Optical measurement system
First Claim
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.
1 Assignment
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Accused Products
Abstract
An optical measurement system for eliminating the influences of time variations on light sources, transmission lines, photo detectors, etc. The system includes light sources which generate two pulse-shaped optical signals of different light wavelengths with a portion of the optical signals being transmitted to a measuring part in a distant place by a transmission line. In the measuring part, a change of a measured object is converted into a variation in the quantity of transmission of light, and the optical signal subjected to the variation is transmitted to a signal processing portion by a transmission line. The varied optical signal is converted into a first electric signal by a photo detector. Another portion of the optical signals from the light sources is converted into a second electric signal by another photo detector. A signal processing circuit provides a measurement output indicative of the quantity of change of the measured object as a function of at least one ratio of the first and second electric signals.
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Citations
8 Claims
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1. An optical measurement system comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification