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依据相干成像理论,从分析数字全息系统点扩散函数入手,研究无透镜傅里叶变换数字全息系统中影响再现像像质的因素。主要分析了对一给定的 CCD 和记录波长,记录距离对系统点扩散函数的影响,进而分析了对再现像像质的影响,得出了在满足抽样定理的条件下,应尽量使记录物体靠近 CCD,并给出了最小允许的记录距离数学表达式。计算机模拟结果证明了理论分析的正确性.
According to the theory of coherent imaging, starting from the analysis of the point spread function of digital holography system, the factors that affect the reproduced image quality in lensless Fourier transform digital holography system are studied. The influence of a given CCD and recording wavelength and recording distance on the system point spread function is mainly analyzed. Then the influence on the reproduced image quality is analyzed. It is found that under the condition of satisfying the sampling theorem, Close to the CCD, and gives the minimum allowable distance recording mathematical expression. Computer simulation results prove the correctness of the theoretical analysis.