Multichannel Control for Optimizing the Speed of Imaging in Quantum Diamond Microscope

As a highly sensitive quantum magnetometer, the diamond nitrogen-vacancy (NV) center is capable of operating in extreme environments such as high temperature and pressure. When coupled with a wide-area imaging sensor, it enables wide-field imaging with spatial resolution close to the optical limit, providing an innovative approach to wide-field magnetic imaging in various fields, including medical visualization, basic scientific research, and electronic circuit anomaly diagnosis. Conventionally, optical detection magnetic resonance (ODMR) enables the measurement of magnetic field for the diamond NV centers. However, obtaining the ODMR requires continuous sweeping of a long microwave bandwidth, inducing long blind area errors that limit imaging speed and reduce practical application. To mitigate ODMR sweep time, we introduce a diamond NV center microscope based on a multichannel control system (MCCS). The MCCS realizes intermittent frequency sweeping, enabling it to eliminate the ODMR transition Section and collect only segments containing spin information. This novel approach reduces acquisition time and speeds up computer solution speed. To validate the effectiveness of our proposed system, we perform magnetic field imaging of the printed circuit board (PCB). At the same testing conditions, the MCCS-based system enables six times acquisition speed compared to continuous-wave ODMR (CW-ODMR) and confidence to 95%.