Abstract：In order to realize high-precision micro-displacement detection, the nitrogen-vacancy (NV) color center magnetometer is taken as the basis, and testing is conducted using the quantum spin regulation principle and uniform variation of spatial gradient magnetic field. Firstly, the permanent magnet constructed the gradient magnetic field with uniform variation, and the correlation between the gradient magnetic field and displacement is obtained. Secondly, The Ramsay sequence parameters required by the experiment were determined by testing the NV color center optical probe magnetic resonance (ODMR) frequency points and determining the quantum flip period corresponding to the Rabi oscillation in the time domain. Finally, the correlation test of fluorescence amplitude and magnetic field gradient change corresponding to Ramsay was completed based on the Ramsey magnetic field measurement principle. The corresponding relationship between fluorescence intensity and displacement change was obtained, to realize the micro displacement measurement. The minimum resolution of displacement is about 104 nm.
2024, Vol. 45 
