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Proceedings Paper

Fiber Bragg grating chemical sensor
Author(s): Gerald Meltz; William W. Morey; James R. Dunphy
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Paper Abstract

A new fiber-optic method for quasi-distributed remote chemical sensing is described. The technique is based on using a wavelength selective Bragg-grating radiation coupler for localized excitation and detection of fluorescent species on or near the surface of the fiber cladding. A grating can be formed in germanosilicate fiber by exposing the core, through the side of the cladding, to an ultraviolet, two-beam interference pattern. With a suitable choice of index modulation, the grating can be designed to couple light efficiently from a guided mode into a narrow radiation beam. The index perturbation also enhances the capture of the emitted luminescence. Since the gratings are blazed to optimize the coupling efficiency for a desired wavelength band, each sensing region can be designed for a specific measurement. An array of identical sensors can be sampled by optical time domaifl reflectometry.

Paper Details

Date Published: 1 March 1992
PDF: 12 pages
Proc. SPIE 1587, Chemical, Biochemical, and Environmental Fiber Sensors III, (1 March 1992); doi: 10.1117/12.56526
Show Author Affiliations
Gerald Meltz, United Technologies Research Ctr. (United States)
William W. Morey, United Technologies Research Ctr. (United States)
James R. Dunphy, United Technologies Research Ctr. (United States)

Published in SPIE Proceedings Vol. 1587:
Chemical, Biochemical, and Environmental Fiber Sensors III

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