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<p>This paper presents a novel pressure coupling chamber for calibrating hydrophones in the frequency range from a few Hz to 1–2&#xa0;kHz. The design uses an array of loudspeakers and a microphone as projectors and a reference sensor, respectively, acoustically coupled through a medium inside the chamber. The projectors are mounted on the chamber walls around the hydrophone's sensitive element to create a homogeneous acoustic field. The chamber's acoustic length is nearly half that of existing designs, significantly extending the high-frequency calibration range. The paper outlines the calibration setup and procedure, validating the new design through comparisons of B&amp;K 8104 and B&amp;K 8106 hydrophone calibrations. The results are consistent with data from the international project “Underwater Acoustic Calibration Standards for Frequencies Below 1&#xa0;kHz” (15RPT02 UNAC-LOW), supported by EURAMET.</p>

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Pressure Coupling Chamber for Comparison Calibration of Hydrophones at Frequencies from a Few Hz Up to 1–2 kHz

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月25日

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  • Alper Biber,
  • Ata Can Corakci,
  • Oleksandr Golyk

摘要

This paper presents a novel pressure coupling chamber for calibrating hydrophones in the frequency range from a few Hz to 1–2 kHz. The design uses an array of loudspeakers and a microphone as projectors and a reference sensor, respectively, acoustically coupled through a medium inside the chamber. The projectors are mounted on the chamber walls around the hydrophone's sensitive element to create a homogeneous acoustic field. The chamber's acoustic length is nearly half that of existing designs, significantly extending the high-frequency calibration range. The paper outlines the calibration setup and procedure, validating the new design through comparisons of B&K 8104 and B&K 8106 hydrophone calibrations. The results are consistent with data from the international project “Underwater Acoustic Calibration Standards for Frequencies Below 1 kHz” (15RPT02 UNAC-LOW), supported by EURAMET.