Magnetocardiography with a modular spin-exchange relaxation-free atomic magnetometer array.

We present a portable four-channel atomic magnetometer array operating in the spin exchange relaxation-free regime. The magnetometer array has several design features intended to maximize its suitability for biomagnetic measurement, specifically foetal magnetocardiography, such as a compact modular design and fibre coupled lasers. The modular design allows the independent positioning and orientation of each magnetometer. Using this array in a magnetically shielded room, we acquire adult magnetocadiograms. These measurements were taken with a 6–11 fT Hz−1/2 single-channel baseline sensitivity that is consistent with the independently measured noise level of the magnetically shielded room.

我们展示了一种在无自旋交换弛豫机制下运行的便携式四通道原子磁力仪阵列。该磁力仪阵列具有若干设计特点，旨在最大程度地提高其对生物磁测量（特别是胎儿心磁图测量）的适用性，例如紧凑的模块化设计和光纤耦合激光器。模块化设计允许每个磁力仪独立定位和定向。在磁屏蔽室内使用该阵列，我们获取了成人的心磁图。这些测量是在单通道基线灵敏度为6 - 11 fT Hz⁻¹/²的情况下进行的，这与磁屏蔽室独立测量的噪声水平相符。