There are a lot of research on the acoustic characteristics of the acoustic emission transducer and its array for the emission energy is concentrated in some specific direction.
在水声方面，为了得到用较小的发射功率探测到更远得距离的目标，使发射能量集中在某些特定方向，人们对水声发射换能器及其基阵的声特性进行了很多研究。
The distance between the acoustic-emission source and the receiving transducer, and the background noise level are primary factors in selecting a particular frequency band.
声发射源与接收讯号传感器间的距离以及环境噪声的电平是选择频带的主要依据。
The distance between the acoustic-emission source and the receiving transducer, and the background noise level are primary factors in selecting a particular frequency band.
声发射源与接收讯号传感器间的距离以及环境噪声的电平是选择频带的主要依据。
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