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Master's Dissertation
DOI
https://doi.org/10.11606/D.18.2006.tde-26022007-104240
Document
Author
Full name
Leandro Lima
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2006
Supervisor
Committee
Altafim, Ruy Alberto Correa (President)
Basso, Heitor Cury
Ribeiro, Cacilda de Jesus
Title in Portuguese
Termo eletretos de teflon FEP como transdutores piezelétricos
Keywords in Portuguese
Coeficiente piezelétrico
Piezeletricidade
Teflon FEP
Termo eletreto
Transdutor piezelétrico
Abstract in Portuguese
Os termo eletretos piezelétricos de teflon FEP apresentam-se como elementos que podem competir em preço e funcionalidade com os transdutores atuais. Quando carregados impulsivamente, as folhas de teflon FEP retêm cargas elétricas superficiais por um período longo, superior a 500 anos. Excitados mecanicamente, resultam em um alto nível de sinal elétrico e, excitados eletricamente, retornam a energia em deformação mecânica. O processo de fabricação projetado envolve a produção de um transdutor piezelétrico com uma densidade superficial de carga uniforme, através da formação de vacúolos gasosos formados sobre a superfície do filme polimérico. Os altos índices piezelétricos dos transdutores fabricados são confirmados por um sistema de medição estático, também projetado e desenvolvido neste trabalho, onde o coeficiente piezelétrico é medido de maneira direta.
Title in English
Thermo electrets of teflon FEP as piezoelectric transducers
Keywords in English
Piezoelectric coefficient
Piezoelectric transducer
Piezoelectricity
Teflon FEP
Thermo electret
Abstract in English
The thermo-formed electrets of teflon FEP films are shown as elements that can be competitive either in price and functionality matters, as per the transducers being used nowadays. Once charged by an impulse voltage, the teflon FEP sheets keep the superficial electric charges for long periods, up to 500 years. Mechanically excited, they result in a high electric signal and, once electrically excited, return in a mechanical deformation. The projected manufactory process includes the production of a piezoelectric transducers with uniformly charged superficial density, though the formation of gaseous vacuoles over the polymeric film surface. The high piezoelectric levels of the manufactured transducers are confirmed by a static measurement system, also projected and developed in this same work, where the piezoelectric coefficient is measured by a direct way.
 
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Leandro_Lima.pdf (1.52 Mbytes)
Publishing Date
2007-02-27
 
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