超导梯度计及其对环境噪声的抑制能力  

Environmental noise cancellation of superconducting gradiometers

作　　者：陈亮[1] 蒋式勤[1] 谢晓明[2] 

机构地区：[1]同济大学电子与信息工程学院,上海200092 [2]信息功能材料国家重点实验室中国科学院上海微系统与信息技术研究所,上海200050

出　　处：《功能材料与器件学报》2008年第6期971-976,共6页Journal of Functional Materials and Devices

基　　金：国家自然科学基金项目(编号:60771030);上海科技发展基金项目(编号:054407061)

摘　　要：研究了超导磁传感器的交流标定方法,并在此基础上研究了不同软件梯度计的实现方案及其对环境干扰磁场的抑制能力。采用多个频率、多个强度的参考磁场对传感器进行标定得到的结果一致性良好。合成的一阶软件梯度计经过实验验证具有很好的微弱磁信号检测能力,在城市实验室噪声环境下成功实现了约50pT微弱磁场信号的探测。还对标定精度以及实验中观察到的不同软件梯度计方案结果之间的差别进行了讨论。The calibration methods of superconducting transducers with alternative magnetic fields were established. Different ways of construction software gradiometers and their performances for environmental noise cancellation were studied. Sensor calibrating with different frequencies and amplitudes showed good consistency. The constructed synthetic first order gradiometers demonstrated good ability for environmental noise rejection, enabling detecting of weak magnetic field of 50pT in normal urban laboratory environment. The uncertainty of the calibration and the observed minor differences between different gradiometers were also discussed.

关 键 词：SQUID 磁强计 硬件梯度计 软件梯度计 环境噪声抑制 

分 类 号：O514.2[理学—低温物理]