Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1981-09-10
1984-07-24
Lee, John D.
Optics: measuring and testing
Range or remote distance finding
With photodetection
73800, 350 9629, 356399, 367140, G02B 5172
Patent
active
044615361
ABSTRACT:
A transducer for the measurement of minute displacements incorporates a fiber optic coupler having a coupling efficiency which varies in relation to the relative position of coupler elements. The transducer may also be used indirectly as an accurate sensor of physical parameters, such as temperature and pressure, through the use of a secondary transducer which provides a displacement proportional to such physical parameter. The outputs from the fiber optic coupler may be compared to provide a measure of the coupling efficiency, and may be monitored by a display which provides a direct measurement of displacement or a secondary physical parameter.
REFERENCES:
patent: 4294513 (1981-10-01), Nelson et al.
patent: 4295738 (1981-10-01), Meltz et al.
patent: 4302071 (1981-11-01), Winzer
patent: 4307933 (1981-12-01), Palmer et al.
patent: 4315666 (1982-02-01), Hicks, Jr.
patent: 4360247 (1982-11-01), Beasley
patent: 4421384 (1983-12-01), McMahon
Digonnet Michel J. F.
Shaw Herbert J.
Board of Trustees of Leland Stanford Jr. University
Lee John D.
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