A Synchronous Spin-Exchange Optically Pumped NMR-Gyroscope
A Synchronous Spin-Exchange Optically Pumped NMR-Gyroscope
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DOI：
10.3390/app10207099
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发表时间：
2020-10-01
影响因子：
2.7
通讯作者：
Walker, Thad G.
中科院分区：
文献类型：
--
作者：
Sorensen, Susan S.;Thrasher, Daniel A.;Walker, Thad G.
惯性导航系统通常由定时、加速度和方位测量单元组成。虽然在开发原子钟等主要计时源方面已经取得了很大进展，但加速度和方向测量装置通常需要校准。核磁共振（NMR）陀螺仪依赖于对两种共位极化惰性气体的同时拉莫尔进动的连续测量，可以被配置为具有仅依赖于基本常数的一阶的比例因子。惰性气体通过与位于同一位置的光泵浦碱金属原子的自旋交换碰撞而极化。碱金属原子也被用来探测极化惰性气体核的进动相位。在这里，我们提出了一个版本的NMR陀螺仪，旨在抑制系统误差的碱金属原子。我们证明旋转速率角随机游走（ARW）的灵敏度为16 μ Hz/Hz和偏置不稳定性类似于800 nHz。
Inertial navigation systems generally consist of timing, acceleration, and orientation measurement units. Although much progress has been made towards developing primary timing sources such as atomic clocks, acceleration and orientation measurement units often require calibration. Nuclear Magnetic Resonance (NMR) gyroscopes, which rely on continuous measurement of the simultaneous Larmor precession of two co-located polarized noble gases, can be configured to have scale factors that depend to first order only on fundamental constants. The noble gases are polarized by spin-exchange collisions with co-located optically pumped alkali-metal atoms. The alkali-metal atoms are also used to detect the phase of precession of the polarized noble gas nuclei. Here we present a version of an NMR gyroscope designed to suppress systematic errors from the alkali-metal atoms. We demonstrate rotation rate angle random walk (ARW) sensitivity of 16 mu Hz/Hz and bias instability of similar to 800 nHz.