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为了评估科学CCD噪声带给激光近场分布测量的影响,采用三维噪声模型,分析了科学级CCD的噪声,并将CCD的噪声分解为空间噪声和时间噪声。空间噪声用来评估CCD像元之间响应不一致性对测量的影响,时间噪声用来评估多次测量不一致性对测量的影响。通过设计测量系统对CCD三维噪声进行测量,并分析时空噪声的统计分布规律,发现两者均是依赖于信号、近似服从正态分布,建立了依赖于信号的时空噪声的数学模型,并实验验证了该模型是有效的。
In order to evaluate the influence of CCD noise on the measurement of laser near-field distribution, a three-dimensional noise model was used to analyze the noise of a CCD with a scientific level. The CCD noise was decomposed into spatial noise and temporal noise. Spatial noise is used to assess the effect of inconsistencies in response to CCD measurements on the measurement. Time noise is used to assess the effect of multiple measurement inconsistencies on the measurement. By measuring the CCD three-dimensional noise and analyzing the statistical distribution of space-time noise, we found that both of them are signal-dependent and approximate to the normal distribution. The mathematical model of time-space noise dependent on the signal is established and verified experimentally The model is valid.