Use in science laboratories Optical chopper

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typical experimental setup


optical choppers, rotating disc mechanical shutters, used in science labs in combination lock-in amplifiers. chopper used modulate intensity of light beam, , lock-in amplifier used improve signal-to-noise ratio.


to effective, optical chopper should have stable rotating speed. in cases 1/f noise main problem, 1 select maximum chopping frequency possible. limited motor speed , number of slots in rotating disc, in turn limited disc radius , beam diameter.








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