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Proceedings Paper

A fiber-optic hydrophone with a cylindrical Helmholtz resonator
Author(s): Zefeng Wang; Yongming Hu; Ming Ni; Zhou Meng; Hong Luo
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Paper Abstract

A passive homodyne Michelson interferometric fiber-optic hydrophone with a single-hole cylindrical Helmholtz resonator has been manufactured. To validate the theoretical results that the fluid coefficient of viscosity has great influence on the maximum sensitivity at the resonant frequency, the acoustic sensitivity frequency response of the fiber-optic hydrophone has been measured in a standing-wave tank filled with castor oil. The viscosity coefficient of castor oil will change with the variation of the temperature. Experimental Results show that the fiber-optic hydrophone frequency responses of different temperature have identical form except that the maximum sensitivities are different. The acoustic sensitivities of low frequency are about -159dB re 1rad/μPa. While the maximum sensitivities near the measured resonant frequency of 800Hz go down with the fall of the temperature, i.e. with the increase of the viscosity coefficient, which is agree with the theoretical conclusions. This fiber-optic hydrophone is a prototype device for a class of sensors that used to eliminate aliasing in the future sonar systems.

Paper Details

Date Published: 21 November 2007
PDF: 6 pages
Proc. SPIE 6781, Passive Components and Fiber-based Devices IV, 678107 (21 November 2007); doi: 10.1117/12.742735
Show Author Affiliations
Zefeng Wang, National Univ. of Defense Technology (China)
Yongming Hu, National Univ. of Defense Technology (China)
Ming Ni, National Univ. of Defense Technology (China)
Zhou Meng, National Univ. of Defense Technology (China)
Hong Luo, National Univ. of Defense Technology (China)

Published in SPIE Proceedings Vol. 6781:
Passive Components and Fiber-based Devices IV
Ming-Jun Li; Jianping Chen; Satoki Kawanishi; Ian H. White, Editor(s)

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