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针对目前CMOS探测器的噪声研究绝大部分采取频率域的分析方法,所得的结果对于实际的探测器应用指导性不强。从时间域出发,构建了全新的探测器噪声模型,分析了在探测器的不同工作时期内噪声量大小同时间的关系。给出了探测器工作时序的优化准则,积分时间越长,系统的信噪比增加,输出信号电压值增大,等效输入端信噪比不变,系统的动态范围减小;复位时间越短,输出噪声量越小,但是图像的滞后效应也就越严重,在对弱小目标进行成像时应该尽可能地减少复位时间,增大积分时间,对于亮目标成像,应该增大复位时间,减少积分时间。
For the most part, the research on the noise of the CMOS detector adopts the method of frequency domain analysis, and the results obtained are not helpful for the actual detector application. Starting from the time domain, a new detector noise model is constructed, and the relationship between the amount of noise in different working periods of the detector over time is analyzed. The optimal guideline of the working sequence of the detector is given. The longer the integration time, the higher the signal-to-noise ratio of the system and the increase of the output signal voltage value, the same signal-to-noise ratio of the equivalent input terminal and the smaller dynamic range of the system. Short, the output noise is smaller, but the image lag effect is also more serious, in the imaging of small and small targets should be reduced as much as possible to reduce the reset time, increase the integral time, for bright target imaging, should increase the reset time, reduce Integration time.