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Master's Dissertation
DOI
10.11606/D.18.2006.tde-25102006-142648
Document
Author
Full name
Ruy Alberto Pisani Altafim
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2006
Supervisor
Committee
Goncalves Neto, Luiz (President)
Basso, Heitor Cury
Campos, João Sinézio de Carvalho
Title in Portuguese
Análise e implementação de métodos para a caracterização de eletretos termo-formados
Keywords in Portuguese
eletretos
métodos de caracterização de eletretos
polímeros piezoelétricos
Abstract in Portuguese
O objetivo deste trabalho é aplicar os métodos de medidas dinâmicos dos polímeros piezoelétricos na caracterização dos eletretos termo-formados de Teflon-FEP desenvolvidos no Laboratório de Medidas e Padrões da Escola de Engenharia de São Carlos (EESC) - Universidade de São Paulo (USP). Para isso, foram implementados os métodos dinâmico direto, acústico direto, acústico inverso e interferométrico. Também foram desenvolvidos neste trabalho dois aplicativos computacionais de controle e aquisição de dados dos equipamentos de medidas, Lock-in SR510, osciloscópio Tektronix TDS 210 e gerador de áudio Tektronix CFG253. Esta caracterização é importante porque visa utilizar os eletretos termo-formados como dispositivos eletromecânicos para realizar inúmeras aplicações nas áreas da robótica, da bioengenharia e nas medidas elétricas e mecânicas. A vantagem dos eletretos termo-formados com relação aos demais polímeros piezoelétricos, é que estes são estruturas homogêneas, com grande reprodutibilidade no processo de fabricação e apresentam altos coeficientes piezoelétricos.
Title in English
Analysis and implementation of methods for the characterization of thermo-formed electrets
Keywords in English
electrets
electrets characterization methods
piezoelectric polymers
Abstract in English
The aim of this work is to apply the dynamical measurement methods of piezoelectric polymers into the characterization of thermo-formed electrets of Teflon-FEP developed in the Laboratory of Measurements and Standards of the School of Engineering of Sao Carlos (EESC) - University of Sao Paulo (USP). The direct dynamical, direct acoustic, inverse acoustic and interferometric methods are aplyed to implement these measurements. Two routines were also developed to control and realize the data acquisition of the measurement equipments Lock in SR510, Tektronix TDS-210 oscilloscope and Tektronix CFG-253 function generator. The characterization of these termo-formed electret is important because they can be used into electromechanical devices for innumerable applications in the areas such as robotics, bioengineering and electric and mechanic measurements. The advantage of the thermo-formed electrets, compared to all others piezoelectric polymers, is that they are homogeneous structures with reproducible fabrication process, to presenting high piezoelectric coefficients.
 
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Publishing Date
2006-11-08
 
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