Fiber Bragg grating chemical sensor

Gerald Meltz; William W. Morey; James R. Dunphy

doi:10.1117/12.56526

1 March 1992 Fiber Bragg grating chemical sensor

Gerald Meltz, William W. Morey, James R. Dunphy

Proceedings Volume 1587, Chemical, Biochemical, and Environmental Fiber Sensors III; (1992) https://doi.org/10.1117/12.56526
Event: OE Fiber, 1991, Boston, MA, United States

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.

Citation Download Citation

Gerald Meltz, William W. Morey, and James R. Dunphy "Fiber Bragg grating chemical sensor", Proc. SPIE 1587, Chemical, Biochemical, and Environmental Fiber Sensors III, (1 March 1992); https://doi.org/10.1117/12.56526

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