基于FPGA的多路极低温数据测量系统设计  

Design of multi-channel extremely low temperature data measurement system based on FPGA

作　　者：梁西银[1] 倪波波 颜昌林 刘昊 郭贝 马丽萍 LIANG Xiyin;NI Bobo;YAN Changlin;LIU Hao;GUO Bei;MA Liping(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,China;Huayu Branch,Lanzhou Vacuum Equipment Co Ltd,Lanzhou 730000,China)

机构地区：[1]西北师范大学物理与电子工程学院,甘肃兰州730070 [2]兰州真空设备有限责任公司华宇分公司,甘肃兰州730000

出　　处：《传感器与微系统》2019年第11期100-103,共4页Transducer and Microsystem Technologies

基　　金：甘肃省科技厅重大专项项目(1602GKDA015)

摘　　要：介绍了一种基于现场可编程门阵列(FPGA)的极低温段温度数据测量系统的设计与实现方法。采用较宽测温量程(1.2 ~325 K)的四线制铑铁热电阻传感器RF50-SQ,提高了系统的抗辐射和抗干扰能力;采用FPGA芯片的电路设计实现了并行、高速、多通道的数据处理与串行接口通信。对传感器原始分度表的数值预处理以及使用恰当的查表算法降低了FPGA内部电路设计的复杂度,提高了采样速率与测量精度。该测量系统在真空环境模拟设备的现场应用试验中,各项功能与性能表现较好,为低温试验技术提供了一种新的测量方法。The design and implementation of a temperature data acquisition system based on field programmable gate array(FPGA)is introduced. In the design,a four-line Rhodium(Rh)iron thermistor sensor RF50 - SQ with wide temperature measurement range of 1.2 ~ 325 K is used to improve the anti-radiation and anti-interference ability of the system,and the parallel,high-speed,multi-channel data processing and serial interface communication are realized by using the circuit design of FPGA chip.The numerical preprocessing of the original reference table of the sensor and the proper interpolation algorithm reduce the complexity of the internal circuit design of FPGA,and improve the sampling rate and measurement precision.In the field application test of the vacuum simulator,each function and characteristics show good.It provides a new measuring method for the low temperature test technology.

关 键 词：极低温测量 铑铁热电阻 现场可编程门阵列(FPGA) 分度表 插值算法 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TP331[自动化与计算机技术—控制科学与工程]