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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2007.tde-28032008-174207
Document
Author
Full name
Maycon Max Kopelvski
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2007
Supervisor
Committee
Ramírez Fernandez, Francisco Javier (President)
Gimenez, Salvador Pinillos
Ibrahim, Ricardo Cury
Title in Portuguese
Sistema de caracterização elétrica de dispositivos emissores de campo.
Keywords in Portuguese
Dispositivos emissores de campo elétrico
Espectrometria de massa
Instrumentação virtual
Abstract in Portuguese
Neste trabalho é apresentado o desenvolvimento de um sistema de ensaios elétricos de dispositivos de emissão de campo para que, a partir desses ensaios, possam ser extraídas as características elétricas desses dispositivos. O sistema é composto por hardware e software dedicados e pode ser controlado local ou remotamente. O hardware inclui uma fonte de alta tensão gerenciada por um sistema microcontrolado. Para programação do microcontrolador, foi utilizado um ambiente de programação disponibilizado pelo próprio fabricante do microcontrolador. Nesse desenvolvimento foram empregados periféricos de entrada e saída do microcontrolador, tais como: leitura de teclado, manipulação de USART, ajuste do nível de saída da fonte e conversores analógicos digitais. No microcontrolador foram implantadas rotinas de configuração, personalização e varredura do display, além de envio e recebimento de informações com um computador. Para o computador foi elaborado um programa dedicado para a manipulação do sistema de ensaio utilizando o conceito de instrumentação virtual, que permite escolher o tipo de ensaio elétrico, armazenar as leituras dos ensaios e a visualização "on-line" do andamento do ensaio através de diversos gráficos disponíveis no programa, inclusive o gráfico de Fowler-Nordheim, adequado para o estudo de dispositivos de emissão de campo.
Title in English
Field emission devices electrical characteristics trial system.
Keywords in English
Curve tracer
Electrical characterization
Field emission
High voltage source
Mass spectrometry
Parameter analyzer
Silicon microtips
Virtual instrumentation
Abstract in English
At this work is presented the development of a field emission devices trial system to render possible to obtain the electrical characteristics of the field emission devices. Here are shown some results taken from some trials. During the development of the trial system, it was used at the programming microcontroller stage, the environment of programming supplied by the manufacturer of the microcontroller. At this development, peripheral of input and output from the microcontroller, like, keyboard reading, USART manipulation, SPI manipulation and analogic to digital converters were used. At the microcontroller were implanted routines of configuration, customing and display sweeping, besides the transmission and the receiving of instructions came from the computer. For computer, a program was elaborated dedicated for manipulation of the trials system applying the virtual instrumentation concept, storing readings of the trials as well as the visualization "on-line" of the course of the trial through available graphs in the program. As an important result of this work has the establishment of a system for trial of field emission devices controlled on place or remotely, system that is composed by hardware and software in which were made several trials with acquisition and data manipulation and the presentation of received information.
 
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Publishing Date
2008-04-07
 
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