Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/33729
Title: Characterization of a 40-MHz focused transducer with a fiber grating laser hydrophone
Authors: Lau, ST
Shao, LY
Chan, HLW 
Tam, HY 
Hu, CH
Kim, HH
Liu, R
Zhou, Q
Shung, KK
Issue Date: 2008
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 2008, v. 55, no. 12, p. 2714-2718 How to cite?
Journal: IEEE transactions on ultrasonics, ferroelectrics, and frequency control 
Abstract: A novel fiber-optic hydrophone based on a dualpolarization, short-cavity fiber grating laser as the sensing element is described. Wet chemical etching was used to fabricate a thinned fiber sensor to extend its frequency response as well as spatial resolution. The lateral beam profile at the focal plane of a 40-MHz lens-focused lithium niobate (LiNbO3) transducer was measured with the fiber sensor, and a tomographic technique was used to compute the transducer profile, which is compared with that obtained by a PVDF hydrophone. The fiber hydrophone has a sensitivity of approximately-259 dB re 1V/μPa up to 40 MHz, which is higher than that of a commercial PVDF hydrophone. Moreover, it is capable of accurately characterizing the beam generated by high-frequency transducer.
URI: http://hdl.handle.net/10397/33729
ISSN: 0885-3010
EISSN: 1525-8955
DOI: 10.1109/TUFFC.2008.987
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