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Computational compensation of systematic errors accompanying non-equilibrium thermocouple measurements
International Journal of Thermal Sciences ( IF 4.5 ) Pub Date : 2021-05-19 , DOI: 10.1016/j.ijthermalsci.2021.107049
Václav Kočí , Jan Kočí , Jiří Maděra , Jiří Litoš , Vojtěch Pommer , Lenka Scheinherrová , Robert Černý

Application of thermocouple sets of various complexity as temperature sensors in porous materials can be accompanied with systematic errors related to the very high differences between the thermal conductivities of thermocouple forming metals and measured samples. Since the higher measurement uncertainties can then make some presumed utilizations of measured temperature fields questionable, this paper introduces an approach which can overcome this drawback. Using a computational model, it is able to separate parameters of particular constituents of the sample-thermocouple system that helps to filter out the systematic errors by means of extracting the pure material parameters. The applicability of the approach is demonstrated on a one-sided high-temperature heating experiment, in which the temperature field in a sample is monitored and subsequently used for the determination of thermal conductivity. The effect of the computational compensation procedure is found to be very significant. The up to 64 °C temperature differences between the raw data and corrected values can cause systematic thermal conductivity errors of up to 46%. Depending on temperature, the corrected thermal conductivity is then by up to 0.89 W m−1 K−1 lower.



中文翻译:

伴随非平衡热电偶测量的系统误差的计算补偿

在多孔材料中将各种复杂程度的热电偶组用作温度传感器时,可能会出现系统误差,这与形成热电偶的金属和所测样品的热导率之间存在非常高的差异有关。由于较高的测量不确定性可能会使所测得的温度场的某些利用产生疑问,因此本文介绍了一种可以克服此缺点的方法。使用计算模型,它能够分离出样品-热电偶系统特定组成部分的参数,这有助于通过提取纯材料参数来滤除系统误差。在单面高温加热实验中证明了该方法的适用性,其中监测样品中的温度场,然后用于确定热导率。发现计算补偿程序的效果非常显着。原始数据和校正值之间高达64°C的温差会导致高达46%的系统导热系数误差。根据温度,校正后的热导率最高可达0.89 W m-1  K -1低。

更新日期:2021-05-20
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