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Optical measurement system

  • US 4,260,883 A
  • Filed: 02/14/1979
  • Issued: 04/07/1981
  • Est. Priority Date: 02/15/1978
  • Status: Expired due to Term
First Claim
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1. An optical measurement system comprising:

  • (a) optical signal source means for generating first and second pulse-shaped optical signals of different wavelengths,(b) an optical differential means for converting the physical change of a measured object into a displacement and for differentially varying the quantities of different wavelengths,(c) first and second photodetector means for converting the output lights of said optical signal source means and said optical differential means into input electric signals, respectively,(d) optical transmission lines coupling said optical signal source means and said optical differential means, and for coupling said optical differential means and said second photodetector means, respectively, and(e) a signal processing circuit means for a measurement output indicative of the physical change of the measured object as a function of the output electric signals of said first and second photodetector means for the first optical signal and an output ratio of said output electric signals of said first and second photodetector means for the second optical signal.

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