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设计任何红外装置中所必不可少的一步,就是减少噪声源到允许的电平,以适应于信号的处理。热噪声源或约翰噪声源被看作为光子探测器的基本噪声电平。这类型的噪声直接与温度有关;温度越低,约翰噪声就越小。产生—复合噪声也与温度有关系。电流或l/f 噪声似乎不受温度影响。环境温度噪声特性大的光子探测器,一般都要冷却到90°K 或者更低一些,其性能的改
An indispensable step in designing any infrared device is to reduce the noise source to a permissible level to suit the signal processing. Thermal noise sources or John noise sources are considered as basic photon detector noise levels. This type of noise is directly related to temperature; the lower the temperature, the less John noise. Produced - Compound noise is also temperature dependent. Current or l / f noise does not seem to be affected by temperature. Ambient temperature noise characteristics of photon detectors, generally have to be cooled to 90 ° K or lower, the performance of the change