Fiber-optic strain gauge with attached ends and unattached micro

Details Fiber-optic strain gauge with attached ends and unattached micro Fiber-optic strain gauge with attached ends and unattached micro

1990-08-23

1992-07-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73800, H01J 516

Patent

active

051325292

ABSTRACT:
A strain gauge is made of an optical fiber into which quasi-sinusoidal microbends have been permanently introduced. The permanent microbends cause a reduction in the fiber's optical transmission, but, when the gauge is attached to a substrate that is subsequently strained, the amplitude of the deformations will diminish and the optical transmission through the fiber will increase. An apparatus and process for manufacturing these microbends into the optical fiber through a heat-set process is employed; this apparatus and process includes a testing and calibration system.

REFERENCES:
patent: 4163397 (1979-08-01), Harmer
patent: 4191470 (1980-03-01), Butter
patent: 4734577 (1988-03-01), Szuchy
patent: 4860586 (1989-08-01), Miers et al.
patent: 4915473 (1990-04-01), Haese et al.
J. Fields et al., "Fiber Optic Pressure Sensor", Journal Acoustical Society of America, vol. 67, No. 3, Mar. 1980, pp. 816-818.
J. Fields et al., "Fiber Microbend Acoustic Sensor", Applied Optics, vol. 19, No. 19, Oct. 1, 1980, pp. 3265-3267.
F. de Fornel et al., "Microbending Effects on Monomode Light Propagation in Multimode Fibers", Journal Optic Society of America, vol. 73, No. 5, May 1983, pp. 661-668.

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