点源参考光数字全息的频谱和记录能力分析

基于最高空间频率分析法,对点源参考光数字全息的空间频谱进行了分析,得出了使空间频谱分离的条件。结合全息成像系统的分辨率,推导出了同时满足采样和再现像分离的记录条件以及CCD对被记录物体的数据记录能力。结果表明,对给定的物体和CCD来说,采用点源参考光比采用平面参考光更容易满足采样和分离的条件,并可以记录到更多的物体信息,从而可使再现像获得更高的分辨率。

Analysis of the spatial spectrum and recording capability of the digital holography with point reference wave

According to the method of highest spatial frequency,the spatial frequency of the digital hologram is analyzed with point reference wave,and the separation conditions of its spatial spectrums are derived by ranking the spatial frequency in the CCD frequency domain.The recording condition to fulfill the requirements of sampling and separation of reconstructed image is deduced.The recording capability of the CCD is obtained by looking the digital hologram as an image system.The theoretic analysis shows:for the certain object and CCD,compared with the plane reference wave,it is easier for the digital holography of the point reference wave to fulfill the requirements of recording sampling and reconstructing separation,meanwhile,to record more object information,so it can obtain higher resolution for the reconstructed image.