Abstract An incoherent digital holographic imaging system was constructed in this study based on the Michelson interferometer, where the distance of the observed object can be calculated via mathematical modeling. We obtain the composite hologram by generalized phase-shifting method, then utilize the contrast evaluation function to determine the focus distance of composite hologram. The relationship between the focus distance and observation distance is deduced accordingly to complete the measurement process. Experiments show that the uncertainty of the proposed method decreases as observed distance increases in the range of 508 mm–660.4 mm. The results presented in this paper may provide a theoretical foundation for incoherent holographic imaging and three-dimensional measurement.

中文翻译：

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基于非相干数字全息成像的观测距离测量方法

摘要 本研究构建了基于迈克尔逊干涉仪的非相干数字全息成像系统，通过数学建模计算出被观测物体的距离。我们通过广义相移方法获得复合全息图，然后利用对比度评估函数来确定复合全息图的焦距。据此推导出焦距与观察距离的关系，完成测量过程。实验表明，随着观测距离在 508 mm–660.4 mm 范围内增加，所提出方法的不确定性降低。本文的研究结果可为非相干全息成像和三维测量提供理论基础。