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.
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.
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。
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