Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.最新文献_第6页

Narrowing laser linewidth using a stabilized optical frequency comb 利用稳定光频梳缩小激光线宽

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1574060

D. Farkas, G. Gabrielse

引用次数: 0

Self-switching vibrating micromechanical filter bank 自开关振动微机械过滤器组

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1573915

Sheng-Shian Li, Yu-Wei Lin, Z. Ren, C. Nguyen

引用次数: 51

Characterizing absorption spectrum of natural rubidium by using a directly modulated VCSEL 用直接调制VCSEL表征天然铷的吸收光谱

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1574002

I. Ben-Aroya, G. Eisenstein

引用次数: 9

Nonmagnetic UHV optical viewports 非磁性特高压光学视孔

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1573947

S. Crane, C. Ekstrom

引用次数: 4

Significance of power flow angle interference due to finite sample dimension in reflection measurements 反射测量中样品尺寸有限引起的功率流角干扰的意义

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1573921

B. Meulendyk, M. D. da Cunha

{"title":"Significance of power flow angle interference due to finite sample dimension in reflection measurements","authors":"B. Meulendyk, M. D. da Cunha","doi":"10.1109/FREQ.2005.1573921","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573921","url":null,"abstract":"Acoustic wave reflection techniques are widely used in extracting the acoustic constants and temperature coefficients of anisotropic crystals. To obtain these constants with the desired precision, care should be taken in the sample preparation, including flatness, parallelism, and surface finishing or polishing. Not so obvious is that along some orientations required for the extraction of elastic constants in anisotropic materials, non-zero bulk acoustic wave (BAW) power flow angles (PFA) occur. Depending on the sample dimensions, spurious reflections due to the PFA can interfere with the desired signal. In this paper we report on the different positions of a transducer/buffer rod excitation unit with respect to a 25 mm Y cut quartz cube and show the influence of the PFA using pulse echo techniques. In this orientation, selected as an example, a longitudinal wave travels with a velocity of 5996.0 m/s. Signals reflected from the back wall of the sample are expected after about 8.32 mus and 16.7 mus. However, additional clear spurious signals occur around 11.6 mus and 19.9 mus. This is a direct consequence of the position of the transducer/buffer rod unit and thus the PFA. The time response and the correlation between the spurious pulses and the PFA in the referred orientation are detailed in the paper. The results obtained indicate that attention should be given to PFA in determining the test sample dimensions when employing pulse reflection techniques for the extraction of elastic constants in anisotropic crystals","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"57 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":"132879172","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: 3

Closed-form solution for SPUDTs SPUDTs的封闭解

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1573918

E. Danicki, F. Hickernell, I. Mateescu

引用次数: 2

Measurements of cesium polarizability in atomic clock via light frequency shift 利用光频移测量原子钟中铯的极化率

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1573944

Jingbiao Chen

引用次数: 2

BIPM comparison of time transfer techniques 时间传递技术的BIPM比较

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1573951

F. Arias, Z. Jiang, W. Lewandowski, G. Petit

引用次数: 37

Phase noise in microwave bridge oscillators 微波桥式振荡器的相位噪声

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1573989

D. Tsarapkin

{"title":"Phase noise in microwave bridge oscillators","authors":"D. Tsarapkin","doi":"10.1109/FREQ.2005.1573989","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573989","url":null,"abstract":"This paper deals with phase noise in low noise microwave oscillators utilizing bridge (differential) networks to increase their effective Q-factor. As such oscillators do not apply an automatic frequency control they are free from auxiliary circuitry self noise influence that, in turn, permits to incorporate successfully any stabilizing resonators including cryogenically cooled ones. Comparing of the microwave bridge oscillator (MBO) phase noise with that one of the classic Leeson's model reveals at least one drastic distinction that demonstrates itself as deep oscillator phase noise decrease at output of a sustaining amplifier beyond a resonant network bandwidth. The effect is explained by fundamental properties of the bridge network where growing detuning leads to a transmission phase shift approaching plusmn180 degree that changes a sign of a feedback for distortions from positive to negative. This feature distinguishes MBO from frequency stabilization schemes using an automatic frequency control. The method permits to improve oscillator close-in phase noise by 10...15 dB. As expected, a room temperature X-band MBO arranged with a SiGe HBT sustaining amplifier and a whispering gallery sapphire resonator could have # as low as -140 dBc/Hz at 1 kHz offset","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"os-38 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":"127779254","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: 6

The inter-American metrology system (SIM) common-view GPS comparison network 美洲计量系统(SIM)共视GPS比较网

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI: 10.1109/FREQ.2005.1574019

M. Lombardi, A. Novick, J. M. Lopez, J. Boulanger, R. Pelletier

{"title":"The inter-American metrology system (SIM) common-view GPS comparison network","authors":"M. Lombardi, A. Novick, J. M. Lopez, J. Boulanger, R. Pelletier","doi":"10.1109/FREQ.2005.1574019","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1574019","url":null,"abstract":"The inter-American metrology system (SIM) consists of national metrology institutes in 34 member nations located throughout North, Central, and South America, and the Caribbean region. Currently, at least ten SIM laboratories pursue time and frequency metrology, and are responsible for maintaining the national time and frequency standards for their respective countries. To benefit these laboratories and advance metrology in the SIM region, we have developed a measurement network to continuously intercompare these standards and to make the data readily accessible to all SIM members. This network utilizes the multi-channel common-view GPS technique and the near real-time exchange of data via the Internet. This paper discusses the challenges of implementing the SIM comparison network, and provides a technical description of the measurement system supplied to participating laboratories. It describes the method used to calibrate the SIM measurement systems, and describes how the measurement results are processed and reported to the laboratories. It presents data collected from comparisons between the national frequency and time standards located in Canada, Mexico, and the United States. It validates these data by comparing them to data collected from previously established time links. It concludes with a discussion of the measurement uncertainties.","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"23 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":"123571856","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: 23