摘要
研究了铂电阻温度传感器PT100的特性曲线,设计了基于A/D转换器的铂电阻值计算程序,对于正温度范围的二次方程通过优化的解析法求根,对于负温度范围的高次方程分别基于二分法、牛顿法、弦截法进行了分析研究并设计了数值计算程序,在基于PIC18F452微控制器、I2C接口18位精度A/D转换器及PT100传感器搭建的测温系统电路中运行,实现了-200℃～850℃全量程范围内的高精度温度检测与实时显示,其中牛顿法在负温度范围内取得了最高的求解速度。
The characteristic curve of platinum resistance temperature sensor PT100 was studied, and the Platinum electric resistance calculation program was designed which based on A/D Converter, for the quadratic equations of positive temperature range, we extract the root by the optimization of the analytic method, for the equation of higher degree of negative temperature range, we analyzed and designed the numerical calculation program which respectively based on bisection, Newton method and secant method, operating on the temperature measurement system circuit which set up by PIC18F452 microcontroller, I2C interface with 18 bits of precision A/D converter and a PT100 sensor, it achieves high precision temperature measurement and real time display in a full measurement range between -- 200°C -850°C, the Newton method achieved the highest speed of solution in negative temperature range.
出处
《计算机与数字工程》
2012年第5期59-62,71,共5页
Computer & Digital Engineering
关键词
铂电阻
PT100
二分法
牛顿法
切线法
弦截法
数值计算
解析法
A/D转换
温度传感器
platinum resistance, PTIO0, bisection, Newton method, tangent method, secant method, numerical calculation, analyti-cal method, A/D conversion, temperature sensor
