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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A new method to design source-withdrawal weighting transducer is presented, which avoids the complexity when using traditional design methods.

提出了极性抽指加权叉指换能器设计的新方法，克服了传统设计方法的繁杂性。

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Here the relative moving is between the RBC (red blood cell) in the blood and the source of the ultrasound transducer.

这里发生相对运动的是血中的红细胞和超声换能器的声源。

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