远程多通道温度高精度数据采集系统设计  

Development of Multichannel Temperature Data Acquisition System

作　　者：李东明[1] 蔡鄂[1] 王典洪[2] 王永涛[1] 胡亚斌[1] 

机构地区：[1]中国地质大学信息实验中心 [2]中国地质大学机电学院

出　　处：《电子技术（上海）》2014年第3期67-70,共4页Electronic Technology

基　　金：湖北省自然科学基金(2010CDA007)湖北省自然科学基金(2011CDB343);中央高校基本科研业务费专项资金(CUGL120278)

摘　　要：根据远程网络应用环境下的温度测量需求,设计出一种基于以太网的远程多通道高精度温度数据采集系统。系统由下位机和远程主机构成,下位机硬件主要由温度传感器PT1000、仪用放大器INA128构成的调理电路、A/D转换器Max1300、32位微控器PIC32MX795以及物理网卡芯片构成,上位机为远程PC机。在恒流源的激励下,PT100电压的变化依赖温度的变化,经信号调理、16bitA/D转换后由PIC32MX795求解出高次方程的数值根即温度值,然后通过以太网发送给远程主机进行处理。系统充分利用PIC32MX795的计算性能,利用牛顿法直接寻找高次方程的数值根即为温度值,其测量精度优于0.1℃。系统长期工作稳定。For the needs of multi-point temperature measurement in remote application environment, a remote multi-channel temperature data acquisition system is designed. The system consists of a measurement system and a remote PC. The System hardware mainly consists of the temperature sensor PT1000, the conditioning circuit composed of instrument amplifier INA128, A/D converter MAX1300, 32 bit microcontroller PIC32MX795 as well as the physical network chip; software LabVIEW is running in the remote PC. Driven by the weak constant current source, the voltage on the PT1000 is changed with the temperature. The voltage is converted by the Maxl300 after amplified, and then the data are transmitted to remote host computer through Ethernet for display and processing. On the basis of fully utilizing the computing performance of 32-bit MCU PIC32MX795, our system can directly find the numerical root of the temperature equations using Newton method, and then calculate the temperature value. The comparison between the experiments results and standard platinum thermometer resistance indicate that the measurement accuracy of our system is better than the 0.10℃.

关 键 词：LABVIEW 数据采集 32位单片机 TCP IP 热电偶 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]