1 Warning Temperature

The “Warning temperature” can be used to identify subjects with elevated

temperature but not exceeding the “Alarm Threshold” temperature. This feature can

be enabled or disabled by clicking the tick in the radio button.

The “Threshold temperature” is used to set the alarm condition, temperatures

detected at this temperature and hotter will activate the alarm.

Temperatures above the “upper” limit are not drawn in red or used to trigger

alarms. This useful feature means that hot articles that are irrelevant to fever

monitoring do not cause spurious alarm conditions.


7.7.2 Temperatures above the Warning threshold

This value can be set to show live temperatures in circles related to subject’s heads

as they walk towards the temperature test zone. In the absence of an alarm

threshold it gives an indication to persons passing the Scanning zone that the system

is working and that their temperature has been measured. Typically this value

should be set to one or two degrees below the alarm threshold. If this feature is not

required for display on screen, uncheck the Warning temperature box.

7.7.3 Alarm On/Off delay and Timed Save

The alarm on and off delay affect the alarm hysteresis and when set correctly these

values will avoid alarms flicking on and off for temperatures near to the threshold

temperature value. Once an alarm has been triggered in will stay active for the time

set before the Alarm Off time expires (2 seconds in the illustration shown).

FevIR Cam automatically saves an infrared and visible image when an alarm is

triggered. When “Timed Save (seconds)” is set to zero (the default) only one image

pair is saved. If you set a value for this field then an image will be saved periodically

during an alarm condition at the set time interval.

7.7.4 Saved Image folder

The Saved Image Folder field allows you to store the images in different folder to the

default. This can be to a network drive if appropriately connected and configured.

7.7.5 Alarm Sound

The Alarm sound field allows you to select a different alarm sound to play when an

alarm is triggered. Browse to the appropriate directory and select an alternative

sound file.


7.8 Recording Tab

The FevIR Cam system includes the capability of recording images when an alarm is

triggered. The default condition is that both these boxes are ticked and images will

be saved on the system.

However, in some countries GDPR and other privacy laws may make this feature

undesirable, particularly in public areas where consent may not be sought in

advance. In these cases the user can chose to save either or neither images by un-

ticking these boxes.


7.9 Display Tab

The display tab sets the temperature span for the infrared image. If the displayed

image is black then the low setting has probably been set too high and all

temperatures are below the set value. Conversely an image that is completely white or red would indicate that the high

temperature and/or the alarm threshold temperature have been set to too low a

value and all the temperatures in the image are higher than the top scale value.

Raise the value of the top scale/alarm values.

7.9.1 Current FevIR Cam Location

The FevIR Cam location field allows the user to enter text to identify the system’s

locations to the operators and in any stored imagery. The text appears at the top

left corner of the screen window.

7.9.2 Units

The Units radio button selects the displayed units between Celsius (Centigrade) and

Fahrenheit.


7.9.3 Layout

The Layout control allows the user to present the screen in a number of predefined

formats. The side by side format is mainly illustrated throughout this manual.

However, a PIP (picture in picture) arrangement allows the IR picture to be displayed

larger with a smaller inset visual image.

In PIP mode different layouts can be selected to suit the installation from the drop-

down list to the right of the selection ICON.

7.9.4 Colour Palette

The Palette drop down allows users to select from one of a number of both

Monochrome and Colour pre-defined palettes.

7.9.5 Temperature Labels

The Temperature Labels control enables the temperature numeric annotation on the

IR image to be turned off.

All selections made will be retained after exiting the program and will be re-loaded

when the program is re-started.


7.10 The Scanning Tab

The Scanning tab allows the target properties and Scanning area to be adjusted. Target (Calibration Reference Source) emissivity and background temperatures are

used to define the reference values that are incorporated in Thermoteknix

proprietary algorithms which adjust the FevIR Cam sensitivity and internal calibration

to register against the measured value of the Calibration Reference Source to

achieve high accuracy absolute temperature measurement. Human skin has an

emissivity of around 0.98. The background temperature should be set to the ambient

temperature of the monitoring site locale. An accuracy within 2-3°C is sufficient.

7.10.1 Scanning Area

FevIR Cam enables the area of the screen in which subject monitoring and

application of pre-set alarm conditions are performed. The Scanning area should be

set to include only the region of interest for monitoring and any fixed hot objects

should be excluded. The blackbody temperature reference unit must NOT be

included within the Scanning area.

The monitored region can be any arbitrary rectangle, defined graphically by using

the mouse or by typing co-ordinates in the set-up menu. After it has been defined, it

can be dragged by using the mouse.


7.11 The Blackbody Temperature Reference Tab

The Reference tab refers to the Calibration Reference Source parameters. The

Calibration Reference Source temperature is typically set to 35.0°C (mid-range).

This tab does not change the settings of the Calibration Reference Source itself, this

must be done directly on the unit using the digital programmer on the side. Its value

must be entered onto this tab. When the FevIR Cam 2 system starts the software

monitors the temperature in reference marker area for stability and does not allow

alarm Scanning to be done until it is stable or if it should vary during operation.

The emissivity is a property of the instrument and should not be altered from the

value of 0.97. Background refers to the ambient temperature and an accuracy of

3°C - 4°C is sufficient.


7.11.1 Blackbody reference temperature Marker size and location

The marker is the location of the Calibration Reference Source seen by the infrared

the FevIR Cam within its field of view. This must be outside the general person

Scanning area that has or will be defined. The Calibration Reference Source

Scanning area is designated by a circular yellow area tool. This area measurement

tool must be placed over the central active area of the Calibration Reference Source

with the FevIR Cam aligned directly to view down the centre of the anti-reflection

metal tube. The circle should encompass the uniform area of the Calibration

Reference Source to enable the system to include those values in the calibration

algorithms. A minimum size of area of 20×20 pixels is required to conform with ISO

standard protocols. If this cannot be set within the Calibration Reference Source

uniform surface view, reduce the distance between the FevIR Cam and the

Calibration Reference Source.

The “Auto System Monitor” feature allows the user to select an automated check of

the system stability during normal operation. When the system detects poor

reference stability it will indicate this with an exclamation mark. (See page 23.)

Note that when first turned on both the Calibration Reference Source and the FevIR

Cam will have poor thermal stability as they warm up and hence the alarm condition

will be displayed for around 2 minutes.

Note: When the exclamation mark is showing the system measurement is inhibited and the

system is not available for Scanning.


7.12 The FevIR Cam Tab

This shows the unique serial number of the thermal the FevIR Cam. Please ensure

that this number is quoted in any correspondence or calls to Thermoteknix customer

support ([email protected])


7.13 Saved images

FevIR Cam saves images during an alarm condition according to the timer setting in the

alarm tab of the Setup dialog.

There is a small icon for viewing the saved image folder in Windows Explorer. And a

button for viewing the image. The operator can also view the image by double

clicking the thumbnail.

The images are saved with date and time specific file names. Images older than 12

months will be automatically deleted by the system to conserve disk space. Any

images that must be kept need to be archived before they become older than a year.

Archived images restored to the system should not be restored to the FevIR Cam

directory or the system will detect that they are older than a year and delete them

again. If the operator sees an interesting image they want to keep they can press F4

or select “Save Image” from the menu and the system will immediately save an

image regardless of any other settings.


8 Fault Finding

If the thermal image is uniform without any image texture or definition the

likelihood is that the scale setting is incorrect. If the image is uniformly black it may

be that the low span is set too high, i.e. all the measured temperatures are lower

than the low span setting. The reverse may be true if the image is white: the high

temperature may be set too low. If the image is all red, increase the Alarm threshold

temperature.

8.1 Temperature measurement The FevIR Cam must be directed to view the oncoming subjects while keeping the

Calibration Reference Source in view. The image can be displayed full screen by

pressing F11. FevIR Cam measures skin surface temperature. The eye inner orbit

(socket) has the greatest correlation with core temperature closely followed by

forehead temperature. The forehead temperature however is more likely to be

affected by other non-fever related effects, such as stress, sweating, exercise, raised

ambient temperature, and many other environmental and physiological conditions.

Glass and plastic are opaque in the infrared wavelength so thermal imaging cannot

“see” through them. All people approaching the Scanning location must be asked to

remove their glasses and hats prior to entering the monitoring area. This will allow

measurement of their inner eye orbital temperature and provide accurate

measurements.

Typical normal core temperatures measured orally are 36.8°C (although please see

later the discussion on body temperature variation.)

For convenience, otic (ear cavity) temperature is often cited as the core

temperature as this is readily measured in the ear using a specialised, easily

obtainable ear thermometer.

Otic temperatures can be quickly and hygienically measured: 37.6°C is the mean

normal otic measurement. The corresponding eye orbit temperature is 36°C but,

please note, there is a range of temperatures considered normal in disease-free

people.


Post-processed graphic to illustrate position of inner aspect of eye orbit (spot 1) and

facial temperature distribution. (Tools not available in FevIR Cam)

The FevIR Cam software now needs to be setup so that the system knows the position

of the Calibration Reference Source.

With the Calibration Reference Source unit in direct view of the FevIR Cam, at a

distance of between 1 and 3m, Move the Calibration Reference Source identifying

tool so that the tool outline is directly within the circular uniform image.

The Calibration Reference Source temperature should be set to 35.0°C on its

controller.

The Calibration Reference Source tool value in FevIR Cam software Setup Menu (F7)

must be set to the same temperature setting as the Calibration Reference Source

controller value.

FevIR Cam software will monitor the stability and uniformity of the Calibration

Reference Source and will indicate a green circle at the top of the screen when the

system is ready for use. It will be calibrated to deliver accurate skin surface

temperature measurements.


8.1.1 Setup the Alarm Threshold value

Next an appropriate alarm threshold should be entered. Selecting an appropriate

value threshold is not an exact science because of the variability and range of human

skin temperature and ambient conditions. Too high a threshold and a feverish person

may not trigger an alarm. If the threshold is set too low then the system will trigger

on subjects with normal temperatures and not a raised skin temperature.

The objective is to set the threshold so that almost all subjects with abnormal

temperatures that might indicate the presence of a fever are detected. This will

inevitably generate a number of false alarms but these can be quickly discounted

using a quick otic temperature measurement. A threshold of 37°C could be usefully

selected as a starting threshold but adjusted according to local conditions.

When an alarm is triggered a red circle is overlaid on the screen to indicate the

position of the pixels that actuate the alarm. This will identify the subjects who

need secondary testing with an approved clinical thermometer. As temperatures

approach the alarm threshold it is sometimes possible for alarm activity shown by red

pixels to appear at a number of different locations.

Rather than displaying a multitude of red alarm circles FevIR Cam Software uses

integral proprietary algorithms to assess active alarm conditions for a locale within

the image and draws a red circle of appropriate radius. This enables the operator to

assess the severity of the alarm threshold condition more accurately.


8.2 Shortcuts Here is a list of shortcuts to help you use FevIR Cam Software more quickly:

Shortcut Action

F2 Toggles the system menu

F4 Save an image

F6 Toggles the “Enter Password” dialog

F7 Display the Setup dialog box, putting up the Password

dialog first if necessary.

F11 Toggles the full screen mode

Esc An alternative to F11 for exiting full screen mode.


9 Skin temperature measurement The detector in the thermal imager is sensitive to infrared radiation. Everything

radiates infrared according to natural laws and in proportion to temperature and

emissivity. The emissivity is a measure of a body's radiation efficiency and is strongly

influenced by surface texture. The detector measures the radiation after it has

passed through the atmosphere and the IR the FevIR Cam’s objective lens. Both of

these attenuate the signal and affect the efficiency of detecting the radiation. This

affects the system's ability to measure temperature remotely.

Your thermal imager is based on the latest microbolometer technology. All thermal

imagers in this class exhibit a degree of “pixel to pixel drift”. This must be corrected

using an internal paddle with an even (uniform) temperature which is situated in

front of the detector. This is referred to as “Non Uniformity Correction” or “NUC”.

Periodically the uniform paddle, which is at a known temperature, is moved into its

calibration position in front of the detector for a second or two and the image will

freeze during this period. No thermal imaging will take place while this occurs. The

data obtained during the NUC operation is used to correct for non-uniformities

caused by thermal drift due to the warming of components inside the FevIR Cam and

substantially improves the image quality and is essential for accurate temperature

measurement. You may notice that periodically the image freezes and you may hear

a clicking sound. This is the NUC process operating automatically. When the imager

is first turned on the NUC process is frequent but as the imager approaches thermal

equilibrium after 20 or 30 minutes then the period between NUCs extends.

The Calibration Reference Source supplied with the FevIR Cam system has a known

emissivity and temperature setting. This is then used to remove calibration

uncertainties and inaccuracies to provide excellent temperature measurement

capabilities.

The emissivity of human skin has little person to person variation and is not affected

by skin colour. The same is not true for variations in core body temperature either

from one person to another or indeed for the same person at different times of the

day or month or in different environmental conditions. Normal personal body

temperature can vary by up to 2°C over the circadian rhythm and skin temperatures

can vary by 8 or 10°C.

Febrile conditions lead to an elevated core temperature but the extent of this

elevation on the skin, if any, may not correlate with the severity of the fever.

Furthermore, elevated core temperature in one person may correspond to normal

body temperature in another. It should also be noted that cosmetics affect skin

temperature measurement as does sweating which both lower the measured

temperature value.


Accordingly, non-contact thermography using an infrared the FevIR Cam and FevIR

Cam cannot guarantee that subjects detected with raised skin temperatures will

have a fever (raised internal body/core temperature) nor that subjects with a fever

will have a raised internal body/core temperature.

This means that the system is a tool for remotely sensing surface skin temperature.

It is not a medical instrument and it is not a diagnostic tool for identifying the

presence or incubation of any disease. Operators should use FevIR Cam as an aid for

selecting people for additional monitoring where febrile conditions can be diagnosed

by a person qualified to do so.


10 Labelling The FevIR Scan system is present on both the FevIR camera and the Calibration

reference source. The labels should not be removed or obscured by any customer

labelling. (Examples below)


11 Software installation You have purchased a turnkey system and the laptop should have the FevIR Cam

software pre-installed. If you need to re-install, or to install the software on another

computer you will need to use the supplied USB memory stick.

11.1 Installing FevIR Cam software Insert the Thermoteknix memory stick provided with the system into a USB port on

the PC.

Navigate to the root of the drive and double-click “Setup.exe”.

The installer will now start and the usual installer dialogs will allow you to direct

where the software should be installed.

It is not necessary to have the FevIR Cams connected during software installation.

Firstly you will be asked for your preferred language:

And then welcomed


The setup types are listed with the most expected options first.

If you select the Custom installation, this menu will appear:

If you press the “Change…” button on the destination folder window:


then this menu will appear:

The software is now ready to install or cancel:

When installed, you can install shortcuts to start the software:


The installer will report the processor detected:

On successful installation of the underlying the FevIR Cam software, this window will

appear:

The FevIR Cam software presents its own success report:

and its own licence agreement.


The installer will add a desktop icon and a menu item for you to access the software.


It is also possible to modify or remove the software at a later date.


12 Disposal

The FevIR Scan system does not contain hazardous substances or exhibit any medical

bio hazards during normal operation.

Disposal and recycling of the electronic components contained within the system can

be a carried out in accordance with the Waste Electrical and Electronic Equipment

(WEEE) Recycling Regulations.

The PC may contain images of individuals and should be disposed of in accordance

with local guidance and regulations regarding privacy (Such as GDPR within EU). In

many jurisdictions you will need to have certified evidence that the data contained

on the hard disk has been disposed of in accordance with these regulations.


13 Support:

This product is supported according to the terms of your purchase agreement.

To raise a support issue please contact Thermoteknix by email at

[email protected].

A member of our support team will contact you.

mailto:[email protected]


Thermoteknix Systems Ltd.

Teknix House

2 Pembroke Avenue, Waterbeach

Cambridge CB25 9QR

United Kingdom

Telephone: +44 (0) 1223 204000

Fax: +44 (0) 1223 204010

Email: [email protected]

Web: www.thermoteknix.com

mailto:[email protected]

http://www.thermoteknix.com/


All possible care has been taken in the preparation of this publication, but

Thermoteknix Systems Ltd. accepts no liability for any inaccuracies that may be

found.

Thermoteknix Systems Ltd. reserves the right to make changes without notice both

to this publication and to the product it describes.

No part of this publication may be reproduced, stored in a retrieval system or

transmitted in any form or by any means electronic, mechanical, photocopying,

recording or otherwise without the prior written permission of the copyright owner.

FevIR™ is a trademark of Thermoteknix Systems Ltd.

Thermoteknix FevIR is not subject to US ITAR control.

However it may require a UK export licence as provided by BIS regulations

depending on the end-user country and specification.

fevir scan2 skin temperature measurement systemg... · 2020. 5. 22. · these guidelines are in...

Documents