秒定义变革及我国时间频率基准的发展和应对  

Redefinition of unit of time and research progress of primary frequency standard in NIM

作　　者：曹士英[1] 房芳[1] CAO Shiying;FANG Fang(Division of Time and Frequency Metrology,National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量科学研究院时间频率计量科学研究所,北京100029

出　　处：《信息通信技术与政策》2022年第7期2-8,共7页Information and Communications Technology and Policy

摘　　要：国际单位制的量子化变革使得除了物质的量的定义外,其他国际单位的定义都与时间单位建立了直接或间接的联系。高准确度的时间频率基准在国民经济建设、国防建设和科学研究中发挥着重要的作用。主要介绍了时间单位的定义从天文秒到原子秒的发展历程以及关于秒定义变革的讨论和对原子钟的要求,并介绍了我国国家计量院在时间频率基准方面的研究工作及应对措施。The redefinition of the International System of Units makes the definitions of other base units directly or indirectly related to the unit of time(second)except that of the amount of substance.High-accuracy time and frequency standards plays an important role in national economy,national defense and scientific research.This paper mainly introduces the development of the definition of the second from astronomical second to atomic second,and the discussion on the redefinition of the second and the requirements for atomic clocks.Finally,it introduces the research work and counter measures of National Metrology Institute of China on time and frequency standards.

关 键 词：秒定义 时间频率基准 铯原子喷泉钟 光钟 

分 类 号：TN99[电子电信—信号与信息处理] O562.3[电子电信—信息与通信工程]