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Proceedings Paper

High-frequency ultrasound measurement using fiber grating laser hydrophone
Author(s): Li-Yang Shao; Sien-Ting Lau; Xinyong Dong; Yong-Jun Wang; Shun-Yee Liu; Hwa-Yaw Tam; Helen Lai-Wa Chan; Chao Lu
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Paper 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.

Paper Details

Date Published: 11 November 2008
PDF: 6 pages
Proc. SPIE 7134, Passive Components and Fiber-based Devices V, 71343U (11 November 2008); doi: 10.1117/12.802861
Show Author Affiliations
Li-Yang Shao, The Hong Kong Polytechnic Univ. (Hong Kong, China)
China Jiliang Univ. (China)
Sien-Ting Lau, The Hong Kong Polytechnic Univ. (Hong Kong China)
Xinyong Dong, China Jiliang Univ. (China)
Yong-Jun Wang, The Hong Kong Polytechnic Univ. (Hong Kong China)
Shun-Yee Liu, The Hong Kong Polytechnic Univ. (Hong Kong China)
Hwa-Yaw Tam, The Hong Kong Polytechnic Univ. (Hong Kong China)
Helen Lai-Wa Chan, The Hong Kong Polytechnic Univ. (Hong Kong China)
Chao Lu, The Hong Kong Polytechnic Univ. (Hong Kong China)


Published in SPIE Proceedings Vol. 7134:
Passive Components and Fiber-based Devices V
Ming-Jun Li; Ping Shum; Ian H. White; Xingkun Wu, Editor(s)

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