一种针对高分辨磁通门传感器的同步采集系统  

Synchronous acquisition system for the high resolution fluxgate sensor

作　　者：李庆 贾云飞[1] 贺晨宇 Li Qing;Jia Yunfei;He Chenyu(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学机械工程学院

出　　处：《南京理工大学学报》2020年第1期7-14,共8页Journal of Nanjing University of Science and Technology

摘　　要：针对未爆弹探测工作中对数据采集系统提出的同步性与高精度要求,设计了一种适用于磁异常探测设备的多通道同步数据采集系统。系统依据模块化思想构建,结构简单、可扩展性强、成本很低,通过结构优化、利用现场可编程门阵列(Field programmable gate array,FPGA)并行运算的特性,可严格地保证指令同步;采用高达32位分辨率的模数转换器(Analog to digital converter,ADC),并配合数字滤波器、斩波稳零技术,以满足磁探测过程对采样精度要求。样机测试结果表明,其信号测量范围可达±5 V,噪声的有效值低于5μV,相比常用的24位采集卡,精度提升了1倍以上,更适合应用于未爆弹探测领域。Aiming at the synchronization and high precision requirements of the data acquisition system in an unexploded ordnance detection,a multi-channel synchronous data acquisition system which is fit for magnetic detection equipment is designed.The system is built according to the modular idea,its structure is simple,its scalability is strong and its cost is very low.In this system,the parallel operation of field programmable gate array(FPGA)and the structural optimization confirms the instruction’s synchronization.The 32-bits analog to digital converter(ADC)which has the highest resolution at present,digital filter and chopping zero technology make the accuracy requirements satisatory.The prototype test results show that the signal measurement range can reach up to±5 V and the noise is lower than 5μV.Compared with the 24-bits capture card which is commonly used,this system accuracy is more than doubled.The design is more suitable for the field of unexploded ordnance detection.

关 键 词：数据采集系统 现场可编程门阵列 并行采样 数字滤波 

分 类 号：TJ306[兵器科学与技术—火炮、自动武器与弹药工程]