基于FPGA的小信号高精度采集系统设计
Design of small signal high precision acquisition system based on FPGA
李小龙 1江虹 1罗颖 1陈逸飞 1杨永健1
作者信息
- 1. 西南科技大学信息工程学院,四川绵阳 621000
- 折叠
摘要
针对激光打靶实验中对靶心温度和光照强度的高精度采集需求,以现场可编程门阵列(FPGA)为核心,实现了一种多路高精度采集系统.系统通过对信号源输出的模拟K型热电偶的信号进行采集,将采集的信号作为样本,估计出每个通道的增益误差和偏移量,借助最小二乘法得到每个通道修正误差所需要的系数,最后再通过配置AD7768 实现对误差的修正.实验结果表明:在修正前增益误差为0.2078%,修正之后增益误差为0.0027%,采用修正方法后,实现采集误差在10 μV以内,有效地提高了系统对微小信号的采集精度.
Abstract
Aiming at the high-precision acquisition requirements of the temperature and light intensity of the bullseye in the laser targeting experiment,field programmable gate array(FPGA)is taken as the core and a multi-channel high-precision acquisition system is implemented.The system collects the analog K-type thermocouple signal output by the signal source,takes the collected signal as a sample,estimates the gain error and offset of each channel,and uses the least squares method to obtain the required coefficient for error correction for each channel.Finally,the error is corrected by configuring AD7768.The experimental results show that the gain error before correction is 0.2078%,and the gain error after correction is 0.0027%.After the correction method is adopted,the acquisition error is achieved within 10 μV,which effectively improves the acquisition precision of the system for small signals.
关键词
现场可编程门阵列/高精度采集/AD7768/数据修正Key words
field programmable gate array(FPGA)/high precision acquisition/AD7768/data correction引用本文复制引用
基金项目
四川省科技计划(2021YJ0097)
西南科技大学博士基金(20zx7122)
出版年
2024
NETL
NSTL
万方数据