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  • Title: Intensity-demodulated fiber-ring laser sensor system for acoustic emission detection.
    Author: Han M, Liu T, Hu L, Zhang Q.
    Journal: Opt Express; 2013 Dec 02; 21(24):29269-76. PubMed ID: 24514479.
    Abstract:
    We theoretically and experimentally demonstrate a fiber-optic ultrasonic sensor system based on a fiber-ring laser whose cavity consisting of a regular fiber Bragg grating (FBG) and a tunable optical band-pass filter (TOBPF). The FBG is the sensing element and the TOBPF is used to set the lasing wavelength at a point on the spectral slope of the FBG. The ultrasonic signal is detected by the variations of the laser output intensity in response to the cold-cavity loss modulations from the ultrasonically-induced FBG spectral shift. The system demonstrated here has a simple structure and low cost, making it attractive for acoustic emission detection in structure health monitoring.
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