金属表面裂纹的氮-空位色心漏磁检测

Nitrogen-vacancy color center magnetic flux leakage detection of metal surface cracks

基于氮-空位(NV)色心对磁场的敏感特性,以含浓度1~2 ppm(百万分之一)NV色心的金刚石量子传感器为核心,微波共振扫频激发NV色心的量子自旋为基础,通过优化的共聚焦光路激发NV色心来收集反射回的含磁场信息的光信号,以3块板卡组成控制采集模块对信号进行滤波处理和可视化处理,搭建一套量子精密测量系统。采用该量子精密测量系统完成0.1~1 mm深度下和5~15 mm提离值下的金属表面裂纹检测。试验结果表明,该系统的磁场测量灵敏度达6 nT·Hz^(-1),可完成最小深度为0.1 mm和最大提离值为15 mm的金属表面裂纹检测,为金属表面裂纹的工业检测提供了一种新方式。

Based on the sensitive characteristics of nitrogen-vacancy(NV)color center to magnetic field,the diamond quantum sensor containing a concentration of 1-2 ppm NV color center was the core,and the quantum spin of the NV color center excited by microwave resonance frequency sweep was the foundation,and the NV color center was excited by the optimized confocal optical path to collect the reflected optical signal containing magnetic field information for signal collection,and the control acquisition module composed of three boards was used to filter and visualize the signal for signal processing,and a quantum precision measurement system was built.The quantum precision measurement system was used to detect metal cracks at a depth of 0.1 mm^(-1) mm and a lifting value of 5 mm-15 mm.The experimental results showed that the sensitivity of the system was 6 nT·Hz-1,the minimum depth of 0.1 mm and metal crack detection with a maximum lift value of 15 mm can be achieved,providing a new detection method for metal crack industrial detection.