2012 European Frequency and Time Forum最新文献_第10页

A small-linewidth absolute optical frequency source 一种小线宽绝对光频源

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502423

S. Raupach, T. Legero, A. Bauch, C. Grebing, C. Hagemann, T. Kessler, A. Koczwara, B. Lipphardt, H. Schnatz, U. Sterr, G. Grosche

引用次数: 0

Investigation of drive level dependencies of higher overtones in SC quartz resonators SC石英谐振器中高泛音驱动电平依赖性的研究

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502372

V. Stofanik, Z. Brezović, M. Minárik

{"title":"Investigation of drive level dependencies of higher overtones in SC quartz resonators","authors":"V. Stofanik, Z. Brezović, M. Minárik","doi":"10.1109/EFTF.2012.6502372","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502372","url":null,"abstract":"In this paper we illustrate our experimental investigations of drive level dependencies of two higher overtones (the 5th and the 7th ones), as well as of the main mode (the 3rd overtone) of several different stress compensated (SC) quartz resonators. The drive level dependencies of basic parameters in the simple Butterworth-Van Dyke one-port equivalent circuit of the particular mode were derived from the impedance vs. frequency responses measured in the vicinity of the particular modes, while temperature of the investigated resonator was maintained approximately at the lower turnover point temperature of the main mode. In the 3rd overtone 10-MHz SC quartz resonators, for example, the 5th overtone or the 7th overtone (the c-modes, i.e. the slow thickness-shear modes of vibration) can be exited simultaneously along with the main c-mode, with assistance of an appropriate dual-mode or multi-mode crystal oscillator (DMXO or MMXO); and the resonator self-temperature-sensing can be reliably implemented [1], [2], [3]. Level of amplitudes of particular modes, which are simultaneously excited in DMXO or MMXO, has impact on short-term, as well as on long-term frequency instabilities of generated signals; hence drive levels of individual c-modes have to be set-up properly in the oscillator circuit.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"20 1","pages":"227-234"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80884512","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: 1

Estimation of COMPASS on-board clock short-term stability 罗盘星载时钟短期稳定性的估计

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502407

H. Gong, Shaojie Ni, Weihua Mou, Xiangwei Zhu, Feixue Wang

引用次数: 3

About time measurements 关于时间测量

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502406

M. Siccardi, M. Abgrall, G. Rovera

引用次数: 5

Optical frequency link between Torino and Firenze for remote comparison between Yb and Sr optical clocks 都灵和佛罗伦萨之间的光学频率链路，用于远程比较Yb和Sr光学时钟

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502410

D. Calonico, C. Clivati, G. Costanzo, A. Godone, F. Levi, Marco Marchetti, A. Mura, M. Prevedelli, M. Schioppo, G. Tino, M. Zucco, N. Poli

引用次数: 4

Two way time transfer with picoseconds precision and accuracy 具有皮秒精度和准确度的双向时间传递

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502429

J. Kodet, I. Procházka, J. Blažej, P. Pánek, U. Schreiber, P. Lauber

{"title":"Two way time transfer with picoseconds precision and accuracy","authors":"J. Kodet, I. Procházka, J. Blažej, P. Pánek, U. Schreiber, P. Lauber","doi":"10.1109/EFTF.2012.6502429","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502429","url":null,"abstract":"The first results of a two way time transfer between two timing devices over modest distances with sub-ps precision and a few ps accuracy were the major tasks of this work. The two way time transfer scheme employing a single coaxial cable was applied. Based on our previous results we have designed and constructed a timing device which allows registration of Times of Arrivals of pulses with sub-ps timing resolution, linearity, and stability. The concept of the timing devices enables to carry out time tagging of pulses of interest in parallel to the comparison of the time scales of these timing devices. The two timing devices were located in different laboratories and buildings within one institution. The common clock 5 MHz was referenced to a Cesium clock. The analysis of systematic errors contribution shows that the accuracy of the time transfer well below 10 ps may be achieved. The time transfer was accomplished over distances of the order of hundreds of meters. The main limitation for longer distances is the quality of the coaxial cable used for time transfer together with the amount of radiofrequency interference within the experiment.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"66 3 1","pages":"483-487"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84686033","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

Development of NPL Rb fountain frequency standard NPL Rb喷泉频率标准的制定

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502342

Y. Ovchinnikov

引用次数: 2

Eight channel embedded electronic open loop interrogation for multi sensor measurement 用于多传感器测量的八通道嵌入式电子开环询问

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502420

D. Rabus, G. Martin, É. Carry, S. Ballandras

{"title":"Eight channel embedded electronic open loop interrogation for multi sensor measurement","authors":"D. Rabus, G. Martin, É. Carry, S. Ballandras","doi":"10.1109/EFTF.2012.6502420","DOIUrl":"https://doi.org/10.1109/EFTF.2012.6502420","url":null,"abstract":"One strategy in addressing the issue of selectivity in direct detection gas sensors - and specifically when using piezoelectric acoustic transducers - is to use multichannel measurement approaches in which each sensor is functionalized with a different chemical layer and provides different responses when exposed to a given mixture of gasses. Within this context, an 8-channel open loop embedded electronics operating as a transmission-mode radiofrequency network analyzer has been developed. The frequency ranges generated by the synthesizer is 50 to 160 MHz or 200 to 500 MHz. A low noise phase detection scheme was implemented, in addition to magnitude measurement. This instrument is used with Surface Acoustic Wave (SAW) and High-overtone Bulk Acoustic Resonator (HBAR) transducers: in the former case, the open-loop approach allows for an improved measurement dynamics, while in the latter case multiple resonances can be probed sequentially, yielding different acoustic penetration depths in the sensing layer. Demonstration of measurement in liquid phase is provided by characterizing the gravimetric sensitivity of HBARs using copper electrodeposition. Values ranging from 2.2 to 13.1 cm2/g are observed, emphasizing a departure from a perturbative Sauerbrey-like relationship.","PeriodicalId":6409,"journal":{"name":"2012 European Frequency and Time Forum","volume":"79 1","pages":"436-442"},"PeriodicalIF":0.0,"publicationDate":"2012-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81212695","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

Phononic crystal sensors 声子晶体传感器

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502366

R. Lucklum

引用次数: 8

Development of QZSS-mobile station qzss移动站的开发

2012 European Frequency and Time Forum Pub Date : 2012-04-23 DOI: 10.1109/EFTF.2012.6502401

H. Narita, J. Amagai, M. Aida, Y. Takahashi, I. Nakazawa, M. Nakamura, H. Ujihara, S. Hama

引用次数: 0