本文采用自动数据采集及FFT技术研究应力波的弥散与衰减特性。

Dispersion and attenuation characteristics of stress waves were studied by means of the automatic data collection and FFT technique.

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主要采用了F - K域滤波法、内切除和近道能量衰减法压制多次波三种技术，取得了较好的效果。

Mainly used three methods, including including the F-K domain filter, internal excision and the energy decay method to attenuate multiple and obtained a more ideal result.

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采用时间增益补偿技术，补偿超声波在空气中的衰减，减少回波信号的起伏；由有源全波整流电路和微分电路等组成峰值时间检测电路，可正确检测回波的峰值到达时间。

The peak time detecting circuit which is composed of full-wave rectification circuit and differential circuit can detect the reach time of echo signal accurately.

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