Magnetic field measurement method based on atomic spin magnetic resonance

The invention provides a magnetic field measurement method based on atomic spin magnetic resonance. The magnetic field measurement method comprises the following steps: carrying out equal-power light splitting on a polarized light beam and then respectively polarizing the polarized light beam into left-hand circularly polarized light and right-hand circularly polarized light; adjusting the wavelength of the polarized light beam to be at an atomic transition frequency, enabling the left-hand circularly polarized light to enter a first photoelectric detector after penetrating through the atomic gas chamber, enabling the right-hand circularly polarized light to enter a second photoelectric detector after penetrating through the atomic gas chamber, applying an excitation magnetic field to the atomic gas chamber, and scanning the excitation magnetic field frequency in a set frequency interval of magnetic resonance frequency, constructing a differential magnetic resonance curve by taking the differential optical po