A Magnetic Field In-Situ Measurement Method of the Heating Film in Atomic Sensors

For the magnetically sensitive atomic sensors, heating the vapor cell without introducing magnetic field is required. In order to evaluate the heating film magnetic field suppression effect, independent magnetometer is usually employed. However, in this method the accuracy of magnetic field measurement result is greatly affected by the distance between the magnetometer and the tested heating film, as magnetic field is inversely proportional to the distance. In order to overcome this issue, an in-situ magnetic field measurement method is proposed. The measurement principle is based on the Larmor precession of the spin polarized noble gases. The magnetic field of the heating film assembled into the atomic sensor can be measured by the atomic sensor itself. The measurement results directly reflect the influence of the heating film on the atomic sensor. So, the distance error existed in the independent magnetometer-based method can be avoided in principle. Owing to the in-situ measurement method, the measurement results can be used to evaluate the magnetic field suppression effect more accurately. Finally, it can be used for further improve the heating film performance.