Microbend fiber optic strain gauge

Details Microbend fiber optic strain gauge Microbend fiber optic strain gauge

G - Physics

01

N

73/53

G01N 21/84 (2006.01) G01B 11/16 (2006.01) G01L 1/24 (2006.01)

Patent

CA 1299389

ABSTRACT OF THE DISCLOSURE A microbend strain gauge comprises a pair of plates having facing offset corrugations which clamp a signal optical fiber therebetween, The optical fiber is coated and a light signal is supplied to one end of the fiber which is read at an opposite end of the fiber by an optical sensor. Modulations in the light are primarily due to a difference in pressure being applied to the fiber by the plates, A second optical fiber, the reference fiber, which is near the signal optical fiber, is subjected to the same thermal condition and its light signal compared to the light, signal through the signal optical fiber to offset any temperature error introduced into the signal by changes in temperature. Aluminum, polyimide or gold coating increases temperature resistance for the fibers.

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