1. College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China
2. Nanjing Metrology Research Center, PipeChina West East Gas Pipeline Company, Nanjing, Jiangsu 210046, China
Abstract Aiming at the lack of a method for calibrating the sensitivity of hydrophones under variable temperature conditions, a temperature-variable hydrophone sensitivity calibration system based on the sound tube of the moving coil transducer was designed. A model was established to analyze the sound pressure distribution in the sound tube, and the compensation amount for the sensitivity calibration result after changing temperature was calculated; Comsol was used to simulate the influence of different sound tube thicknesses on the sound field, and the non-uniform vibration of the bottom surface and the effect of different sizes of hydrophones on the calibration were analyzed. Influence of the results, the appropriate acoustic tube size and measurement method were determined. The hydrophones of different sizes were calibrated under normal and variable temperature conditions and the calibration results were compared with the standard values. The results show that the deviation of the calibration result of this system from the standard value is less than 0.5dB at normal temperature, and the deviation of the measurement result from the standard value under the condition of variable temperature is less than 0.6dB, and the expanded uncertainty of the whole system is about 1.0dB.
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2023, Vol. 44 
