Characterization of a 40-MHz focused transducer with a fiber grating laser hydrophone

Sien Ting Lau; Li Yang Shao; Helen Lai Wa Chan; Hwa Yaw Tam; Chang Hong Hu; Hyung Ham Kim; Ruibin Liu; Qifa Zhou; K. Kirk Shung

doi:10.1109/TUFFC.2008.987

Characterization of a 40-MHz focused transducer with a fiber grating laser hydrophone

Sien Ting Lau, Li Yang Shao, Helen Lai Wa Chan, Hwa Yaw Tam, Chang Hong Hu, Hyung Ham Kim, Ruibin Liu, Qifa Zhou, K. Kirk Shung

The Hong Kong Polytechnic University

Research output: Journal article publication › Journal article › Academic research › peer-review

8 Citations (Scopus)

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.

Original language	English
Pages (from-to)	2714-2718
Number of pages	5
Journal	IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume	55
Issue number	12
DOIs	https://doi.org/10.1109/TUFFC.2008.987
Publication status	Published - 1 Dec 2008

ASJC Scopus subject areas

Instrumentation
Acoustics and Ultrasonics
Electrical and Electronic Engineering

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10.1109/TUFFC.2008.987

Cite this

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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.",

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AU - Lau, Sien Ting

AU - Shao, Li Yang

AU - Chan, Helen Lai Wa

AU - Tam, Hwa Yaw

AU - Hu, Chang Hong

AU - Kim, Hyung Ham

AU - Liu, Ruibin

AU - Zhou, Qifa

AU - Shung, K. Kirk

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Characterization of a 40-MHz focused transducer with a fiber grating laser hydrophone

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