数字全息再现像质的影响因素分析

Analysis of the Influence Factors of the Reconstructed Image Quality in Digital Holography

依据相干成像理论,从分析数字全息系统点扩散函数入手,研究数字全息系统中影响再现像质的因素。主要分析了对一给定的CCD和记录波长,记录距离对传递函数的影响,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;给出了最小允许的记录距离数学表达式及相应的实验结果。实验结果证明了理论分析的正确性。

On the basis of coherent image theory, starting with the analysis of a point spread function of digital holography, the influence factor of the reconstructed image quality in digital holography was studied. The main analysis was that, for a certain CCD and the recording wavelength, the transfer function was influenced by the recording distance, and the reconstructed image quality was also investigated. It comes to a conclusion that the object should be placed as close as possible to the CCD target in the digital recording of hologram when the sampling theorem is fulfilled. The mathematical description of the minimum allowable recording distance in digital holography was given, and the relevant experimental results were also presented. The experimental results show the validity of theoretical analysis.