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介绍了合成孔径数字全息记录和再现的基本原理,提出了相应的实现方法和技术方案。特别对合成孔径数字全息再现中的两类方法用单参考光记录的子全息图数字再现光场复振幅叠加或强度叠加,以及用多参考光记录的子全息图数字再现光场复振幅叠加或强度叠加方法进行了详细理论分析和实验研究。结果表明,合成孔径技术是一种提高数字全息再现像的分辨率的有效方法。与传统的子全息图直接拼接的合成孔径数字全息再现方法相比,用子数字全息图再现光场复振幅叠加或强度叠加两种再现方法均可实现合成孔径数字全息的再现,并可显著提高再现像的分辨率,但强度叠加方法的记录和再现难度远小于前者。在实际中可以根据解决问题的要求和子数字全息图的记录情况选用。
The basic principle of digital holographic recording and reproduction of synthetic aperture is introduced, and corresponding implementation methods and technical solutions are proposed. Particularly for two types of methods in synthetic aperture digital holographic reproduction, the sub-holograms of a single reference optical record are digitally reconstructed by superposition or intensity superposition of the complex amplitude of the light field and the digital reproduction of the complex amplitude of the light field by sub-holograms recorded with multiple reference light or Intensity superposition method carried out a detailed theoretical analysis and experimental study. The results show that the synthetic aperture technique is an effective method to improve the resolution of digital holographic reconstructed image. Compared with the synthetic aperture digital holography method, which is directly spliced with the conventional sub-hologram, the reproduction of the synthetic aperture digital holography can be realized by reproducing the complex amplitude of the light field or the superposition of intensities by the sub-digital hologram, and can remarkably improve Reproduce the image resolution, but the strength of the superposition method of recording and reproduction is much less difficult than the former. In practice, it can be selected according to the requirements of the problem solving and the record of sub-digital holograms.