Photodetector
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High Quality Content by WIKIPEDIA articles! Photosensors or photodetectors are sensors of light or other electromagnetic energy. There are several varieties:Optical detectors, which are mostly quantum devices in which an individual photon produces a discrete effect.Chemical detectors, such as photographic plates, in which a silver halide molecule is split into an atom of metallic silver and a halogen atom. The photographic developer causes adjacent molecules to split similarly.Photoresistors or Light Dependent Resistors (LDR) which change resistance according to light intensity.Photovoltaic ce...
High Quality Content by WIKIPEDIA articles! Photosensors or photodetectors are sensors of light or other electromagnetic energy. There are several varieties:Optical detectors, which are mostly quantum devices in which an individual photon produces a discrete effect.Chemical detectors, such as photographic plates, in which a silver halide molecule is split into an atom of metallic silver and a halogen atom. The photographic developer causes adjacent molecules to split similarly.Photoresistors or Light Dependent Resistors (LDR) which change resistance according to light intensity.Photovoltaic cells or solar cells which produce a voltage and supply an electric current when illuminated.Photodiodes which can operate in photovoltaic mode or photoconductive mode.Photomultiplier tubes containing a photocathode which emits electrons when illuminated, the electrons are then amplified by a chain of dynodes.Phototubes containing a photocathode which emits electrons when illuminated, such that the tube conducts a current proportional to the light intensity.Phototransistors, which act like amplifying photodiodes.
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