Li Jiyun, Pei Hongxing, Kochan Orest, Wang Chunzhi, Kochan Roman, Ivanyshyn Alla
College of Modern Information Technology, Henan Polytechnic, Zhengzhou 450046, China.
Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450003, China.
Sensors (Basel). 2024 Dec 14;24(24):7991. doi: 10.3390/s24247991.
This study contributes to improving the accuracy of temperature measurements with a platinum resistance temperature detector (RTD) by proposing techniques to mitigate the error due to self-heating by the operating current. An assessment of the measurement errors of the platinum RTD was carried out to study ways to improve their accuracy. High accuracy can be achieved by individual calibration using a voltage divider circuit to measure resistance, the substitution method, and the transitional measure. It was shown that each of these approaches offers potential improvements in the accuracy of temperature measurements using RTDs. However, one of the genuine limitations is the error due to heating the RTD by the operating current. To address this, both linear and nonlinear methods for correcting the error due to heating by the operating current were studied. This paper examines how these methods can be applied to mitigate the influence of self-heating on measurement accuracy. Moreover, the residual errors associated with these methods of correction were estimated. The analysis showed that while these methods can reduce the errors significantly, there remain limitations below which it is not possible to mitigate the error.
本研究通过提出减轻工作电流自热误差的技术，有助于提高铂电阻温度探测器（RTD）温度测量的准确性。对铂RTD的测量误差进行了评估，以研究提高其精度的方法。使用分压器电路测量电阻的单独校准、替代法和过渡测量法可实现高精度。结果表明，这些方法中的每一种都为使用RTD的温度测量精度提供了潜在的改进。然而，一个真正的限制是工作电流加热RTD所导致的误差。为了解决这个问题，研究了用于校正工作电流加热误差的线性和非线性方法。本文研究了如何应用这些方法来减轻自热对测量精度的影响。此外，还估计了与这些校正方法相关的残余误差。分析表明，虽然这些方法可以显著降低误差，但仍存在局限性，无法将误差降至更低。
