AI 中文总结
本研究将相关技术整合到Bell-Bloom光抽运的FID磁力计中，通过多通腔气室加反射镜消除死区，实现三维全空间优于80 fT/Hz^(1/2)的灵敏度，为矢量FID磁力计奠定基础。
AI 中文摘要
探测死区是标量原子磁力计中重要的系统限制，制约了其实际应用。本研究将已建立的技术整合到基于Bell-Bloom光抽运的自由感应衰减（FID）磁力计中，展示了一种灵敏的无死区标量磁力计。通过在多通腔辅助的原子气室中插入反射镜，将光束折叠成正交路径，消除了死区。分析表明，区域间串扰对解释所得实验信号至关重要。该传感器在三维空间所有取向上的振荡信号幅度变化在3倍以内，全空间的磁场灵敏度优于80 fT/Hz^(1/2)。我们进一步表征了地磁范围内的航向误差，实验结果与理论预测的偏差在0.7 nT以内。此外，该传感器可通过从FID信号中提取实时频率反馈以调制抽运光束，实现闭环模式运行，我们对其磁场 slew rate（ slew rate： slew率）进行了表征。本研究为开发灵敏的矢量FID磁力计铺平了道路。
英文摘要
The detection dead zone is an important systematic limitation in scalar atomic magnetometers, constraining their practical utility. In this work, we demonstrate a sensitive dead zone free scalar magnetometer by integrating previously established techniques into a FID magnetometer based on Bell Bloom optical pumping. The dead zone is eliminated by inserting a reflecting mirror within a multipass cavity assisted atomic cell, which folds the optical beam into orthogonal paths. Our analysis reveals that interregion cross talk is essential for interpreting the resulted experimental signals. The sensor exhibits oscillation signal amplitude variations within a factor of three across all orientations in three dimensional space, and a field sensitivity better than 80 fT/Hz^(1/2) over the full space. We further characterize the heading error in the geomagnetic field range, where experimental results agree with theoretical predictions within 0.7 nT. Additionally, the sensor can operate in a closed loop mode by feeding back the real time frequency extracted from the FID signal to modulate the pump beam, we characterize the magnetic field slew rate of the sensor. This work paves the way towards a sensitive vector FID magnetometer.
Comments11 pages,8 figures, accepted by PRA
