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Proceedings of Conference on Precision Electromagnetic Measurements Digest最新文献

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Measuring the gravitational acceleration by superconducting magnetic levitation system 用超导磁悬浮系统测量重力加速度
Proceedings of Conference on Precision Electromagnetic Measurements Digest Pub Date : 1994-06-27 DOI: 10.1109/CPEM.1994.333247
V. Khavinson, E.T. Frantsuz
{"title":"Measuring the gravitational acceleration by superconducting magnetic levitation system","authors":"V. Khavinson, E.T. Frantsuz","doi":"10.1109/CPEM.1994.333247","DOIUrl":"https://doi.org/10.1109/CPEM.1994.333247","url":null,"abstract":"Summary form only given. A method for the measurement of the acceleration of gravity, which is based on the fact that for fixed vertical position, the frequency of small mechanical oscillations of a superconducting levitated body placed in the nonuniform magnetic field of a coil energized by a direct current is independent of the levitated mass, is proposed. Peculiarities and errors of the method are discussed.<<ETX>>","PeriodicalId":388647,"journal":{"name":"Proceedings of Conference on Precision Electromagnetic Measurements Digest","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123035076","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
Adaptive current sources and feedback applied to the cryogenic current comparator 应用于低温电流比较器的自适应电流源和反馈
Proceedings of Conference on Precision Electromagnetic Measurements Digest Pub Date : 1994-06-27 DOI: 10.1109/19.377831
B. Wood, B. Schumacher
{"title":"Adaptive current sources and feedback applied to the cryogenic current comparator","authors":"B. Wood, B. Schumacher","doi":"10.1109/19.377831","DOIUrl":"https://doi.org/10.1109/19.377831","url":null,"abstract":"A novel current source for the cryogenic current comparator (CCC) is presented which is adaptable to many coil, resistance and filtering configurations. The effect of both current feedback from the SQUID and voltage feedback from the detector are examined and incorporated into the design. The advantages of the new system are examined in terms of flux tracking, leakage, self checking, accuracy and flexibility. The system has been used at NRC over the resistance range of 1 /spl Omega/ to 1 M /spl Omega/.<<ETX>>","PeriodicalId":388647,"journal":{"name":"Proceedings of Conference on Precision Electromagnetic Measurements Digest","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127991222","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: 5
Precision automated capacitance bridges for the low frequency range at the PTB 精密自动电容桥在PTB的低频范围
Proceedings of Conference on Precision Electromagnetic Measurements Digest Pub Date : 1994-06-27 DOI: 10.1109/CPEM.1994.333188
R. Hanke, J. Melcher, A. Muciek, R. Koster
{"title":"Precision automated capacitance bridges for the low frequency range at the PTB","authors":"R. Hanke, J. Melcher, A. Muciek, R. Koster","doi":"10.1109/CPEM.1994.333188","DOIUrl":"https://doi.org/10.1109/CPEM.1994.333188","url":null,"abstract":"Two computer-controlled capacitance bridges for different fields of application have been developed at the PTB. The first one, the universal bridge, works in the capacitance range of less than 1 pF up to 1 /spl mu/F and in a frequency range up to 1 kHz, The total calculated relative uncertainties (2/spl sigma/) are in the order of 5/spl middot/10/sup -6/ and 20/spl middot/10/sup -6/. The second one, the fixed ratio bridge, calibrates primary standards with capacitance values from 1 pF to 1 nF in 1:1, 1:2, 1:5 or 1:10 steps at frequencies from 100 Hz to 10 kHz. The relative uncertainty of one 1:10 step at a frequency of 1592 Hz is estimated to be 3/spl middot/10/sup -8/ (1/spl sigma/).<<ETX>>","PeriodicalId":388647,"journal":{"name":"Proceedings of Conference on Precision Electromagnetic Measurements Digest","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117097668","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
Effect of defocus on near-field measurement of fiber mode field diameters 离焦对光纤模场直径近场测量的影响
Proceedings of Conference on Precision Electromagnetic Measurements Digest Pub Date : 1994-06-27 DOI: 10.1109/CPEM.1994.333197
A. J. Parker
{"title":"Effect of defocus on near-field measurement of fiber mode field diameters","authors":"A. J. Parker","doi":"10.1109/CPEM.1994.333197","DOIUrl":"https://doi.org/10.1109/CPEM.1994.333197","url":null,"abstract":"An instrument has been built that measures the mode field profile of optical waveguides by the near field method. It has been used to measure the effect of defocus on fiber mode field diameters. The results obtained from measurements on two different fibers at two wavelengths are reported.<<ETX>>","PeriodicalId":388647,"journal":{"name":"Proceedings of Conference on Precision Electromagnetic Measurements Digest","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114508342","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
A high precision comparison of the quantized Hall resistance of MOSFET and GaAs/AlGaAs heterostructure devices [measurement units application] MOSFET与GaAs/AlGaAs异质结构器件量化霍尔电阻的高精度比较[测量单元应用]
Proceedings of Conference on Precision Electromagnetic Measurements Digest Pub Date : 1994-06-27 DOI: 10.1109/CPEM.1994.333266
B. Jeckelmann, A. D. Inglis, B. Jeanneret
{"title":"A high precision comparison of the quantized Hall resistance of MOSFET and GaAs/AlGaAs heterostructure devices [measurement units application]","authors":"B. Jeckelmann, A. D. Inglis, B. Jeanneret","doi":"10.1109/CPEM.1994.333266","DOIUrl":"https://doi.org/10.1109/CPEM.1994.333266","url":null,"abstract":"We report comprehensive high precision direct and indirect comparisons of MOSFET and GaAs heterostructure quantized Hall resistors, and of steps 1, 2, 3, 4 and 6 for heterostructure devices. We find no difference between the MOSFET and the heterostructure Hall resistance at a level of better than 1 part in 10/sup 9/ (ppb).<<ETX>>","PeriodicalId":388647,"journal":{"name":"Proceedings of Conference on Precision Electromagnetic Measurements Digest","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114595655","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
Progress report on the linear ion trap extended (LITE) 线性离子阱扩展(LITE)研究进展报告
Proceedings of Conference on Precision Electromagnetic Measurements Digest Pub Date : 1994-06-27 DOI: 10.1109/CPEM.1994.333178
J. Prestage, R. Tjoelker, G. Dick, L. Maleki
{"title":"Progress report on the linear ion trap extended (LITE)","authors":"J. Prestage, R. Tjoelker, G. Dick, L. Maleki","doi":"10.1109/CPEM.1994.333178","DOIUrl":"https://doi.org/10.1109/CPEM.1994.333178","url":null,"abstract":"We discuss an improved architecture for a small ion trap based frequency standard. This design will reduce the size and cost of current Hg/sup +/ standards and improve the long term frequency stability. Based on our earlier work, stability of 7/spl times/10/sup -14///spl radic//spl tau/ is anticipated.<<ETX>>","PeriodicalId":388647,"journal":{"name":"Proceedings of Conference on Precision Electromagnetic Measurements Digest","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116046336","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
Measurement of the absolute frequency of molecular iodine transitions near 532 nm 532 nm附近碘分子跃迁绝对频率的测量
Proceedings of Conference on Precision Electromagnetic Measurements Digest Pub Date : 1994-06-27 DOI: 10.1109/CPEM.1994.333403
P. Jungner, S. Swartz, M. Eickhoff, J. Ye, J. Hall, S. Waltman
{"title":"Measurement of the absolute frequency of molecular iodine transitions near 532 nm","authors":"P. Jungner, S. Swartz, M. Eickhoff, J. Ye, J. Hall, S. Waltman","doi":"10.1109/CPEM.1994.333403","DOIUrl":"https://doi.org/10.1109/CPEM.1994.333403","url":null,"abstract":"The optical frequencies of several transitions in iodine have been measured using the D2 line in Rb 780 nm and an iodine-stabilized 633 nm He-Ne laser. This measurement provides a useful, stable and highly reproducible optical frequency reference in the green.<<ETX>>","PeriodicalId":388647,"journal":{"name":"Proceedings of Conference on Precision Electromagnetic Measurements Digest","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116303696","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
Power and energy meters and their calibration 电能表及其校准
Proceedings of Conference on Precision Electromagnetic Measurements Digest Pub Date : 1994-06-27 DOI: 10.1109/CPEM.1994.333244
P. Miljanic
{"title":"Power and energy meters and their calibration","authors":"P. Miljanic","doi":"10.1109/CPEM.1994.333244","DOIUrl":"https://doi.org/10.1109/CPEM.1994.333244","url":null,"abstract":"Summary form only given. This paper has two sections. In the first section, a description of many details, and of many small but important items, introduced in the electronic circuitry of power and energy meters, is given. Also, the explanation is presented of how the reduction is achieved to voltage and current. The second sections deals with power and energy calibrators and with very accurate instruments built for national and other high precision measurement laboratories. The first section deals primarily with the analog electronic circuitry and the description of the systematic and other error origins. The second section describes the implementation of the digital circuitry and digital computation in the calibration of high precision instruments. As everyone is aware, the calibrators are instruments in which the control problems are essential. In this paper, the author explains his recent views regarding the feedback, error feedforward and error feedback methods, and compares the analog and digital approaches in the realization of these control strategies.<<ETX>>","PeriodicalId":388647,"journal":{"name":"Proceedings of Conference on Precision Electromagnetic Measurements Digest","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114432935","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
Antenna standards and laboratories in Europe 欧洲的天线标准和实验室
Proceedings of Conference on Precision Electromagnetic Measurements Digest Pub Date : 1994-06-27 DOI: 10.1109/19.377849
Jerzy Lemanczyk
{"title":"Antenna standards and laboratories in Europe","authors":"Jerzy Lemanczyk","doi":"10.1109/19.377849","DOIUrl":"https://doi.org/10.1109/19.377849","url":null,"abstract":"The goal of this paper is to present an overview on antenna standards and laboratories within Europe. In this context, Europe will be limited geographically to the member nations of the European Union (EU), formerly the European Community, and the European Space Agency (ESA). In addition to these two instances, other parallel organizations in this field exist such as the Western European Laboratory Accreditation Cooperation (WELAC), the Western European Calibration Cooperation (WECC) which includes EUROMET, the European Collaboration for Measurement Standards and the European Telecommunications Standards Institute (ETSI). And lastly, there are the national standards organizations and laboratories.<<ETX>>","PeriodicalId":388647,"journal":{"name":"Proceedings of Conference on Precision Electromagnetic Measurements Digest","volume":"2004 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127320895","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
Corrections of order /spl alpha//sup 2/(Z/spl alpha/)/sup 5/ to the Lamb shift in hydrogen order /spl alpha//sup 2/(Z/spl alpha/)/sup 5/对氢的Lamb位移的修正
Proceedings of Conference on Precision Electromagnetic Measurements Digest Pub Date : 1994-06-27 DOI: 10.1109/CPEM.1994.333251
M. I. Eides, H. Grotch
{"title":"Corrections of order /spl alpha//sup 2/(Z/spl alpha/)/sup 5/ to the Lamb shift in hydrogen","authors":"M. I. Eides, H. Grotch","doi":"10.1109/CPEM.1994.333251","DOIUrl":"https://doi.org/10.1109/CPEM.1994.333251","url":null,"abstract":"Contributions to the Lamb shift of order /spl alpha//sup 2/(Z/spl alpha/)/sup 5/ induced by all diagrams with closed electron loops are obtained.<<ETX>>","PeriodicalId":388647,"journal":{"name":"Proceedings of Conference on Precision Electromagnetic Measurements Digest","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125931679","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
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