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An Optical Fiber Strainmeter and Test of its Stability

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Abstract

We have built two optical fiber strainmeters at our research facilities in southern California: one in the lab and another at Piñon Flat Geophysical Observatory. Using single mode optical fiber which is clamped at both ends, we measure strain of the fiber inter-ferometrically. To interpret these results, the temperature coefficient and strain coefficient of the refractive index of fibers under tension have been determined. We have also carried out stability experiments on the fibers over long periods of time (months to years). Direct comparison with a conventional evacuated-path Michelson interferometer establishes the merits and relative quality of an optical fiber strainmeter.

© 1988 Optical Society of America

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