Jia Guanghui, Chen Yi, Tu Juan, Zhang Dong
Key Laboratory of Modern Acoustics (MOE), Nanjing University, Nanjing 210093, China.
Hangzhou Applied Acoustics Research Institute, Hangzhou 311400, China.
J Acoust Soc Am. 2024 Sep 1;156(3):1633-1645. doi: 10.1121/10.0028376.
A primary wideband calibration method for noise hydrophones is developed, which can be applied to obtain noise acoustic spectral density sensitivity in the free-field. In this method, a wideband three-transducer spherical wave reciprocity calibration method is proposed in the frequency domain. A lowpass spatial domain filter is utilized to eliminate the reflecting acoustic waves from boundaries and water surface, and the wideband frequency responses of the transducer pair are calculated. Wideband calibrations are performed in a laboratory anechoic water tank, and two hydrophones with different reference sensitivities are calibrated in the frequency range of 250 Hz to 20 kHz using noise signals. The decidecade band sensitivities are obtained by the primary wideband calibration, which is in agreement with the single frequency sensitivities. The expended uncertainty of the primary wideband calibration is analyzed and estimated to be 8.9% (k = 2).
开发了一种用于噪声水听器的宽带校准方法，该方法可用于获得自由场中的噪声声谱密度灵敏度。在该方法中，提出了一种频域宽带三换能器球面波互易校准方法。利用低通空间域滤波器消除来自边界和水面的反射声波，并计算换能器对的宽带频率响应。在实验室消声水箱中进行宽带校准，使用噪声信号在250 Hz至20 kHz的频率范围内对两个具有不同参考灵敏度的水听器进行校准。通过初级宽带校准获得了十倍频程带灵敏度，其与单频灵敏度一致。分析并估计了初级宽带校准的扩展不确定度为8.9%（k = 2）。
