Precise measurement of magnetic field gradients from free spin precession signals of 3He and 129Xe magnetometers
Precise measurement of magnetic field gradients from free spin precession signals of 3He and 129Xe magnetometers
复制标题
DOI：
10.1140/epjd/e2017-70505-4
复制
发表时间：
2016-08
期刊：
影响因子：
--
通讯作者：
F. Allmendinger;P. Blümler;M. Doll;Olivier Grasdijk;W. Heil;K. Jungmann;S. Karpuk;H. Krause;A. Offenhäusser;M. Repetto;U. Schmidt;Y. Sobolev;K. Tullney;L. Willmann;S. Zimmer
中科院分区：
文献类型：
--
作者：
F. Allmendinger;P. Blümler;M. Doll;Olivier Grasdijk;W. Heil;K. Jungmann;S. Karpuk;H. Krause;A. Offenhäusser;M. Repetto;U. Schmidt;Y. Sobolev;K. Tullney;L. Willmann;S. Zimmer
本文报道了从旋进自旋样品的横向弛豫率中提取的磁场梯度的精确测量。实验方法是基于气体，核自旋极化的3 He和129氦原子在一个球形细胞内的磁引导场约400 nT使用LTCSQUID作为低噪声磁通探测器的自由进动。两个自旋物种的横向弛豫率同时监测磁场梯度的变化。对于达到100 h的横向弛豫时间，可以推导出穿过自旋样品的剩余纵向场梯度为：|Bz| =（5.6 ± 0.2）pT/cm。该方法利用了高信噪比的优势，可以监测衰减的自旋进动信号，最终导致在亚pT/cm尺度下确定磁场梯度的异常精度。图形摘要
AbstractWe report on precise measurements of magnetic field gradients extracted from transverse relaxation rates of precessing spin samples. The experimental approach is based on the free precession of gaseous, nuclear spin polarized3He and129Xe atoms in a spherical cell inside a magnetic guiding field of about 400 nT using LTCSQUIDs as low-noise magnetic flux detectors. The transverse relaxation rates of both spin species are simultaneously monitored as magnetic field gradients are varied. For transverse relaxation times reaching 100 h, the residual longitudinal field gradient across the spin sample could be deduced to be |∇Bz| = (5.6 ± 0.2) pT/cm. The method takes advantage of the high signal-to-noise ratio with which the decaying spin precession signal can be monitored that finally leads to the exceptional accuracy to determine magnetic field gradients at the sub pT/cm scale.Graphical abstract