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The application ofelectromagnetic waves

prepared by :kethisvaaraanchew yien ting

siti hanisahwoo wan lin

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The infrared radiation

1.Infrared radiation is invisible radiant heat energy

2. Source of infrared radiation :

Hot object (stars and flame)

The objectsbelow 500C emit infrared rays only.

The object above500C emit infrared raysand red light.

3. Characteristic of infrared radiation :

Heating effect can be felt on the skin when it is exposed to infraredrays.

Can be detected by heat-sensitive photographic films and infraredsensors.

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the invisible radiant heat energy

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3.The applications of infrared radiation

For cooking- ovens, grills and toaster

Infrared lamps to dry paint on cars

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Night vision goggles

1.Night vision is optical instruments that

allows one to see in the dark.

2.3 Type of night vision goggle

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a. PASSIVE NIGHT-VISSION GOGGLES

- Characteristic :Pick up any light in the given area and amplify it

several thousands time.

The light detected will collide with a detector plate

and the metal ejects several electrons that areamplified into a cascade of electron that light up a

phosphor screen.

- Application :War reporting

tinting the picture green

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b. ACTIVE NIGHT-VISSION GOGGLES- Characteristic :

Infrared light are the same type used by a remote

control.

Produce an image from the light reflected back.

These goggle may require an image enhancer toamplify the light.

- Application :

Digital camera

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c. Heat-sensing / infrared goggles

- Characteristic :

Shows emits normal heat radiation the given area.

Special photographic films are sensitive to infrared

light can take pictures in dark without a flash light.

- Application :

Taking photographs in the dark

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The end