一种提高CCD探测灵敏度的方法

阐述了影响ＣＣＤ探测灵敏度的暗电流及暗电流噪声的产生机理，分析了其对ＣＣＤ性能的影响。在此基础上，提出了一种新型的利用半导体致冷器件ＴＥＣ对ＣＣＤ进行致冷的方案，并对设计过程中要注意的问题进行了具体分析。最后运用实例说明了通过此方法，大大地降低了ＣＣＤ暗电流，提高了其探测灵敏度。文章还对这种新颖的热电致冷方法和传统的液氮致冷方法进行了分析、比较，指出了ＣＣＤ热电致冷的优势及发展前景。

A Method for Improving the CCD Sensitivity

The dark current that affects CCD detection sensitivity is described.The generating mechanism of dark current noise and its influence on CCD performance are analyzed.A new method that cooling CCD by means of semiconductor refrigerating device TEC is put forward on this basis and some problems which should be paid attention to during the design course are concretely analyzed.The practical examples finally demonstrate that dark current is greatly reduce and the detection sensitivity is improved by means of this method.Analysis and comparison of this novel thermoelectric refrigerating with the traditional liquid nitrogen refrigerating are carried out in the paper.The superiority and development prospects of CCD thermoelectric refrigerating are also described.