矢量水听器低频绝对校准装置研究

提出了矢量水听器低频绝对校准装置。首先给出了矢量水听器绝对校准的原理,通过测量声源辐射面的加速度,利用驻波管中平面驻波声场中的声压、质点振速和质点加速度在垂直方向上的分布规律,得出了校准计算公式;之后对校准装置中平面驻波场在垂直方向上的分布规律进行了测量验证,并对测量用加速度计进行了校准;最后对待校矢量水听器的灵敏度和指向性进行了测试。结果表明:在10~315 Hz频带内,矢量水听器低频绝对校准装置在±1 d B误差允许范围内,可用于矢量水听器的绝对校准。

Research on low frequency absolute calibration apparatus of acoustic vector hydrophone

Low frequency absolute calibration apparatus of acoustic vector hydrophone is studied and proposed. The theory of acoustic vector hydrophone absolute calibration is introduced. By measuring the acceleration of radiation surface on the bottom of the tube and using the distribution patterns of pressure and particle in the vertical direction in plane standing wave sound field, the calibration formula is obtained. The radiation surface of the calibration apparatus is improved, and the accelerometer for measuring radiation surface is calibrated. Finally, both the sensitivity and directivity of an acoustic vector hydrophone are tested by the absolute calibration apparatus. The results show that in the allowable error range of ±1 dB, the absolute calibration apparatus can be used for absolute calibration of acoustic vector hydrophone within the 10~315 Hz frequency range.