基于电子-核子核磁共振陀螺仪的自旋弛豫时间延长研究

The spin relaxation time of atoms is essential to study on atomic gyroscope, atomic magnetometer and atomic clock, et al.. Extending the spin relaxation time is the key technology to promote the performance of atomic instruments. This project is aimed to the high performance of the nuclear magnetic resonance gyroscope (NMRG). We will investigate on effects of atomic spin exchanging and relaxation by the ratio of the gas pressure, magnetic field gradient, working temperature and anti-relaxation coating material from both theory and experiment sides. The principle of the spin relaxation of alkali atomic and noble gas will be explained. The spin relaxation time of noble gas will be extended by 3 to 4 times, more than 20 seconds, which could meet the requirement of navigation grade of NMRG.

原子自旋弛豫时间对于研究原子陀螺仪、原子磁强计、原子钟等原子仪表具有重要意义。延长惰性气体的自旋弛豫时间是提升原子仪表性能的关键技术。本项目以核磁共振陀螺仪对高性能原子气室的需求为牵引，从理论和实验两方面研究气压比例、磁场梯度、工作温度、反弛豫镀膜等因素对原子自旋交换及弛豫的影响，阐明碱金属原子和惰性气体自旋弛豫的物理机制，将惰性气体的横向自旋弛豫时间提升3-4倍，达到20s左右，以满足导航级核磁共振陀螺仪的使用要求。

原子自旋弛豫时间对于研究原子磁强计、原子钟、原子陀螺仪等原子仪表具有重要的意义。延长惰性气体的自旋弛豫时间是提升原子仪表性能的关键技术。项目针对核磁共振陀螺仪对高性能原子气室的需求，从理论和实验两方面研究了原子气室内气压比例、磁场梯度、工作温度等因素对原子自旋交换及弛豫的影响，阐明碱金属原子和惰性气体自旋弛豫的物理机制，将惰性气体的横向自旋弛豫时间由7.5s至50s左右，超出了项目预期研究目标，项目研究的原子气室已经应用于核磁共振陀螺仪研究。