3 February 1999 Simultaneous measurement of fiber strain and temperature using a two-mode fiber acousto-optic scanning interferometer
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Abstract
We have utilized a traveling acoustic pulse in a two-mode optical fiber to create a moving beam splitter to couple light from LP01 to LP11 mode. As these optical modes have different group velocities, a variable intermodal delay is generated as a function acoustic pulse position in the fiber. The device can be used in low-coherence interferometry to scan time delay for making fast extended range absolute measurement using simple analog electronic circuits. With this scanning technique we demonstrate measurement of absolute strain over 1600 (mu) (epsilon) in the temperature range 20-60 degrees C with resolutions of the order of 40 (mu) (epsilon) and 0.7 degrees C, respectively, employing highly birefringent fibers as sensing elements.
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Pranay G. Sinha, Pranay G. Sinha, Toshihiko T. Yoshino, Toshihiko T. Yoshino, } "Simultaneous measurement of fiber strain and temperature using a two-mode fiber acousto-optic scanning interferometer", Proc. SPIE 3541, Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII, (3 February 1999); doi: 10.1117/12.339077; https://doi.org/10.1117/12.339077
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