Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-05-22
1993-02-23
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356 731, H01J 516, G01N 2100
Patent
active
051892995
ABSTRACT:
The present invention pertains to a strain sensor. The strain sensor is comprised of an optical wave guide, a device for providing optical pulses to the optical wave guide and a device for sensing localized strain in the optical waveguide. The sensing device determines shifts in arrival times of the optical pulses at the sensing device that correspond to the localized strain. The apparatus includes a light source, a light detector, and a waveguide connecting the source with the detector. The apparatus also includes means for generating light pulses from the source through the waveguide and means for repeatedly propagating at least one of the light pulses in a closed loop. The light source detects arrival times of the light pulses.
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Barnoski, et al., "Optical Time Domain Reflectometer", Applied Optics vol. 16, No. 9, Sep. 1977, pp. 2375-2379.
Claus Richard O.
Kapp David A.
Murphy Kent A.
Zimmermann Bernd D.
Center For Innovative Technology
Messinger Michael
Nelms David C.
Virginia Polytechnic Institute & State University
Virginia Tech Intellectual Properties Inc.
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