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探测器的选择大家知道:皮肤能近似看成是一种300°K的黑体。其辐射能光谱分布曲线有一个灵敏波长等于10微米的最大值。在只用一个光子探测器的情况下,为使仪器具有足够的灵敏度,考虑到辐射能光谱分布则探测器的光谱灵敏区应至少在3微米以上。目前还没有这些光谱区的类似可见光电视那样的摄像管。这样的一些管子将几乎不会用于医学热成像,因为在这种情况下摄影视场中灵敏度应有很高的均匀性,采用二维靶面来达到是很困难的。懂得制作探测器阵列块已有好几年了,这是把几十个或上百个探测器一个挨一个地排成一列。图7就是LEP热像仪上所安装的探测器陈列块。
The choice of detector We all know: the skin can be approximated as a blackbody of 300 ° K. Its radiation spectral distribution curve has a sensitivity wavelength equal to 10 microns maximum. In the case of a single photon detector, the spectral sensitivity of the detector should be at least 3 microns in order to give sufficient sensitivity to the instrument, taking into account the spectral distribution of the radiant energy. There is currently no camera tube like these visible-light televisions in these spectral regions. Such tubes will be scarcely used for medical thermography because the sensitivity in a photographic field should be very uniform in this case and it is difficult to achieve with a 2D target. It has been several years since we knew how to make detector array blocks, which put dozens or hundreds of detectors one by one in a row. Figure 7 is the LEP thermal imager installed on the display block.