Electro-optical sensor

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Electro-optical sensors are electronic detectors that convert light, or a change in light, into an electronic signal. They are used in many industrial and consumer applications, for example:

Lamps that turn on automatically in response to darkness
Position sensors that activate when an object interrupts a light beam
Flash detection, to synchronize one photographic flash to another
Photoelectric sensors that detect the distance, absence, or presence of an object

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