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.
借助热红外图像再现实验和图像相关系数算法，证明该方法能较好地再现目标以及背景的热红外辐射特征和细节。
It is verified that this method could reproduce the properties and details of both targets and backgrounds by the thermal IR reproduction experiment and the algorithm of image correlation coefficient.
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