面向Pt100铂电阻的高精度多路测温系统  

Multichannel high-precision temperature measurement system based on Pt100 platinum resistance

作　　者：徐莉振[1] 鲍敏[1] 

机构地区：[1]浙江理工大学机械与自动控制学院,浙江杭州310018

出　　处：《机电工程》2013年第1期65-68,72,共5页Journal of Mechanical & Electrical Engineering

基　　金：国家自然科学基金资助项目(51106141)

摘　　要：针对Pt100铂电阻多路测温系统存在精度低、硬件电路设计重复等问题,设计了一种面向Pt100铂电阻的高精度多路测温系统。以Pt100为温度传感器、Atmega16L为控制核心,通过模拟开关CD4052组合进行了多路测量控制,运用滤波、放大等信号调理电路以及16位高采样精度的A/D转换器ADS8320,以查表结合软件补偿的方法进行了非线性补偿,从而实现了高精度测温;同时,对各组成部分的误差来源进行了分析,计算出了测温系统的综合误差。研究结果表明,该系统具有测量精度高、稳定性好、可扩展性强等特点。Aiming at the problems of low-precision measurement and repeating hardware circuit design in the Pt100 platinum resistance t of temperature, a design of multichannel high-precision temperature measurement system based on Pt100 platinum resistance has been introduced. The platinum resistance Pt100 was used as temperature sensor and the Atmega16L was chosen as the controlling core, the control of muhichannel measurement has been realized by a group of analog switch CD4052. In order to realize high precision temperature measurement, the signal processing circuit of filtering, amplification, 16-bit high-speed analog-to-digital converter ADS8320 was used. The method combining with look-up table and software compensation was used to make nonlinearity compensation. At the same time, on the part of the error source had been analyzed, then the system synthesis error was calculated. The results indicate that the measurement system has the advantages of high precision,good stability and strong scalability.

关 键 词：PT100 高精度 多路测温系统 ATMEGA16L 

分 类 号：TH811[机械工程—仪器科学与技术]