Fiber optic interferometric strain gauge assembly using an inten

Optics: measuring and testing – Material strain analysis – By light interference detector

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356345, 356352, G01B 902

Patent

active

059092734

ABSTRACT:
A fiber optic interferometric strain gauge assembly includes a sensor element (1) in the form of a length of single mode optical fiber whose ends (1a) and (1b) have a peak reflectivity not exceeding 10%. This reflectivity is provided either by semi-transparent coating on the fiber ends or by the establishment of Bragg gratings within the fiber length. A laser source (2) provides a beam which is coupled into the element (1) as one arm of an interferometer. The light reflected in the interferometer whose intensity varies depending upon the degree of strain applied to the element (1) is detected and separated out into samples corresponding to the frequency of the laser source and to twice the frequency of the laser source with the two values being processed to provide both the magnitude of strain and the direction of strain in the element (1).

REFERENCES:
patent: 5297437 (1994-03-01), Schneider
patent: 5564832 (1996-10-01), Ball et al.
"Fiberoptic sensors measure up for smart structures", Friebele et al, Laser Focus World, May 1994, pp. 165-169.
McGraw Hill Encyclopedia of Science & Technology, 6th edition, pp. 293.

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