上海天文台近年来氢脉泽的技术改进与性能评价

Design improvement and performance evaluation of the atomic hydrogen maser at Shanghai Observatory in recent years

氢脉泽具有优秀的中长期频率稳定度 ,由于环境温度的变化及谐振腔老化会引起谐振腔频率的变化 ,导致氢脉泽长期性能降低。通过采用自动调谐器可确保谐振腔的频率始终工作在所需的频率上 ,从而改善了氢脉泽的长期性能 ,日稳定度可达到 1.0～ 10 - 14 。

The atomic hydrogen maser has a excellent medium and long term frequency stability. The long term performance typically deteriorates due to frequency drift of high Q resonant cavity and variance of the ambient temperature. We have developed an auto tuning system for tuning the resonant cavity. The experiments show that the auto tuning system allows frequency stability of 1×10 -14 for a period of l day. This paper will describe the design improvement and performance of Shanghai Observatorys atomic hydrogen maser.