Demodulation system for fiber optic Bragg grating dynamic pressure sensing

John D. Lekki; Grigory Adamovsky; Bertram Floyd

doi:10.1117/12.435517

6 August 2001 Demodulation system for fiber optic Bragg grating dynamic pressure sensing

John D. Lekki, Grigory Adamovsky, Bertram Floyd

Proceedings Volume 4328, Smart Structures and Materials 2001: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials; (2001) https://doi.org/10.1117/12.435517
Event: SPIE's 8th Annual International Symposium on Smart Structures and Materials, 2001, Newport Beach, CA, United States

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.

Citation Download Citation

John D. Lekki, Grigory Adamovsky, and Bertram Floyd "Demodulation system for fiber optic Bragg grating dynamic pressure sensing", Proc. SPIE 4328, Smart Structures and Materials 2001: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (6 August 2001); https://doi.org/10.1117/12.435517

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