条纹变像管压缩超快成像系统研制  

Development of Compressed Ultrafast Photography System for Streak Tube

作　　者：蔡厚智[1] 杜卓铭 姚方鼎 刘俊凯 刘进元[1] 向利娟 CAI Houzhi;DU Zhuoming;YAO Fangding;LIU Junkai;LIU Jinyuan;XIANG Lijuan(Shenzhen Key Laboratory of Photonics and Biophotonics,Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,China)

机构地区：[1]深圳大学物理与光电工程学院教育部/广东省光电子器件与系统重点实验室深圳市光子学与生物光子学重点实验室,深圳518060

出　　处：《光子学报》2024年第11期1-10,共10页Acta Photonica Sinica

基　　金：国家自然科学基金(No.62001301);广东省基础与应用基础研究基金(No.2024A1515011832);深圳市科技计划项目(Nos.JCYJ20230808105019039,JCYJ20220814133504001,JCYJ20210324095007020);深圳市光子学与生物光子学重点实验室(No.ZDSYS20210623092006020);深圳大学2035追求卓越研究计划项目(No.2023C007);深圳大学高层次人才引育(No.000001032080)。

摘　　要：设计了基于压缩感知和条纹相机的压缩超快成像系统,并对其进行模拟仿真和实验研究,原始三维图像经数字微镜设备进行编码调制,然后传输至狭缝全开条纹变像管,经偏转电场作用后,多幅不同时间图像叠加,并在CCD上输出最后积分图像。采用即插即用总变分还原算法将CCD积分图像重构出多幅不同时间的原始图像。对压缩超快成像系统采样和重建过程进行模拟仿真,还原了超快场景信号,峰值信噪比优于45 dB,图像相似性系数优于99%。研制了压缩超快成像系统,对皮秒脉冲激光的时空强度演化过程进行了诊断,脉冲光斑演化的时间长度约为30 ps,重建出12帧不同时间激光光斑图像,重建精度为96.06%。Ultrafast diagnosis technologies are primarily employed to acquire images and information from ultrafast phenomena in the fields of physics,optics,and materials at nanosecond even femtosecond scale.Compressed Ultrafast Photography(CUP)is a major breakthrough in the field of ultrafast diagnosis,which is one of the cutting-edge technologies to acquire information efficiently in ultrafast dynamic events.According to Nyquist Theorem,the sampling frequency must be at least twice the frequency of the original signal to ensure that the sampled signal can accurately reconstruct the original signal.But in the condition where the Compressed Sensing(CS)theory is applicable,when the signal satisfies sparsity,the original signal can be reconstructed with high quality in conjunction with a priori knowledge,even when the sampling rate is significantly lower than that required by Nyquist Theorem.The streak camera is one of the major devices for ultrafast diagnosis with ultra-high temporal resolution which is at picosecond scale.The streak camera converts the optical signal into a photoelectron beam through the photocathode.Whereafter,the streak camera deflects the photoelectron beam with a time-varying deflecting electric field,and the imaging position of photoelectron beam changes over time.Therefore,the streak camera is able to realize time-resolved images of the photoelectron beam with high temporal resolution.In order to avoid overlapping of images of different moments,a slit is added to limit the spatial range of the optical signal,thus the streak camera is only able to realize one-dimensional imaging in general.However,since CUP combining CS theory with streak camera,it has both high temporal resolution and two-dimensional spatial-resolved capability.Consequently,CUP is able to realize time-resolved two-dimensional spatial diagnosis of ultrafast events with one single shot.In this paper,a CUP system is designed and presented.Two-dimensional ultrafast diagnosis experiment is simulated,and the experimental platform of CUP sy

关 键 词：超快诊断 压缩超快成像系统 条纹相机 压缩感知 时间分辨率 

分 类 号：TB972[一般工业技术—计量学] TN143[机械工程—测试计量技术及仪器]