Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169370
Hilton Oliveira de Lima, S. C. Oliveira, E. Fontana
Partial discharges on high voltage insulator surfaces are directly related with the deposition of pollution over the insulators. A complete partial discharge sensor network was previously developed and has been in operation for approximately one year. This paper presents the initial analysis of one year long experiments. A fuzzy inference system was applied on the results to extract a risk level. The risk level was incremented and decremented according to the partial discharge activity and relative humidity levels. The risk level obtained in this can be used to better plan the schedules for preventive maintenance.
{"title":"Fuzzy inference system for risk classification on polluted insulator strings of high voltage transmission lines","authors":"Hilton Oliveira de Lima, S. C. Oliveira, E. Fontana","doi":"10.1109/IMOC.2011.6169370","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169370","url":null,"abstract":"Partial discharges on high voltage insulator surfaces are directly related with the deposition of pollution over the insulators. A complete partial discharge sensor network was previously developed and has been in operation for approximately one year. This paper presents the initial analysis of one year long experiments. A fuzzy inference system was applied on the results to extract a risk level. The risk level was incremented and decremented according to the partial discharge activity and relative humidity levels. The risk level obtained in this can be used to better plan the schedules for preventive maintenance.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129937795","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169380
Fernanda Smith, Francisco Muller, A. Klautau, E. Pelaes
This work presents the simulation and analysis of the impact of impulsive noise on video transmission over ADSL using the Ptolemy II framework. The implemented software modem includes channel coding and modulation used in the ADSL standard and an impulsive noise channel model. In the results, the effect of the use of different interleaver depth values in video transmission is evaluated using two different metrics: peak signal-to-noise ratio and double stimulus impairment scale.
{"title":"Simulation and analysis of the impulsive noise effects in DSL video using Ptolemy II","authors":"Fernanda Smith, Francisco Muller, A. Klautau, E. Pelaes","doi":"10.1109/IMOC.2011.6169380","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169380","url":null,"abstract":"This work presents the simulation and analysis of the impact of impulsive noise on video transmission over ADSL using the Ptolemy II framework. The implemented software modem includes channel coding and modulation used in the ADSL standard and an impulsive noise channel model. In the results, the effect of the use of different interleaver depth values in video transmission is evaluated using two different metrics: peak signal-to-noise ratio and double stimulus impairment scale.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130748696","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169396
V. Soares, Caio Renan Leal de Morais, R. A. de Lima, E. Fontana, J. Martins-Filho
An optical fiber sensor based on harmonic detection for real time monitoring of dissolved gases in the insulating oil of high-voltage transformers has been developed for fault detection. The present work describes contributions to the optimization of the sensor system, using a DFB laser, which is modulated by the local oscillator of a lock-in amplifier, also used for harmonic detection of the spectral line of the gas molecule under test. A detailed study was developed toward sensor optimization by using C2H2 and CO as the test gases.
{"title":"Contributions to the optimization of an optical sensor for acetylene and carbon monoxide","authors":"V. Soares, Caio Renan Leal de Morais, R. A. de Lima, E. Fontana, J. Martins-Filho","doi":"10.1109/IMOC.2011.6169396","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169396","url":null,"abstract":"An optical fiber sensor based on harmonic detection for real time monitoring of dissolved gases in the insulating oil of high-voltage transformers has been developed for fault detection. The present work describes contributions to the optimization of the sensor system, using a DFB laser, which is modulated by the local oscillator of a lock-in amplifier, also used for harmonic detection of the spectral line of the gas molecule under test. A detailed study was developed toward sensor optimization by using C2H2 and CO as the test gases.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130816435","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169289
M. Almeida, R. Souza, R. David, P. Castellanos, J. C. Braz, A. Soledade, F. F. Lima, L. da Silva Mello
This paper describes the experimental setup and presents initial results of medium wave propagation measurements campaigns that are being carried out in Brazil. The experiment is part of a series of field trials that are being conducted by the Brazilian Government to evaluate the performance of DRM standard in this country, which includes campaigns at MW, HF and VHF frequency bands in the cities of São Paulo, Rio de Janeiro and Belo Horizonte. A hybrid signal, composed of an analog AM signal and a digital DRM signal, with the same content, were broadcasted in diurnal and nocturnal transmissions. The results presented here include daytime and nighttime statistics of the measurements performed in São Paulo.
{"title":"Medium wave DRM trials in Brazil — Initial results","authors":"M. Almeida, R. Souza, R. David, P. Castellanos, J. C. Braz, A. Soledade, F. F. Lima, L. da Silva Mello","doi":"10.1109/IMOC.2011.6169289","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169289","url":null,"abstract":"This paper describes the experimental setup and presents initial results of medium wave propagation measurements campaigns that are being carried out in Brazil. The experiment is part of a series of field trials that are being conducted by the Brazilian Government to evaluate the performance of DRM standard in this country, which includes campaigns at MW, HF and VHF frequency bands in the cities of São Paulo, Rio de Janeiro and Belo Horizonte. A hybrid signal, composed of an analog AM signal and a digital DRM signal, with the same content, were broadcasted in diurnal and nocturnal transmissions. The results presented here include daytime and nighttime statistics of the measurements performed in São Paulo.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130927826","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169234
R. S. Penze, J. Rosolem, U. R. Duarte, R. B. Filho
This paper presents a new approach to upgrade the current passive optical network (PON) by using wavelength division multiplexing (WDM) in the standardized optical grid of gigabit PON (In-band WDM PON overlay). The aim is to increase the number of optical distribution networks (ODNs) fed by a single fiber while preserving the users bandwidth. In this approach four downstream (DS) wavelengths signals are transmitted from an optical line terminal (OLT) to four different ODNs using the standard DS PON spectrum ranging from 1480 to 1500 nm. The upstream (US) signals from the four different ODNs are also wavelength multiplexed within the standardized US PON spectrum ranging from 1270 to 1330 nm. Proofs of concept are presented in a 20 km PON serving 32 ONTs in order to demonstrate the feasibility of this proposal.
{"title":"Passive optical network upgrading by using In-band WDM overlay","authors":"R. S. Penze, J. Rosolem, U. R. Duarte, R. B. Filho","doi":"10.1109/IMOC.2011.6169234","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169234","url":null,"abstract":"This paper presents a new approach to upgrade the current passive optical network (PON) by using wavelength division multiplexing (WDM) in the standardized optical grid of gigabit PON (In-band WDM PON overlay). The aim is to increase the number of optical distribution networks (ODNs) fed by a single fiber while preserving the users bandwidth. In this approach four downstream (DS) wavelengths signals are transmitted from an optical line terminal (OLT) to four different ODNs using the standard DS PON spectrum ranging from 1480 to 1500 nm. The upstream (US) signals from the four different ODNs are also wavelength multiplexed within the standardized US PON spectrum ranging from 1270 to 1330 nm. Proofs of concept are presented in a 20 km PON serving 32 ONTs in order to demonstrate the feasibility of this proposal.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125575192","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169298
V. Rodriguez‐Esquerre, Uriel Cruz, C. E. Rubio-Mercedes
Several schemes of light coupling from micro to nano photonic devices are analyzed by using an efficient two-dimensional finite element method (2D-FEM) in the frequency domain, in both, rectangular and cylindrical coordinates in conjunction with the perfectly matched layers (PML).
{"title":"Analysis of micro-to-nano coupling techniques","authors":"V. Rodriguez‐Esquerre, Uriel Cruz, C. E. Rubio-Mercedes","doi":"10.1109/IMOC.2011.6169298","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169298","url":null,"abstract":"Several schemes of light coupling from micro to nano photonic devices are analyzed by using an efficient two-dimensional finite element method (2D-FEM) in the frequency domain, in both, rectangular and cylindrical coordinates in conjunction with the perfectly matched layers (PML).","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123270371","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169322
G. O. Cavalcanti, E. Fontana, Antonio Azevedo
We investigate the performance of Pd films on siloxane underlayer for the development of H2 sensors based on the surface plasmon resonance (SPR) effect. Reflectance measurements were carried out on sputtered Pd films on bare glass and on glass pre-coated with a siloxane layer, using Kretschmann's prism coupling configuration. For most of the range of Pd thicknesses investigated, the sensitivity for H2 detection on bare glass was higher than that on Pd-siloxane, with the maximum sensitivity for the latter matching that on bare Pd. A direct comparison between the sensitivity data for the two multilayer configurations, indicates a trend of improved sensitivity for H2 at higher thickness values for the siloxinated palladium films.
{"title":"Hydrogen detection using surface plasmon resonance on palladium-siloxane films","authors":"G. O. Cavalcanti, E. Fontana, Antonio Azevedo","doi":"10.1109/IMOC.2011.6169322","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169322","url":null,"abstract":"We investigate the performance of Pd films on siloxane underlayer for the development of H2 sensors based on the surface plasmon resonance (SPR) effect. Reflectance measurements were carried out on sputtered Pd films on bare glass and on glass pre-coated with a siloxane layer, using Kretschmann's prism coupling configuration. For most of the range of Pd thicknesses investigated, the sensitivity for H2 detection on bare glass was higher than that on Pd-siloxane, with the maximum sensitivity for the latter matching that on bare Pd. A direct comparison between the sensitivity data for the two multilayer configurations, indicates a trend of improved sensitivity for H2 at higher thickness values for the siloxinated palladium films.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116537059","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169416
S. R. Zang, J. Bergmann
This work considers the synthesis and analysis of dual reflector antennas designed to radiate omnirectional radiation patterns. The reflectors are circularly symmetric concentric surfaces. Here, the case of the main reflector obtained from a circular generating curve is considered. By applying Geometrical Optics approximations, The main reflector is kept fixed and the subreflector is shaped to produce different tilt angle of the main lobe radiation pattern over the horizon line, considering a uniform phase distribution on a conical aperture placed in front of the main reflector. Depending on the type of ray mapping between the reflectors, two kinds of configurations are identified. By employing the aperture method, the performance of these antennas is predicted and a full wave analysis based on Method of Moments analysis is employed to validate these results.
{"title":"Design of omnidirectional dual reflector antenna: Case of the main reflector with circular generatrix","authors":"S. R. Zang, J. Bergmann","doi":"10.1109/IMOC.2011.6169416","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169416","url":null,"abstract":"This work considers the synthesis and analysis of dual reflector antennas designed to radiate omnirectional radiation patterns. The reflectors are circularly symmetric concentric surfaces. Here, the case of the main reflector obtained from a circular generating curve is considered. By applying Geometrical Optics approximations, The main reflector is kept fixed and the subreflector is shaped to produce different tilt angle of the main lobe radiation pattern over the horizon line, considering a uniform phase distribution on a conical aperture placed in front of the main reflector. Depending on the type of ray mapping between the reflectors, two kinds of configurations are identified. By employing the aperture method, the performance of these antennas is predicted and a full wave analysis based on Method of Moments analysis is employed to validate these results.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121809750","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169355
L. S. Araujo, C. P. D. N. Silva, Ludmila Barbosa, A. J. B. D. Oliveira
A novel Sierpinski carpet fractal dipole is here investigated. The new geometry of the fractals used in this study has slots suitably located, so that currents now flow near the edges of the squares which have been defined by the slots, and, as a result, resonances occur at frequencies which correspond to the dimensions of the fractal generator at different scales. The dipole is then verified to operate effectively as a multiband antenna. Simulation results for the return loss, current density distribution and radiation pattern are here reported.
{"title":"A novel Sierpinski carpet fractal dipole","authors":"L. S. Araujo, C. P. D. N. Silva, Ludmila Barbosa, A. J. B. D. Oliveira","doi":"10.1109/IMOC.2011.6169355","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169355","url":null,"abstract":"A novel Sierpinski carpet fractal dipole is here investigated. The new geometry of the fractals used in this study has slots suitably located, so that currents now flow near the edges of the squares which have been defined by the slots, and, as a result, resonances occur at frequencies which correspond to the dimensions of the fractal generator at different scales. The dipole is then verified to operate effectively as a multiband antenna. Simulation results for the return loss, current density distribution and radiation pattern are here reported.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132570455","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}
Pub Date : 2011-10-01DOI: 10.1109/IMOC.2011.6169303
I. F. Dos Anjos, R. Freire, S. Barbin
This work presents the determination of the humidity and the dielectric constant of bentonite using a probe based on the frequency domain reflectometry (FDR) method. The basic principle of the probe used in this study is the measurement of the refractive index of the soil √ε at 100 MHz to allow the determination of the humidity through a known relation between these quantities. The value of 0.99 for the correlation coefficient obtained in this study demonstrated an accurate relationship between the humidity and the dielectric constant of bentonite. Also in this study the humidity of the bentonite using the FDR method was compared to the values obtained using the calcium carbide method.
{"title":"Frequency domain reflectometry in the determination of dielectric constant of bentonite","authors":"I. F. Dos Anjos, R. Freire, S. Barbin","doi":"10.1109/IMOC.2011.6169303","DOIUrl":"https://doi.org/10.1109/IMOC.2011.6169303","url":null,"abstract":"This work presents the determination of the humidity and the dielectric constant of bentonite using a probe based on the frequency domain reflectometry (FDR) method. The basic principle of the probe used in this study is the measurement of the refractive index of the soil √ε at 100 MHz to allow the determination of the humidity through a known relation between these quantities. The value of 0.99 for the correlation coefficient obtained in this study demonstrated an accurate relationship between the humidity and the dielectric constant of bentonite. Also in this study the humidity of the bentonite using the FDR method was compared to the values obtained using the calcium carbide method.","PeriodicalId":179351,"journal":{"name":"2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2011)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132616601","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}
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