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Master's Dissertation
DOI
10.11606/D.3.2012.tde-21062013-103722
Document
Author
Full name
Maria Elisia Armas Alvarado
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Alayo Chávez, Marco Isaías (President)
Bartoli, Julio Roberto
Benvenho, Adriano Reinaldo Viçoto
Title in Portuguese
Estudo da aplicabilidade do polipirrol no desenvolvimento de um sensor óptico de umidade.
Keywords in Portuguese
Fibras ópticas
Guia de onda ARROW
Polipirrol
Sensor óptico
Umidade
Abstract in Portuguese
O presente trabalho tem como objetivo principal o estudo e o desenvolvimento de um sensor óptico de umidade usando o polímero polipirrol. Inicialmente, estudou-se o princípio teórico dos diversos sensores de umidade encontrados no mercado, assim como fundamentos básicos sobre guias de onda, umidade e polímeros (especialmente polipirrol). Realizou-se também um estudo da influência da umidade nas características físicas e ópticas do polipirrol mediante a técnica elipsométrica. Particularmente, foi estudado em detalhe o comportamento do índice de refração do polipirrol frente a grandes variações de concentrações de umidade, e se demonstrou que o valor do índice de refração do polipirrol aumenta quando exposto a vapor de água. Com os resultados alcançados na caracterização óptica do polímero, foram desenvolvidos sensores de umidade à fibra óptica, baseados na técnica de fibra interrompida, e sensores à guia de onda ARROW (Anti-Resonant Reflecting Optical Waveguide), baseados na técnica de detecção por campo evanescente, sendo o polipirrol usado como camada ativa de sensoriamento. Os dispositivos baseados em fibra óptica e guia de onda ARROW mostraram que a potência de saída dos dispositivos diminui inversamente em relação à umidade relativa (para uma concentração de 50 a 80%).
Title in English
Study of polypyrrole applicability on humidity optical sensor development.
Keywords in English
Fiber optics
Humidity
Optical sensor
Polypyrrole
Waveguide ARROW
Abstract in English
The aim of the present work is the study and development of an optical humidity sensor using polymer polypyrrole. Initially, it was studied theoretical principles of common humidity sensors and it was also studied the theoretical basis of optical waveguides. The first part of the present project involved a study of polypyrrole refractive index behavior when exposed to different humidity concentrations, using the ellipsometric technique. The characterization results showed an increment on polypyrrole refractive index when exposed to water vapor. With these results, a based optical fiber sensor was developed using the air gap configuration, and polypyrrole was used as the sensor element. The last part of the project involved an optical humidity sensor development based on ARROW waveguide (Anti-Resonant Reflecting Optical Waveguide), using the evanescent field configuration. In this case, polypyrrole was also used as the sensor element. These devices (based on optical fiber and ARROW waveguide) showed that the power output decreases inversely with relative humidity concentration (from 50% to 80%).
 
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Publishing Date
2013-06-27
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • Alvarado, M. A., et al. Optical humidity Sensor using Polypyrrole (PPy) [doi:10.1117/12.908485]. In Photonics West 2012 - Optical Components and Materials IX, San Francisco, 2012. Proceedings of the International Society for Optical Engineering - Photonics West 2012., 2012.
All rights of the thesis/dissertation are from the authors
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