摘要
中国计量科学研究院NIM4#冷原子喷泉钟自2003年8月起已经稳定运行6个月,并于2003年9～12月期间完成了系统频率偏差评定。文中介绍NIM4#钟的喷泉实验、微波频率锁定和对其主要频率特性的实验研究。实验和分析表明,NIM4#钟频率稳定性达8×10-13τ-1 2,复现性达5×10-15,频偏评定不确定度达8.5×10-15。作为旁证,NIM4#与中国计量科学研究院原子时TA(NIM)进行了120天比对,频率偏差在误差范围之内。
The NIM4~# atomic fountain clock has been stably operating for 6 months starting from August of 2003, and a first run evaluation for its systematic frequency deviations was performed during September to December of 2003. The fountain experiments and microwave locking are reviewed, and the experiments certify that the stability is up to 8×10^(-13)τ^(-1/2), reproducibility is up to 5 ×10^(-15), and the evaluation uncertainty of frequency deviation reaches to 8.5×10^(-15). As a collateral evidence, the NIM4~# had been compared with the NIM atomic time TA(NIM) for 120 days and the frequency difference was within the combined uncertainty of NIM4~# and TA(NIM).
出处
《计量学报》
CSCD
北大核心
2004年第3期193-197,共5页
Acta Metrologica Sinica
基金
科技部基础研究专项课题(G99-B-14)
关键词
计量学
时间频率基准
原子钟
冷原子喷泉钟
Metrology
Time and frequency standard
Atomic clock
Cold atomic fountain clock
