Microbending of optical fibers for remote force measurement

Details Microbending of optical fibers for remote force measurement Microbending of optical fibers for remote force measurement

G - Physics

01

L

73/3, 73/58

G01L 1/04 (2006.01) G01L 1/00 (2006.01) G01L 1/24 (2006.01) G01L 5/00 (2006.01)

Patent

CA 1183017

-1- MICROBENDING OF OPTICAL FIBERS FOR REMOTE FORCE MEASUREMENT ABSTRACT OF THE DISCLOSURE A system for remote measurement of structural forces includes a plurality of microbend transduc- ers mounted along the length of the structure for micro- bending an optical fiber in response to structural forces, such as stress acting upon an oil or gas pipeline or the like. An optical time domain reflectometer (OTDR) has a light source for launching a pulsed optical signal for passage through the fiber and a photodetector for sensing as a function of time the intensity of backscattered light reflected back through the fiber, wherein this sensed time function is correlated directly with discrete longitudinal positions along the length of the fiber and the structure. When one or more of the microbend transducers is activated to induce a microbend in the fiber in response to localized forces acting upon the structure, a portion of the backscattered light is lost at the microbend. This attenuation in backscattered light intensity is sensed quantitatively and positionally identified by the photodetector. Specific preferred constructions for microbend transducers and system arrangements particularly adapted for detecting structur- al strain in an oil or gas pipeline are disclosed.

410216

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