Fiber optic fabry-perot sensor for measuring absolute strain

Details Fiber optic fabry-perot sensor for measuring absolute strain Fiber optic fabry-perot sensor for measuring absolute strain

1997-11-17

2000-05-02

Kim, Robert H.

Optics: measuring and testing

Material strain analysis

By light interference detector

356351, 356352, G01B 902

Patent

active

060579110

ABSTRACT:
Absolute strain is measured by providing a coherent beam of light and separating the coherent beam of light into first and second beams which are in quadrature with one another and which have different polarization angles. The first and second beams are combined in a manner which maintains the different polarization angles thereof, so as to form a combined beam. The combined beam is then applied to a Fabry-Perot strain sensor so as to form a reflected combined beam. The reflected combined beam is then separated into first and second reflected beams having different polarization angles. The intensity of the first and second reflected beams is then sensed, so as to determine a change in the etalon length of the Fabry-Perot sensor. The change in etalon length is indicative of the absolute strain sensed.

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