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《被动光学高光谱强度关联成像技术》2014年度进展报告

         

摘要

经过一年来的努力,基本按时完成了预定的各项研究任务。(1)完成了单次曝光高光谱强度关联光谱成像光学设计理论及实验验证,获得了系统空间分辨率、光谱分辨率及信噪比之间的相互制约关系。完成了基于最临近插值法和双线性插值法的测量矩阵标定方法的建立,建立了自动化标定系统。初步完成了系统测量矩阵的优化设计,加工得到了部分满足设计指标的空间随机相位调制器样件。完成了单次曝光高光谱强度关联成像试验样机光机设计。(2)研制出一台单光子强度关联光谱相机,并开展了2公里的野外成像,采用了互补测量的方法,优化了压缩感知算法,获得了高质量的图像输出。旨在用单光子点探测替代单光子面阵探测器完成单光子级别的超灵敏遥感光谱成像。(3)在理论上创新的提出了通过预先对光谱通道阵列进行更加精细定标的方式,然后引入光谱重构算法,如吉洪诺夫正则化(Tikhonov regularization)算法进行求解,可以在不牺牲其他性能指标或者不增加硬件成本的条件下有效的改善传统分光技术的光谱分辨率。在实验方面,引入了微反射镜(DMD)作为光谱通道选择器,设计了相关的样机系统,验证了理论算法的可靠性和正确性,当对每个光谱通道预先进行更加精细的光谱定标时,系统的光谱分辨率得到了有效的提高。(4)开展了热光信号参量放大的实验和实际物体的光参量图像放大实验研究,完成了热光参量放大闲置光和种子光的关联成像实验,搭建近红外波段光参量放大实验光路,开展了近红外脉冲放大关联成像实验。(5)搭建了无透镜关联成像装置,对太阳光进行了滤波,得到了带宽很窄的太阳光。演示了太阳光的HBT实验,并且在HBT实验的基础上做了一维物体的太阳光关联成像实验。最后我们对实验结果进行了系统的分析,初步得到了太阳光关联成像对比度低的原因,并提出了改进措施。(6)在强度关联图像质量要素表征及评价方法研究方面,本年度主要完成了不同空间和光谱结构及稀疏度的仿真场景构建方法研究;完成了影响被动光学关联成像质量因素分析;初步开展了被动光学高光谱强度关联图像质量评价方法研究;为下一年度的研究工作奠定了基础。初步完成三维图像快速重构算法,和基于梯度投影原理的GPSR_BB算法进行了结果比对,在相同采样率的情况下,图像信噪比得到了很大的提高。在采样率较低的情况下,图像质量提升更加明显,为此可以有效地降低采样次数。%The task of the program has been fulfilled from time to time under one year hard work of our research team. (1). The optical design and experimental verification of single shot hyperspectra ghost imaging has been completed. The mutual restriction relation of space resolution, spectrum resolution and signal to noise ratio has been studied. The standardization of measure matrix has been completed. The optomechanical design of prototype of single shot hyperspectra ghost imaging has been completed. (2).A single photon intensity correlation spectrum camera has been developed. The experiment aims to accomplish the single photon level ultra-sensitive remote sense spectrum imaging with single photon point detector instead of single photon area-array detector. (3).In the theory, the pre-calibration of the spectrum channel array with more precise has been presented, this way can improve spectrum resolution of traditional optical technology without sacrificing any performance or adding any hardware cost. In the experiment, the DMD has been chosen as the spectrum channel selector. The spectrum resolution of system can be effective improved when every spectrum channel is demarcated with high precision. (4).The experiment of thermallight parametric amplification and the experiment research of optical parameter amplification has been started. The correlation of thermal light parameter amplification and seed light has been completed, the optical parametric amplification in near-infrared has been set up and we start the near-infrared pulse amplification correlation imaging experiment. (5).The lensless correlation imaging has set up and HBT experiment of sun light has been demonstrated. The experiment result has been analyzed and we get the reason that sunlight has low contrast during imaging and give some advice to improve it. (6).Our team has studied the spectrum structure in different space and simulation method this year in the representation and evaluation of reconstructed image from ghost imaging. We get better signal to noise ratio under the same sampling rate compared to the GPSR_BB algorithm. When the sampling rate is low, the quality of image can be improved obviously using our algorithm, this can reduce our sampling rate effectively. In conclusion, the program is going well under the hard work of the whole team.

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