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应用菲涅耳衍射和全息理论 ,详细分析了无透镜傅里叶变换数字全息图的记录、再现方法和再现像的特点 ,分析了相移数字全息图的记录和再现方法 ,并进行了相应的实验验证。结果表明 :直接对无透镜傅里叶数字全息图进行傅里叶逆变换可同时得到与物体完全相同的再现像及其共轭像 ;同轴无透镜傅里叶数字全息术能最大程度满足CCD对采样条件的要求 ,从而可以增大记录物体的尺寸 ,减小记录距离 ,明显提高再现像的清晰度和分辨率 ;相移数字全息术能有效地消除数字再现光场中的零级光场和共轭像 ,显著提高再现像的信噪比。条件许可时 ,相移同轴无透镜傅里叶数字全息术是目前解决数字全息术中再现像的分离与满足采样条件之间矛盾的最佳方法。
Using Fresnel diffraction and holographic theory, the characteristics of recording, reproducing method and reproducing image of digital lensless Fourier transform digital hologram are analyzed in detail, and the methods of recording and reproducing phase-shifted digital hologram are analyzed. Correspondingly, Experimental verification. The results show that the direct Fourier transform of the lensless Fourier digital hologram can obtain the same reconstructed image and its conjugate simultaneously with the object. The coaxial lensless Fourier digital holography can meet the requirements of CCD The requirements of the sampling conditions can increase the size of the recorded object, reduce the recording distance, and obviously improve the sharpness and resolution of the reproduced image. Phase-shift digital holography can effectively eliminate the zero-order optical field in the digital reproduction light field And conjugate images, significantly improving the signal-to-noise ratio of the reproduced image. When conditions permit, the phase-shift in-line lensless Fourier digital holography is the best solution to the conflict between the separation of the reproduced image and the satisfaction of the sampling conditions in digital holography.