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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)


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 languageEnglish
Pages (from-to)2714-2718
Number of pages5
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Issue number12
Publication statusPublished - 1 Dec 2008

ASJC Scopus subject areas

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering


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