Optical magnetometer array for fetal magnetocardiography.
Optical magnetometer array for fetal magnetocardiography.
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DOI：
10.1364/ol.37.002247
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发表时间：
2012-06-15
期刊：
影响因子：
3.6
通讯作者：
Walker TG
中科院分区：
文献类型：
--
作者：
Wyllie R;Kauer M;Wakai RT;Walker TG
我们描述了一种用于检测胎儿心磁图(FMCG)的无自旋交换弛豫光学磁强计阵列。单个磁力计配置有一个小体积，具有强烈的光泵浦，周围环绕着一个大的无泵浦区域。扩散出光泵浦区的自旋极化原子在周围磁场中运动，并被探测激光探测到。四个这样的磁力计位于7厘米正方形的角落，通过将一个磁力计的输出反馈到磁场线圈以消除频率高达200赫兹的均匀磁场噪声来配置用于梯度测量。我们介绍了使用原子磁强计对FMCG信号的第一次测量。
We describe an array of spin-exchange-relaxation-free optical magnetometers designed for detection of fetal magnetocardiography (fMCG). The individual magnetometers are configured with a small volume with intense optical pumping, surrounded by a large pump-free region. Spin-polarized atoms that diffuse out of the optical pumping region precess in the ambient magnetic field and are detected by a probe laser. Four such magnetometers, at the corners of a 7 cm square, are configured for gradiometry by feeding back the output of one magnetometer to a field coil to null uniform magnetic field noise at frequencies up to 200 Hz. We present the first measurements of fMCG signals using an atomic magnetometer.