Self-exciting optical strain gage

Details Self-exciting optical strain gage Self-exciting optical strain gage

1992-08-03

1994-05-10

Chilcot, Jr., Richard E.

Measuring and testing

Dynamometers

Responsive to force

73800, 356 355, G01L 110

Patent

active

053097726

ABSTRACT:
A self-exciting optical strain sensor (20) includes dual parallel bridges (22,24) having parallel facing surfaces (32,34). Light energy (38) entering a Fabry-Perot cavity (36) formed by this surfaces (32,34) induces a periodic buildup and release of energy in the cavity (36) which is directly related to the natural resonant frequency of the bridges (22,24). Analysis of the intensity of light emitted (50) from the cavity (36) determines the bridge natural frequency.

REFERENCES:
patent: 4777358 (1988-10-01), Nelson
patent: 4815855 (1989-03-01), Dixon
patent: 4912990 (1990-04-01), Norling
patent: 4970903 (1990-11-01), Hanson
patent: 5101664 (1992-04-01), Hockaday et al.

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