Iivanainen Joonas, Carter Tony R, Dhombridge Jonathan E, Read Timothy S, Campbell Kaleb, Abate Quinn, Ridley David M, Borna Amir, Schwindt Peter D D
Opt Express. 2024 May 6;32(10):18334-18351. doi: 10.1364/OE.517961.
We present a novel four-channel optically pumped magnetometer (OPM) for magnetoencephalography that utilizes a two-color pump/probe scheme on a single optical axis. We characterize its performance across 18 built sensor modules. The new sensor implements several improvements over our previously developed sensor including lower vapor-cell operating temperature, improved probe-light detection optics, and reduced optical power requirements. The sensor also has new electromagnetic field coils on the sensor head which are designed using stream-function-based current optimization. We detail the coil design methodology and present experimental characterization of the coil performance. The magnetic sensitivity of the sensor is on average 12.3 fT/rt-Hz across the 18 modules while the average gradiometrically inferred sensitivity is about 6.0 fT/rt-Hz. The sensor 3-dB bandwidth is 100 Hz on average. The on-sensor coil performance is in good agreement with the simulations.
我们展示了一种用于脑磁图的新型四通道光泵磁力仪（OPM），它在单个光轴上采用双色泵浦/探测方案。我们对18个已构建的传感器模块的性能进行了表征。与我们之前开发的传感器相比，新传感器有多项改进，包括更低的蒸汽室工作温度、改进的探测光检测光学器件以及降低的光功率要求。该传感器在传感器头上还配备了新的电磁场线圈，这些线圈是使用基于流函数的电流优化设计的。我们详细介绍了线圈设计方法，并展示了线圈性能的实验表征。在这18个模块中，传感器的磁灵敏度平均为12.3 fT/√Hz，而平均梯度推断灵敏度约为6.0 fT/√Hz。传感器的3分贝带宽平均为100 Hz。传感器上的线圈性能与模拟结果吻合良好。
