中国激光, 2018, 45 (6): 0609001, 网络出版: 2018-07-05   

复杂物体离轴-同轴复合数字全息高分辨率成像 下载: 894次

In-Line and Off-Axis Hybrid Digital Holography for High Resolution Imaging of Complex Shape Objects
作者单位
1 赣南师范大学物理与电子信息学院, 江西 赣州 341000
2 北京工业大学应用数理学院, 北京100124
摘要
当被测物体不满足稀疏条件时,传统同轴数字全息相位恢复方法无法消除共轭像的干扰,也无法获得正确的相位重建结果;而离轴数字全息受最小记录距离的限制分辨率较低。为此,提出了一种将离轴和同轴数字全息相结合的复合数字全息成像方法。该方法只需记录一幅离轴全息图和一幅同轴全息图;采用约束最优化算法从离轴全息图中得到记录平面内物光波的近似相位分布;将此相位信息与同轴全息图的强度信息合成记录面内物光波复振幅的初始值;再利用迭代算法实现物体强度像和相位像的高分辨率重建,该方法的理论分辨率与图像传感器的分辨率相同。实验结果表明,该方法可以充分利用图像传感器的空间带宽积,能在对复杂物体成像时消除共轭像,实现大视场、高分辨率数字全息成像,实验成像分辨率接近理论分辨率。
Abstract
The traditional phase retrieval of in-line digital holography is invalid to eliminate the twin image and to get accurate phase when the object does not conform the sparsity, while the resolution of the off-axis digital holography is low due to the limitation of the minimum of the recording distance. An in-line and off-axis hybrid digital holography is proposed. The off-axis and in-line holograms are recorded respectively. The approximate phase distributions in the recording plane are obtained by constrained optimization approach from the off-axis hologram, and they are used as the initial value in the iterative procedure of the reconstruction of the in-line hologram, then the high quality amplitude and phase images are reconstructed. The ideal resolution of the hybrid digital holography is analyzed. The experimental results show that the proposed method can utilize the full spatial bandwidth of the image sensor, it can realize a large field of view and high resolution digital holographic imaging without the interference of the twin image when the objects have complex shape, and the resolution in the experiments approach the ideal resolution.

王凤鹏, 王大勇, 王云新, 戎路, 赵洁. 复杂物体离轴-同轴复合数字全息高分辨率成像[J]. 中国激光, 2018, 45(6): 0609001. Fengpeng Wang, Dayong Wang, Yunxin Wang, Lu Rong, Jie Zhao. In-Line and Off-Axis Hybrid Digital Holography for High Resolution Imaging of Complex Shape Objects[J]. Chinese Journal of Lasers, 2018, 45(6): 0609001.

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