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Proceedings Paper

Temperature-insensitive ultrasonic sensor system based on a fiber ring laser for acoustic emission detection
Author(s): Tongqing Liu; Guigen Liu; Lingling Hu; Ming Han
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Paper Abstract

We develop a novel ultrasonic sensor system using a fiber ring laser (FRL) to detect acoustic emissions. The sensor system incorporates two fiber Bragg gratings (FBGs) in the FRL cavity, a short and strong FBG as the sensing element and a long and weak FBG as the adapting element. The reflection spectra of both FBGs are matched such that the reflection peak of the long FBG is positioned at the linear slope of the short FBG’s reflection spectrum. Ultrasonic waves impinging onto the FBGs are to modulate the FRL cavity loss, which leads to laser intensity variations that can be detected directly by photodetectors. The two FBGs are placed side-by-side in close proximity so that the sensor system is able to adapt to the ambient temperature drift. We demonstrate that the ultrasonic sensor system can operate normally within approximately 15ºC temperature change. In addition, the performance of signal-to-noise ratios is investigated as a function of the FRL cavity loss. The proposed temperature-insensitive sensor system is attractive in practical applications where temperature change is unavoidable.

Paper Details

Date Published: 18 June 2014
PDF: 6 pages
Proc. SPIE 9098, Fiber Optic Sensors and Applications XI, 90981A (18 June 2014); doi: 10.1117/12.2069940
Show Author Affiliations
Tongqing Liu, Univ. of Nebraska-Lincoln (United States)
Guigen Liu, Univ. of Nebraska-Lincoln (United States)
Lingling Hu, Univ. of Nebraska-Lincoln (United States)
Ming Han, Univ. of Nebraska-Lincoln (United States)


Published in SPIE Proceedings Vol. 9098:
Fiber Optic Sensors and Applications XI
Henry H. Du; Gary Pickrell; Eric Udd; Christopher S. Baldwin; Jerry J. Benterou; Anbo Wang, Editor(s)

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