为解决激光相干场成像系统探测器噪声相对总噪声的定量化占比估计问题, 分析探测器噪声是否为主要噪声源, 提出一种探测器噪声占比权重定量化分析计算方法.基于光电子统计方法得到系统信噪比方程, 并引入信噪比中间参数估计方程, 建立了探测器噪声相对总噪声的占比权重定量化计算模型.结合理论分析与实验测量进行验证, 结果表明: 针对构建的相干场成像实验系统, 探测器噪声占比权重达52%, 进一步分析可知实验在大气相对宁静的夜晚进行, 系统受背景光噪声和湍流噪声影响小, 探测器噪声是主要噪声源.所提方法可有效估算探测器噪声占比权重, 具有便捷、高效的特点, 可用于实际相干场成像系统探测器噪声定量化评估测量分析.

In order to settle the problem of quantitativly estimating ratio of detector noise and analyse whether detecoror noise is the main noise in laser coherent field imaging system,a novel method of quantitative analysis detector noise ratio was proposed.The Signalt-to-Noise (SNR) of the system was given by photoelectron statistics method,and estimating equation of SNR intermediate parameter was derived.A quantitative ratio model of detector noise to total noise was established by SNR equation and estimating equation of SNR intermediate parameter.The ratio model was tested and verified by theory analysis and experiment.The results show that in the specific experiment table,detector noise is about 52% of the total noise.Because the experiment was accomplished at night,turbulence noise and background noise had the least influence on the system,detector noise was the main noise source.The conclusion was acquired that the proposed metod can accurately and effectively estimate detector noise ratio to total noise and has the advantage of simplicity and effectiveness.It can be widely applied in quantitative analysing and measuring of detector noise in laser coherent imaging system.