Wang Chao, Xing Siyuan, Xu Miao, Shi Haodong, Wu Xingkai, Fu Qiang, Jiang Huilin
Jilin Provincial Key Laboratory of Space Optoelectronic Technology, Changchun University of Science and Technology, Changchun 130022, China.
College of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China.
Sensors (Basel). 2022 Apr 1;22(7):2717. doi: 10.3390/s22072717.
Superresolution (SR) imaging technology based on compression coding has always been considered as the key to break through the geometric resolution of the detector. In addition to factors such as the reconstruction algorithm and mounting platform vibrations, the impact of inherent errors in the optical system itself on the reconstruction results of SR imaging is also obvious. To address this issue, a study on the design of the SR optical system and the influence of optical alignment errors on SR imaging was conducted. The design of the SR optical system based on digital micro-mirror device (DMD) for long-wave infrared wavelength was completed, and an athermal analysis of the system was carried out. The design results showed that the SR optical system has good imaging quality in the operating temperature range. The imaging model of the DMD SR imaging optical system is established according to the designed SR optical system. We investigated the influence of various alignment errors, including decenter, tilt, lens interval error and defocus, on the imaging properties of the SR optical system. Various random combinations of alignment errors were introduced into the optical system, respectively, and the SR reconstructed image quality of the imaging system was analyzed using the inverse sensitivity method to obtain the tolerance limits when the system was assembled. Finally, the effectiveness of the method to obtain the alignment tolerance limit of the compression coding SR imaging optical system was verified through a desktop demonstration experiment.
基于压缩编码的超分辨率（SR）成像技术一直被视为突破探测器几何分辨率的关键。除了重建算法和安装平台振动等因素外，光学系统本身固有误差对SR成像重建结果的影响也很明显。为解决这一问题，开展了关于SR光学系统设计及光学对准误差对SR成像影响的研究。完成了基于数字微镜器件（DMD）的长波红外波长SR光学系统设计，并对该系统进行了无热分析。设计结果表明，该SR光学系统在工作温度范围内具有良好的成像质量。根据设计的SR光学系统建立了DMD SR成像光学系统的成像模型。研究了偏心、倾斜、透镜间隔误差和离焦等各种对准误差对SR光学系统成像特性的影响。将各种对准误差的随机组合分别引入光学系统，采用逆灵敏度方法分析成像系统的SR重建图像质量，以获得系统组装时的公差极限。最后，通过桌面演示实验验证了获取压缩编码SR成像光学系统对准公差极限方法的有效性。
