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Journal of Measurement Science and Instrumentation最新文献

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Measurements and pseudo-measurements in distribution networks 配电网中的测量和伪测量
Journal of Measurement Science and Instrumentation Pub Date : 2001-05-21 DOI: 10.1109/IMTC.2001.929508
M.D. Nimrihter, R. Ciric, A. Slijepčević
{"title":"Measurements and pseudo-measurements in distribution networks","authors":"M.D. Nimrihter, R. Ciric, A. Slijepčević","doi":"10.1109/IMTC.2001.929508","DOIUrl":"https://doi.org/10.1109/IMTC.2001.929508","url":null,"abstract":"The subject of this paper is application of short-term and long-term monitoring of currents on a small number of measuring positions aimed at obtaining a picture of state (currents and voltages) in an overall distribution network. For the state estimation within a longer time period, the Monte Carlo method is used. Quasi-statistical data of loads of consumer nodes are obtained by modeling of a real course of the hours change process of the load current. The results are corrected by means of measured indices of power values on small number of measuring positions. This calculation is done respecting a stochastic nature of load of consumer nodes and estimation of node voltages and currents in network sections. The proposed methodology is tested on a part of the real-life distribution network. The usage of permanent measurement of the section current increases the quality of state estimation in the distribution network.","PeriodicalId":68878,"journal":{"name":"Journal of Measurement Science and Instrumentation","volume":"23 1","pages":"1791-1796 vol.3"},"PeriodicalIF":0.0,"publicationDate":"2001-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81960086","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
Electric field sensing system using a Ti:LiNbO/sub 3/ optical coherence modulator 电场传感系统采用Ti:LiNbO/sub - 3/光相干调制器
Journal of Measurement Science and Instrumentation Pub Date : 2001-05-21 DOI: 10.1109/IMTC.2001.928245
J. Rodríguez-Asomoza, C. Gutiérrez‐Martínez
{"title":"Electric field sensing system using a Ti:LiNbO/sub 3/ optical coherence modulator","authors":"J. Rodríguez-Asomoza, C. Gutiérrez‐Martínez","doi":"10.1109/IMTC.2001.928245","DOIUrl":"https://doi.org/10.1109/IMTC.2001.928245","url":null,"abstract":"This paper describes an experimental set-up for detecting electric fields using an electro-optic LiNbO/sub 3/ sensor and coherence modulation of light. In this system, the detected electric field modulates an optical delay, which is introduced by an electro-optic coherence modulator when associated to a low-coherence optical source. The optical delay acts then as the electric field carrier and is transmitted through an optical fiber channel. At the receiver, the electric field is detected by measuring the autocorrelation of the transmitted light using a two-wave interferometer, which is matched to the optical delay in the sensing modulator.","PeriodicalId":68878,"journal":{"name":"Journal of Measurement Science and Instrumentation","volume":"11 1","pages":"1075-1078 vol.2"},"PeriodicalIF":0.0,"publicationDate":"2001-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81994791","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
Towards an Internet-based virtual-wire environment with virtual instrumentation 利用虚拟仪器实现基于internet的虚拟线路环境
Journal of Measurement Science and Instrumentation Pub Date : 2001-05-21 DOI: 10.1109/IMTC.2001.928191
H. Eren, W. Nichols, I. Wongso
{"title":"Towards an Internet-based virtual-wire environment with virtual instrumentation","authors":"H. Eren, W. Nichols, I. Wongso","doi":"10.1109/IMTC.2001.928191","DOIUrl":"https://doi.org/10.1109/IMTC.2001.928191","url":null,"abstract":"An Internet-based virtual-wire application that uses virtual instrumentation to achieve a continuous control of a closed loop control system is presented. The system acquires data from remote signal sources and publishes them via the Internet in the real-time, while enabling the remote user to send control signals from the web-browser to the server application for the control of a PID based control system. The system involves the development of the server application using LabVIEW graphical programming language and the client application, which is a Java Applet embedded to a HTML format. Problems and limitations of achieving stable continuous control of the system by the remotely located computers are discussed. It was found that continuous control of a real time system via the Internet is possible, but a sustained virtual wire application with the current limitations of Internet technology is impossible.","PeriodicalId":68878,"journal":{"name":"Journal of Measurement Science and Instrumentation","volume":"44 1","pages":"817-820 vol.2"},"PeriodicalIF":0.0,"publicationDate":"2001-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82072711","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
Power measurement under nonsinusoidal and noisy conditions 非正弦和噪声条件下的功率测量
Journal of Measurement Science and Instrumentation Pub Date : 2001-05-21 DOI: 10.1109/IMTC.2001.928234
Jian Qiu Zhang, Yi Shen
{"title":"Power measurement under nonsinusoidal and noisy conditions","authors":"Jian Qiu Zhang, Yi Shen","doi":"10.1109/IMTC.2001.928234","DOIUrl":"https://doi.org/10.1109/IMTC.2001.928234","url":null,"abstract":"Distorted power measurement under nonsinusoidal and noisy conditions is considered. A new window function method which is efficiently combines the advantage of an adaptive window, totally eliminating leakage errors, with that of a conventional window, a good attenuation performance for noise signals, is proposed to reduce the measurement errors of distorted power under nonsinusoidal and noisy conditions. The effectiveness of the new method has been verified by simulation results.","PeriodicalId":68878,"journal":{"name":"Journal of Measurement Science and Instrumentation","volume":"212 1","pages":"1021-1025 vol.2"},"PeriodicalIF":0.0,"publicationDate":"2001-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79441310","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
Structure and frequency adaptation of the recursive adaptive Fourier analyzer based on the Walsh-Hadamard transformation 基于Walsh-Hadamard变换的递归自适应傅里叶分析仪的结构和频率自适应
Journal of Measurement Science and Instrumentation Pub Date : 2001-05-21 DOI: 10.1109/IMTC.2001.928259
C. Benedecsik, A.R. Varkonyikoczy
{"title":"Structure and frequency adaptation of the recursive adaptive Fourier analyzer based on the Walsh-Hadamard transformation","authors":"C. Benedecsik, A.R. Varkonyikoczy","doi":"10.1109/IMTC.2001.928259","DOIUrl":"https://doi.org/10.1109/IMTC.2001.928259","url":null,"abstract":"The measurement of a periodic signal with an unknown basic frequency can be done well with an adaptive Fourier analyzer. This paper presents first a further development of the transform domain adaptive Fourier analyzer, based on the Walsh Hadamard transform, which requires less computation. The frequency determination methods are also studied and a new method is proposed.","PeriodicalId":68878,"journal":{"name":"Journal of Measurement Science and Instrumentation","volume":"14 1","pages":"1148-1153 vol.2"},"PeriodicalIF":0.0,"publicationDate":"2001-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81718301","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
Generalization of a total least squares problem in frequency domain system identification 频域系统辨识中总最小二乘问题的推广
Journal of Measurement Science and Instrumentation Pub Date : 2001-05-21 DOI: 10.1109/IMTC.2001.928779
L. Balogh, I. Koliar
{"title":"Generalization of a total least squares problem in frequency domain system identification","authors":"L. Balogh, I. Koliar","doi":"10.1109/IMTC.2001.928779","DOIUrl":"https://doi.org/10.1109/IMTC.2001.928779","url":null,"abstract":"A solution to the frequency domain system identification of a linear time-invariant system is investigated. A generalization of the total least squares (TLS) algorithm is shown and analyzed. Some simulation examples on real measured data are given, in order to illustrate the properties of the new method in practice.","PeriodicalId":68878,"journal":{"name":"Journal of Measurement Science and Instrumentation","volume":"52 359 1","pages":"8-13 vol.1"},"PeriodicalIF":0.0,"publicationDate":"2001-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83734840","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
Fast clock-jitter simulation in continuous-time delta-sigma modulators 连续时间δ - σ调制器的快速时钟抖动仿真
Journal of Measurement Science and Instrumentation Pub Date : 2001-05-21 DOI: 10.1109/IMTC.2001.929471
P. Bénabès, R. Kielbasa
{"title":"Fast clock-jitter simulation in continuous-time delta-sigma modulators","authors":"P. Bénabès, R. Kielbasa","doi":"10.1109/IMTC.2001.929471","DOIUrl":"https://doi.org/10.1109/IMTC.2001.929471","url":null,"abstract":"A new methodology for clock-jitter simulation in continuous-time sigma-delta (/spl Sigma//spl Delta/) converters is proposed. This analysis method, based on a previously published method uses a discrete time simulator, which is more efficient than an analog simulator. Only one sample per output sample is required which reduces simulation times to a few seconds, even for large simulations. Results are compared to those obtained with time-domain state-equations integration.","PeriodicalId":68878,"journal":{"name":"Journal of Measurement Science and Instrumentation","volume":"12 1","pages":"1587-1590 vol.3"},"PeriodicalIF":0.0,"publicationDate":"2001-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76356381","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
Acoustic emission and vibration for tool wear monitoring in single-point machining using belief network 基于信念网络的单点加工刀具磨损声发射和振动监测
Journal of Measurement Science and Instrumentation Pub Date : 2001-05-21 DOI: 10.1109/IMTC.2001.929463
A. Prateepasen, Y. Au, B. Jones
{"title":"Acoustic emission and vibration for tool wear monitoring in single-point machining using belief network","authors":"A. Prateepasen, Y. Au, B. Jones","doi":"10.1109/IMTC.2001.929463","DOIUrl":"https://doi.org/10.1109/IMTC.2001.929463","url":null,"abstract":"This paper proposes an implementation of calibrated acoustic emission (AE) and vibration techniques to monitor progressive stages of blank wear on carbide tool tips. Three cutting conditions were used on workpiece material type EN24T, in turning operation. The root-mean-square value of AE (AErms) and the coherence function between the acceleration signals at the tool tip in the tangential and feed directions was studied. Three features were identified to be sensitive to tool wear AErms, coherence function in the frequency ranges 2.5-55 kHz and 18-25 kHz. Belief network based on Bayes rule was used to integrate information in order to recognise the occurrence of worn foot. The three features obtained from the three cutting conditions and machine time were used to train the network. The set of feature vectors for worn tools was divided into two equal subsets: one to train the network and the other to test it. The AErms in term of AE pressure equivalent was used to train and test the network to validate the calibrated acoustic. The overall success rate of the network in detecting a worn tool was high with low error rate.","PeriodicalId":68878,"journal":{"name":"Journal of Measurement Science and Instrumentation","volume":"54 1","pages":"1541-1546 vol.3"},"PeriodicalIF":0.0,"publicationDate":"2001-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75622984","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: 16
Crest factor minimisation in the frequency domain 在频域的波峰因子最小化
Journal of Measurement Science and Instrumentation Pub Date : 2001-05-21 DOI: 10.1109/IMTC.2001.928297
M. Solomou, C. Evans, D. Rees
{"title":"Crest factor minimisation in the frequency domain","authors":"M. Solomou, C. Evans, D. Rees","doi":"10.1109/IMTC.2001.928297","DOIUrl":"https://doi.org/10.1109/IMTC.2001.928297","url":null,"abstract":"This paper examines the minimisation of signal crest factor using a frequency domain method. Multisine signals are designed with their relative harmonic phases selected to minimise the distortion introduced by a cubic nonlinearity on the measurement of a frequency response function. This approach is based on the observation that low crest factor signals possess properties that reduce the nonlinear effect. The resulting signals are compared with other types of low crest factor signals. It is found that the technique does not produce the lowest possible crest factors but that the signals do minimise the nonlinear distortion introduced by a cubic nonlinearity. The signals are thus termed minimum distortion multisines.","PeriodicalId":68878,"journal":{"name":"Journal of Measurement Science and Instrumentation","volume":"9 1","pages":"1375-1381 vol.2"},"PeriodicalIF":0.0,"publicationDate":"2001-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81301702","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
Determining bulk density of granular materials from microwave measurements of their dielectric properties 用微波测量颗粒材料的介电特性来测定其体积密度
Journal of Measurement Science and Instrumentation Pub Date : 2001-05-21 DOI: 10.1109/IMTC.2001.929529
S. Trabelsi, A. Kraszewski, S. Nelson
{"title":"Determining bulk density of granular materials from microwave measurements of their dielectric properties","authors":"S. Trabelsi, A. Kraszewski, S. Nelson","doi":"10.1109/IMTC.2001.929529","DOIUrl":"https://doi.org/10.1109/IMTC.2001.929529","url":null,"abstract":"A dielectric method for determining bulk density of granular materials from measurement of their dielectric properties at microwave frequencies is presented. A complex-plane representation of the dielectric properties, normalized to bulk density, is used to generate calibration equations at 7 GHz for cereal grain and seed over wide ranges of moisture content and temperature.","PeriodicalId":68878,"journal":{"name":"Journal of Measurement Science and Instrumentation","volume":"9 1","pages":"1887-1892 vol.3"},"PeriodicalIF":0.0,"publicationDate":"2001-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81523738","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
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