基于无微波金刚石NV色心测磁技术的电流测量应用

Application of Magnetometry Technique Based on Microwave-Free Diamond NV Color Center in Current Measurement

为了在特高压(UHV)环境下使用氮-空位(NV)色心量子测量技术,研究了金刚石主轴与磁场夹角对相应曲线及电流测量精度的影响。构建金刚石氮-空位七能级超精细结构模型,根据仿真结果得到不同磁场方向下最高灵敏度范围和最佳测量范围,从而确定探头的最佳放置角度。基于无微波金刚石氮-空位技术搭建了直流大电流测量实验平台,测试了100~5000A范围内荧光电压对电流的响应曲线。实验结果表明,该平台对5000A直流电流测量误差在0.25%以内。作为无源器件,无微波金刚石氮-空位色心测磁传感器全光纤信号传输具备良好耐压性能,同时可在室温下工作,并具有结构紧凑、灵敏度高、抗电磁干扰能力强等优势,适用于特高压环境下的直流电流测量,为传统电力行业检测提供了新的检测方法。

To use nitrogen-vacancy(NV)color center quantum measurement technology in ultrahigh voltage(UHV)environment,the influences of the angle between diamond spindle and magnetic field on the corresponding curve and current measurement accuracy were studied.The ultrafine structure model of seven energy levels of diamond nitrogen-vacancy was constructed,and the highest sensitivity range and the best measurement range were obtained according to the simulation results,so as to determine the optimal placement angle of the probe.Based on the microwave-free diamond nitrogen-vacancy technology,a DC high current measurement platform was established to test the response curve of fluorescence voltage to current in the range of 100~5000 A.The experimental results show that the measurement error of the platform for 5000 A DC current is less than 0.25%.As a passive device,the microwave-free diamond nitrogenvacancy color center magnetometric sensor has good voltage resistance in all-optical fiber signal transmission,can work at room temperature,and has the advantages of compact structure,high sensitivity,strong anti-electromagnetic interference ability,etc.,which is suitable for DC current measurement in UHV environment,providing a new detection method for the detection of traditional power industry.