Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.最新文献_第8页

A new microwave synthesis chain for the primary frequency standard NIST-F1 一种用于主频标准NIST-F1的新型微波合成链

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573950

T. Heavner, S. Jefferts, E. Donley, T. Parker, F. Levi

引用次数: 13

GPS block IIR clocks in space: current performance and plans for the future 空间GPS块IIR时钟:当前性能和未来计划

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573897

J. Phelan, T. Dass, G. Freed, J. Rajan, J. D'Agostino, M. Epstein

引用次数: 13

The effect of viscosity on thickness-shear and flexural vibrations of crystal plates 粘度对结晶板厚度-剪切和弯曲振动的影响

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573925

Ji Wang, Wenhua Zhao, Jianke Du

{"title":"The effect of viscosity on thickness-shear and flexural vibrations of crystal plates","authors":"Ji Wang, Wenhua Zhao, Jianke Du","doi":"10.1109/FREQ.2005.1573925","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573925","url":null,"abstract":"The vibration analysis of crystal plates has been an essential part of quartz crystal resonator design with Mindlin plate theory for high frequency vibrations. As the vibration frequency of quartz crystal resonators continues climbing to meet new application requirements and resonator design to accommodate more restrictions on device parameters, additional considerations of material properties like the viscosity will provide new ways to study some known phenomena such as nonlinear effect and estimate resonator parameters that are important in circuit applications. With Mindlin plate theory, we consider the elastic constants of quartz crystal are viscous through adding the frequency dependent imaginary part with known experimental data. Then the vibrating plate has complex elastic constants and is frequency dependent with slight difference from linear elastic constants we are familiar with. These equations give dispersion relations and frequency spectra with frequency dependence. We found that the inclusion of complex elastic constants does not change the dispersion relation, consequently the frequency spectra, significantly due to the relatively small viscosity in quartz crystal. However, these results, including the new equations, are essential in the modeling of crystal resonators working at high frequency and estimating basic circuit parameters such as the resistance and quality factor based on material property. These results are also useful in the resonator design and applications, and the new parameters of resonator performance are also important in the continuous efforts in the study of the nonlinear effect of crystal resonators that is believed to be related to the viscosity effect","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"9 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":"128748982","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: 4

Time and frequency activities at the National Measurement Institute, Australia 澳大利亚国家测量研究所的时间和频率活动

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573933

R. B. Warrington, P. Fisk, M. Wouters, M. Lawn, J. S. Thorn, S. Quigg, A. Gajawecra, S. Park

引用次数: 7

Recent progress in GLONASS time transfer 格洛纳斯系统时间传送的最新进展

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1574025

W. Lewandowski, A. Foks, Z. Jiang, J. Nawrocki, P. Nogas

引用次数: 7

Minimizing the required trap depth in optical lattice clocks 最小化光学晶格钟所需的阱深度

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1574062

P. Lemonde, P. Wolf

引用次数: 1

Long term operation, performance and applications of cryogenic sapphire oscillators 低温蓝宝石振荡器的长期运行、性能和应用

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573957

M. Tobar, E. Ivanov, C. Locke, P. Stanwix, J. Hartnett, A. Luiten, S. Bize, G. Santarelli, P. Wolf, A. Clairon

{"title":"Long term operation, performance and applications of cryogenic sapphire oscillators","authors":"M. Tobar, E. Ivanov, C. Locke, P. Stanwix, J. Hartnett, A. Luiten, S. Bize, G. Santarelli, P. Wolf, A. Clairon","doi":"10.1109/FREQ.2005.1573957","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573957","url":null,"abstract":"Cryogenic sapphire oscillators (CSO) developed at UWA have now been in operation around the world continuously for many years. Such oscillators are essential for interrogating atomic frequency standards at the quantum limit of projection noise; otherwise aliasing effects dominate due to the periodic sampling between successive interrogations of the atomic transition. For this reason, UWA oscillators are now operational at NMI (Sydney), LNE-SYRTE (Paris), the French Space Agency (CNES, Toulouse) and at UWA (Perth). Other applications, which have attracted attention in recent years, include tests on fundamental principles of physics, such as tests of Lorentz invariance. This paper reports on the long-term operation, performance of such oscillators. We compare the long-term drift of some different CSO's. The drift rates turn out to be linear over many years and in the same direction. However, the magnitude seems to vary by more than one order of magnitude between the oscillators, ranging from a few parts in 1014 per day to a few parts in 1013 per day","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"16 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":"115266290","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: 0

32KHz MEMS-based oscillator for low-power applications 用于低功耗应用的32KHz mems振荡器

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573992

K. Cioffi, W. Hsu

引用次数: 25

Stress induced performance degradation in LC oscillators 应力诱导的LC振荡器性能退化

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573993

E. Xiao, P. P. Ghosh

引用次数: 1

Liter sized ion clock with 10/sup -15/ stability 升大小的离子时钟，10/sup -15/稳定性

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1573976

J. Prestage, S. Chung, T. Le, L. Lim, L. Maleki

{"title":"Liter sized ion clock with 10/sup -15/ stability","authors":"J. Prestage, S. Chung, T. Le, L. Lim, L. Maleki","doi":"10.1109/FREQ.2005.1573976","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573976","url":null,"abstract":"We have recently completed a breadboard ion-clock physics package based on Hg ions shuttled between a quadrupole and a 16-pole rf trap. With this architecture we have demonstrated short-term stability ~2-3times10-13 at 1 second, averaging to 10-15 at 1 day. This development shows that H-maser quality stabilities can be produced in a small clock package, comparable in size to an ultra-stable quartz oscillator required for holding 1-2times10-13 at 1 second. This performance was obtained in a sealed vacuum configuration where only a getter pump was used to maintain vacuum. We have selected materials for the vacuum tube, ion trap and UV windows that will allow a 450 C tube bake-out to prepare for tube seal-off. This approach to the vacuum follows the methods used in flight vacuum tube electronics, such as flight TWTA's where tube operation lifetime and shelf life of up to 15 years is achieved. We have made a thorough study of residual gas shifts of the ion-clock frequency and a study of alternate noble gasses as a buffer gas within the sealed tube. We find that neon is more suitable than the traditional use of helium, with 2-3 times less pressure induced frequency pulling. Since neon is heavier than helium, negligible diffusion losses will occur over the operation lifetime. We have developed a modular optical system that integrates lens, mirrors, 202Hg lamp and exciter, photomultiplier tube and pulse generation electronics, all into a small package that attaches to the vacuum tube, aligned with its optical ports and ion trap inside. Similarly, the reference magnetic field coil, an inner layer magnetic shield and a 40.5 GHz microwave feed with window have been incorporated into this breadboard","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"5 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":"115533866","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