霍尔探头低温标定装置导冷结构热性能的数值模拟  

Numerical simulation of cold conduction structure thermal performance in Hall probe cryogenic calibration system

作　　者：钟逸[1,2] 张伟[1] 张继东[1] 王淑华[1] 何永周[1] 周巧根[1] 

机构地区：[1]中国科学院上海应用物理研究所嘉定园区,上海201800 [2]中国科学院大学,北京100049

出　　处：《核技术》2014年第4期1-5,共5页Nuclear Techniques

基　　金：国家自然科学基金项目(No.11175238)资助

摘　　要：霍尔探头低温标定装置是对霍尔探头进行低温下磁测性能标定的实验工具。标定装置内,探头的导冷结构的温度分布以及低温下的冷缩变形对霍尔探头标定的准确性有直接的影响。本文运用有限元模拟软件对霍尔探头低温标定装置的导冷结构进行了稳态热分析和冷缩变形分析;对低温下霍尔探头的焦耳效应进行了模拟,研究了霍尔探头的焦耳效应对其标定温度的影响。当制冷机二级冷头温度为4.42 K时,霍尔探头温度模拟结果为6.75 K,霍尔探头轴向冷缩量模拟结果为1.11 mm,实验结果霍尔探头温度6.55 K,模拟结果可靠。Background： The cryogenic calibration system of Hall probe is an important tool for high precision magnetic measurement at low temperature. Purpose： In order to setup the calibration system, simulations are performed to study the temperature distribution and thermal deformation of the conduction components which have a direct impact on the Hall probe calibration. Methods： Finite element method was used to the steady thermal analysis and cold deformation analysis. Joule effect of the Hall sensor at low temperature was simulated, and temperature differences from the Joule effect were then figured out. Results： When the temperature of the secondary cold head is 4.42 K, the simulated temperature of the Hall probe is 6.75 K, and the simulation result of Hall probe axial deformation is 1.11 mm. Experimental result of the temperature of hall probe is 6.44 K. Conclusion： The simulation result is reliable and can provide the basis for Hall probe temperature correction.

关 键 词：霍尔探头 低温标定 焦耳效应 有限元模拟 

分 类 号：TL503[核科学技术—核技术及应用]