Imaging of material defects with a radio-frequency atomic magnetometer.
Imaging of material defects with a radio-frequency atomic magnetometer.
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DOI：
10.1063/1.5053959
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发表时间：
2018-10
期刊：
影响因子：
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通讯作者：
P. Bevington;R. Gartman;W. Chalupczak
中科院分区：
文献类型：
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作者：
P. Bevington;R. Gartman;W. Chalupczak
利用射频原子磁力仪的磁共振信号对金属板中的缺陷进行无损感应检测。的信号特征，这代表结构缺陷的空间分布的形状和幅度进行了探讨。通过比较一系列基准铝板上的数值计算和实验结果，我们显示了二次场的特性与磁强计信号的特性之间的对应关系。特别是，我们表明，二次场的两个组成部分被映射到原子磁力计信号的振幅和相位。因此，用原子磁力计进行的磁场测量，虽然本质上是标量的，但提供了关于次级场的半矢量信息。此外，我们展示了一个强大的过程，用于确定缺陷尺寸，这是不受限制的传感器的大小。我们证明，所观察到的配置文件的振幅和相位对比，使我们能够可靠地测量缺陷深度。
Non-destructive inductive testing of defects in metal plates using the magnetic resonance signal of a radio-frequency atomic magnetometer is demonstrated. The shape and amplitude of the spatial profile of the signal features, which represent structural defects, are explored. By comparing numerical and experimental results on a series of benchmark aluminium plates, we show correspondence between the properties of the secondary field and those of the magnetometer signal. In particular, we show that two components of the secondary field are mapped onto the amplitude and phase of the atomic magnetometer signal. Hence, a magnetic field measurement with the atomic magnetometer, although scalar in its nature, provides semi-vectorial information on the secondary field. Moreover, we demonstrate a robust process for determining defect dimensions, which is not limited by the size of the sensor. We prove that the amplitude and phase contrast of the observed profiles enables us to reliably measure defect depth.