论文部分内容阅读
氢脉泽是至今为止除极短时间测量间隔之外最稳定的频率标准 ,它是射电天文所必需的频率标准。本文讨论了为流动VLBI站研制的新一代氢脉泽的物理结构特点 ,包括对腔泡结构、磁屏蔽、原子束光学系统等采用的新技术。性能测试表明 ,在 80s到 1d之间其频率稳定度优于 1× 10 - 1 4 ,有了较大的提高。
Hydrogen masers are by far the most stable frequency standard except for very short time measurement intervals and are the necessary frequency standards for radio astronomy. This article discusses the physical structure of a new generation of hydrogen gas masers developed for mobile VLBI stations, including new techniques for cavity structures, magnetic shielding, and atomic beam optics. Performance tests show that the frequency stability is better than 1 × 10 - 1 4 between 80s and 1d, which is greatly improved.