半导体制冷型高帧频CMOS数字摄像机研究与成像噪声分析

为了提高高速CMOS图像传感器的成像质量，降低图像传感器暗电流和随机噪声，文章中介绍了采用半导体制冷的方法来设计高帧频CMOS数字摄像机成像系统，针对该相机系统设计出结构一体化的多级半导体制冷制冷器，实现制冷量可控。图像传感器制冷后的温度与环境温度的温差最大可达40度，暗电流固定模式噪声降低50%，瞬态随机噪声减少90%,图像信噪比提高6dB。该相机系统具有集成度高，结构紧凑，高分辨率高帧频，高信噪比，宽动态范围，成像质量好的特点。

Study on semiconductor cooling high frame rate CMOS digital camera and its imaging noise analysis

For improving high-speed CMOS sensor imaging quality, reducing image sensor dark-current and spatio-temporal noise，the design of high frame rate CMOS digital camera system cooling by semiconductor refrigerator is introduced in the article. For this camera cooling system, It is implemented that refrigeration quantity can be controlled by the designed integrative multilevel semiconductor refrigerator. The difference in temperature of the sensor cooling temperature to surroundings temperature can attain max 40 degree. FPN( Fixed Pattern spatial Noise) of dark current can be reduced 50%, The random spatio-temporal noise can be reduced 90%, image SNR (Signal Noise Ratio) can be increased 6 dB. The designed cooling camera system has such advantaged features that high density of integration, compact structure, high resolution and high frame rate, high SNR, wide dynamic range, good imaging quality.