气压涨落对低温超导SQUID工作特性影响  

Influence of air pressure fluctuation on low temperature superconducting SQUID operating characteristics

作　　者：董丙元 包苏新 邱隆清[1,2] 张树林[1,2] 荣亮亮[1,2] 伍俊[1,2] DONG Bingyuan;BAO Suxin;QIU Longqing;ZHANG Shulin;RONG Liangliang;WU Jun(State Key Laboratory of Materials for Informatics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China;Center of Excellence in Superconducting Electronics(CENSE),Chinses Academy of Sciences,Shanghai 200050,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院,上海微系统与信息技术研究所,信息功能材料国家重点实验室,上海200050 [2]中国科学院超导电子学卓越创新中心,上海200050 [3]中国科学院大学,北京100049

出　　处：《传感器与微系统》2020年第4期20-22,30,共4页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(61701486,61873256);上海市科委科研计划资助项目(17511103300)。

摘　　要：针对航空超导全张量磁测量系统中低温超导量子干涉器件(LTS-SQUID)输出因气压涨落存在基线漂移的现象,设计了气压稳定装置以控制杜瓦内部气压,并研究了在加入该装置后SQUID的工作特性。该装置可在102~122 kPa范围内实现杜瓦内气压线性调节,且稳定气压后杜瓦内气压波动小于50 Pa。实验结果表明:工作在液氦温度的SQUID输出基线漂移与杜瓦内气压变化正相关;加入气压稳定装置可保证液氦温度波动小于0. 5 mK。同时,由实验分析,本系统中SQUID的磁通-温度系数■Φ/■T约为1. 23Φ0/K。Aiming at the baseline drift of the low temperature superconducting quantum interference device( LTS-SQUID) output in the airborne superconducting full-tensor magnetic measurement system due to the fluctuation of air pressure,an air pressure regulator is designed to control the Dewar’s internal pressure and SQUID operating characteristics after applying the device is studied. The pressure regulator can realize the linear adjustment of the Dewar’s internal pressure in the range of 102~ 122 kPa,and the pressure fluctuation inside the Dewar is less than 50 Pa after the pressure stabilization. The experimental results show that the baseline drift of SQUID output working at liquid helium temperature is positively correlated with the change of pressure inside Dewar. The fluctuation of liquid helium temperature can be guaranteed to be less than 0. 5 mK by applying the pressure regulator. At the same time,the magnetic flux and temperature coefficient ■Φ/■T of SQUID in this system is about 1. 23 Φ0/K by experimental analysis.

关 键 词：航空超导磁探测 超导量子干涉器件 气压稳定装置 液氦温度 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TH762[自动化与计算机技术—控制科学与工程]