Signal Conditioning
Mostrando 13-24 de 50 artigos, teses e dissertações.
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13. Atualização de sistema duplicador de pulsos para teste de proteses de valvulas cardiacas / Upgrade of a pulse duplicator system for cardiac valve prostheses evaluation
It has become very frequent the use of mechanic or biological cardiac valve prostheses. These prostheses must be evaluated (in vitro and in vivo tests) in order to be used clinically. The hydrodynamic performance tests are carried out in vitro. The analyses of the test results are very important for the characterizations and classification of a given prosthe
Publicado em: 2008
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14. Food mechanics: a new device for testing fruits and vegetables
The new mechanical device developed is capable of performing compression tests but also bending, torsion and tensile tests. Its measurement system has the following components: a load cell (0 to 9800 N), a strain gauge signal conditioning board, a plug-in general purpose data acquisition board, and a displacement sensor (0 to 29.7 mm). These components are c
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-03
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15. Circuit of Conditioning of Analogical Signals Programmable for Integrated Systems / Circuito de Condicionamento de Sinais Analógicos Programável para Sistemas Integrados
Em sistemas digitais de medição, circuitos de condicionamento de sinais têm como principal finalidade o ajuste dos sinais analógicos para realização da conversão digital. Para maximização da aplicação de um circuito ou sistema de medição, considerando ainda sua integração em uma única pastilha, esses circuitos têm que ser programáveis, de f
Publicado em: 2007
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16. Controle de uma microturbina a gás com câmara de combustão de baixa emissão de NOx
A number of energy technologies are being employed for distributed generation. When it comes to small scale generation, microturbines are on the cutting edge of thermal technology due to their size, low capital, installation and O&M costs. This work presents the architecture components for the instrumentation, identification and control of a microturbine. Th
Publicado em: 2007
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17. Computerized invasive measurement of time-dependent intraocular pressure
Several methods have been described to measure intraocular pressure (IOP) in clinical and research situations. However, the measurement of time varying IOP with high accuracy, mainly in situations that alter corneal properties, has not been reported until now. The present report describes a computerized system capable of recording the transitory variability
Brazilian Journal of Medical and Biological Research. Publicado em: 2006-09
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18. Design and development of 4-20mA signal conditioner with optical isolation / Projeto e desenvolvimento de um condicionador de sinais com saida 4-20mA com isolamento optico
In this work it is presented the design, development and implementation of a low cost and versatile signal conditioner which is similar to the products available in the Brazilian market, most of them imported. The developed equipment performs the conversion, filtering, isolation and conditioning of small control signals from various types of sensors and tran
Publicado em: 2006
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19. Estudo experimental de um controle adaptativo para um sistema de refrigeração / Experimental study of a refrigeration system using an adaptative control
This research deals with a experimental study of vapor compression refrigeration system, with variable speed compressor using adaptative fuzzy control, comparing its results with On-Off and PI control. The experimental equipment used is composed of a semi-hermetic compressor, concentric tube evaporator and condenser, thermostatic expansion valve with manual
Publicado em: 2006
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20. Estudo experimental de um controle adaptativo para um sistema de refrigeraÃÃo / Experimental study of a refrigeration system using an adaptative control
This research deals with a experimental study of vapor compression refrigeration system, with variable speed compressor using adaptative fuzzy control, comparing itâs results with On-Off and PI control. The experimental equipment used is composed of a semi-hermetic compressor, concentric tube evaporator and condenser, thermostatic expansion valve with manua
Publicado em: 2006
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21. Análise do potencial de calibração da força óptica através de dispositivos de microscopia de força atômica / Analysis of the calibration potential of optical force through atomic force microscopy devices
O microscópio de força atômica é uma ferramenta que possibilita a medida de forças precisamente localizadas com resoluções no tempo, espaço e força jamais vistas. No coração deste instrumento está um sensor a base de uma viga (cantilever) que é responsável pelas características fundamentais do AFM. O objetivo desta pesquisa foi usar a deflexã
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/12/2005
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22. CONTROLE DE ACELERAÇÃO DE UMA MÁQUINA DE VIBRAÇÃO ELETRODINÂMICA / ACCELERATION CONTROL OF AN ELECTRODYNAMIC VIBRATION MACHINE
This work presents the development of a novel digital acceleration controller for sinusoidal vibration tests using switching-mode AC power source (ACPS) fed electrodynamic vibration machines. The proposed scheme is based on the interaction of two control loops: one for the shaker s acceleration regulation and another for the ACPS output voltage control. A ro
Publicado em: 2005
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23. Sensor polimerico de umidade relativa com circuito condicionador de sinais integrado / Polymeric relative humidity sensor with integrated signal conditioning circuit
Este trabalho descreve o desenvolvimento de um sensor de umidade relativa que tem como elemento sensor um polímero (poli(óxido de etileno-co-epicloridrina)84:16), cuja condutividade varia com a umidade. O polímero foi depositado por casting sobre um substrato cerâmico sobre o qual, por sua vez, foram depositados dois eletrodos em forma interdigitada aos
Publicado em: 2005
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24. Analise e controle da energia eletrica atraves de tecnicas de processamento digital de sinais
Considering the areas of Power Quality and Power Conditioning, this work proposes and discusses the use of a Selective Identification Methodology in order to identify the so-called ideal, as well as the disturbing, voltage and current components in a general polyphase power system. Such methodology is presented and described by means of discrete-time signal
Publicado em: 2004