To address the demands in healthcare and industrial settings for spatially resolved magnetic imaging, we present a modular optically pumped magnetometer (OPM) system comprising a multi-sensor array of highly sensitive quantum magnetometers. This system is designed and built to facilitate fast prototyping and testing of new measurement schemes by enabling quick reconfiguration of the self-contained laser and sensor modules as well as allowing for the construction of various array layouts with a shared light source. The modularity of this system facilitates the development of methods for managing high-density arrays for magnetic imaging. The magnetometer sensitivity and bandwidth are first characterised in both individual channel and differential gradiometer configurations before testing in a real-world magnetoencephalography environment by measuring alpha rhythms from the brain of a human participant. We demonstrate the OPM system in a first-order axial gradiometer configuration with a magnetic field gradient sensitivity of 10fT/cm/Hz at a baseline of 4.5 cm. Single-channel operation achieved a sensitivity of 65fT/Hz . Bandwidths exceeding 200Hz were achieved for two independent modules. The system’s increased temporal resolution allows for the measurement of spinal cord signals, which we demonstrate by using phantom signal trials and comparing with an existing commercial sensor.

中文翻译：

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模块化光泵磁力计系统


为了满足医疗保健和工业环境中对空间分辨磁成像的需求，我们提出了一种模块化光泵磁力计 (OPM) 系统，其中包含高灵敏度量子磁力计的多传感器阵列。该系统的设计和构建是为了通过实现独立激光器和传感器模块的快速重新配置以及允许使用共享光源构建各种阵列布局来促进新测量方案的快速原型设计和测试。该系统的模块化有助于开发管理磁成像高密度阵列的方法。首先在单独通道和差分梯度计配置中表征磁力计的灵敏度和带宽，然后通过测量人类参与者大脑的阿尔法节律在现实世界的脑磁图环境中进行测试。我们展示了采用一阶轴向梯度计配置的 OPM 系统，在 4.5 cm 基线处磁场梯度灵敏度为 10fT/cm/Hz。单通道操作实现了 65fT/Hz 的灵敏度。两个独立模块的带宽超过 200Hz。该系统提高的时间分辨率可以测量脊髓信号，我们通过使用幻象信号试验并与现有的商业传感器进行比较来证明这一点。