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本文将描述两种变像管皮秒分幅相机和一种飞秒扫描相机的设计特点、动态测试方法和实验结果。第一种变像管皮秒分幅相机采用了交叉点扫描多光栏分幅的方法,其变像管具有长加速电极和短阳极的静电弱聚焦系统与偏转灵敏度高、偏转像质好的偏转群体结构;其超快速控制电路只需一个光电开关斜坡电压脉冲发生器和一个特殊设计的脉冲成形网络即可送出具有合适时间关联的4对正负极性三角波和一对正负极性的单台阶液电压脉冲。实验表明,该相机在提供6幅分幅图像的情况下,每幅图像全曝光时间为80ps,除 3～4幅图像间的时间间隔为680ps外,其余均为160ps,动态空间分辨率达到5.51p/mm。第二种变像管皮秒分幅相机采用快门式分幅方法;其变像管采用行波偏转系统,内增强MCP做成带状线结构,并具有输入输出阻抗变换器,其三台阶波和快门脉冲序列均由光电开关电路和脉冲成形网络产生。该相机在提供三幅分幅图像的情况下,每幅图像全曝光时间为660ps,画幅之间的时间间隔均为4ns,动态空间分辨率为5.5lp/mm。飞秒扫描相机采用MCP内增强飞秒扫描变像管、具有负时间畸变的中继透镜和无触发晃动的光电开关扫描电路。实验证明,该相机在时间分辨率为500fs时,其动态范围为30;当时间分辨率为1.2ps时,其动态范围可达500;无扫描图像弯曲现象
This article describes the design features, dynamic test methods, and experimental results of two variable-pitch picosecond framing cameras and a femtosecond-scan camera. The first variant picosecond sub-camera uses a cross-point scanning method of multi-sectional framing. The video tube has a long accelerating electrode and a short anode electrostatic weak focus system with high deflection sensitivity and good deflecting quality Deflection group structure; its ultra-fast control circuit requires only a photoelectric switch ramp voltage pulse generator and a specially designed pulse shaping network can be sent with the right time to associate four pairs of positive and negative triangular wave and a pair of positive and negative Single stage voltage pulse. Experiments show that the camera provides six full-frame images in the case of the full exposure time of each image is 80ps, with the exception of 3-4 images between the time interval of 680ps, the rest are 160ps, the dynamic spatial resolution of 5.51 p / mm. The second kind of variable tube picosecond framing camera adopts the shutter-type framing method; the tube of the defocusing tube adopts a traveling wave deflecting system and is made of a stripline structure made of an enhanced MCP, and has an input-output impedance converter and three step waves And shutter pulse sequence by the photoelectric switch circuit and pulse shaping network. The camera offers three full-frame images with a full-exposure time of 660ps per image, 4ns intervals between frames, and a dynamic spatial resolution of 5.5lp / mm. The femtosecond scanning camera uses the MCP enhanced femtosecond sweep tube, a relay lens with negative time distortion and a photoelectric switch scanning circuit without triggering. Experiments show that the camera has a dynamic range of 30 at a time resolution of 500 fs and a dynamic range of up to 500 at a time resolution of 1.2 ps.