Optical Sensors
Mostrando 13-24 de 95 artigos, teses e dissertações.
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13. Hardware embedded fiber sensor interrogation system using intensive digital signal processing
The description of an interrogation system for fiber Bragg grating sensors is reported. The full implementation in hardware of the required signal processing is proposed and made publicly available. The hardware description is implemented in a field programmable gate array (FPGA) development kit and the processing units allow one to control an optoelectronic
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2014-12
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14. A technique to package Fiber Bragg Grating Sensors for Strain and Temperature Measurements
This paper reports an effective method of packaging a fiber Bragg grating (FBG) for the simultaneous measurement of temperature and strain. The technique consists of embedding two fiber Bragg grating sensors inside a polymeric material with different geometrical characteristics. The mechanical and thermal characterizations of the optical transducer were perf
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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15. Theoretical and experimental comparison between power and degree of polarization based optical fiber current sensors
This paper presents a theoretical and experimental comparison of two techniques of optical fiber current sensors (OFCS) based on the Faraday Effect: the power and the degree of polarization (DOP) methods. The DOP method is shown to be insensitive to state of polarization (SOP) changes induced by environmental conditions. A maximum variation of 0.4% in the DO
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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16. Sistema para medida simultânea de temperatura e deformação com redes de Bragg em 800 nm / Simultaneous measurement of temperature and strain using fiber Bragg gratings written at 800 nm
In recent years, fiber Bragg gratings (FBGs) have been frequently used as strain and temperature sensors. Several studies have tackled the problem of distinguishing between these two physical parameters using a dual-wavelength sensor. Although these sensors have shown good results, they have a few drawbacks, one of them being the need for two light sources w
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/11/2012
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17. Síntese e caracterização de nanopartículas Fe3O4@Au e desenvolvimento de sensores para aplicações em nanomedicina / Synthesis and characterization of Fe3O4@Au nanoparticles and development of sensors for application in nanomedicine
Along with the development of nanomaterials came the knowledge and design of their unique eletronic, optical and catalitycal properties which may be used for a variety of nanotecnological applications. A special class of nanomaterials with interesting characteristics is represented by the CoreαShell nanoparticles, which combine the physicochemical prop
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/07/2012
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18. Estudo com sensores para a mensuração de falhas nas fileiras de cana-de-açucar (Sacchararum SSP.) / Study with sensors for measuring gaps in the rows of sugar cane (Saccharum ssp.)
Brazil is the world\ s largest producer of sugarcane and has a booming market. Because of the productive potentiality and profitability of sugarcane the interest in site specific management techniques and demand for new technologies are increasing. Therefore this project aims to study options of sensors for measurement and georeferencing of failures, explori
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/09/2011
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19. Estudo da viabilidade para fabricação de fibra óptica polimérica (FOP) por extrusão vertical / Study of the feasibility on manufacturing polymeric optical fiber (POF) by vertical extrusion
Polymeric optical fibers (POF) presents some advantages compared to the glass optical fibers as flexibility, higher numerical aperture (NA), ease in handling and connecting due to their larger diameter and lower cost manufacturing and installation. However, due to their larger transmission losses compared to the main applications of glass fibers, POF are lim
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/08/2011
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20. Interferômetros recuperadores de baixa tensão de meia onda para sistemas interferométricos de luz branca utilizando moduladores eletro-ópticos. / Low half wave voltage recovery interferometers for white light interferometry systems using electrooptic modulators.
O trabalho tem por objetivo o estudo e o desenvolvimento de interferômetros recuperadores com baixa tensão de meia onda utilizando moduladores eletro-ópticos para serem aplicados em sistemas Interferométricos de luz branca. Ele dá continuidade às pesquisas do autor em seu mestrado, em que foi desenvolvido e testado um sistema de sensoriamento eletro-ó
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/08/2011
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21. 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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22. MONITORING FLEXIBLE RISERS WITH OPTICAL FIBER SENSORS / MONITORAMENTO DE RISERS FLEXÍVEIS COM SENSORES A FIBRA ÓPTICA
The interest in structural health monitoring of flexible risers has grown significantly in recent years. For ducts that are already reaching their design life, monitoring systems can provide early warnings of potential failures and also assist the operator in scheduling downtime. Different techniques are being tested by operators of flexible pipes such as au
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/04/2011
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23. Investigação do efeito de grupos periféricos de rutênio sobre as propriedades fotofísicas de porfirinas
In the last few years the search for new organometallic complexes that exhibit large and fast optical responses at UV-Vis and near IR spectrum regions have attracted a considerable interest because of their potential application in devices such as sensors, optical limiters, switches and in medicine, being used as sensitive drugs in photodynamic treatments. A
Publicado em: 2011
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24. Polyol-polyesther matrices containing phthalocyanine derivatives macrocilces / Derivados de ftalocianina em sistemas poliméricos poliéster-poliol
Phthalocyanines are planar macrocycles with the presence of a central metal ion, formed by bridges of nitrogen and substituent groups in the aromatic rings adjacents. A large number of (PI) electrons, molecular symmetry and the possibility to coordinate different metals in nitrogen central atoms allows the use of these compounds in optical devices, light emi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/05/2010