Hatsell C P
Harry G. Armstrong Aerospace Medical Research Laboratory, Wright-Patternson Air Force Base, OH.
IEEE Trans Biomed Eng. 1991 Jun;38(6):597-601. doi: 10.1109/10.81585.
Gradiometers use spatial common mode magnetic field rejection to reduce interference from distant sources. They also introduce distortion that can be severe, rendering experimental data difficult to interpret. Attempts to recover the measured magnetic field from the gradiometer output will be plagued by the nonexistence of a spatial function for deconvolution (except for first-order gradiometers), and by the high-pass nature of the spatial transform that emphasizes high spatial frequency noise. Goals of a design for a facility for measuring biomagnetic fields should be an effective shielded room and a field detector employing a first-order gradiometer.
梯度仪利用空间共模磁场抑制来减少来自远处源的干扰。它们还会引入可能很严重的失真，使实验数据难以解释。从梯度仪输出中恢复测量磁场的尝试将受到反卷积空间函数不存在（一阶梯度仪除外）以及强调高空间频率噪声的空间变换的高通特性的困扰。用于测量生物磁场的设施的设计目标应该是一个有效的屏蔽室和一个采用一阶梯度仪的场探测器。
