摘要A novel mechanical anti-aliasing filtering fibre-optic hydrophone with a cylindrical Helmholtz resonator is constructed and tested. The experimental results show that the hydrophone has a function of low-pass filtering. The low frequency acoustic sensitivity is about -160dB (1radμPa), and the response curve has a resonance determined by the Helmholtz resonator. Theoretical and experimental results both show that the resonant frequency moves towards high frequency with the increasing orifice diameters. The sensitivity attenuation of high frequency is larger than 10dB. This new fibre-optic hydrophone is a prototype device for a class of sensors used to eliminate the aliasing in future sonar systems.
Abstract：A novel mechanical anti-aliasing filtering fibre-optic hydrophone with a cylindrical Helmholtz resonator is constructed and tested. The experimental results show that the hydrophone has a function of low-pass filtering. The low frequency acoustic sensitivity is about -160dB (1radμPa), and the response curve has a resonance determined by the Helmholtz resonator. Theoretical and experimental results both show that the resonant frequency moves towards high frequency with the increasing orifice diameters. The sensitivity attenuation of high frequency is larger than 10dB. This new fibre-optic hydrophone is a prototype device for a class of sensors used to eliminate the aliasing in future sonar systems.
WANG Ze-Feng;HUNG Yong-Ming;MENG Zhou;NI Ming. Experimental Investigation on a Fibre-Optic Hydrophone with a Cylindrical Helmholtz Resonator[J]. 中国物理快报, 2008, 25(5): 1606-1608.
WANG Ze-Feng, HUNG Yong-Ming, MENG Zhou, NI Ming. Experimental Investigation on a Fibre-Optic Hydrophone with a Cylindrical Helmholtz Resonator. Chin. Phys. Lett., 2008, 25(5): 1606-1608.
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