Progress of the NTSC-F1 primary frequency standard

• 作者: CHEN Jiang GUAN Yong LIN Rui LIU Dandan RUAN Jun SHI Junru WANG Xinliang YU Fengxiang ZHANG Hui ZHANG Shougang
• 来源期刊: 仪器仪表学报：英文版
• 学科: 工学
• 关键词: PRIMARY FREQUENCY standard FREQUENCY stability FREQUENCY uncertainty.
• 年，卷（期）: 2015,（4）
• 页码范围: 16-27
• 页数: 12页
• 分类号: TM935.11

摘要

The SI "second"is realized by caesium primary frequency standards( PFSs) using laser cooled atoms in a fountain configuration. Four sub systems and operation procedure of the NTSC-F1 primary frequency standard are introduced in the paper.The frequency stability of NTSC-F1 is 3.0×10-13/ τ-1 / 2compared to hydrogen maser. Four terms of frequency shift and uncertainty including second order Zeeman frequency shift,cold collision shift,gravity shift and blackbody shift are evaluated. The improvement of NTSC-F1 is introduced.