基于AD7173的多通道数据采集高速存储系统  

Multi-channel data collection and high-speed storage system based on AD7173

作　　者：牛婉琳 刘磊 甄国涌[1] 焦新泉[1] 李辉景[1] 宋坤涛 NIU Wanlin;LIU Lei;ZHEN Guoyong;JIAO Xinquan;LI Huijing;SONG Kuntao(Key Laboratory of Instrument Science and Dynamic Measurement,Ministry of Education,North University of China,Taiyuan 030051,China;Beijing Institute of Control and Electronic Technology,Beijing 100018,China)

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051 [2]北京控制与电子技术研究所,北京100018

出　　处：《中国测试》2018年第3期149-152,共4页China Measurement & Test

摘　　要：为解决测试系统中弹内空间狭小、无法同时容纳多套传统数据采集系统的问题,设计基于AD7173的多通道数据采集高速存储系统,实现对多传感器(四轴MEMS加速度计、四轴MEMS陀螺仪、三轴地磁传感器和温度传感器)的高精度采集存储。选用∑-Δ型高精度模数转换芯片AD7173实现对多路传感器信号的模数转换;在转换时实时监测数据的准确性,并通过芯片的RDY引脚作为STM32外部中断来判断是否转换完成,以此来实现高精度的数据采集,并通过流水线设计实现数据的高速存储。试验结果表明:输入角速率与敏感角速率误差控制在±0.0017°/s以内。对多个传感器的采集验证表明该数据采集高速存储系统能够实现对多通道信息的高精度采集存储,具有一定的工程应用价值。In order to solve the problem that the test system has a small space and it is to unable hold several sets of traditional data acquisition system at a same time,a multi-channel acquisition data and high-speed storage system based on AD7173 is designed to realize the high-precision data acquisition and storage of multi sensors(four-axis MEMS acceler ometer,MEMS four-axis gyroscope,three-axis geomagnetic sensor and temperature sensor).∑一Δhigh modulus-precision conversion chip AD7173 is selected to realize the modulus conversion of signals of multichannel sensors.During conversion,the correctness of the data is monitored in real time and RDY the pin on the chip is used as the external interrupt of the STM32 to determine whether conversion the is finished,so as to achieve high-precision data acquisition and realize the data high-speed storage through line design.The experimental results show that the error of the input rate angular and the sensitive angular rate is controlled within±0.001 7 0/s.The data acquisition verification and of a number of sensors show that the data acquisition and high-speed storage can system achieve high-precision acquisition and storage of multi-channel data and it has a value certain in engineering applications.

关 键 词：高精度数据采集 高速数据存储 多通道 MEMS传感器 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]