Research On High-gain Compact Streak Camera And Its New Intelligent Control System

As a diagnostic instrument with ultra-high temporal and spatial resolution and spectral resolution,streak camera is widely used in basic research fields such as physics,life sciences,and materials science,as well as in national strategic fields such as detonation physics,lidar,and inertial confinement fusion.Aiming at the requirements of airborne lidar for miniaturized,high-sensitivity,high-gain,and high spatiotemporal resolution streak camera,a high-brightness-gain compact streak camera and its new integrated control system are developed.Compared with the general picosecond visible light streak camera,the volume and weight of the camera is reduced by more than 2/3.The selected streak camera adopts the theoretical simulation research of cathode semiconductor and the method of optimizing the process to greatly improve the sensitivity of the cathode.The use of a slit acceleration grid improves the photoelectron transmittance,enhances the photoelectron energy to make the fluorescent screen have a higher luminous efficiency,and optimizes the cathode process to improve the brightness gain.The streak image tube has the characteristics of high sensitivity,large detection field,high brightness gain,and high temporal and spatial resolution.The new control system designed in this paper adopts the method of modularization and underlying function multiplexing structure.Based on STM32single-chip microcomputer,the main control module,power supply module,A/D module,D/A module and digital I/O module are designed respectively.The degree of integration Compared with the previous version,it has been improved by 2.36 times;it supports multi-device compatibility,provides a 24 pins programmable interface,and increases the scanning gear to 12 channels;realizes the control,monitoring,and communication functions of the camera,with a high degree of integration,resistance to Strong electromagnetic interference(EMI)capability and high compatibility.The host computer software designed in this paper is written based on Open CV and realizes human-computer interaction.Finally,the streak tube static test system is used to test the parameters of the streak image tube: the cathode integral sensitivity is 268 μA/lm,the brightness gain is20.1,and the time resolution is 36 ps;Femtosecond laser,F-P etalon,DG645 delayer,oscilloscope,etc.built a dynamic test system for streak camera,and tested the static/dynamic spatial resolution,time resolution,control system function,etc.of the whole machine.The static spatial resolution is higher than 26 lp/mm,the full-screen scanning time is 600 ps,and the functions of control,monitoring and information exchange of the control system are normal.The developed streak camera works well in the laser radar and laser fusion(ICF)picosecond laser targeting experiments.