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  2. 'Bright and reliable': These motion-sensor solar security ...

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  3. Motion detector - Wikipedia

    en.wikipedia.org/wiki/Motion_detector

    A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.

  4. Passive infrared sensor - Wikipedia

    en.wikipedia.org/wiki/Passive_infrared_sensor

    A PIR motion detector used to control an outdoor, automatic light. A camera trap with PIR motion detector. An indoor light switch equipped with PIR-based occupancy sensor [1] A PIR-based motion detector is used to sense movement of people, animals, or other objects. They are commonly used in burglar alarms and automatically activated lighting ...

  5. Contoocook Railroad Bridge - Wikipedia

    en.wikipedia.org/wiki/Contoocook_Railroad_Bridge

    The bridge underwent slight alterations being completed mid-winter 2009-2010 which consisted of a dry-head, open pipe sprinkler system for the bridge interior with exterior fire department connection, including linear heat detectors, fire alarm system, fire retardant coating and LED motion sensor lighting inside the bridge at an approximate ...

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  7. Photoelectric sensor - Wikipedia

    en.wikipedia.org/wiki/Photoelectric_sensor

    A photoelectric sensor is a device used to determine the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver. They are largely used in industrial manufacturing. There are three different useful types: opposed (through-beam), retro-reflective, and proximity-sensing (diffused).