极化3He系统核磁共振FID信号的激光探测
收稿日期: 2022-03-21
网络出版日期: 2022-12-01
基金资助
国家自然科学基金资助项目(U2030209);国家重点研发计划项目(2020YFA0406001)
Laser Detection of Nuclear Magnetic Resonance FID Signal for Polarized 3He System
Received date: 2022-03-21
Online published: 2022-12-01
极化率测量装置是极化3He系统的重要组成部分之一.本文介绍了一套在极化3He系统上搭建的激光探测自由感应衰减核磁共振（FID NMR）信号的实验装置，该装置有望为3He极化率的高精度实时测量提供新的途径.激光探测法的原理是法拉第旋光效应，该方法使用一束线偏振光探测极化3He磁矩绕主磁场进动的FID信号，实验结果表明相较于拾波线圈探测方法，激光探测方法的信噪比提高了106%，对3He的极化率测量更精确.该探测方法有望替代传统的拾波线圈，广泛地应用于3He极化系统的极化率测量或精密测量实验中.
关键词： 极化3He; 自由感应衰减核磁共振(FID NMR); 激光探测; 法拉第旋光效应
王昶沣 , 兰阳 , 闫海洋 , 彭梅 , 陈思宇 . 极化3He系统核磁共振FID信号的激光探测[J]. 波谱学杂志, 2022 , 39(4) : 459 -466 . DOI: 10.11938/cjmr20222987
Polarimetry is an important part of a polarized 3He system. This work describes a laser detection setup which measures the free induction decay nuclear magnetic resonance (FID NMR) signal in the spin-polarized 3He system. The setup provides a novel approach to the high precision real-time polarization measurement of the polarized 3He systems. This laser detection method is based on Faraday rotation effect, which utilizes a linearly polarized laser beam to detect the FID signal of the magnetic moment of 3He atoms which precess along the direction of the main magnetic field. Compared with traditional pick-up coils, experimental results demonstrate that the laser detection method has a signal-to-noise ratio improvement of 106% and consequently higher precision in 3He polarization measurement. The laser detection method proposed in this paper can replace the pickup coils, and it has various applications in the polarization measurement of 3He systems or in precision measurement experiments.
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