Magnetic field imaging with microfabricated optically-pumped magnetometers
Magnetic field imaging with microfabricated optically-pumped magnetometers
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DOI：
10.1364/oe.25.007849
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发表时间：
2017-04-03
期刊：
影响因子：
3.8
通讯作者：
Knappe, Svenja
中科院分区：
文献类型：
--
作者：
Alem, Orang;Mhaskar, Rahul;Knappe, Svenja
介绍了一种由25个微细加工的光泵磁强计组成的多通道成像系统。传感器探头的面积小于1 cm(2)，敏感体积为1.5 mm x 1.5 mm x 1.5 mm，并通过长度为5 m的光纤连接到控制单元。在非常低的环境磁场下工作，传感器阵列的平均磁灵敏度为24 FT/Hz(1/2)，当每个传感器的噪声平均在10至50 Hz之间时，标准偏差为5 FT/Hz(1/2)。在地球磁场中工作，磁力计的场灵敏度约为5pT/hz(1/2)。真空封装的传感器头是光学加热的，每个平均消耗76+/-7兆瓦的功率。加热功率由八个二极管激光器组成的阵列提供。利用该传感器阵列获得了微小探头线圈的磁场成像，与预期的场型吻合较好，与测量数据吻合较好。(C)2017年美国光学学会
A multichannel imaging system is presented, consisting of 25 microfabricated optically-pumped magnetometers. The sensor probes have a footprint of less than 1 cm(2) and a sensitive volume of 1.5 mm x 1.5 mm x 1.5 mm and connect to a control unit through optical fibers of length 5 m. Operating at very low ambient magnetic fields, the sensor array has an average magnetic sensitivity of 24 fT/Hz(1/2), with a standard deviation of 5 fT/Hz(1/2) when the noise of each sensor is averaged between 10 and 50 Hz. Operating in Earth's magnetic field, the magnetometers have a field sensitivity around 5 pT/Hz(1/2). The vacuum-packaged sensor heads are optically heated and consume on average 76 +/- 7 mW of power each. The heating power is provided by an array of eight diode lasers. Magnetic field imaging of small probe coils was obtained with the sensor array and fits to the expected field pattern agree well with the measured data. (C) 2017 Optical Society of America