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Fiber optic displacement sensor employing a graded index lens

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Abstract

A novel intensity modulated fiber optic displacement sensor based on the relative motion of an optical fiber and a graded index lens is described. The technique allows the use of either single- or multimode optical fibers in either single or dual fiber configurations. Displacement sensitivities of 25 Å have been measured using 50-μm core diam multimode fibers, with a light emitting diode source. Theoretical sensitivities of the order of 0.01 nm are predicted with the use of single-mode fibers.

© 1990 Optical Society of America

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