高精度多段智能爆速仪的设计及应用

An Intelligent High-precision Detonation Velocity Instrument Based on Embedded System

为解决传统测时仪、爆速仪精度低的问题,提高国防测试技术领域弹药爆速测试的准确度,设计了一种基于嵌入式系统的高精度智能爆速仪。该仪器可用光纤传感器测量炸药、导爆索、传爆管等爆轰波传播时间和速度,使用通-断靶测量弹丸、破片等速度。仪器包括三大模块:以光纤传感器或通-断靶和光电探测器为前端的信号采集模块;利用CPLD完成计数器、自动检测电路、数据选通及缓存的计时模块;以嵌入式系统为基础的数据输入输出、计算和LCD显示的处理模块。仪器采用200 MHz晶振,通过提高采样频率来提高计时精度。通过导爆索爆速实验,分析得出系统精度优于1%。结果表明:该系统极大的提高了火工品爆速测量的精度。

In order to improve the precision characteristic of detonation velocity instrument and enhance the accuracy property of ammunition speed test in defense field,a high-precision intelligent detonation velocity instrument based on embedded system and fiber optics is designed and tested. It consists of three modules that are fiber sensor,time module and the 200 MHz crystal. The fiber optic sensors and photo-detectors are designed for the signal acquisition. The timing module includes the counter,automatic detection circuit,data strobe and cache that based on CPLD. The function of the data input and output,the computing and the control of LCD display are performed by the embedded system. The sampling frequency is increased to enhance the timing accuracy with the adopting the200 MHz crystal. It can be used to measure the time and speed of explosives,detonating cord,detonators and other detonation wave propagation. The velocity of projectile and fragment can also be measured by its pass-off target function. The detonation velocity property to detonating cord is measured experimentally. The experimental results show that its velocity measurement accuracy could be better than 1%,which is better than other types of explosive detonation velocity instruments.