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.
红外辐射温度场反映了背景与目标的红外辐射特性，在目标与环境特性领域的研究中具有重要的意义。
The infrared radiation temperature field indicates the infrared radiation characteristic of the background and target, and has important significance in the research of the target and surrounding.
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