Data for: "Non-destructive structural imaging of steelwork with atomic magnetometers"

Fig2: rf spectra with and without active field stabilisation. Fig3: 2D amplitude and phase images measured across a steel plate with a recess of varying depth. Fig4: Files representing a cross-section of the data shown in Fig3. These are used to calculate the amplitude contrast shown in Fig4. Fig5: 2D amplitude and phase images measured across a steel plate covered with a 0.5 mm thick piece of Aluminium.

图2：采用与未采用主动场稳定（Active Field Stabilisation）的射频光谱（RF spectra）。
图3：针对带有不同深度凹槽的钢板测量得到的二维振幅与相位图像。
图4：代表图3所示数据横截面的文件，此类文件用于计算图4中展示的振幅衬度。
图5：针对覆盖有0.5毫米厚铝片的钢板测量得到的二维振幅与相位图像。