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Sensitivity Compensation Method for Hydrophones with Different Scales in Vibrating Liquid Column Tube |
XIE Jianyu,WANG Yuebing,ZHAO Peng,ZHANG Kai,WANG Mingwei |
Key Laboratory of In-situ Measurement of Ministry of Education, China Jiliang University, Hangzhou, Zhejiang 310018, China |
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Abstract A sound field model in the tube was established using COMSOL simulation software for different scales of spherical and cylindrical hydrophones. The interference of different scales of hydrophones on the sound field was analyzed, and the pressure sensitivity of different scales of hydrophones was compensated and corrected accordingly. The hydrophones of different scale were calibrated using a vibrating liquid column calibration device in the frequency band of 100~1000Hz, and the comparison results with the compensated hydrophone sensitivity value indicated that the size of the hydrophone affects the distribution of the surrounding sound field, resulting in uneven distribution of the sound field in the tube. When the size of the sensitive element is close to the inner diameter of the acoustic tube, the interference of the cylindrical hydrophones in the very low frequency band is close to 2.28dB, and the interference in the high frequency band is up to 5dB. And the cylindrical hydrophone of the same size had greater interference to the sound field than the spherical hydrophone. The sensitivity uncertainty of the hydrophone after compensation is within 0.52dB, which meets the requirements of the calibration of the vibrating liquid column method.
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Received: 16 February 2023
Published: 03 April 2024
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