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.
好相反，环境背景辐射对两个热释元件几乎具有相同的作用，使其产生释电效应相互抵消，于是探测器无信号输出。
Good contrary, environmental background radiation on almost two pyroelectric devices have the same role to produce a pyroelectric effect of offset each other, so no detector signal output.
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