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Reference.org
Electro-optical sensor
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<p>Electro-optical sensors are electronic detectors that convert <a href="/facts/Light/jeofpMn4">light</a>, or a change in light, into an electronic signal. These sensors are able to detect electromagnetic radiation from the infrared down to the ultraviolet wavelengths. They are used in many industrial and consumer applications, for example: </p> <ul><li><a href="/facts/Light_fixture/vjgU4z1f">Lamps</a> that turn on automatically in response to darkness</li> <li><a href="/facts/Position_sensor/qSNFA3CG">Position sensors</a> that activate when an object interrupts a light beam</li> <li>Flash detection, to synchronize one <a href="/facts/Photographic_flash/bfegk3Xy">photographic flash</a> to another</li> <li><a href="/facts/Photoelectric_sensor/Kvzf7YbQ">Photoelectric sensors</a> that detect the distance, absence, or presence of an object</li></ul>