2025/02/17 by Ge Jin, Jin, Ge, Tao Shi +3
Engineering · Biochemistry, Genetics and Molecular Biology · #Magnetic Field Sensors Techniques #Geomagnetism and Paleomagnetism Studies #Inertial Sensor and Navigation
paper · pdf · doi:10.48550/arxiv.2502.11512
In this paper, we present a triaxial alignment magnetometer based on free-spin precession deployed in the geomagnetic range. Existing vector measurement methods often require complex optical setups, heating structures, and laser modulation. This study addresses this challenge by employing a linearly polarized probe beam to induce atomic alignment and subsequently detecting the optical polarization rotation caused by the pulsed radio frequency field. The experiment is conducted in a paraffin-coated cell without buffer gas at room temperature, containing rubidium with natural abundance. We report triaxial measurements with a static magnetic field amplitude of approximately 50 μT (close to Earth's magnetic field), where the noise levels for each axis are approximately 5.3 pT/√(Hz), 4.7 pT/√(Hz), and 9.3 pT/√(Hz) respectively. The proposed method demonstrates a simple structure suitable for cost-effective and versatile applications.