Low Noise CCD System Design and Implementation Based on Thermoelectric Refrigerating Unit

By the research on the characteristics of CCD temperature - noise, this paper designs a cooling CCD which uses a miniaturized refrigeration technique in order to meet the request of obtaining high-quality image in the dim light conditions. The design uses thermoelectric cooling technology and accomplishes the cooling design and optimization of refrigeration cavity with the assistance of Qfin. The CCD temperature control is implemented by the incremental temperature control algorithm. The experimental results show that the system can low the operating temperature of CCD by 40°C with the ±0.1°C temperature accuracy, the quality of the image which is obtained by CCD in low temperature has obviously improved.