电爆炸探测装置中同步控制的关键技术研究

发布时间：2018-03-24 23:09

本文选题：电爆炸　切入点：等离子体　出处：《西安电子科技大学》2015年硕士论文

【摘要】：对电爆炸过程等离子体密度分布的测量有助于完善电爆炸法制备纳米粉末工艺。本文提出了使用马赫-曾德激光干涉仪测量电爆炸过程中形成等离子体密度分布的方法并详细介绍了同步控制系统设计。为了拍摄到金属丝电爆炸扩展过程图像,控制系统必须快速响应电爆炸信号以及在预设时间点控制激光器与CCD相机同步工作。首先,介绍了马赫-曾德激光干涉仪的系统结构和工作原理,采用电爆炸产生的强光为干涉仪工作触发源并对系统各模块之间的同步控制作了详细分析。然后针对控制系统功能对各部分电路进行研究与设计,使用STC12××系列单片机作为核心控制芯片,提出两种系统拍摄方案:自适应时间基准方法和相机反相工作方法,并对各拍摄方案设计相应的程序。通过PC机软件串口数据通信传输设定延迟时间并采用软件延时方式实现信号的精准延迟。最后,分析了控制电路延迟波形并以拍摄电爆炸一系列干涉图像以及处理之后的等离子体密度分布立体图为例分析了金属丝电爆炸发展过程,给出爆炸膨胀速度平均值。通过对系统测试结果的分析,激光干涉仪系统对电爆炸响应时间达到1us以内,可以拍摄电爆炸金属蒸汽和等离子体整个演化过程的图像,设置时间步长为0.5us,精度200ns。
[Abstract]:The measurement of plasma density distribution in the process of electric explosion is helpful to improve the process of preparing nanometer powder by electric explosion. In this paper, we present a method of measuring plasma density distribution in the process of electric explosion by using Mach Zende laser interferometer. The design of synchronous control system is introduced in detail. The control system must respond to the electric explosion signal quickly and control the laser to work synchronously with the CCD camera at the preset time point. Firstly, the system structure and working principle of the Mach Zende laser interferometer are introduced. The strong light generated by the electric explosion is used as the trigger source of the interferometer and the synchronization control between the various modules of the system is analyzed in detail. Then the circuit of each part is studied and designed according to the function of the control system. Using STC12 脳脳 series single chip microcomputer as the core control chip, two system shooting schemes are put forward: adaptive time reference method and camera reverse working method. The corresponding program is designed for each shooting scheme. The delay time is set through PC software serial port data communication and the precise delay of signal is realized by software delay mode. Finally, The delay waveform of the control circuit is analyzed. Taking a series of interference images of the electric explosion and the stereogram of the plasma density distribution after processing as an example, the development process of the electric explosion of metal wire is analyzed. The average value of explosion expansion velocity is given. By analyzing the test results of the system, the response time of the laser interferometer system to the electric explosion is within 1us, and the image of the whole evolution process of the metal vapor and plasma can be taken. The time step is 0.5 us. the precision is 200ns.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH744.3;TB383

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