Method and apparatus for sensing strain

Details Method and apparatus for sensing strain Method and apparatus for sensing strain

1988-06-20

1990-05-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502311, 73800, 356 32, H01J 516, G01D 534

Patent

active

049280040

ABSTRACT:
The present invention pertains to a strain sensor. The strain sensor is comprised of an optical waveguide, a device for providing optical pulses to the optical waveguide 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. In a preferred embodiment the sensing device includes a device for reflecting a portion of the optical pulses at predetermined positions in the optical waveguide and a device for detecting the shift in arrival times of the portion of the optical pulses which are reflected.

REFERENCES:
patent: 4477725 (1984-10-01), Asawa et al.
patent: 4654520 (1987-03-01), Griffiths
patent: 4713538 (1987-12-01), Theocharous
patent: 4734577 (1988-03-01), Szuchy
patent: 4778248 (1988-10-01), Arzur et al.
patent: 4806012 (1989-02-01), Meltz et al.
patent: 4815810 (1989-03-01), Betzler et al.
Barnoski et al., "Optical Time Domain Reflectometer," Applied Optics, vol. 16, No. 9, 9/77, pp. 2375-2379.
Wearden, "The Optical Time Domain Reflectometer," Int. Fiber Optics, vol. 2, No. 2, 3/81, pp. 41-44.

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