Photodetectors, also called photosensors, are devices that detect light or other forms of and convert it into an electrical signal. This review summarizes recent research progress in optically coupled photodetectors, providing a systematic analysis of the operational mechanisms and performance characteristics of five key coupling configurations: optical waveguides, surface plasmon resonance structures . Usually, the quantity being detected is the optical power, which is related to the rate of incoming photons. A Photoelectric Sensor consists primarily of an Emitter for emitting light and a Receiver for receiving light. OMRON provides many varieties of Sensor, including diffuse-reflective, through-beam, retro-reflective, and distance-settable Sensors, as well as Sensors with either built-in or separate amplifiers and Fiber Units.
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