利用互相关技术，计算信号在不同传感器上的时间延迟，再由平面几何原理，得到波的方位和波速。

With the correlation technique, direction and speed of the infrasound can be calculated by computing the time delay of each detector and by using geometric knowledge.

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从理论上定量给出方位变化与延迟量变化的关系，从而为延迟器件的调整和正确使用提供理论依据。

For the relation between the change of placement and that of retardation is given in theory, we have the theoretical basis to adjust and use correctly phase retarder.

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分析实验曲线，可计算出波片的延迟量，同时也可确定波片快慢轴的方位。

The phase delay can be calculated and the placement of the fast and slow axis of the wave plate can be marked after analyzing the curve.

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