【作者】 贾广慧； 陈毅； 费腾； 平自红；

【Author】 JIA Guang-hui;CHEN Yi;FEI Teng;PING Zi-hong;Hangzhou Applied Acoustics Research Institute;

【机构】 杭州应用声学研究所；

【摘要】 回顾了矢量水听器自由场水声声压梯度互易原理和校准方法。将发射器—消声水池—接收器所构成的测量系统看作一个线性时不变响应系统,利用复移动加权平均(CMWA)技术,可以消除水池反射和本底噪声对测量产生的影响,得到该线性时不变系统在自由场条件下的传递函数。基于系统传递函数分别得到自由场条件下发射换能器、互易换能器和矢量水听器彼此之间转移阻抗的频率响应。建立矢量水听器自由场互易校准系统,并利用该系统在250Hz～4 kHz频率范围内对VHS90型矢量水听器的灵敏度进行宽带校准。将校准结果同驻波管连续波法和自由场脉冲法进行比较分析,分析结果表明:本文所述的校准方法与其他校准方法的最大偏差不超过±0.7dB。更多还原

【Abstract】 the reciprocal calibration principle and method of underwater sound pressure gradient in free field are reviewed.The projector-water tank-receiver measurement system could be considered as a linear time-invariant(LTI) system,and the technique of complex moving weighted average(CMWA) is used in this paper,which could eliminate the effect of background noise and reflecting wave and get the transfer function(TF) of LTI system in free field.The frequency response of transfer impedance between projector,reciprocal transducer and vector receiver are measured using TF.The vector receiver reciprocal calibration system is established which could realize the wide-band calibration of VHS90 vector receiver in frequency range 250 Hz to 4 kHz.The calibration results are compared with the results of continuous wave method in standing wave and the tone-burst method in free-field,which show that the deviation between the wide-band calibration method described in this paper and other methods does not exceed ±0.7 dB.更多还原