论文标题
使用钻石磁力计在钢中成像损坏
Imaging damage in steel using a diamond magnetometer
论文作者
论文摘要
我们展示了一种简单，健壮和无接触式的方法，用于对钢铁材料（例如钢）进行非破坏性测试。这使用了基于钻石中的氮空位中心（NVC）的纤维耦合磁传感器，而无需磁性屏蔽。先前的NVC磁力测定法已寻求均匀的偏置磁场，但是在我们的设计中，我们故意应用了不均匀的磁场。由于我们的实验设置，我们达到了高空间分辨率：平行于平面平行的1毫米，在垂直于钢表面的平面中平行于0.1〜mm。钢中的结构损伤会扭曲这个不均匀的磁场，并通过检测到这种失真，我们通过量化NVC Zeeman拆分的变化来重建损坏曲线。即使钢被非磁性材料覆盖，这也起作用。我们的传感器头与316不锈钢表面的提升距离高达3毫米。
We demonstrate a simple, robust and contactless method for non-destructive testing of magnetic materials such as steel. This uses a fiber-coupled magnetic sensor based on nitrogen vacancy centers (NVC) in diamond without magnetic shielding. Previous NVC magnetometry has sought a homogeneous bias magnetic field, but in our design we deliberately applied an inhomogeneous magnetic field. As a consequence of our experimental set-up we achieve a high spatial resolution: 1~mm in the plane parallel and 0.1~mm in the plane perpendicular to the surface of the steel. Structural damage in the steel distorts this inhomogeneous magnetic field and by detecting this distortion we reconstruct the damage profile through quantifying the shifts in the NVC Zeeman splitting. This works even when the steel is covered by a non-magnetic material. The lift-off distance of our sensor head from the surface of 316 stainless steel is up to 3~mm.
