测控技术2018，Vol.37Issue(5)：101-103,3.
基于PT100的高精度温度测量电路的设计
Design of a High-Precision Temperature Measuring Circuit Based on PT100
摘要
Abstract
The temperature measurement accuracy of the conventional four-wire constant current source driven temperature measurement system is very low due to the interference factor of temperature current drift,it is difficult to exceed the order of 0.1 C.An improved four-wire high-precision temperature measurement circuit driven by constant current source was designed based on PT100.By sampling the ratio of high precision resistance voltage of high temperature stability coefficient to platinum resistance voltage,the current variation of constant current source due to temperature drift and other factors were eliminated,so that the output voltage ratio has a good linear relationship with the platinum resistance.The signal was sampled by LTC2492A/D converter and transmitted to ATMEGA32 which processed,stored and displayed the data.The experimental results show that the temperature measurement accuracy and stability of the circuit can reach within 5‰,which is consistent with the theoretical value.关键词
PT100/温度测量电路/高精度/四线制Key words
PT100/temperature measurement circuit/high precision/four-wire分类
信息技术与安全科学引用本文复制引用
顾吉林,刘淼,耿杨,汤宏山,王聆语,于月,吴茜..基于PT100的高精度温度测量电路的设计[J].测控技术,2018,37(5):101-103,3.基金项目
国家自然科学基金项目(11547234) （11547234）
辽宁省教育厅科学研究一般项目(L2015286) （L2015286）
辽宁师范大学教改项目(LS2015063) （LS2015063）
大学生创新创业训练项目(201610165000050,201710165000104) （201610165000050,201710165000104）
