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混响场中水声换能器互易校准研究
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摘要
本文针对水声换能器的互易校准法,提出了一种在混响水池中采用空间平均法进行校准的方法。通过测定混响水池的混响时间确定混响场的互易常数,在测量允许的下限频率以上,声源发射单频连续信号,将发射换能器和接收换能器在混响区域内进行空间平均,得到相应电学参量,进而计算得到待测互易换能器和待测水听器的接收灵敏度,通过对水听器校准结果与其出厂自由场校准结果进行对比,测量误差不超过1.4d B,A类不确定度不超过0.13d B,由此证明了该方法的可行性。
In view of the underwater acoustic transducer reciprocity calibration method, this paper puts forward a reverberation pool space average method is adopted to improve the method of calibration.By measuring the reverberation time reverberation pool to determine the reverberation field reciprocity constant, in allowing more than the lower limit of frequency measurement, sound source emission single-rate continuous signal, the transmitting transducer and receiving transducer space average in the area of the reverberation, get the corresponding electrical parameters, and then calculated for the reciprocity of transducer and receiving sensitivity of hydrophone under test, through to the hydrophone calibration results comparing with the results rather than the factory free field calibration, measurement error is less than 1.4 d B, A kind of uncertainty is less than 0.13 d B, which proves the feasibility of this method.
引文
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