一种基于基本样条插值的热电偶特性曲线拟合方法

A Fitting Method for the Thermocouple Characteristic Curve with Cardinal Spline

由于热电偶的热电动势特性曲线是非线性的 ,一般都需要用高阶多项式进行拟合。但在计算机温度测控系统中 ,有必要寻求简化的E -T拟合公式替代高阶多项式公式 ,以提高计算机测控系统的运行速度和控制精度。文中介绍了一种新的使用 3次基本样条曲线拟合的方法 ,可以得到较小的替代误差。

As the thermocouple characteristic curve is nonlinear, high-order polynomials is usually used to fit the characteristic curve, but it is necessary to use lower-order polynomials in a computer measuring and control system to enhance speed of computation and control quality. In this paper, we describe a fitting method with the cubic cardinal spline,in which the results show a smaller error can be acquired.