极化3He系统核磁共振FID信号的激光探测

doi:10.11938/cjmr20222987

波谱学杂志 ›› 2022, Vol. 39 ›› Issue (4): 459-466.doi: 10.11938/cjmr20222987

极化³He系统核磁共振FID信号的激光探测

王昶沣,兰阳,闫海洋,彭梅,陈思宇*()

中子物理重点实验室, 核物理与化学研究所, 中国工程物理研究院, 四川绵阳 621900

收稿日期:2022-03-21 出版日期:2022-12-05 发布日期:2022-12-01
通讯作者: 陈思宇 E-mail:chensy_nemail@163.com
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

Chang-feng WANG,Yang LAN,Hai-yang YAN,Mei PENG,Si-yu CHEN*()

Key Laboratory of Neutron Physics, Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, China

Received:2022-03-21 Online:2022-12-05 Published:2022-12-01
Contact: Si-yu CHEN E-mail:chensy_nemail@163.com

摘要/Abstract

摘要：

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

Abstract:

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.

Key words: polarized ³He, free induction decay nuclear magnetic resonance (FID NMR), laser detection, Faraday optical rotation effect

中图分类号:

O482.53

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.

Chang-feng WANG,Yang LAN,Hai-yang YAN,Mei PENG,Si-yu CHEN. Laser Detection of Nuclear Magnetic Resonance FID Signal for Polarized ³He System[J]. Chinese Journal of Magnetic Resonance, 2022, 39(4): 459-466.

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极化³He系统核磁共振FID信号的激光探测

Laser Detection of Nuclear Magnetic Resonance FID Signal for Polarized ³He System

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