photodetector

Photosensors or photodetectors are sensors of light or other electromagnetic energy. There are several varieties: Most optical detectors are 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 intensityPhotovoltaic cells or solar cells which produce a voltage and supply an electric current when illuminatedPhotodiodes which can operate in photovoltaic mode or photoconductive modePhotomultiplier 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 and in general behaves as a photoresistor.Phototransistors incorporating one of the above sensing methodsOptical detectors that are effectively thermometers, responding purely to the heating effect of the incoming radiation, such as pyroelectric detectors, Golay cells, thermocouples and thermistors, but the latter two are much less sensitive.Cryogenic detectors are sufficiently sensitive to measure the energy of single x-ray, visible and near infra-red photons (Enss 2005).
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A transducer capable of accepting an optical signal and producing an electrical signal containing the same information as in the optical signal. [2196] Note: The two main types of semiconductor photodetectors are the photodiode (PD) and the avalanche photodiode (APD).

photodetector
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RIVELATORE FOTOELETTRICO. SENSORE DI LUCE

Eng: photodetector
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