Electrical And Optical Sensors
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Influência dos polieletrólitos na resposta eletroquímica de filmes automontados contendo nanotubos de carbono para aplicação em nanomedicina / Influence the polyelectrolytes on the electrochemical response of layer-by-layer films containing carbon nanotubes for applications in nanomedicine
Carbon Nanotubes (CNTs) are cylindrical carbon nanostructures exhibiting excellent electrical, thermal, optical and mechanical properties. The immobilization of CNTs in nanostructured thin films in conjunction with polymers using the Layer-by-Layer (LbL) technique provides a new alternative for development of nanocomposites to be used as sensors and biosenso
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/06/2011
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2. Síntese e caracterização de derivados do politiofeno para utilização em sensores / Synthesis and characterization of polythiophene derivatives and their use in VOCs sensor applications
The conjugated polymers, especially polythiophenes, have emerged as alternative materials to obtain chemically selective layers in gas sensors. The main advantages of these materials are the possibility of obtaining sensing devices that operate at room temperature and the diversity of materials. For example, a simple modification of the side chain of polythi
Publicado em: 2010
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3. Study of optical and electro-optical properties of diamond-like carbon films - DLC. / Estudo das propriedades ópticas e eletro-ópticas de filmes de carbono amorfo tipo diamante - DLC.
In this work it was studied electrical and optical characteristics of diamond-like carbon (DLC) films deposited in a reactive RF magnetron sputtering system on silicon and glass substrates. Samples were deposited at different process conditions in each type of substrate at two pressure conditions (5 mTorr and 10 mTorr) and four conditions of RF power (100 W,
Publicado em: 2010
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4. Análise experimental da aplicação da tecnologia de rádio sobre fibra em redes IEEE 802.15.4 / Analysis of applying the technology of radio-overfiber networks in IEEE 802.15.4.
This work presents an experimental investigation on the implementation of wireless sensor networks (IEEE 802.15.4) over fiber optics. Such investigation was performed with the utilization of IEEE 802.15.4 transceivers, an optical fiber infrastructure inside a field-trial network, called KyaTera Network, and directly modulated lasers and photodiodes designed
Publicado em: 2009
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5. ProduÃÃo, estabilizaÃÃo e caracterizaÃÃo de redes fotorrefrativas de perÃodo longo em fibras Ãticas para sensores / Production, stabilization and characterization of photosensitive long period gratings in optical fibers for sensors
Este trabalho apresenta a implementaÃÃo do sistema de gravaÃÃo de redes de perÃodo longo, atravÃs da tÃcnica de incidÃncia lateral de radiaÃÃo ultravioleta ponto-a-ponto, no LaboratÃrio de Laser da UTFPR. Foram escritas redes em fibras Ãticas com o uso de um laser de Nd:YAG operando em 266 nm. A evoluÃÃo espectral das redes foi analisada tanto
Publicado em: 2009
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6. Optical detection system of partial discharges on insulator strings of high voltage transmission lines / Sistema de detecÃÃo Ãptica de descargas parciais em cadeias de isoladores de linhas de transmissÃo de alta tensÃo
Leakage current monitoring is frequently used to evaluate the degradation in the insulation capacity of insulator strings of overhead transmission lines, due to pollution. The pollutants accumulation over the surface of the insulators strings, together with humidity, lead to an increase in the current leak over the insulatorâs surface, in turn producing the
Publicado em: 2008
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7. Sistemas computacionais de apoio à monitoração de estruturas de engenharia civil. / Computational systems to support monitoring of civil engineering structures.
This work presents the development of computational systems to support acquisition, visualization, and treatment of data from health monitoring systems of civil structures. With these systems, it is possible to acquire, to visualize, and to filter monitored data. It is also possible to evaluate the influence of temperature, shrinkage and creep in structural
Publicado em: 2007
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8. Lead telluride p-n junctions for infrared detection: electrical and optical characteristics
PbTe mesa diodes were fabricated from a series of p - n junctions grown on BaF2 substrates. For this series, the hole concentration was kept constant at 10(17) cm-3 and the electron concentration varied between 10(17) and 10(19) cm-3. Capacitance versus voltage analysis revealed that for n > 10(18) cm-3, a one-sided abrupt junction is formed. The direct and
Brazilian Journal of Physics. Publicado em: 2006-06
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9. ProduÃÃo de heterojunÃÃes de polianilina/silÃcio e nanofibras de polianilina para aplicaÃÃes em dispositivos hÃbridos
In this work we develop the methodology for the synthesis and fabrication of Polyaniline (PANI) â Silicon (Si) heterojunctions, with great potential for technological applications as sensors in different areas such as optics, ionizing radiation and gas detection. Besides, we were able to implement the electrospinnin technique with the goal of producing poly
Publicado em: 2006
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10. DISTINGUISHING BETWEEN ALCOHOLIC AND NON ALCOHOLIC BEVERAGES IN THE FLOW MEASUREMENT SYSTEM DURING FILLING / DIFERENCIAÇÃO DE BEBIDAS ALCOÓLICAS E NÃO-ALCOÓLICAS NO SISTEMA DE MEDIÇÃO DE VAZÃO (SMV) DURANTE O ENVASE
According to the Brazilian Sindicato Nacional da Indústria de Cerveja (Sindicerv), about R$ 720 million a year used to be lost due to federal and state tax evasion by some beer manufacturers. Tax evasion used to be eased by the method used by the Brazilian federal revenue service (Receita Federal) to monitor the amount of beer manufactured, which was solely
Publicado em: 2005
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11. FabricaÃÃo e caracterizaÃÃo elÃtrica de heterojunÃÃes de polianilina-silÃcio para aplicaÃÃo em dosimetria de radiaÃÃo gama
In this work a technique has been developed to fabricate high quality polyanilinesilicon heterojunction diodes for use as gas and/or ionizing radiation sensors. Polyaniline thin films (40 nm thick) produced by spin-coating on silicon substrates, were the active part of the junction structure. The devices presented excellent reproducibility of their electrica
Publicado em: 2004