热释电探测器为交变信号检测器件，根据这一原理，研制了一种新的激光训练系统，完全解决直射光的问题。
Pyroelectric detectors depend upon alternating signal, based on which a new kind of laser training system was developed, and the problem of direct light was solved.
被检测的热释电红外信号经过滤光镜片和摆动的凸透镜聚焦后，其红外光焦点同样也进行微幅摆动。
The detected pyroelectric infrared signal passes through an optical filter and is focused by the swinging convex lens and the infrared focus is also swinging slightly.
这样，安装在红外光焦点运动轨迹上的热释电敏感元件被红外光焦点不断扫描而产生自主采样的热释电信号。
So, the pyroelectric sensor that is located on the moving track of the infrared focus is scanned by the infrared focus signal continuously and generates the autonomous sampling pyroelectric signal.
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