Methods for the Linearisation of the Transfer Function of Thermoresistive Transducers

Authors

DOI:

https://doi.org/10.31861/sisiot2024.2.02012

Keywords:

temperature, temperature measurement, linearisation, RTD

Abstract

The article describes digital and analogue methods for linearising the conversion function of thermoresistive transducers, with a detailed analysis of analogue methods. Analogue methods for linearising bridge circuits and measurement circuits based on passing a reference current through a resistance temperature detector (RTD) are considered. Linearisation of bridge circuits is based on the formation of the compensating supply voltage of the bridge circuit, which depends on the change in the measured temperature. When using the measurement method based on passing a reference current through an RTD, nonlinearity compensation is achieved by changing the conversion coefficient of the measuring signal or passing an additional current through the RTD, which linearly depends on the value of the RTD’s voltage change (measured temperature value). When passing an additional compensation current through the RTD, the nonlinearity error is not grater than 0.1°C in the range of 0…800°C, and the schematic diagram of the measuring transducer contains a minimum number of elements, which allows to increase its reliability. In general, the choice of a linearisation method depends on the requirements for accuracy, operation rate and resource limitations of the measuring system.

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Author Biographies

  • Les Hotra, Lviv Polytechnic National University

    Graduated from Department of Applied Mathematics, Lviv Polytechnic National University (Ukraine). He is currently a postgraduate student at Lviv Polytechnic National University. His areas of scientific interest cover mathematical modelling and electronics including biomedical devices.

  • Oksana Boyko, Danylo Halytsky Lviv National Medical University

    Doctor of Technical Sciences. She is currently a Head of the Medical Informatics Department of Danylo Halytsky Lviv National Medical University (Ukraine). Her areas of scientific interest cover temperature measurement, mathematical modelling, biomedical devices and medical information systems. She is the author of over 200 scientific and methodological works.

  • Ihor Helzhynskyy, Lviv Polytechnic National University

    Doctor of solid-state electronics, professor of the Department of Electronic Engineering of Lviv Polytechnic National University. He has been participated in numerous Ukrainian and international projects related to materials science, engineering, in particular organic and gibrid light-emitting devices for organic electronics. His research area focuses on WOLED, PhOLED, QLED and electronics.

  • Hryhorii Barylo, Lviv Polytechnic National University

    Doctor of Technical Sciences. He was the Head of the Microprylad production enterprise in Lviv. He is currently a professor of the Department of Electronic Engineering of Lviv Polytechnic National University. His research activity is focused on the problem of the use of impedance spectrometry in sensor technology, materials science, biological and medical research.

  • Tetyana Kolach, Danylo Halytsky Lviv National Medical University

    Lecturer of the Medical Informatics Department of Danylo Halytsky Lviv National Medical University (Ukraine). Areas of scientific interest cover mathematical modelling, biomedical devices and medical information systems. Author of over 50 scientific and methodological works.

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Published

2024-12-30

Issue

Vol. 2 No. 2 (2024)

Section

Articles

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Copyright (c) 2024 Security of Infocommunication Systems and Internet of Things

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This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

[1]
L. Hotra, O. Boyko, I. Helzhynskyy, H. Barylo, and T. Kolach, “Methods for the Linearisation of the Transfer Function of Thermoresistive Transducers”, SISIOT, vol. 2, no. 2, p. 02012, Dec. 2024, doi: 10.31861/sisiot2024.2.02012.