Information About Photoelectric Switches

What is photoelectric switch?

Switches, used mainly for situations such as sentry devices or outside lights. The generation of electricity by the photovoltaic cell when light is present.

how does it work and what is it used for?

1. A light beam, like a Laser in a bank security system, shines from the source (Laser) to a photoelectric cell on the other side of the room. When the beam is broken (stepped through), the light is stopped and the photoelectric cell activates a switch, which sets off an alarm. 2. Outdoor lights sometimes have photocells. These photocells sense when it is day (light) and night (dark). When it is dark enough they switch on the light automatically. The photocells inside the switches usually work on the principal of changing resistance with light intensity. These are photoresistive cells. Cadmium sulphide is the most common chemical used, that is photoresistive. You can Google "photocell" and "Cadmium Sulphide" for more details. Sometimes the photocell is a photovoltaic cell. These are like Solar panels that produce electricity. When light hits the tiny photocell, it produces a small amount of electricity which is amplified to activate the switch inside the photoelectric switch. More items… Can you submit more information?

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20th Jan 2015

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