Abstract
We demonstrate a frequency-multiplexed three-channel fiber-optic interferometric dc and low-frequency voltage sensor based on the electrostrictive effect in lead magnesium niobate transducers. The sensor relies on the nonlinear transduction mechanism in electrostrictive materials for frequency-division multiplexing by use of a single interferometer and a single unmodulated laser. To our knowledge this is the first direct measurement of three low-frequency voltage signals with a single fiber-optic interferometer. Demonstrated cross talk between channels is less than −75 dB. The cross talk is shown to be caused by the nonlinear output of the interferometer at large applied strains.
© 1994 Optical Society of America
Full Article | PDF ArticleMore Like This
S. T. Vohra, F. Bucholtz, and A. D. Kersey
Opt. Lett. 16(18) 1445-1447 (1991)
S. T. Vohra and F. Bucholtz
Opt. Lett. 17(5) 372-374 (1992)
D. M. Dagenais and F. Bucholtz
Opt. Lett. 19(21) 1699-1701 (1994)