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在对红外热像仪的测量中,噪声是评价红外热像仪性能的主要参数。噪声参数包括时间域噪声和空间域噪声,时间域噪声可分为高频时间噪声和低频时间噪声(即1/f噪声);空间域噪声可分为高频空间噪声(即固定模式噪声FPN)和低频空间噪声(非均匀性噪声)。对高频时间噪声和低频时间噪声进行了严格的区分和定义;给出了在短时间内忽略低频时间噪声时高频噪声NETD的计算模型;在不忽略低频时间噪声时计算高频噪声等效温差的数学计算模型和测量方法;对高频时间域NETD测量结果进行了不确定度分析与评价。
In the measurement of thermal imaging cameras, noise is the main parameter to evaluate the performance of thermal imaging cameras. The noise parameters include time domain noise and spatial domain noise. Time domain noise can be divided into high frequency temporal noise and low frequency temporal noise (ie 1 / f noise); spatial domain noise can be divided into high frequency spatial noise (ie, fixed mode noise FPN) And low-frequency spatial noise (non-uniform noise). The high-frequency time noise and the low-frequency time noise are strictly distinguished and defined. The calculation model of high-frequency noise NETD is given when the low-frequency time noise is ignored in a short time. The high frequency noise equivalent is calculated when the low-frequency time noise is not neglected Temperature difference between the mathematical model and measurement methods; high-frequency time-domain NETD measurement results of the uncertainty analysis and evaluation.