一种变温环境下水听器灵敏度校准系统的设计

针对缺少在变温条件下校准水听器灵敏度方法的问题,设计了一套基于动圈换能器声管的变温水听器灵敏度校准系统。建立模型分析声管内的声压分布,并计算了变温后对灵敏度校准结果的补偿量;利用Comsol仿真不同声管厚度对声场的影响,分析了底面非均匀振动和不同尺寸的水听器对校准结果的影响,确定了合适的声管尺寸和测量方法。分别在常温与变温条件下对不同尺寸的水听器进行校准并将校准结果与标准值比较。结果表明,此系统在常温下的校准结果与标准值的偏差低于0.5 dB,变温条件下的测量结果与标准值偏差低于0.6 dB,整体系统的扩展不确定度约为1.0 dB。

Design of a Hydrophone Sensitivity Calibration System in Variable Temperature Environment

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.