Closed-Loop Diamond Quantum Sensor for Large Range and High Precision Current Measurement
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2024-01-05 |
| Journal | IEEE Sensors Journal |
| Authors | Qihui Liu, Fei Xie, Peng Xiao, Yonggui Zhang, Nan Wang |
| Institutions | State Key Laboratory of Transducer Technology, China Southern Power Grid (China) |
| Citations | 12 |
Abstract
Section titled “Abstract”Magnetic field sensors based on quantum effects have shown superior performance in sensitivity, wherein the nitrogen-vacancy (NV) center in diamond has emerged as a microfabrication compatible solid-state platform for measuring magnetic fields at room temperature. Here, a closed-loop current sensor based on a compact diamond sensor is presented. Adapting dual-frequency driving mode and magnetic balance approach, a magnetic-temperature dual-loop architecture is established to extend the dynamic range and suppress the temperature drift, simultaneously. The proposed current sensor demonstrates an accuracy of 0.061% at a measuring range of ±1000 A. An isolation factor of 30.3 dB for temperature against magnetic field is obtained via the dual-loop calibration. The closed-loop strategy permits rapid adjustment of the output signal to align with fluctuations in the primary current and the response speed is achieved up to 107.6 kA <inline-formula xmlns:mml=“http://www.w3.org/1998/Math/MathML” xmlns:xlink=“http://www.w3.org/1999/xlink”> <tex-math notation=“LaTeX”>$\cdot \text{s}^{-{1}}$ </tex-math></inline-formula> . Our proposed closed-loop current sensor has potential applications in power grid and electric vehicle monitoring systems.