用金刚石磁力仪成像钢中的损伤
Imaging damage in steel using a diamond magnetometer
摘要：
我们展示了一种简单，稳健和非接触的方法，用于磁性材料（如钢）的无损检测。这使用了基于金刚石中的氮空位中心（NVC）的光纤耦合磁传感器，而没有磁屏蔽。先前的NVC磁力测量法寻求均匀的偏置磁场，但在我们的设计中，我们故意施加不均匀的磁场。由于我们的实验装置，我们实现了高的空间分辨率：1毫米的平面平行和0.1毫米的平面垂直于钢的表面。在钢结构损伤扭曲这种不均匀的磁场，并通过检测这种扭曲，我们重建的损伤轮廓，通过量化的变化，在NVC塞曼分裂。即使钢被非磁性材料覆盖，这也有效。我们的传感头离316不锈钢表面的提离距离可达3~ mm。
英文摘要：
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.
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