基于K型热电偶的高精度测温装置设计  

Design of High-precision Temperature Measurement Device Based on K-type Thermocouple

作　　者：王晓丹[1] 孟令军[1] 文波[1] 张晓春[1] 

机构地区：[1]中北大学电子测试技术国家重点实验室仪器科学与动态测试教育部重点实验室,太原030051

出　　处：《自动化与仪表》2014年第11期12-15,共4页Automation & Instrumentation

基　　金：国家自然科学基金资助项目(51275492)

摘　　要：针对在热试验过程中K型热电偶测温存在非线性误差的问题,基于热电偶测温原理设计了一种高精度测温装置。装置以STM32单片机作为主控芯片,采用高精度测温专用AD芯片ADS1148,通过冷端补偿、分段拟合等措施来提高测温精度。试验结果表明,该装置在-50℃-500℃范围内,测温精度能达到±0.1℃,具有体积小、精度高、性能可靠等优点,可广泛应用于工业生产和军事领域的高精度测温场合。Aiming at problems of K-type thermocouple nonlinearity error in the heat experiment,a high precision temperature measurement device based on the principle of thermocouple was designed.The device choose STM32 microcontroller as the master chip,use a dedicated AD chip ADS1148 and through cold junction compensation,piecewise fitting and other measures to improve the temperature measuring precision.Test result show that the precision of temperature measurement can reach ±0.1 ℃ in the range of -50℃-500 ℃. Device has characters of small size,high accuracy ,high stability and reliability ,which can be widely used in high precision temperature measurement of industrial production and military field.

关 键 词：热电偶 高精度 ADS1148 测温 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]