Infra-red sensor

Infra-red sensor

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Infra-red sensor for a burglar alarm. This device detects movement by sensing the change in infra- red radiation in the environment when a person walks into the room. It is a passive pyroelectric sensor. It is calibrated to infra-red radiation emitted at human body temperature. This radiation enters the device through the lens (red) that gives it a wide field of vision. The energy of the radiation will knock electrons out of the sensing material and trigger a cascade of electrons. This electronic pulse sets the alarm off. It will not detect someone standing still, as it will be set to respond only to changes in infra-red energy.

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Keywords: anti-crime, body temperature, burglar alarm, home, infra-red sensor, lens, motion, movement, movement detector, passive, protection, pyroelectric, security, sensitive, technology

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