Abstract

A white-light interferometric extrinsic Fabry–Perot strain sensor that uses a multimode fiber is demonstrated. The Fabry–Perot cavity length is measured with the help of a Fizeau interferometer. The sensor is described, and some results obtained at this time are given. The strain measurements are absolute and perfectly linear, with a sensitivity of 0.25 micrometers per meter (μ). The design of a thermally autocompensated strain sensor is also presented.

© 1993 Optical Society of America

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