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对于入射辐射图案相应于图像的一个空间傅里叶分量,本文拟就下列各种类型的热电成像系统加以分析:热电摄象管(以摄全景方式工作)、线性扫描列阵和圆形扫描列阵。然后,得出热电电荷数值的表达式作为研究图象中空间频率的函数,并以此式表示系统的热调制转换函数。在这些结果的基础上,于热电成像系统的可选择的两种型式之中作出两种详细的理论比较。第一种指的是在热电摄象管以调制方式和以摄全景方式这两种工作方式之间所进行的比较,我们据此而发现,虽然实际上这两种方式不分上下,但摄全景方式能够给出比调制方式更好的性能。第二种比较是在线性扫描系统和圆形扫描系统之间进行的(两者用的是同样的一维探测器列阵)。我们由此得出结论:圆形扫描系统在实际使用上虽较简便,但它在某些应用方面所给出的性能可同线性扫描列阵相竞争。
For a spatial Fourier component of the incident radiation pattern corresponding to the image, the following types of thermoelectric imaging systems are to be analyzed in this paper: a thermocouple tube (in a panoramic view mode), a linear scan array and a circular scan column Array. Then, the expression of the thermoelectric charge value is obtained as a function of the spatial frequency in the study image, and the thermal modulation transfer function of the system is expressed by this equation. Based on these results, two detailed theoretical comparisons are made among the two alternative types of thermoelectric imaging system. The first one refers to the comparison between the two modes of operation of the thermoelectric camera in the modulation mode and the panoramic mode. From this we can see that although in fact these two modes are not divided up and down, Panoramic gives better performance than modulation. The second comparison is between a linear scanning system and a circular scanning system (both using the same one-dimensional detector array). We conclude from this that although the circular scanning system is simpler to use, its performance in some applications may compete with linear scanning arrays.