用于胎儿心磁图的光学磁强计阵列
Optical Magnetometer Array for Fetal Magnetocardiography
摘要：
我们描述了一个阵列的自旋交换弛豫自由光学磁强计设计用于检测胎儿心磁图（fMCG）信号。单独的磁力计被配置为具有强光泵浦的小体积，被大的无泵浦区域包围。扩散出光泵浦区的自旋极化原子在环境磁场中进动，并被探测激光探测到。四个这样的磁力计，在一个7厘米的正方形的角落处，被配置用于梯度测量，通过将一个磁力计的输出反馈到场线圈，以使频率高达200 Hz的均匀磁场噪声为零。使用这个阵列，我们提出了使用原子磁力计的fMCG信号的第一次测量。
英文摘要：
We describe an array of spin-exchange relaxation free optical magnetometers designed for detection of fetal magnetocardiography (fMCG) signals. 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. Using this array, we present the first measurements of fMCG signals using an atomic magnetometer.
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