Low complexity vector magnetic information detection method based on diamond NV color center

Abstract This paper introduces a low-complexity vector magnetic field solution based on a diamond NV ensemble. Firstly, the bias magnetic field of the diamond NV colour centre equifrequency difference optical detection magnetic resonance (ODMR) spectrum is adjusted, and the conversion matrix is derived by utilising the projection of the external magnetic field on the NV axis of the diamond, which exhibits an equal probability distribution, and the preset magnetic field to be measured. The vector magnetic field information solution model is then constructed. Subsequently, the pulse timing system is employed to regulate the antenna, enabling the generation of microwave pulse signals with uniform timing and frequency difference. Finally, the accuracy of the vector magnetic information solution is verified by the established model and the entire detection system. The final vector magnetic field detection exhibits the amplitude difference of coil calculation results is less than 3.6%, and the angle difference of coil calculation results is less than 1.8◦. In comparison to alternative methodologies, the amplitude and angle discrepancies in coil calculation outcomes are simultaneously minimized.