Development Of The Electronic System Of The Picosecond Streak Camera

Streak camera is a cutting-edge equipment that detects picosecond,femtosecond or even attosecond ultrafast phenomena.It plays an important role in various major national scientific researches.It is difficult to develop,complicated working principles,difficult to achieve,and technically blocked.Serious,long-term suppression by foreign countries.With the advancement of my country’s scientific research level,the needs of military engineering,the national high-tech and cutting-edge scientific fields,my country’s demand for the development of streak cameras has become increasingly urgent.The structure of a streak camera mainly includes a streak tube,a high-voltage power supply module,an image intensifier and an electronic system.This article mainly describes the development of a picosecond-level streak camera electronic system.After investigating the literature and analyzing the specific needs,the overall plan of the electronic system was formulated.The solution uses STM32F103VET6 as the core controller of the electronic system.The main control unit receives instructions from the host computer through the serial port,distributes them,and sends them to the corresponding instruction completion unit through the SPI connection to realize the control function.The instruction completion unit includes FPGA module,A/D conversion module,D/A conversion module and so on.Among them,the main responsibility of the FPGA module is to use the digital delay method to generate delay and dynamically adjustable pulse width streak camera control signals,including scanning signals,CCD gate control signals,cathode gate control signals,image intensifier gate control signals,and Complete the control of the working mode of the streak camera and monitoring of the working status;the D/A conversion module controls the gain of the image intensifier to enhance the energy of the obtained fringe image to ensure that the fringe image can be captured by the CCD camera;the A/D conversion module is completed The working voltage of the streak camera is monitored to ensure the normal operation of the streak camera.The electronic system control picosecond streak camera developed in this paper achieves the following functions:(1)It has two synchronization modes: internal synchronization and external synchronization.In the external synchronization mode,it supports two trigger modes: light trigger and electrical trigger;(2)It has streak tube cathode gate control Function,the gate control signal can be input through a dedicated interface,or generated inside the electronic system by a scanning trigger signal;(3)The dynamically adjustable cathode gate control signal cooperates with the dynamically adjustable scanning signal to control the scanning and recording time of the streak camera.It can be adjusted in 24 steps;(4)It has three working modes: single scan,repetitive scan and static focus.Compared with the existing research,this research has the following innovations:(1)It realizes a more flexible synchronization mode and trigger mode,so that the streak camera can be applied in more scenes;(2)It realizes a richer scanning gear,so that the same stripe The camera can record both picosecond-level ultra-fast physical phenomena and nanosecond-level optical processes;(3)Integrated cathode gating,image intensifier gating,CCD gating and scanning control,making the electronic system perfect and reducing The module division in the streak camera system is convenient for researchers to use.Finally,this article has carried out the unit function test and the electronic system function test.The test results show that the overall layout design is reasonable and the functions are normal,the electronic system works stably,the performance is good,meets the application demand.