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The Use of Optocouplers in Measuring Loudspeaker Cone
The Use of Optocouplers in Measuring Loudspeaker Cone

... unit, two photo-interrupters in a differential connection have been used, together with the accompanying electronic circuitry. The linearity of the sensor achieved by this design is very good, particularly for large cone displacements and low frequencies (basically all the way down to 0Hz), suggesti ...
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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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