Optic Sensors
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. Prospects for Developing Low-Cost Optical Fiber Sensors for Liquid-Liquid Interface Detection
Abstract This work examines the prospects of a low-cost retroreflection optical sensor system for detection of the interface between two immiscible liquids, for applications in oil separation tanks. The sensor in its simplest configuration comprises a bare fiber optic tip, cleaved at an angle of 90º relative to the longitudinal fiber axis. The device tested
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. Case study of muscle fatigue in parafunctional patient using occlusal device with fiber Bragg grating sensors
Abstract This case study describes a new method using a fiber optic Bragg grating sensor to determine muscle fatigue in a patient wearing a resilient occlusal device for the treatment of bruxism symptoms. Four tasks performed at maximum bite force induced rapid exhaustion for the analysis of fatigue. The results show that it is possible to obtain a better un
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-06
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3. Monitoring structures with optical fibers: infiltration detection
ABSTRACT The use of sensors and optical fibers for monitoring structures is continuously growing. Strains, displacements, accelerations, temperatures are just a few of the monitoring possibilities. In the case of dam structures, concrete face rockfill dams constitute a type of structures where the monitoring of water infiltrations is of particular interest.
An. Acad. Bras. Ciênc.. Publicado em: 2018-04
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4. MONITORING CORROSION DEFECTS IN PLANAR STRUCTURES WITH FIBER BRAGG GRATING SENSORS / MONITORAÇÃO DE DEFEITOS POR CORROSÃO EM ESTRUTURAS PLANAS UTILIZANDO SENSORES A REDE DE BRAGG
O foco do presente trabalho é a detecção e o monitoramento de defeitos tais como perda de espessura por corrosão ou dano produzido por impacto em painéis metálicos planos. O sistema proposto emprega sensores de deformação a fibra óptica baseados em redes de Bragg, que possuem alta capacidade de multiplexação. O campo de deformações produzido na
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/10/2011
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5. 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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6. A new technique for interrogating fiber optic sensors with Bragg gratings / Uma nova tecnica para interrogação de sensores a fibra otica com grades de Bragg
The recent advances in fiber optics and eletronic circuits has led to the development of many sensors based on fiber optics, with a great emphasis on Fiber Bragg Gratings (FGB) sensors. The FGBs sensors are used to quantify severeal measurands, as temperature, pressure, tension, thermodynamics and electrical current, with good accuracy and resolution. In thi
Publicado em: 2009
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7. AvaliaÃÃo das forÃas ortodÃnticas utilizando sensores de fibra Ãtica
Fibre Bragg gratings and polymer optical fibre sensors we used to investigate orthodontic forces. These sensors offer advantages for their use due to the reduced dimensions, chemical inertness, dielectric structure, high sensitivity and compatibility. The measured signal is the wavelength position of the peak in the optical reflection spectra of the Bragg se
Publicado em: 2008
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8. Síntese, caracterização e aplicação de polímeros conjugados derivados de ferroceno e de bisfenol-A / Synthesis, characterization and application of conjugated polymers derived from ferrocene and bisphenol-A
Owing to the current interest in organometallic polymers and their applications, a group of conducting polymers containing ferrocene in the main chain was synthesized aiming the study of their magnetoresistive, magneto-optic and redox properties. The following polymers were prepared via McMurry method: poly(1,1-ferrocenylenevinylene) (PFV) and poly[1,1-ferro
Publicado em: 2008
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9. Development of dissolved oxygen sensors using electrochemical and optic methods for real time monitoring of water quality. / Desenvolvimento de sensores de oxigênio dissolvido utilizando métodos eletroquímicos e ópticos para monitoramento em tempo real da qualidade da água.
This work aims the development of a dissolved oxygen (DO) sensor using thick film technology, which has low cost of production and keeps sensors durability and precision acceptable for their use in the monitoring of water sources. This development also includes the complete electronic circuits for autonomous monitoring. Using the principles of oxygen electro
Publicado em: 2007
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10. Polimetalates porphyrins with ruthenium phosphinics complex to application in homogeny catalyze, Non Linear Optic and Langmuir-Blodgett film preparation / Porfirinas polimetaladas com complexos periféricos de rutênio com aplicações em catálise homogênea, óptica não linear e montagem de filmes de Langmuir-Blodgett
A novel metaloporphyrin with ruthenium complexes, {H2-TPyP[RuCl(dppb)(Xbipy)] 4}(PF6)4 and {M-TPyP[RuCl(dppb)(X-bipy)]4}(PF6)4, (where M = Mn(III), Co(II) and Zn(II), X = Me- MeO- and Cl-) has been synthesized and structurally characterized by 31P{1H} magnetic resonance, UV-Vis and IR spectroscopy, cyclic voltammetry and CHN. The catalytic activity of {Mn-TP
Publicado em: 2007
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11. Modelagem endoscÃpica virtual do monitoramento de equipamentos elÃtricos de alta tensÃo
With the promulgation of the 10.847/2004 and 10.848/2004 Laws, the Brazilian Power Sector started adopting competitiveness as the main element for obtaining concessions in the electric power system transmission and generation sectors. In this sense, the power sector companies will have to strongly intensify the monitoring processes of the power system equipm
Publicado em: 2007
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12. Preparação e caracterização de pentóxido de vanádio mesoporoso e reações de intercalação / Synthesis and characterization of mesoporous vanadium pentoxide and intercalation reaction
Synthesis, characterization of vanadium pentoxide mesoporous and studies of properties of hybrids compound based on vanadium oxide xerogel and vanadium pentoxide mesoporous, intercalated with guest species have been the main of this thesis. The interest in those materials, that present a considerable structural and chemical modification, is due to the possib
Publicado em: 2007