发布求助
文献互助 智能选刊 最新文献

Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052)最新文献

筛选
英文 中文
Frequency-controlled sources of far-infrared radiation for spaceborne applications 用于星载应用的频率控制远红外辐射源
Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052) Pub Date : 2000-07-26 DOI: 10.1109/FREQ.2000.887419
M.C. Gaidis, K. Lee, L. Samoska, R. Wyss
{"title":"Frequency-controlled sources of far-infrared radiation for spaceborne applications","authors":"M.C. Gaidis, K. Lee, L. Samoska, R. Wyss","doi":"10.1109/FREQ.2000.887419","DOIUrl":"https://doi.org/10.1109/FREQ.2000.887419","url":null,"abstract":"Among the difficulties in developing far-infrared (FIR) technology, a perennial lack of frequency-controlled sources has kept this spectral region's technology far behind that of the surrounding spectral regions. However, as is the case in other spectral regions, astronomers and atmospheric scientists drive much of the cutting-edge technology development in the FIR. The dramatic attenuation of FIR radiation by water and other constituents of the Earth's atmosphere forces many of the scientists' measurement platforms above the atmosphere, into space. Therefore, there is a strong correlation between the development of new FIR technology and spaceborne instrumentation. In this paper, we address the needs of the FIR space-flight community, providing an introduction to the common heterodyne receiver configurations and the state of technology for various front-end components. We make frequent reference to the added challenges of producing such receivers for space environments.","PeriodicalId":294110,"journal":{"name":"Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114203952","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
Effect of aliasing on spurs and PM noise in frequency dividers 混叠对分频器杂散和PM噪声的影响
Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052) Pub Date : 2000-06-09 DOI: 10.1109/FREQ.2000.887414
A. Sengupta, F. Walls
{"title":"Effect of aliasing on spurs and PM noise in frequency dividers","authors":"A. Sengupta, F. Walls","doi":"10.1109/FREQ.2000.887414","DOIUrl":"https://doi.org/10.1109/FREQ.2000.887414","url":null,"abstract":"We show that the noise and spurious signals over the entire input frequency response of a binary digital divider contribute with equal weight to the output signal. Similar results are also obtained using non-binary digital dividers. We present a simple model that allows one to understand the mechanisms that produce these aliasing effects. Only filters at the input or intermediate stages of division can reduce these effects in digital dividers. We also show that direct-digital-synthesis where the output of a counter is used to drive a shift register and a digital-to-analog converter to produce a sinewave output is largely free from these effects.","PeriodicalId":294110,"journal":{"name":"Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123909749","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: 8
A novel polymer nanofiber interface for chemical sensor applications 一种用于化学传感器的新型聚合物纳米纤维界面
Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052) Pub Date : 2000-06-09 DOI: 10.1109/FREQ.2000.887329
S.J. Kwoun, R. M. Lec, B. Han, F. Ko
{"title":"A novel polymer nanofiber interface for chemical sensor applications","authors":"S.J. Kwoun, R. M. Lec, B. Han, F. Ko","doi":"10.1109/FREQ.2000.887329","DOIUrl":"https://doi.org/10.1109/FREQ.2000.887329","url":null,"abstract":"Thin films are often employed in sensors in order to improve their performance. It is well known that the sensitivity of a film is proportional to the surface area of the film per unit mass. Thin films made of nanofibers (NF) have surface area approximately one to two orders of the magnitude larger than continuous films, and therefore their sensitivities are potentially as large. In this paper we report preliminary results on the use of nanofiber films as a sensing interface for the Thickness Shear Mode (TSM) piezoelectric sensors. The TSM sensors coated with nanofiber films made of Poly-Lactic Acid-co-Glycolic Acid (PLAGA) polymers were studied under various ambient conditions and the important operating parameters have been determined. Applications of the TSM-NF sensors for gas and liquid detection have been discussed.","PeriodicalId":294110,"journal":{"name":"Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124042088","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: 17
Langasite-type materials: from discovery to present state langasite型材料:从发现到现在的状态
Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052) Pub Date : 2000-06-09 DOI: 10.1109/FREQ.2000.887343
B. Mill, Y. Pisarevsky
{"title":"Langasite-type materials: from discovery to present state","authors":"B. Mill, Y. Pisarevsky","doi":"10.1109/FREQ.2000.887343","DOIUrl":"https://doi.org/10.1109/FREQ.2000.887343","url":null,"abstract":"A review of the results on synthesis, crystal chemistry, single crystal growth of langasite family compounds up to the present day is presented together with a discussion of the main electromechanical parameters of the materials and structure-property correlations.","PeriodicalId":294110,"journal":{"name":"Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127778392","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: 68
A review of sensor sensitivity and stability 传感器灵敏度和稳定性研究进展
Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052) Pub Date : 2000-06-09 DOI: 10.1109/FREQ.2000.887325
J. Vig, F. Walls
{"title":"A review of sensor sensitivity and stability","authors":"J. Vig, F. Walls","doi":"10.1109/FREQ.2000.887325","DOIUrl":"https://doi.org/10.1109/FREQ.2000.887325","url":null,"abstract":"Acoustic sensor sensitivity is often reported in units of Hz per unit of measurand. It has been frequently stated or implied in the sensor literature that higher-frequency sensors are preferable to lower frequency sensors because the frequency change per unit of measurand is higher, i.e., the higher-frequency sensors are more \"sensitive\". This paper reviews the resonator instabilities that lead to the conclusions that: 1) sensitivity expressed as Hz per unit of measurand is not a good measure of sensor quality, and 2) when compared on the bases of accuracy, reproducibility and resolution capability, \"good\" low frequency sensors are often superior to \"good\" high frequency ones.","PeriodicalId":294110,"journal":{"name":"Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132130203","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: 81
Simple solution-concentration sensor with temperature compensation using ultrasonic waves 使用超声波进行温度补偿的简易溶液浓度传感器
Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052) Pub Date : 2000-06-09 DOI: 10.1109/FREQ.2000.887334
K. Ikeda
{"title":"Simple solution-concentration sensor with temperature compensation using ultrasonic waves","authors":"K. Ikeda","doi":"10.1109/FREQ.2000.887334","DOIUrl":"https://doi.org/10.1109/FREQ.2000.887334","url":null,"abstract":"This paper describes how a simple new ultrasonic solution-concentration sensor works when using a phase difference method with temperature compensation. This technique relies on sound velocity changes due to variations in solution concentration. An empirical equation of the sound velocity for both the sugar and NaCl solutions, which covered a concentration range of 0.0-20.0% and a temperature range of 15-45/spl deg/C, was obtained by analyzing the measurements of various sound velocities through the least squares method. It has become clear that quite the same temperature-compensation factor can be used for both solutions in terms of dependence on temperature in their equations. An empirical equation was applied to design a temperature compensation circuit. The sensor system with temperature compensation was shown to yield a 0.01% accuracy of concentration determination, independent of the temperature variation of /spl plusmn/1.0/spl deg/C around 25.4/spl deg/C for the NaCl solution and of /spl plusmn/0.9/spl deg/C around 25.2/spl deg/C for the sugar solution.","PeriodicalId":294110,"journal":{"name":"Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052)","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134621477","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: 9
Nonlinear dependencies and phase noise in precision crystal oscillator 精密晶体振荡器的非线性依赖和相位噪声
Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052) Pub Date : 2000-06-07 DOI: 10.1109/FREQ.2000.887415
D. Bogomolov, E.A. Silaev
{"title":"Nonlinear dependencies and phase noise in precision crystal oscillator","authors":"D. Bogomolov, E.A. Silaev","doi":"10.1109/FREQ.2000.887415","DOIUrl":"https://doi.org/10.1109/FREQ.2000.887415","url":null,"abstract":"A quantitative estimation of the influence of an active device operational mode on the phase fluctuations in precision voltage controlled crystal oscillator at frequency range 100 MHz had been made. The relations between the coefficient of amplitude to phase noise conversion and the ratio of the device linear mode realm to the non-linear mode realm are evaluated. The recommendations obtained with the help of numerical analysis have allowed us to optimize operation of the precision voltage controlled crystal quartz oscillator, and to obtain short-term frequency stability close to the stability of a non-controlled oscillator.","PeriodicalId":294110,"journal":{"name":"Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115169011","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
Characterization of a cold cesium source for PARCS: primary atomic reference clock in space PARCS冷铯源的表征:空间主原子参考时钟
Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052) Pub Date : 2000-06-07 DOI: 10.1109/FREQ.2000.887431
T. Heavner, L. Holberg, S. Jefferts, J. Kitching, W. Klipstein, D. Meekhof, H. Robinson
{"title":"Characterization of a cold cesium source for PARCS: primary atomic reference clock in space","authors":"T. Heavner, L. Holberg, S. Jefferts, J. Kitching, W. Klipstein, D. Meekhof, H. Robinson","doi":"10.1109/FREQ.2000.887431","DOIUrl":"https://doi.org/10.1109/FREQ.2000.887431","url":null,"abstract":"The PARCS (Primary Atomic Reference Clock in Space) project is a joint NIST-JPL-University of Colorado venture aimed at placing a cesium (Cs) atomic clock aboard the International Space Station (ISS). This orbiting clock will achieve high accuracy, in part due to the long Ramsey times afforded by the microgravity environment, and allow for precision tests of fundamental physics including relativity theory. As part of this effort, we are evaluating the characteristics of a prototype cold Cs source based on launching atoms from an optical molasses. The apparatus described will be used to develop other PARCS components such as the microwave cavity structure and detection systems, and to investigate two-dimensional cooling schemes for future Cs fountains and space clocks.","PeriodicalId":294110,"journal":{"name":"Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127149847","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
Analysis of high velocity pseudo-surface acoustic waves (HVPSAW) in quartz periodic structures with electrode fingers 带电极指的石英周期结构中高速伪表面声波(HVPSAW)分析
Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052) Pub Date : 2000-06-07 DOI: 10.1109/FREQ.2000.887370
Y. Yong, S. Kanna
{"title":"Analysis of high velocity pseudo-surface acoustic waves (HVPSAW) in quartz periodic structures with electrode fingers","authors":"Y. Yong, S. Kanna","doi":"10.1109/FREQ.2000.887370","DOIUrl":"https://doi.org/10.1109/FREQ.2000.887370","url":null,"abstract":"A finite element study of the piezoelectric Lagrangean equations for frequency-temperature behavior was performed for a two-dimensional periodic high velocity pseudo surface acoustic wave (HVPSAW) structure of quartz. Plane strain assumptions were used to enable a two-dimensional analysis of straight crested HVPSAW in the structure. The HVPSAW modes found on a partially metallized substrate surface has a symmetric electric potential field, therefore, the modes can be driven by the usual IDT array. The attenuation of the HVPSAW mode is strongly affected by both the electrode height and crystal cut angles. Strong KVPSAW modes with good frequency-temperature behavior can be obtained by a proper combination of electrode material, electrode height and the substrate cut angle. The HVPSAW mode is \"leakier\" than its PSAW counterpart.","PeriodicalId":294110,"journal":{"name":"Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126833583","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: 8
Activity dips in FC-cut resonators from interaction with A modes at twice the frequency 在两倍频率下与A模式相互作用时，fc切割谐振器的活动下降
Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052) Pub Date : 2000-06-07 DOI: 10.1109/FREQ.2000.887376
E. P. Eernisse
{"title":"Activity dips in FC-cut resonators from interaction with A modes at twice the frequency","authors":"E. P. Eernisse","doi":"10.1109/FREQ.2000.887376","DOIUrl":"https://doi.org/10.1109/FREQ.2000.887376","url":null,"abstract":"The FC-cut historically has been fraught with activity dips. However, interest in its use has been revived in a recent application where acceleration sensitivity has been found to be particularly low for this cut vs. other cuts. An analysis has been done to explore the source of the activity dips. Results for the A, B, and C modes of a 10 MHz, 3/sup rd/ overtone, plano-convex design indicate that the 3/sup rd/ overtone A mode family has slightly complex wavenumber and is in the vicinity of 20 MHz, which is 2/spl times/ the desired 10 MHz operating frequency. Experimental measurements show that the 3/sup rd/ overtone A mode is indeed poorly energy trapped, but has a number of low Q anharmonic modes within a few kHz of 20 MHz. The A mode frequencies have a strong negative temperature coefficient and cross the exact 2/spl times/ relationship with the 10 MHz 3/sup rd/ overtone C mode at several temperatures ranging from 25 to 100/spl deg/C. It was possible to watch activity dips occur on the spectrum analyzer in the 10 MHz 3/sup rd/ overtone C mode signal during cooling or warming as the different 3/sup rd/ overtone A modes moved with temperature through the 2/sup rd/ relationship. Calculations of the anharmonic frequencies with changes in diopter follow experimental data obtained from units with different diopters. The experimental and theoretical data lead to the conclusion that it is possible to choose diopter designs to ensure ovenized crystal oscillators free of activity dips at oven temperatures. However, the results show that it is not practical to expect the FC-cut to operate without activity dips over large temperature ranges such as the warmup of an ovenized oscillator from room temperature. Crystal designers will have to take into consideration that a 2/spl times/ relation between the desired mode and an interfering mode causes activity dips when designing other crystallographic orientations and calculate all three mode families to look for a 2/spl times/ relationship.","PeriodicalId":294110,"journal":{"name":"Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117011167","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: 11
下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信