论文标题
使用涡流测量值远程检测到导电物体的非屏蔽式泵仪
Unshielded portable optically pumped magnetometer for the remote detection of conductive objects using eddy current measurements
论文作者
论文摘要
可以使用电磁诱导的原理检测到导电物体，其中主振荡磁场会在物体中诱导涡流，从而产生可以用磁力计测量的二级磁场。我们已经开发了一种便携式射频光学泵送磁力计（RF OPM），该条件是在未屏蔽条件下使用的，当时用于检测小型振荡磁场时，在未照射的条件下为小型振动磁场设定了新的基准测试，在未照射的条件下为便携式RF OPM的灵敏度设定了新的基准。使用此OPM，我们已经检测到直径小至1.5 cm的铝磁盘的诱导磁场，并且磁盘距激发线圈和磁力计约25厘米。当用于涡流检测时，我们的磁力计实现了2-6 pt/sqrt（Hz）的灵敏度。我们还使用RF OPM检测到一个移动的铝盘，并分析了取决于磁盘位置的磁力计信号，这说明了高灵敏度RF OPMS对于遥感应用的潜力。
Electrically conductive objects can be detected using the principle of electromagnetic induction where a primary oscillating magnetic field induces eddy currents in the object, which in turn produce a secondary magnetic field that can be measured with a magnetometer. We have developed a portable radio-frequency optically pumped magnetometer (RF OPM) working in unshielded conditions with sub-pT/sqrt(Hz) magnetic field sensitivity when used for the detection of small oscillating magnetic fields, setting a new benchmark for the sensitivity of a portable RF OPM in unshielded conditions. Using this OPM, we have detected the induced magnetic field from aluminium disks with diameters as small as 1.5 cm and with the disks being ~25 cm from both the excitation coil and the magnetometer. When used for eddy current detection, our magnetometer achieves a sensitivity of a 2-6 pT/sqrt(Hz). We have also detected a moving aluminium disk using our RF OPM and analysed the magnetometer signals which depend on the position of the disk, illustrating the potential of high sensitivity RF OPMs for remote sensing applications.
