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Fabry-Perot FISO Sensors

Presented by: Régis Blin, Technical Sales

Web Seminar

• You should hear my voice through your PC speaker / headset

• This webinar will last approx. 30 minutes.• You can ask questions using the “Questions”

panel on the right of your screen. We will answer:- In the “Questions” Panel- At the end of the presentation- By email

• Later this week you will receivelinks to:- Presentation in PowerPoint- Video recording of Webinar

Contents

Fabry Perot sensors:Introduction to FISOPrincipleApplicationsSensorsReading unitsConclusion

FISO Technologies

FISO Technologies Inc.

Smartec sister company

Founded in 1994 1999 Acquired by Roctest Group

Independent subsidiary

Based in Quebec City 2000 m2 production area

ISO Certified ISO 9001:2008

ISO 13485:2003 (Medical)

100 m2 Class 10 000 Clean Room

Clean Room

Plasma Enhanced Deposition System

Anodic Bonder

Automated Production

• Immune to EMI, RF, Lightning Strikes, High Voltage, Intense Magnetic Field,…

• Intrinsically Safe• Long term reliability (no corrosion)• Temperature independent (no T compensation)• Low power loss / up to 4 km long distance• Small size and light weight• Low cost

Key advantage of FISO system

• Point sensors for pressure, strain, deformation, temperature, refractive index

• Long-terms stability• High resolution• Small size, packaging for geotechnical

instrumentation• Lowest cost for FOS

Fabry-Perot sensors

Fabry Perot sensing principle

• Measurement is achieved by measuring the Fabry-Perot cavity length using white light interferometry

Optical Fiber Mirrors

Fabry-Perot Cavityca. 1 cm

The phase between the two reflections depends on the strain and/or on the temperature on the sensor

Fabry Perot sensors

Y1, Y2 correspond to maxima of cross correlation function

Y2Y

1

FP cavity (Y2)

FP cavity (Y1) Y

Signal conditioner

Connector

Incident signal

Reflected signal

2x2 Coupler

Source

FP coded light

Lens

Optical cross correlatorCCD detector

Cross correlation

function

Pixel

Fiber optic

Sensor

FP Cavity

US Patents:5,202,939 & 5,392,117

FISO Technology

Fabry-Perot Sensor packaging

Applications

Monitoring: during construction and long-term

Parameters: Pressure: Piezometers (static and dynamic)TemperaturesStrong Motion recorder

Purpose: Insure safety of the dam, FOS selected for superior lightning protection, long lead cables, dynamic pressure sensing and long lifetime.

El-Mauro Tailings Dam - Chile

Fiber Routing Fiber Routing to Terminal to Terminal

HouseHouse

Cut-Off TrenchCut-Off Trench

Final Terminal Final Terminal HouseHouse

@ 1800 m@ 1800 m

230 230 mm

2500 2500 mm

Stage 1 Terminal Stage 1 Terminal House @ 1000 mHouse @ 1000 m

El-Mauro Tailings Dam, Duct track

Foundation DrillingsFoundation Drillings

Ducts for ConductorsDucts for Conductors

ManholesManholes Piezometers:Piezometers:SandSand

DrainsDrainsFoundationFoundation

Strain Protection isStrain Protection isCompulsory for Compulsory for

long term long term measurementsmeasurements

Objective:Objective:Stress Protected Stress Protected conductors and conductors and

instrumentsinstruments

El-Mauro Tailings Dam, Cable protection

Manhole and Manhole and Armoured DuctsArmoured Ducts

El-Mauro Tailings Dam, Cable ducts

Monitoring: understanding underground water movements

Parameters: Pore water pressure

Advantages: micro-PZ selected for small cross section, reduces borehole size, long lead cables and long lifetime.

Hydraulic tomography - USA

Hydraulic tomography - USA

Monitoring: continuous automatic monitoring from the construction to the operation

Parameters: Total Pressure Cell for stresses in soil

Purpose: fiber optical TPC selected for long lead cables and long lifetime.

Rotterdam Harbor - The Netherlands

Fabry-Perot Total Pressure Cell (lightning)

FOP-C sensor

Oil-filled pressure cell

Monitoring: continuous automatic monitoring

Parameters: Stresses in steel girders

Purpose: fiber optical strain gauges selected for long lead cables and long lifetime.

ESA VEGA Ground Segment SHM

ESA VEGA Ground Segment SHM

Monitoring: long-term

Parameters: Annular space monitoring

Vertical, Horizontal and Rotational Movements

Purpose: FOS selected for cryogenic environment, long lead cables and long lifetime.

LNG Tank, Huelva Storage - Spain

LNG Tank Annular Space

Huelva storage (Spain)

• Absolute measurement

• Linear response

• Range: 20 mm (0.79’’)

• Long leads lengths

• Easy to use

• Heavy duty and robust

• Reliable and promising long term stability

• Independent of light source stability

Monitoring: continuous automatic monitoring

Parameters: Displacement, strain, temperature

Purpose: fiber optical sensors selected for resistance to cryo, radiation, vacuum and strong magnetic fields.

Superconducting structures, ITER Magnets

Superconducting structures, ITER Magnets

FeedersCorrection Coils

Superconducting structures, ITER Magnets

FISO Pressure Sensors

Fabry-Perot Pressure sensors

Pyrex

Silicon Membrane

Fabry-Perot Cavityd0d0d0

P

d1

P1

d2

P2

d0

P0

• Intrinsically safe• Immune to EMI/RFI/Lightning• Long-term reliability• Accuracy of ±0.25% F.S.• High resolution• Rugged stainless steel construction for harsh environments

SPECIFICATIONS PERFORMANCE Range 200, 350, 500, 750, 1000, 1500, 2000, 3000, 5000, 7000 kPa Accuracy ± 0.25% F.S. Resolution 0.025% F.S. Overload 1.5 × F.S. MODEL FOP FOP-F FOP-C FOP-P Housing Slim Thick-wall Threaded Push-in point

(STD 1/4" 18 NPT) with EW thread Outside diameter 19 mm 25.4 mm 19 mm 33.4 mm Length 100 mm 100 mm 100 mm 210 mm Material Stainless steel Filter Stainless steel, ~50 μ m, ~10 kPa low air entry

Ceramic, ~1 μ m, ~450 kPa high air entry

Fabry-Perot Piezometers

The FOP-MicroPZ is a fiber optic piezometer used to measure pore-water (or other fluids) pressure. One of the main differentiator of the FOP-MicroPZ is its very small size, enabling it to be used where no other piezometers can. Moreover, the FOP-MicroPZ has similar or better performances than traditional piezometers.

Range 100, 200, 300 kPa Accuracy: ± 0.1 % F.S. Resolution: 0.025 % F.S.

FOP-MicroPZ

FISO Displacement sensors

Fabry-Perot Displacement Sensor

The FOD is an absolute position sensor. Its design is based on a Thin Film Fizeau Interferometer device (TFFI) mounted on a movable shaft.

Linear stroke: 20 mm Resolution: 0.002 mm Accuracy: ±0.02 mm -200°C to 100°C Aluminum, Stainless Steel.

Fabry-Perot Displacement Sensor

Fizeau (variable FP)Mirror

Optical fibre

Light outLight in

Displacement

Applications: Low frequency displacement measurements anywhere where an electric wire is forbidden, or where lightning strike too often.

Outside structures, Nuclear enclosure monitoring, Oil & Gas reservoir monitoring

Advantages:

Immune to EMI, to lightning strikes

Fabry-Perot Displacement Sensor

FISO Strain Sensors

Fabry-Perot Strain sensors

Fabry-Perot Cavity

dd0

Ɛ0

dt

Ɛt

dc

Ɛc

ƐCompression Tension

d0

dc

dt

Range: ±1000µε Up to ±5000µε

Resolution: 0.01% FS

Trans. Sensitivity: <0.1% FS

Operating temp.: -40°C to 85°C

Range: ±1000µε Up to ±10000µε

Resolution: 0.01% FS

Trans. Sensitivity: <0.1% FS

Operating temp.: -40°C to 250°C

Range: ±1000µε up to ±3000µε

Resolution: 0.01% FS

Trans. Sensitivity: <0.1% FS

Operating temp.: -40°C to 85°C

Fabry-Perot Strain Sensors

EFO

SFO-W

FOS-N

FISO Temperature Sensors

Fabry-Perot Temperature Sensors

Fiber with large CTE

Fiber with low CTE

Fabry-Perot Cavity

300 um

d

T

do

T0

dh

Th

dc

Tc

d0 dc

dh

Range: from -40°C to typ. +85°C (max. 300°C)

Response time: down to 750ms

Resolution typ. 0.1°C and min. 0.01°C

Accuracy ± 0.5°C

Fabry-Perot Temperature Sensors

FISO Signal Conditionners

FTI-10 DMI FPI-HR FPI-HS

Channel 1 16 or 32 1 or 2 1

Sequential Parallel

N/A Sequential Sequential Parallel Parallel

Max freq. 10 Hz 20 Hz

150ms-sw

250Hz (1ch)

125Hz (2ch)

15KHz

Analog output ±10V or

4-20mA

0 - 5V 0 - 5V

Power 12 VDC 12 VDC 24 VDC 24 VDC

WLFPI Signal Conditionners

FTI-10 Evolution platformDMI

• One channel• Voltage output and RS-232 communication ports• Backlit LCD screen• Small footprint (1/8 DIN)• Rugged and easy to use• Battery powered

Single-channel portable readout

• 16 to 32 channels• 50 000 samples data logger• Programmable data logger• NEMA-4 enclosure• Integrated modem for remote monitoring• LED indicators for FODL-1600/3200 status

16/32 channels readout

Robust table-top design

OEM module @ 250 Hz / 125 Hz per channel

1-2 Channels (parallel)

Fully protected OEM design

Small footprint (102 x 102 x 45 mm)

Smart connectors SCAI

DIN-rail snap-on

Analog +USB

Temperature compensation

FPI-HR1-2 channels

(250 Hz=125 Hz/channel)

FPI-HR Modules

The evolution reading unit is composed of an evolution platform, a usb / power transmission interface, and 2 FPI-HR modules of 2 channels each.

SCAI connector is a smart connector. On the sensor side a microchip containing the calibration factors is included.

The chip is read by the unit connector and data are automatically loaded into the software..

Evolution reading unit

The data are fully compatible with SMARTEC SDB Software for static data management, analysis and representation

4.2 [m/m]

Software integration

• Fabry-Perot sensors: point sensors for pressure, strain, deformation, temperature, refractive index

• Long-terms stability• High resolution• Small size, packaging for geotechnical

instrumentation• Lowest cost for FOS

Conclusions

Thank you for your attentionSMARTEC

http://www.smartec.ch/