Design of a Negative Temperature Coefficient Temperature Measurement System Based on a Resistance Ratio Model-Reference-Cited by-同舟云学术

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

Published:2024-04-26 Issue:9 Volume:24 Page:2780
ISSN:1424-8220
Container-title:Sensors
language:en
Short-container-title:Sensors

Author:

Liu Ziang¹²^ORCID,Huo Peng¹²,Yan Yuquan¹³,Shi Chenyu¹²,Kong Fanlin¹⁴,Cao Shiyu¹²,Chang Aimin¹,Wang Junhua¹²,Yao Jincheng¹²

Affiliation:

1. 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

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

3. School of Physics Science and Technology, Xinjiang University, Urumqi 830046, China

4. School of Physics and Materials Science, Changji University, Changji 831100, China

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.

Funder

the Tianshan Talent Training Program of Xinjiang, China

Publisher

MDPI AG

Link

https://www.mdpi.com/1424-8220/24/9/2780/pdf

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