To suppress the influences aroused by CCD noise in measuring laser near field distribution, the paper proposes a method to correct CCD noise using a priori knowledge of CCD noise and its observed value based on contrast test model. Compared with the existing method, this method can suppress the influences caused by CCD noise effectively, thus lowering measurement uncertainty and improving measurement confidence, and the extended uncertainty reduces from 0. 6% to 0. 3%.%为了有效抑制CCD测量噪声带给激光对比度分布测量的影响,基于对比度测量模型,利用CCD测量噪声的先验知识及其输出观测值,给出了CCD噪声的校正方法.与现有计算方法的比较表明,该方法可以有效抑制CCD测量噪声带给测量的影响,其扩展不确定度从0.6％降低至0.3％,降低了测量不确定度,提高了测量的置信度.
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