High-frequency ultrasound measurement using fiber grating laser hydrophone

Li-Yang Shao; Sien-Ting Lau; Xinyong Dong; Yong-Jun Wang; Shun-Yee Liu; Hwa-Yaw Tam; Helen Lai-Wa Chan; Chao Lu

doi:10.1117/12.802861

11 November 2008 High-frequency ultrasound measurement using fiber grating laser hydrophone

Li-Yang Shao, Sien-Ting Lau, Xinyong Dong, Yong-Jun Wang, Shun-Yee Liu, Hwa-Yaw Tam, Helen Lai-Wa Chan, Chao Lu

Proceedings Volume 7134, Passive Components and Fiber-based Devices V; 71343U (2008) https://doi.org/10.1117/12.802861
Event: Asia-Pacific Optical Communications, 2008, Hangzhou, China

Abstract

A fiber laser hydrophone system for measuring tone-burst ultrasonic signals up to 40 MHz is developed. The hydrophone consists of a cladding-etched dual polarization distributed Bragg reflector (DBR) fiber laser. The sensing mechanism is based on the modulation of the fiber laser's birefringence induced by the ultrasonic pressure. The ultrasonic signal waveform is demodulated using an FM-DEM (frequency modulation-demodulation) circuit and measured with a digital oscilloscope. Incorporating the time delay measurement of ultrasonic signal, this fiber laser hydrophone system achieves a spatial resolution of 37.5 μm at 40 MHz.

Citation Download Citation

Li-Yang Shao, Sien-Ting Lau, Xinyong Dong, Yong-Jun Wang, Shun-Yee Liu, Hwa-Yaw Tam, Helen Lai-Wa Chan, and Chao Lu "High-frequency ultrasound measurement using fiber grating laser hydrophone", Proc. SPIE 7134, Passive Components and Fiber-based Devices V, 71343U (11 November 2008); https://doi.org/10.1117/12.802861

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