【摘要】 氢原子钟是至今为止除极短时间测量间隔之外最稳定的频率标准 ,由于环境温度的变化及谐振腔老化而引起谐振腔频率的变化 ,导致氢原子钟长期性能降低。为了减小这些影响需借助一种自动调谐器来确保谐振腔的频率始终工作在所需的频率上 ,改善氢原子钟的长期性能 ,日稳定度可达到 1.0× 10 - 1 4 。这篇文章描述了上海天文台研制的氢原子钟的技术改造与性能。更多还原

【Abstract】 The atomic hydrogen clock is the most stable frequency standard generally available today for all but the shortest measuring time interval. 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 1 day.This paper will describe the design improvement and performance of Shanghai Observatory’s atomic hydrogen clock.更多还原