alexander galt regional high school science secondary 3 september 6, 2008 slide 1 senses, sensors,...

Alexander Galt Regional High School Science Secondary 3September 6, 2008

Slide 1

Senses, Sensors, Sensory


Slide 2

HUMAN SENSESVision, hearing, smell, taste, touch

Each of the human senses is specialized to obtain data that is sent to the brain.

The brain does the interpretation of the information. Sometimes the brain works in strange ways. Some people see colors when hearing music.


Slide 3

Vision, hearing, smell, taste, touch

Human senses help detect changeHow they enhance our ability to detect change

They give us different informationTake one or two senses away and the world

becomes a very different place.

Each of our senses need a certain amount of energy to work properly Light must be a certain brightness to see Sound must be loud enough to hear The pressure on our skin must be great enough to feel. The skin must be

sensitive enough to detect the difference in temperature--hot or cold.


Slide 4

HUMAN SENSES

Human senses with technology

Lenses/Sight

Stethoscope/hearing

Novint Falcon Game Controler

da Vinci® Surgical System

Microscope


Slide 5

SensorsAre devices capable of detecting change:

TemperaturePressureHumiditySpeedAnd Many more …

Motion sensors

Temperature sensors


Slide 6

Sensors

Sensors used for various applications


Slide 7

Sensors

Sensors used in many careers and in games.


Slide 8

HUMAN VISION – The most used

Human Eye can see only a small part of the

Electromagnetic Spectrum called Visible Light


Slide 9

VISION TESTS – It is related to your chromosomes –


Slide 10

“VISION” SENSORS

Night vision goggles – creates images in the infra-red range

X-ray machines – creates images with the very short x-ray wavelengths

There are environmental parameters that are important to our welfare and survival that cannot be sensed by the human vision

An example: radioactivity, UV exposure, etc.


Slide 11

SOUND SENSORS

Importance: human hearing is limited

Microphones can detect sound at extremely low volumes

Ultrasound devices detect sounds at very high frequencies

CommunicationWhales, bats, submarines


Slide 12

SMELL SENSORSHuman smell is limited to a certain number of chemical compounds in the air

Electronic NosesAir quality (NASA project, industry – medical)Foods (fish, fruit, etc.)Wines

Smoke detectors

There are environmental parameters that are important to our welfare and survival that cannot be sensed by the human senses examples:

carbon monoxide, radon, etc.


Slide 13

TASTE RECEPTORS

There are four tastes that can be recognized by the tongue: sweet, sour, bitter, and salty.

Most of what we experience as taste is actually from our sense of smell.Particular scents and tastes are due to different molecules that bind to smell and taste receptors. Our smell receptors can recognize thousands of different scent molecules.


Slide 14

TASTE SENSORS

Human taste requires direct contact with the compoundTaste sensor

Example: Electronic tongue can distinguish wines.

Water quality (sensors that sample the water) -pollution, bacteria, etc.Fish freshness

Females have more taste buds than males Taste is the weakest of the five senses


Slide 15

FEELING SENSORS

Humans skin can detect change in temperature

relative to the environment, pain, pressure, rough and smooth, soft and hard, and wet and dry.

A new artificial arm that is connectedto the nervous system and the personcan feel an object.


Slide 16

FEEL SENSORS

Sensors relating to - pressure, temperature and gravityThermometers, wind speed, motion detectors, etc.

Magnetic field sensorsSome birds and fish can sense the earth’s magnetic field, humans seem unable to (we use compasses)

Electric Fields sensorsSharks and eels seem to be able to, humans cannot (electrometers)


Slide 17

SENSES AND SENSORSThere are inventions or devices that can extend the human physical senses of sight, hearing, taste, smell, touch (pressure, temperature and gravity). We use these to gain information about our planet and far beyond.

To appreciate the role of sensors by considering them as an extension of human senses. Sensors sense the same phenomena as human senses, but:

They are there 365 days a year and 24 hours a day They can be sent where it is impossible to send humansTheir measurements are more precise (sensitive & selective)Their measurements are reproducible


Slide 18

SENSORS IN EVERYDAY LIFE

AutomobilesCell PhonesRemote ControlsTraffic LightsAppliances (stove, refrigerator, furnace, thermometer)Motion SensorsSmoke DetectorsGas Detectors


Slide 19

Questions?What type of sensors could you use in the careers that youare considering for the future?

What type of sensors are in your home?

What type of sensors are in your car?

What extra type of sensor would you like to have in your body?

Sensory: It means relating to sensation , to the perception of a stimulus and the voyage made by incoming ( afferent ) nerve impulses from the sense organs to the brain. Sensory nerves are nerves dealing with senses.

alexander galt regional high school science secondary 3 september 6, 2008 slide 1 senses, sensors,...

Documents

sensory slide

sensors sensors

human senses human senses

visible light slide

human vision

human senses vision

smell sensors human

human hearing