在能够获得桩底反射的前提下，脉冲宽度和敲击速度尽量小。

The pulse width and impact velocity as small as possible on the premise that can obtain reflection from the pile toe.

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然后根据奇异点位置确定入射波、缺陷反射波、桩底反射波位置。

Then, the positions of the incident wave, pile-toe reflection wave and flaw reflection wave can be determined by the position of singular point.

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由信号的奇异点位置很容易确定入射波、缺陷反射波、桩底反射波位置。

Then the incident wave, pile-toe reflection wave and flaw reflection wave can be judged by the position of singularity.

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