精确测量温度的一种新方案

A New Method of Measuring Temperature Accurately

PN结正向电流随正向电压按指数规律变化,且在不同温度下其变化曲线不同.以此理论为基础,从实验上对TIP31型硅三极管的电压-温度关系进行定标,并进一步设计出一种精确测量物体温度新方案.借助Matlab软件,采用麦夸特算法求解非线性回归方程优化模型,结合常规最小二乘法对未知参数预测并作为麦夸特迭代函数的初始值,对此方案测量温度的精确度进行了验证.

The forward current in PN junction is changing with forward voltage according to the index law, and its curves are not the same at different temperatures. Based on this theory, the relationship between the voltage and the temperature of silicon triode TIP31 can be calibrated by experiments, and it is possible to design a new method to measure the temper- ature of object accurately. Using Matlab software, combined with Levengerg-Marquardt iteration algorithm to solve the op- timization model of nonlinear regression equation, od and take it as the initial values of Levengerg- ture measurements. and predict the unknown parameters by conventional least square meth- Marquardt function, this method validated the accuracy of the tempera-