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Title: High frequency ultrasound measurement using fiber grating laser hydrophone
Authors: Shao, LY
Lau, ST
Dong, X
Wang, YJ
Liu, SY
Tam, HY 
Chan, HLW 
Lu, C 
Keywords: Fiber grating laser
Fiber optical sensor
Time-domain ultrasonic signal
Ultrasonic hydrophone
Issue Date: 2008
Publisher: SPIE-International Society for Optical Engineering
Source: Proceedings of SPIE : the International Society for Optical Engineering, 2008, v. 7134, 71343U (CD) How to cite?
Journal: Proceedings of SPIE : the International Society for Optical Engineering 
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.
Description: Passive Components and Fiber-based Devices V, Hangzhou, 27-30 October 2008
ISSN: 0277-786X
EISSN: 1996-756X
DOI: 10.1117/12.802861
Appears in Collections:Conference Paper

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