photocell - ορισμός. Τι είναι το photocell
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Τι (ποιος) είναι photocell - ορισμός

SENSORS OF LIGHT OR OTHER ELECTROMAGNETIC ENERGY
Photocell; Optical detectors; Optical detector; Photodetectors; Photosensor; Photo cell; Photo detector; Photo sensor; Light-to-Digital Sensors; Light sensor; Light Sensors; Photosensors; Pixel sensor; Optical receiver; Photoelectric receiver; Image detector
  • A photodetector salvaged from a [[CD-ROM drive]]. The photodetector contains three [[photodiode]]s, visible in the photo (in center).

photocell         
¦ noun short for photoelectric cell.
Photodetector         
Photodetectors, also called photosensors, are sensors of light or other electromagnetic radiation. There is a wide variety of photodetectors which may be classified by mechanism of detection, such as photoelectric or photochemical effects, or by various performance metrics, such as spectral response.
Resistive opto-isolator         
  • A Doepfer A-101-2 Vactrol Low Pass Gate
  • Fender]] guitar amplifier with a tremolo effect
  • Idealized transfer function of an LED-based RO, i.e., dependence of the RO resistance on the LED current. Green band approximates fluctuations in resistance caused by memory effect at room temperature. Red band approximates effects of thermal drift and changes in optical coupling.<ref>Adapted from drawings in PerkinElmer (2001). ''[http://www.datasheetcatalog.org/datasheet/perkinelmer/VT500.pdf Photoconductive Cells and Analog Optoisolators (Vactrols®)]'', pp. 34 (response curve) 10, 12 (thermal drift), and idealized model in Silonex (2007). ''[https://web.archive.org/web/20100221155329/http://www1.silonex.com/audiohm/constants.html Audiohm Optocouplers: Audio Characteristics]''.</ref>
  • Approximation of a photoresistor.<ref>Adapted from Silonex (2007). ''[https://web.archive.org/web/20100221155329/http://www.silonex.com/audiohm/constants.html Audiohm Optocouplers: Audio Characteristics]'', figure 2.</ref>
  • Such metal-case Soviet ROs could be operated between −60 and 55 °C; nominal operating lifetime 2,000 hours due to the incandescent light source<ref name=bvs/>
  • p=323}}
  • p=6}}<ref group=notes>The original schematic had a common ground wire for audio and control networks. Here, grounds are split to demonstrate full galvanic isolation. The original Silonex circuit used dual supply rails to power OA2. If the inputs of OA2 allow rail-to-rail operation, it can powered with a single positive rail V<sub>cc</sub>, and the same rail can double as reference voltage (V<sub>ref</sub>=V<sub>cc</sub>). It need not be precisely regulated.</ref>
  • Series, shunt and series-shunt voltage dividers.<br />Series-shunt divider requires ''two'' drive signals (I<sub>C UP</sub> and I<sub>C DOWN</sub>).
  • Typical dependences of the coefficient of nonlinear distortions on the [[root mean square]] voltage across a PerkinElmer photoresistor.
  • pp=7–11, 29, 34}}
  • incandescent bulb]] (top), a [[neon lamp]] (middle) or a light-emitting diode (bottom).
  • Simplified circuit of a guitar amplifier modulator, employing a RO with an incandescent lamp by Gibson
  • RO-based memory cell, which assumes the "high" or "low" state after a brief commutation of the input tumbler from the middle to the upper or lower position.
OPTO-ISOLATOR WITH A PHOTO RESISTOR AS OPTICAL RECEIVER
Vactrol; Analog opto-isolator; Lamp-coupled photocell; Photoresistive opto-isolator
Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolatorIn PerkinElmer literature.

Βικιπαίδεια

Photodetector

Photodetectors, also called photosensors, are sensors of light or other electromagnetic radiation. There is a wide variety of photodetectors which may be classified by mechanism of detection, such as photoelectric or photochemical effects, or by various performance metrics, such as spectral response. Semiconductor-based photodetectors typically photo detector have a p–n junction that converts light photons into current. The absorbed photons make electron–hole pairs in the depletion region. Photodiodes and photo transistors are a few examples of photo detectors. Solar cells convert some of the light energy absorbed into electrical energy.