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Proceedings of the 20th European Frequency and Time Forum最新文献

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171Yb+ single-ion optical frequency standard at 688 THz 171Yb+单离子光学频率标准在688thz
Proceedings of the 20th European Frequency and Time Forum Pub Date : 2006-06-04 DOI: 10.1109/FREQ.2006.275429
C. Tamm, B. Lipphardt, H. Schnatz, R. Wynands, S. Weyers, T. Schneider, E. Peik
{"title":"171Yb+ single-ion optical frequency standard at 688 THz","authors":"C. Tamm, B. Lipphardt, H. Schnatz, R. Wynands, S. Weyers, T. Schneider, E. Peik","doi":"10.1109/FREQ.2006.275429","DOIUrl":"https://doi.org/10.1109/FREQ.2006.275429","url":null,"abstract":"Two <sup>171</sup>Yb<sup>+</sup> single-ion optical frequency standards operating at 688 THz (436 nm) are compared in order to investigate systematic frequency shifts in the sub-Hertz range. In the absence of externally applied perturbations, a mean relative frequency difference of 3.8(6.1)·10<sup>-16</sup> is observed. This agreement is comparable to that of the most accurate comparisons between cesium fountain clocks. Using a femtosecond frequency comb generator based on a Er<sup>3+</sup>-doped fiber laser, the frequency of the <sup>171</sup>Yb<sup>+</sup> standard is measured with a relative systematic uncertainty of 3.1·10<sup>-15</sup> and a statistical uncertainty of 0.6·10<sup>-15</sup>.","PeriodicalId":348089,"journal":{"name":"Proceedings of the 20th European Frequency and Time Forum","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132016637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
On optimizing the configuration of time-transfer links used to generate TAI 用于生成TAI的时间传递链路优化配置
Proceedings of the 20th European Frequency and Time Forum Pub Date : 2006-03-27 DOI: 10.21236/ada464012
D. Matsakis, F. Arias, A. Bauch, J. Davis, T. Gotoh, M. Hosokawa, Dirk Piester
{"title":"On optimizing the configuration of time-transfer links used to generate TAI","authors":"D. Matsakis, F. Arias, A. Bauch, J. Davis, T. Gotoh, M. Hosokawa, Dirk Piester","doi":"10.21236/ada464012","DOIUrl":"https://doi.org/10.21236/ada464012","url":null,"abstract":"Recent work on the uncertainties of [UTC-UTC(k)] has made it possible to quantify the effects of different configurations of the time-transfer links used to generate International Atomic Time (TAI). The optimal topology depends upon the magnitude and character of the time-transfer noise of the relevant systems, the correlations between the time-transfer links, the required degree of robustness, the operational practices and equipment at pivot and crossover sites, and the operational complexity of generating TAI on a routine basis. The authors are members of a study group of the Consultative Committee for Time and Frequency (CCTF) Working Group on TAI that is studying these issues, and this paper will present considerations relevant to the problem.","PeriodicalId":348089,"journal":{"name":"Proceedings of the 20th European Frequency and Time Forum","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126488855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Long term study of the H-maser clocks at the royal observatory of Belgium 比利时皇家天文台对h脉泽钟的长期研究
Proceedings of the 20th European Frequency and Time Forum Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1573939
F. Roosbeek, P. Defraigne
{"title":"Long term study of the H-maser clocks at the royal observatory of Belgium","authors":"F. Roosbeek, P. Defraigne","doi":"10.1109/FREQ.2005.1573939","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573939","url":null,"abstract":"Two hydrogen masers are in operation in the time lab of the Royal Observatory of Belgium. One is a CH1-75 operational since 1991 and the other one is a CH1-76 operational since the 1999. This second one is used to provide a frequency needed by the active HM CH1-75 for the cavity auto-tuning. The stability of the masers since their putting in operation is studied.","PeriodicalId":348089,"journal":{"name":"Proceedings of the 20th European Frequency and Time Forum","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133938997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
New frequency counting principle improves resolution 新的频率计数原理提高了分辨率
Proceedings of the 20th European Frequency and Time Forum Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1574007
S. Johansson
{"title":"New frequency counting principle improves resolution","authors":"S. Johansson","doi":"10.1109/FREQ.2005.1574007","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1574007","url":null,"abstract":"Frequency counters have gone through several evolution stages in their design since their first appearance on the market: Stage 1 until 70-ies Conventional counting Stage 2 1980-ies Reciprocal counting (period measurement + inversion) Stage 3 1990-ies Interpolating Reciprocal Counting Stage 4 2000-ies Multiple Time Stamp Average Continuous Counting. This paper describes the theory and design of frequency counters, and analyses the improvements in the latest generation of frequency counters. The newly introduced high-resolution CNT-90 Timer/Counter/Analyzer from Pendulum Instruments AB in Sweden is used as commercially available example of the latest design technology in this presentation. The advantages of continuous time-stamping technique are discussed, for example regression analysis to reduce effects of measurement noise and to improve resolution to 12 digits for 1s of measuring time. Another example is the ability for seamless back-to-back measurements without missing any period, which is essential for theoretically correct calculation of Allan Deviation.","PeriodicalId":348089,"journal":{"name":"Proceedings of the 20th European Frequency and Time Forum","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129909949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 36
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