Fiber optic strain gauge patch

Details Fiber optic strain gauge patch Fiber optic strain gauge patch

1995-11-03

1997-07-15

Bovernick, Rodney B.

Optical waveguides

Optical waveguide sensor

Including physical deformation or movement of waveguide

356 32, 356345, 25022714, 73800, G02B 600, G01B 1116, G01L 124

Patent

active

056490356

ABSTRACT:
A fiber optic sensor for measuring strain on and within structures. The sensor includes an optical fiber, two reflective markers, and two thin layers of carrier material. The optical fiber is looped multiple times within the two thin layers of the carrier material. The optical signal circulates multiple times through the sensing region, as it is travels through the multiple loops of optical fiber within the carrier layers. The fiber optic sensor can be embedded within a structure, as that structure is being fabricated, or it can be attached onto a preexisting structure. An optical signal generated from a source such as a laser is input into one end of the optical fiber. The signal is reflected at reflective markers at predetermined positions in the optical fiber. The time delay of the signals received back is then analyzed to calculate the strain in the structure.

REFERENCES:
patent: 4928004 (1990-05-01), Zimmermann et al.
patent: 4947693 (1990-08-01), Szuchy et al.
patent: 5094527 (1992-03-01), Martin
patent: 5189299 (1993-02-01), Zimmermann et al.
patent: 5201015 (1993-04-01), von Bieren et al.
patent: 5399854 (1995-03-01), Dunphy et al.
patent: 5488475 (1996-01-01), Friebele et al.

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