| 拉曼激光相位噪声对原子干涉重力仪测量分辨力的影响 |
| Influence of Raman Laser Phase Noise on the Measurement Resolution of Atomic Gravimeter |
| |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
| 中文摘要: |
| 原子干涉重力仪已获得当今g值测量的最高分辨力，使得其在前沿科学研究和精密计量中有广阔的应用前景，但其分辨力的提高受限于包括拉曼激光相位噪声在内的各种噪声。本文通过对拉曼激光相位噪声模型和原子干涉仪中噪声传递过程的研究，发现微波信号源贡献了拉曼激光相位噪声的主要部分；通过计算常见T，τ条件下拉曼激光相位噪声对干涉仪重力测量分辨力的影响，发现100～300 ms内T越大重力仪测量分辨力越高，其中在T =300 ms、τ=20 μs的条件下，单次测量时拉曼激光相位噪声对原子干涉仪相位波动的影响为19.6 mrad，相应对重力仪分辨力的影响为1.35 μGal（1 μGal=10-8 m/s2）。 |
| 英文摘要: |
| Atom interferometer gravimeter has realized state-of-the-art measurement of ‘g’, thus promising it with broad prospects in frontier scientific research and precision metrology. However, its resolution is limited by different sources of noises, such as Raman phase noise. This paper investigates the Raman phase noise model and its transfer process to the phase of atomic interferometer. We find that signal generator contributes the major part of the Raman phase noise. By calculating the contributions of Raman phase noise to the interferometric phase fluctuation under normal conditions of T & τ, we find that the measurement resolution raises as T increases in the range from 100 ms to 300 ms. For instance, we calculate a contribution of 19.6 mrad/shot to the interferometric phase fluctuation under the condition of T=300 ms & τ=20 μs, corresponding to an influence of 1.35 μGal (1μGal=10-8 m/s2) on the resolution of atomic gravimeter in a single measurement circle. |
|
| 中文关键词: 相位噪声 拉曼激光 原子干涉仪 锁相环 |
| 英文关键词:phase noise Raman laser atomic interferometer phase lock loop |
| 基金项目: |
| DOI：10.11823/j.issn.1674-5795.2015.06.04 |
| 引用本文：季俊云,王宇.拉曼激光相位噪声对原子干涉重力仪测量分辨力的影响[J].计测技术,2015,35(6):. |
| 关闭 |
