Self-referencing interferometric fiber optic sensor system havin

Details Self-referencing interferometric fiber optic sensor system havin Self-referencing interferometric fiber optic sensor system havin

1998-04-14

2000-01-11

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356357, G01B 902

Patent

active

060142154

ABSTRACT:
A fiber optic sensor system comprises an optical fiber, a first reflector and a second reflector. The first reflector provides a fixed reference for measuring the optical path length between the second reflector and a reference reflector. The first and second reflectors respectively receive first and second portions of light emitted by the optical fiber and then reflect the light back to the optical fiber. The optical path length between the first and second reflectors varies in accordance with a sensed parameter. In operation, first and second interferograms are acquired that are produced by the interference of light reflected from the first and second reflectors with light reflected from a reference reflector. The first and second interferograms are then used to determine an optical path length between first and second reflectors. Finally, the optical path length between the first and second reflectors is used to determine the value of the sensed parameter.

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