Prokhorov, A. M.; Claus, Richard O.; Popov, Andrey A.; Tulaikova, T. V. (Optical Society of America, 1997-08-01)
Fiber-optic chemical sensors based on optical power absorption or wavelength changes are well known. A new type of sensing element is considered. A micromechanical vibrated tiber-optic tip changes its resonance frequency during its operation. Sensors of this type are simple and convenient and do not require adjustment while in use. They are useful in industry and in medical applications. The action of this sensitive element in a liquid is considered. (C) 1997 Optical Society of America.
Li, Tianchu Li; May, Russell G.; Wang, Anbo; Claus, Richard O. (Optical Society of America, 1997-02-01)
We report an optical-scanning, dual-fiber, extrinsic Fabry-Perot interferometer system for absolute measurement of microdisplacement. The system involves two air-gapped Fabry-Perot cavities, formed by fiber end faces, functioning as sensing and reference elements. Taking the scanning wavelength as an interconverter to compare the gap length of the sensing head with the reference-cavity length yields the absolute measurement of the sensing-cavity length. The measurement is independent of the wavelength-scanning accuracy, and the reference-cavity length can be self-calibrated simply by one's changing the sensing-head length by an accurate value. (C) 1997 Optical Society of America.