Experimental study on temperature signal difference under high intensity magnetic field

doi:10.11949/0438-1157.20190545

Abstract

Abstract:

Due to the magnetoresistance effect, the temperature signal was different from the real one under high intensity magnetic field. Accurate temperature measurement is the key for preparation of materials or the measurement of material properties under magnetic environment. In this work, the temperature signal of E-type thermocouple and a PT100 platinum resistor were measured, with temperature range from -190℃ to 700℃ and magnetic field range from 0 to 5 T. The results show that, the temperature signal increases with magnetic field intensity increasing. However, the difference of temperature signal decreased with increasing heat power. Furthermore, the temperature rate was curve relation with temperature difference under different magnetic field.

Key words: differential scanning calorimeter, temperature measurement, high intensity magnetic field, thermocouple, platinum resistance thermometer, calibration technology

摘要：

由于磁致电阻效应的存在，使得测温器件的信号在磁环境中会产生偏差，而准确的温度测量结果是材料制备或者磁环境下材料特性测量的基础。针对这一问题，对E型铠装热电偶和铠装Pt100铂电阻3种测温元件，在0~5 T磁场环境中，-190~700℃温度范围的测温信号的偏差进行了实验研究。结果显示，2种器件的温度信号的整体趋势是随着磁场强度的上升而升高的，但是随着功率的增加，磁场变化引起的温度偏差逐渐减小，同时，升温速率与不同磁环境温差之间存在二次曲线关系。为今后磁环境下温度信号的校正技术提供了基础的数据支持和理论指导。

关键词: 差热分析仪, 温度测量, 强磁场, 热电偶, 铂电阻温度计, 校正技术

CLC Number:

O 353.5

Qiu ZHONG,Liping YANG,Ye TAO,Caiyun LUO,Zijun XU,Wenbing WANG. Experimental study on temperature signal difference under high intensity magnetic field[J]. CIESC Journal, 2019, 70(S2): 349-355.

钟秋,杨莉萍,陶冶,雒彩云,徐子君,汪文兵. 磁环境温度测量信号偏差实验研究[J]. 化工学报, 2019, 70(S2): 349-355.

Figures/Tables 12

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参数	E型	Pt100
结构	铠装	铠装
正极	镍铬10合金	铂
负极	铜镍合金	铂
测温范围	-200~900℃	-200～850℃
直径	2 mm	2 mm
精度等级	Ⅱ级/B级	Ⅱ级/B级
允差范围	0.0075\|t\|	0.30+0.005\|t\|

参数	E型	Pt100
结构	铠装	铠装
正极	镍铬10合金	铂
负极	铜镍合金	铂
测温范围	-200~900℃	-200～850℃
直径	2 mm	2 mm
精度等级	Ⅱ级/B级	Ⅱ级/B级
允差范围	0.0075\|t\|	0.30+0.005\|t\|

序号	目标温度/℃	测温炉体
1	~100	高温模块
2	~300	高温模块
3	~700	高温模块
4	~-190	低温模块
5	~-160	低温模块

序号	目标温度/℃	测温炉体
1	~100	高温模块
2	~300	高温模块
3	~700	高温模块
4	~-190	低温模块
5	~-160	低温模块

参数	测温元件	磁场方案
		1		2		3
		0	5 T	0	5 T	0	5 T
最高温度/℃	E	103.72	103.82	307.91	308.01	708.09	708.92
最高温度/℃	PT100	88.21	88.30	275.56	275.67	652.27	653.39
磁场引起温差/℃	E	0.10		0.10		0.83
磁场引起温差/℃	PT100	0.09		0.11		1.12