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Master's Dissertation
DOI
10.11606/D.76.1995.tde-06022014-095517
Document
Author
Full name
Walter Soto Encinas Junior
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1995
Supervisor
Committee
Li, Maximo Siu (President)
Costa, Luciano da Fontoura
Paiva, Maria Stela Veludo de
Title in Portuguese
Projeto e construção de sistema de aquisição e processamento de dados para espectroscopia por transformada rápida de Fourier
Keywords in Portuguese
Espectroscopia por transformada rápida de Fourier
Sistema de aquisição
Abstract in Portuguese
No presente trabalho procurou-se desenvolver um sistema computacional para a automação de um Espectrofotômetro de Varredura Refrativa. Este sistema é baseado em um computador hospedeiro da linha IBM-PC, que pode ser de qualquer modelo, desde que possua barramento ISA de 16 bits. O sistema se divide em dois módulos - aquisição e processamento. O modulo de aquisição e capaz de atingir taxas de aquisição de ate 200 KHz, com resolução de 12 bits. É independente de controle do hospedeiro pois possui lógica de controle e sistema de armazenamento próprio. O módulo de processamento envolve o uso de um processador vetorial de sinais digitais ZORAN ZR34161 dedicado a efetuar eficientemente a Transformada Rápida de Fourier (FFT). Também opera independentemente do computador hospedeiro. Este módulo é capaz de efetuar a FFT em um vetor real de 4096 pontos em 19,64 ms
Title in English
Project and building of data acquisition system for fast Fourier transform spectrometer.
Keywords in English
Data acquisition system
Fast Fourier transform spectrometer
Abstract in English
This work was intended to develop a computational system to control a fast Fourier spectrophotometer. This system is based in an IBM-PC type host computer, with ISA bus 16 bits wide. The system has two modules - acquisition and processing. The acquisition module works at 200 KHz sample rate, with 12 bits of resolution, and also works without host control, due to its own memory system and control logic. The processing module uses a ZORAN ZR34161 vector signal processor, dedicated to do the Fast Fourier Transform (FFT) in the most efficient way. No management of host is required, and it can compute a FFT of a 4096 points real vector in 19,64 ms
 
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WalterSotoJuniorM.pdf (3.98 Mbytes)
Publishing Date
2014-02-18
 
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