Sun Zhiwei, Sun Jianfeng, Hou Peipei, Zhou Yu, Xu Qian, Zhang Ning, Liu Liren
Appl Opt. 2015 Feb 1;54(4):627-35. doi: 10.1364/AO.54.000627.
A principle scheme of a lensless optical processor for synthetic-aperture imaging ladar (SAIL) is proposed. The collected data from SAIL is initially digitally added with a quadratic phase in the range direction. These data are then uploaded on a liquid crystal spatial light modulator to modulate the incident light. The target image is obtained through two-dimensional (2D) free-space Fresnel diffraction. The imaging process is mathematically analyzed using a 2D data-collection equation of strip-mode side-looking SAIL. The design equation, imaging resolutions, and target-image compression ratios are presented. Based on this principle scheme, we construct an experimental optical SAIL processor and present the imaging result of data obtained from one SAIL demonstrator. The optical processor is found to exhibit the flexible property of digital processing, as well as the fast processing capability of optical means, because this optical processor is a lensless system.
提出了一种用于合成孔径成像激光雷达（SAIL）的无透镜光学处理器的原理方案。从SAIL收集的数据首先在距离方向上用二次相位进行数字相加。然后将这些数据上传到液晶空间光调制器上以调制入射光。通过二维（2D）自由空间菲涅耳衍射获得目标图像。使用条带模式侧视SAIL的二维数据收集方程对成像过程进行数学分析。给出了设计方程、成像分辨率和目标图像压缩比。基于该原理方案，我们构建了一个实验性光学SAIL处理器，并展示了从一个SAIL演示器获得的数据的成像结果。由于该光学处理器是一个无透镜系统，因此发现它具有数字处理的灵活性以及光学手段的快速处理能力。
