热电偶快速高精度测温算法  

Fast high-precision temperature measurement algorithm for thermocouple

作　　者：闫鑫[1] 王晓娜[1] 丁渊明[2] 杨遂军[1] 叶树亮[1] 

机构地区：[1]中国计量学院工业与商贸计量技术研究所,浙江杭州310018 [2]浙江省计量科学研究院,浙江杭州310013

出　　处：《传感器与微系统》2015年第3期140-143,共4页Transducer and Microsystem Technologies

基　　金：国家质检公益性行业科研专项项目(201310102)

摘　　要：为了满足热电偶测量温度过程中对运算速度和计算精度的要求,设计了一种快速高精度的测温算法。利用方程求根的思想,结合线性多项式拟合法与查表法,确定温度区间;同时引入秦九昭算法简化复杂分度公式;最后利用二分法精确求解。实验表明：在以ATmega128为控制核心,时钟为16MHz的硬件平台下,算法在0~1000℃可以达到±0.005℃的精度,相对传统求根法,运算时间由320ms减小到80ms。In order to meet requirements for calculation speed and precision of operation in temperature measuring process of thermocouple,a fast and high-precision temperature measurement algorithm is designed. Use idea of Equation Root,combine linear polynomial fitting method with look-up table method to determine temperature interval; and introduces Horner algorithm to simplify complicated indexing formulas; finally,use dichotomy to solve accurately. Experiments show that on hardware platform,which uses ATmega 128 as control core with 16MHz clock,the algorithm can achieve precision of ± 0. 005 ℃ in the range of 0 ~ 1 000 ℃,and compared with traditional root finding method,computation time is reduced from 320ms to 80 ms.

关 键 词：热电偶 快速高精度 多项式拟合法 二分法 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]