基于电阻比模型的负温度系数温度测量系统设计

Design of a Negative Temperature Coefficient Temperature Measurement System Based on a Resistance Ratio Model.

作者信息

Liu Ziang, Huo Peng, Yan Yuquan, Shi Chenyu, Kong Fanlin, Cao Shiyu, Chang Aimin, Wang Junhua, Yao Jincheng

机构信息

State Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of CAS, 40-1 South Beijing Road, Urumqi 830011, China.

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.

出版信息

Sensors (Basel). 2024 Apr 26;24(9):2780. doi: 10.3390/s24092780.

DOI:10.3390/s24092780

PMID:38732886

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11086062/

Abstract

In this paper, a temperature measurement system with NTC (Negative Temperature Coefficient) thermistors was designed. An MCU (Micro Control Unit) primarily operates by converting the voltage value collected by an ADC (Analog-to-Digital Converter) into the resistance value. The temperature value is then calculated, and a DAC (Digital-to-Analog Converter) outputs a current of 4 to 20 mA that is linearly related to the temperature value. The nonlinear characteristics of NTC thermistors pose a challenging problem. The nonlinear characteristics of NTC thermistors were to a great extent solved by using a resistance ratio model. The high precision of the NTC thermistor is obtained by fitting it with the Hoge equation. The results of actual measurements suggest that each module works properly, and the temperature measurement accuracy of 0.067 °C in the range from -40 °C to 120 °C has been achieved. The uncertainty of the output current is analyzed and calculated with the uncertainty of 0.0014 mA. This type of system has broad potential applications in industry fields such as the petrochemical industry.

摘要

本文设计了一种采用负温度系数（NTC）热敏电阻的温度测量系统。微控制单元（MCU）主要通过将模数转换器（ADC）采集的电压值转换为电阻值来进行操作。然后计算温度值，数模转换器（DAC）输出与温度值呈线性关系的4至20 mA电流。NTC热敏电阻的非线性特性带来了一个具有挑战性的问题。通过使用电阻比模型，在很大程度上解决了NTC热敏电阻的非线性特性。通过将NTC热敏电阻与霍格方程拟合，获得了高精度。实际测量结果表明，各模块工作正常，在-40℃至120℃范围内实现了0.067℃的温度测量精度。分析并计算了输出电流的不确定度，其不确定度为0.0014 mA。这种类型的系统在石油化工等工业领域具有广泛的潜在应用。