廉金属稀磁铜铁合金低温热电偶实验研究

Experimental Investigation of Dilute Magnetic Cu-Fe Low Temperature Thermocouple

稀磁镍铬-铜铁合金热电偶是继镍铬-金铁低温热电偶之后研究出现的一种新的低温热电偶,可适用于4~273 K低温温度范围的测量。本文基于稀磁合金热电偶低温4~273 K分度特性的实验研究。分析计算稀磁铜铁合金磁性杂质在低温下对热电势的影响。应用数理统计随机模型为理论依据,建立＂双介质法＂热电极动态不均匀性的质量分析和控制方法。提高新热电偶电极的品质,促进廉金属稀磁铜铁合金低温热电偶代替贵金属金铁合金热偶的应用发展。

Dilute magnetic NiCr-CuFe thermocouple is a new kind of low temperature thermocouple after the famous NiCr-AuFe thermocouple. In this paper, the theoretical analysis of calculating thermo-emf considered with magnetic impurity＇s interaction is established, which is based on the ex- periments of dilute magnetic copper-iron thermocouple calibration from 4 K to 473 K. Using statistical theory and the ＂double-medium method＂ with the dynamic signal measurement of thermoelectrode inhomogeneous thermo-emf on stochastic process, improves the quality of new thermoclectrode and promotes the application and development for copper-iron thermocouple instead of precious metals of gold-iron thermocouple.