CAJ | 학술논문

超导量子干涉仪（ SQUID）作为目前灵敏度最高的磁场检测传感器，广泛应用于各类弱磁检测环境中。其中接收线圈直接影响低温扫描SQUID显微镜的空间分辨率和磁场灵敏度。通过讨论超导环路磁通量子化条件，得到低温SQUID接收线圈设计要求。同时为降低环境噪声提高系统灵敏度，设计制作了一阶梯度超导接收线圈并用其替换原有的螺线管接收线圈。该接收线圈利用直径为66μm低温铌钛超导线和蓝宝石线圈架在40倍体视显微镜下手工绕制，线圈半径为316μm，基线长度为1436μm，电感为0.873μH。实验结果表明：超导梯度接收线圈将系统的磁场灵敏度从250 pT/Hz提升至2 pT/Hz。最后利用该梯度接收线圈对玄武岩标本进行了初步测量，得到了有效的实测数据。
초도양자간섭의（ SQUID）작위목전령민도최고적자장검측전감기，엄범응용우각류약자검측배경중。기중접수선권직접영향저온소묘SQUID현미경적공간분변솔화자장령민도。통과토론초도배로자통양자화조건，득도저온SQUID접수선권설계요구。동시위강저배경조성제고계통령민도，설계제작료일계제도초도접수선권병용기체환원유적라선관접수선권。해접수선권이용직경위66μm저온니태초도선화람보석선권가재40배체시현미경하수공요제，선권반경위316μm，기선장도위1436μm，전감위0.873μH。실험결과표명：초도제도접수선권장계통적자장령민도종250 pT/Hz제승지2 pT/Hz。최후이용해제도접수선권대현무암표본진행료초보측량，득도료유효적실측수거。
As the most sensitive sensor for magnetic field detection,superconductivity quantum interference device ( SQUID)is widely used in many kinds of weak magnetic detection. The pickup coil directly influences spatial resolution and the magnetic field sensitivity of low-temperature scanning SQUID microscope. With discussion of superconducting loop flux quantization condition,design demand of low-temperature SQUID pickup coil is obtained. At the same time,design and fabricate first order gradient superconductivity pickup coil instead of original solenoid coil to decrease environmental noise and increase system sensitivity. This coil made by 66μm diameter low-temperature superconducting niobium wire enwound on the sapphire bobbin with 40 times microscope. The coil radius is 316μm,the baseline length is 1 436μm,and the inductance value is 0. 873μH. Experimental result show that magnetic field sensitivity of system is risen from 250 pT/Hz to 2 pT/Hz by superconductivity gradient pickup coil. Finally,basalt slice specimen is measured by this gradient pickup coil and valid datas are obtained .