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提出了一种在非消声水池中低频换能器测量的空间域处理方法。该方法是在发射和接收换能器保持相对位置不变的情况下,通过多次无规则变换其在有限水域中的位置,让同频反射声的干扰贡献随机和无规则化,最终将上述所有位置接收的信号同步叠加而将同频反射声干扰消除,从而提取出了所需的直达波波形信号,克服了传统的脉冲测量技术受同频反射声干扰无法提取直达信号的问题。在5 m×7 m×6 m非消声水池,测量换能器样品,测量频率范围是400～2500 Hz,测量得到的结果与湖上测试结果相比,两者基本一致。该方法的实现,大大的提高了非消声水池的低频换能器测试能力,有效测量频率下限比一般脉冲测试方法降低一个数量级。
A method of spatial domain measurement of low frequency transducer measurement in non-muffling tank was proposed. In the method, the transmitting and receiving transducers keep the relative position unchanged, and randomly and irregularly the interference contribution of the co-frequency reflected sound is changed by irregularly transforming the position of the transmitting and receiving transducers in the limited water area. Finally, The signals received at all positions are superimposed synchronously and the co-frequency reflected acoustic interference is canceled, thus the required direct wave waveform signal is extracted, thereby overcoming the problem that the traditional pulse measurement technology can not extract the direct signal due to the same frequency reflected acoustic interference. In a 5 m × 7 m × 6 m non-anechoic tank, the transducer samples were measured at a frequency range of 400-2500 Hz. The measured results were basically the same as those on the lake. The realization of this method has greatly improved the testing ability of low-frequency transducers for non-anechoic water tanks, and the lower limit of effective measurement frequency is one order of magnitude lower than the general pulse test method.