High Tc superconducting asymmetric gradiometer for biomagnetic applications
High Tc superconducting asymmetric gradiometer for biomagnetic applications
复制标题
用于生物磁应用的高温超导非对称梯度计
DOI：
10.1063/1.1150706
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发表时间：
2000
影响因子：
1.6
通讯作者：
J. Clarke
中科院分区：
文献类型：
--
作者：
K. Kouznetsov;J. Borgmann;J. Clarke
我们描述了一种用于非屏蔽环境中生物磁测量的一阶高温超导梯度计。梯度仪包括一个单层平面磁通变压器，它有两个大小不等的环路，其中较小的一个电感耦合到直接耦合磁强计的拾取环路。在这种配置中，磁通变压器的存在仅使磁力计的灵敏度降低约5%。磁通变压器是在直径为100 mm的晶片上沉积的YBa2Cu3O7−δ薄膜上形成图案的，基线为48 mm。磁通变压器和磁力计基板以倒装芯片的方式永久粘合在一起。对于任意方向的均匀磁场起伏，共模抑制效果优于1/100。将两个这样的梯度计的输出相减，形成二阶梯度计，它将一阶梯度波动抑制到大约1/100。借助三个垂直安装的..。
We describe a high transition temperature superconducting, first-order gradiometer intended for biomagnetic measurements in an unshielded environment. The gradiometer involves a single-layer, planar flux transformer with two loops of unequal size, the smaller of which is inductively coupled to the pickup loop of a directly coupled magnetometer. In this configuration, the presence of the flux transformer reduces the sensitivity of the magnetometer by only about 5%. The flux transformer is patterned in a thin film of YBa2Cu3O7−δ deposited on a 100 mm diam wafer, and has a baseline of 48 mm. The flux transformer and magnetometer substrates are permanently bonded together in a flipchip arrangement. The common mode rejection of uniform magnetic field fluctuations in any direction is better than 1 part per 100. The outputs of two such gradiometers are subtracted to form a second-order gradiometer, which rejects first-order gradient fluctuations to about 1 part in 100. With the aid of three orthogonally mounted ...