摘要
氢脉泽是迄今为止除极短时间测量间隔之外最稳定的频率标准 ,但对于 1 0 4秒或更长的测量时间间隔 ,它的性能由于高Q值谐振腔而引起频率漂移而变坏。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 ,导致氢脉泽长期频率稳定度的降低。为了减小这种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 ,以改善氢脉泽的长期频率稳定度 ,其日稳定度可达 1 0×1 0 - 1 4 。
The hydrogen maser is the most stable frequency standard generally available today for all but the shortest measuring times. For long measuring times of 104 s or longer, its performance typically deteriorates due to frequency drift of high-Q resonant cavity. The long-term frequency stability of hydrogen maser is degraded by the drifts of the resonate cavity. An auto-tuning system for tuning the resonant cavity has been developed. The experiment shows that the auto-tuning system allows frequency stability of 1 × 10-14 for a period of 1 day. This paper describes the performance of Shanghai Astronomical Observatory's hydrogen maser with cavity auto-tuning.
出处
《计量学报》
EI
CSCD
北大核心
2001年第4期314-316,319,共4页
Acta Metrologica Sinica
