【摘要】 本文提出一种基于盲信号分离的新的复波恢复方法。首先通过CCD获取同一物体的3幅干涉全息图构成观测信号,然后采用独立分量分析方法从观测信号中分离出只包含复波振幅和相位信息项,有效抑制了零级项,最后用该方法实现了一个纯位相波阵面。实验结果表明,该方法能较好地恢复原复波的振幅和相位信息,即使在频谱混叠情况下,也能有效恢复原复波信号。更多还原

【Abstract】 In the process of the reconstruction of digital holography,the traditional methods of diffraction and filtration are commonly adopted to recover the original complex-wave signal.Influenced by twin-image and zero-order terms,the above-mentioned methods,however,either limit the field of vision or result in the loss of the amplitude and phase information.This thesis presents a new method for complex-wave retrieval,which is based on blind signal separation.At first,three frames of holograms are captured by a CCD-camera to form an observation signal.Then,the term containing only amplitude and phase information of the complex-wave is separated from the observation signal by means of independent component analysis(ICA),which effectively eliminates the zero-order term.Finally,the complex-wave retrieval of pure phase wavefront is achieved.Experiment results show that this method can better recover the amplitude and phase information of the original complex-wave even in the case when there is a frequency spectrum mixture in the hologram.更多还原