二维光幕破片动能测试系统设计

Design of two-dimensional screen fragment kinetic energy measurement system

针对飞行破片目标多、速度快、体积小以及测试环境中光强高、电磁干扰强的测试难点,设计一种非接触式的二维光幕破片动能测试系统。系统以现场可编程门阵列(FPGA)作为核心控制器,利用高精度ADC与NAND Flash存储器采集并存储相互正交的光幕传感器的输出信号,并将数据通过USB接口回读到上位机进行分析,提取出破片的速度与体积信息,进而得到破片的动能。最后通过气枪弹实验对系统进行测试,结果表明:该方案解决传统一维光幕测试系统只能测量旋转对称破片动能的问题,利用二维正交光幕有效地测量非旋转对称破片的动能信息,具有一定的实用价值和应用前景。

Aiming at the difficulties of multi-target, high speed, small volume for flying fragments and high luminous intensity, strong electromagnetic interference in measurement environment, a non-contact two-dimensional screen fragment kinetic energy measurement system is designed. The system takes FPGA as the core controller, making use of high precision ADC and NAND Flash memory chip to acquire and store signal from mutually orthogonal screen senor, and reading the data back to the host computer for analysis through the USB interface, which extract the fragment velocity and volume information, then acquire the information of the kinetic energy of fragments. Based on the air-gun projectile impacting experiment,the results show that this scheme use two- dimensional orthogonal screen to measure kinetic information of non-rotational symmetry fragment effectively, which solves the issues that the traditional one-dimensional screen measurement system can only measure rotational symmetry fragment kinetic energy, and the system has a certain practical value and application prospect.