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  2. Photoelectric sensor - Wikipedia

    en.wikipedia.org/wiki/Photoelectric_sensor

    Conceptual through-beam system to detect unauthorized access to a secure door. If the beam is interrupted, the detector triggers an alarm. 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 ...

  3. Twilight switch - Wikipedia

    en.wikipedia.org/wiki/Twilight_switch

    A twilight switch is an electronic component that allows the automatic activation of a lighting circuit when natural light drops in a given environment. Among a large number of uses, the most common is to enable automatic lighting of streets, roads, highways, roads, gardens, courtyards, etc., when sunlight drops below a certain level (e.g.: a ...

  4. Twilight Sentinel - Wikipedia

    en.wikipedia.org/wiki/Twilight_Sentinel

    The Twilight Sentinel system uses a photoelectric cell to measure ambient light levels. This cell is typically mounted on the dashboard of the vehicle. [7] The system is designed to activate the vehicle's exterior lights when the ambient light falls below a certain threshold, typically corresponding to twilight conditions.

  5. Photoresistor - Wikipedia

    en.wikipedia.org/wiki/Photoresistor

    Three photoresistors with scale in mm Large CdS photocell from a street light. A photoresistor is less light-sensitive than a photodiode or a phototransistor.The latter two components are true semiconductor devices, while a photoresistor is a passive component that does not have a PN-junction.

  6. Bulkhead - Wikipedia

    en.wikipedia.org/wiki/Bulkhead

    Bulkhead door, an angled door covering the exterior stairwell of a basement; Bulkhead flatcar, a type of rolling stock designed with sturdy end-walls to prevent loads from shifting past the ends of the car; Rear pressure bulkhead, an airtight structural feature of an aircraft

  7. Alec Baldwin Says He Will ‘Expose What Really Happened ...

    www.aol.com/alec-baldwin-says-expose-really...

    Despite the case being dismissed in July, Alec Baldwin says the story surrounding the fatal “Rust” shooting has only begun. On the Dec. 16 episode of David Duchovny’s “Fail Better ...

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