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Chapter 5
Chapter 5

... A photoconductive film of n-type GaAs doped with 1013 cm−3 donors is 2 mm long (L), 1 mm wide (W), and 5 µm thick (D). The sample has electrodes attached to its ends (electrode area is therefore 1 mm × 5 µm) which are connected to a 1 V supply through an ammeter. The GaAs photoconductor is uniformly ...
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Opto-isolator



In electronics, an opto-isolator, also called an optocoupler, photocoupler, or optical isolator, is a component that transfers electrical signals between two isolated circuits by using light. Opto-isolators prevent high voltages from affecting the system receiving the signal. Commercially available opto-isolators withstand input-to-output voltages up to 10 kV and voltage transients with speeds up to 10 kV/μs.A common type of opto-isolator consists of an LED and a phototransistor in the same opaque package. Other types of source-sensor combinations include LED-photodiode, LED-LASCR, and lamp-photoresistor pairs. Usually opto-isolators transfer digital (on-off) signals, but some techniques allow them to be used with analog signals.
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