摘要
针对存储式冲击波测试系统在使用中低触发阈值设置不可靠和多点分布测试时频繁改变触发阈值的情况,研究了一种自适应触发门限的冲击波信号测试系统。该系统在分析门限设置与触发概率关系的基础上,采用FPGA作为主控制器,可在上电初始化中自动计算并设置低触发阈值,并结合触发数量积累,形成双门限,保证最大有效触发概率。另外系统采用SD Nand作为存储记录芯片,提高了现有存储式冲击波系统的采样带宽和储存效率。试验证明:该测试系统可稳定触发采集并存储爆炸场微弱冲击波信号,具有采样率高、储存容量大、触发可靠性高的特点。
Aiming at the situation in which medium and low trigger threshold settings are unreliable and trigger thresholds change frequently in a multi-point distributed test when a storage shock wave test system is being used, this paper studies a shock wave signal test system with an adaptive trigger threshold. On the basis of analyzing the relationship between threshold settings and trigger probability, the system uses FPGA as the main controller, which can automatically calculate and set the low trigger threshold in power-on initialization, and combine the accumulation of the number of triggers to form a double threshold to ensure the maximum effective trigger probability. In addition, the system uses SD Nand as the memory record chip, which improves the sampling bandwidth and storage efficiency of the existing storage shockwave system. The test proves that the test system can stably trigger acquisition and storage of weak shock wave signals from an explosion field, which has the characteristics of a high sampling rate, large storage capacity and high trigger reliability.
作者
宋林丽
马竹新
王代华
刘彬
SONG Linli;MA Zhuxin;WANG Daihua;LIU bin(Key Laboratory of Instrument Science and Dynamic Testing under Ministry of Education,North University of China,Taiyuan 030051,China)
出处
《兵器装备工程学报》
CAS
CSCD
北大核心
2023年第2期120-125,共6页
Journal of Ordnance Equipment Engineering
关键词
冲击波
奈曼-皮尔逊准则
信噪比
触发门限
采集存储
shockwave
Naiman-Pearson criterion
signal-to-noise ratio
trigger threshold
acquisition and storage
作者简介
宋林丽(1978-),女,博士,讲师,E-mail:85860399@qq.com。
