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Proceedings Paper

Demodulation system for fiber optic Bragg grating dynamic pressure sensing
Author(s): John D. Lekki; Grigory Adamovsky; Bertram Floyd
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Paper Abstract

Fiber optic Bragg gratings have been used for years to measure quasi-static phenomena. In aircraft engine applications there is a need to measure dynamic signals such as variable pressures. In order to monitor these pressures a detection system with broad dynamic range is needed. This paper describes an interferometric demodulator that was developed and optimized for this particular application. The signal to noise ratio was maximized through temporal coherence analysis. The demodulator was incorporated in a laboratory system that simulates conditions to be measured. Several pressure sensor configurations incorporating a fiber optic Bragg grating were also explored. The results of the experiments are reported in this paper.

Paper Details

Date Published: 6 August 2001
PDF: 9 pages
Proc. SPIE 4328, Smart Structures and Materials 2001: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (6 August 2001); doi: 10.1117/12.435517
Show Author Affiliations
John D. Lekki, NASA Glenn Research Ctr. (United States)
Grigory Adamovsky, NASA Glenn Research Ctr. (United States)
Bertram Floyd, Akima Inc. (United States)


Published in SPIE Proceedings Vol. 4328:
Smart Structures and Materials 2001: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials
Eric Udd; Daniele Inaudi, Editor(s)

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