Which Type of Fire Detecting Device Measures Changes in Infrared

question 21

Multiple Choice

Which type of fire detecting device measures changes in infrared energy that is radiated by smoke?

• A) Thermal expansion detectors
• B) Ionization sensors
• C) Radiation sensors
• D) Photoelectric fire sensors
• E) Infrared detectors

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Definitions:

Neural Messages

Electrical and chemical signals transmitted by neurons in the nervous system to communicate information.

Lens

A curved piece of glass or other transparent material that focuses or disperses light rays, used in glasses and cameras.

Fovea

The central focal point in the retina of the eye, around which the cones are densely packed for high visual acuity.

Retina

A layer at the back of the eyeball containing cells that are sensitive to light and trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.