High Frequency Ultrasound Measurement using Fiber Grating Laser Hydrophone

摘要：

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.

关键词： fiber grating laser fiber optical sensor ultrasonic hydrophone time-domain ultrasonic signal

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

作者单位: Photonics Research Centre,Department of Electrical Engineering,The Hong Kong PolytechnicUniversity,H Department of Applied Physics,The Hong Kong Polytechnic University,Hong Kong College of Optical & Electronic Technology,China Jiliang University,Hangzhou,China Photonics Research Centre,Department of Electrical Engineering,The Hong Kong PolytechnicUniversity,H Photonics Research Centre,Department of Electronic and Information Engineering,The Hong Kong Polytec

会议类型: 国际会议

会议名称: 2008亚太光通信会议(Asia-Pacific Optical Communications 2008)

会议地点: 杭州

会议语种:英文

在线出版日期: 2008-10-26（万方平台首次上网日期，不代表论文的发表时间）