A Coil Constant Calibration Method Based on the Phase-Frequency Response of Alkali Atomic Magnetometer

• 来源期刊: 光子传感器（英文版）
• 关键词: Optical atomic magnetometer coil constant calibration phase-frequency analysis Larmor precession
• 年，卷（期）: 2019,（2）
• 页码范围: 189-196
• 页数: 8页
• 语种: 英文
• DOI: 10.1007/s13320-019-0530-4

摘要

We propose an in-situ method to calibrate the coil constants of the optical atomic magnetometer.This method is based on measuring the Larmor precession of spin polarized alkali metal atoms and has been demonstrated on a K-Rb hybrid atomic magnetometer.Oscillation fields of different frequencies are swept on the transverse coil.By extracting the resonance frequency through phase-frequency analysis of electron spin projection,the coil constants are calibrated to be 323.1±0.28nT/mA,108±0.04nT/Ma,and 185.8± 1.03nT/mA along the X,Y,and Z directions,respectively.