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27 March 2019 Fiber-ring laser sensor system using a fiber Fabry-Pérot filter for ultrasound detection
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We propose and experimentally demonstrate a multiplexing methodology for ultrasonic sensors based on fiber Bragg gratings (FBGs) that are included in the laser cavity of a semiconductor optical amplifier (SOA)-based fiber-ring laser system coupled with a fiber Fabry-Pérot (FFP) filter. The fiber ring laser (FRL) consists of an SOA as a gain medium and of FBGs as wavelength selection elements. We experimentally fabricate a dual-wavelength fiber ring laser and confirm stable oscillation outputs of the laser source. And ultrasonic signals generated from the piezoelectric transducers (PZTs) source are successfully detected. Such a multiplexed fiber-optic ultrasonic sensor system may be used for acoustic emission (AE) detection for structural health monitoring (SHM).
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Liming Mao, Chuanyi Tao, Jingke Li, Xuhai Jiang, Junhua Cheng, and Jing Zhang "Fiber-ring laser sensor system using a fiber Fabry-Pérot filter for ultrasound detection", Proc. SPIE 10970, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019, 109702T (27 March 2019);

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