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将CCD与电寻址液晶(EALCD)相结合,CCD作为记录介质,用于全息图和全息再现像的记录,EALCD则代替传统光学全息中曝光后的全息干板,用于数字全息图的再现。这种方法不仅避免了传统全息记录材料显影、定影等过程,也避免了全息材料非线性记录等缺点,并可以实现普通的数字全息较难实现的基于相位移法的位移测试。利用双曝光数字全息干涉法,在实验中对反射式被测物体生成的菲涅耳全息图进行了光学再现,并得到了准确的数据,验证了该方法的实用性。实验结果表明,CCD与EALCD相结合,可以实现数字全息图的光学再现,通过获得的干涉条纹,可精确测定物体位移量。
The combination of CCD and EALCD, CCD as a recording medium for holographic and holographic reproduction of the image recording, EALCD instead of the traditional optical holographic plate after exposure to holographic for digital hologram reproduction . This method not only avoids the process of developing and fixing traditional holographic recording materials, but also avoids the disadvantages of non-linear recording of holographic materials and the displacement measurement based on the phase shift method, which is hard to be realized by common digital holography. Using double exposure digital holographic interferometry, the Fresnel hologram generated by the reflective object was optically reproduced in the experiment, and the accurate data was obtained, which verified the practicability of the method. The experimental results show that the combination of CCD and EALCD can realize the optical reproduction of digital holograms. The interference fringes obtained can accurately measure the displacement of objects.