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Stabilized dual-wavelength fiber-optic interferometer for vibration measurement

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Abstract

A stabilized fiber-optic interferometer was developed for vibration measurement by using two laser diodes of different wavelengths and one polarization-maintaining fiber. Passive signal processing of two signals in quadrature is used to obtain the vibration amplitude with a resolution of approximately 0.1 nm. An extension of the signal-processing scheme is proposed that provides compensation for bending or temperature-induced transmission losses of the two propagation modes of the fiber.

© 1991 Optical Society of America

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