@MastersThesis{Ribeiro:2006:SiEsAb,
author = "Ribeiro, Rodolfo Jos{\'e}",
title = "Simula{\c{c}}{\~a}o de espectros de absor{\c{c}}{\~a}o para
determina{\c{c}}{\~a}o de temperaturas em chamas",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2006",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2006-10-17",
keywords = "combust{\~a}o e propuls{\~a}o, espectropia de
absor{\c{c}}{\~a}o, controle de combust{\~a}o, espectroscopia a
laser, simula{\c{c}}{\~a}o computadorizada, an{\'a}lise de
espectros, espectros moleculares, transmit{\^a}ncia,
espectroscopio na chama, absorption spectroscopy, combustion
control, laser spectroscopy, computerized simulation, spectrum
analysis, molecular spectra, transmittance, flame spectroscopy.",
abstract = "Um dos m{\'e}todos n{\~a}o intrusivos para medi{\c{c}}{\~a}o
de temperatura de chamas e concentra{\c{c}}{\~a}o de
esp{\'e}cies que tem sido utilizado com sucesso em trabalhos de
literatura {\'e} a espectroscopia de absor{\c{c}}{\~a}o a laser
de diodo. Para c{\'a}lculo da temperatura, basicamente s{\~a}o
comparados espectros de absor{\c{c}}{\~a}o de mol{\'e}culas
presentes na chama (a grande maioria utilizando a mol{\'e}cula de
{\'a}gua) com espectros simulados teoricamente. Neste trabalho,
foi desenvolvido um programa de simula{\c{c}}{\~a}o de espectros
de absor{\c{c}}{\~a}o de alta resolu{\c{c}}{\~a}o de
mol{\'e}culas a partir das bases de dados HITRAN (HIgh-resolution
TRANsmission molecular absorption database) e HITEMP
(HIgh-TEMPerature spectroscopic absorption parameters). A base de
dados HITRAN apresenta, dentre outros, dados de
posi{\c{c}}{\~a}o e intensidade de linhas de
absor{\c{c}}{\~a}o e de emiss{\~a}o (a 296 K) para 39
mol{\'e}culas, incluindo a de {\'a}gua, produto da
combust{\~a}o de hidrocarbonetos. A base de dados HITEMP fornece
os mesmos dados para mol{\'e}culas de H2O, CO2 e CO, ampliando a
base de dados para linhas que apresentam baixa intensidade de
absor{\c{c}}{\~a}o em temperaturas pr{\'o}ximas {\`a}
ambiente, mas consider{\'a}veis em altas temperaturas, presentes
na combust{\~a}o. O programa de simula{\c{c}}{\~a}o foi
desenvolvido em C++ para Windows. O primeiro passo do programa
{\'e} o c{\'a}lculo da intensidade na temperatura da
simula{\c{c}}{\~a}o.A seguir, considera-se que as linhas
t{\^e}m um perfil de Voigt, obtido pela convolu{\c{c}}{\~a}o de
um perfil gaussiano Doppler (alargamento devido {\`a}
temperatura) com um perfil de Lorentz (alargamento por
press{\~a}o). Leva em conta, tamb{\'e}m, o deslocamento por
press{\~a}o para cada uma das linhas. O espectro obtido {\'e} o
resultante da soma da contribui{\c{c}}{\~a}o de todas as linhas
em cada ponto do espectro. O n{\'u}mero ideal de pontos em uma
regi{\~a}o espectral de simula{\c{c}}{\~a}o {\'e} calculado
pelo programa, garantindo uma boa resolu{\c{c}}{\~a}o
gr{\'a}fica. O programa pode ser utilizado para a
simula{\c{c}}{\~a}o de espectros de absor{\c{c}}{\~a}o de alta
resolu{\c{c}}{\~a}o de todas as mol{\'e}culas presentes na base
de dados HITRAN (ou HITEMP). Os resultados das
simula{\c{c}}{\~o}es foram comparados com espectros simulados e
experimentais de artigos da literatura, apresentando boa
concord{\^a}ncia com os mesmos. O programa foi, tamb{\'e}m,
utilizado para simula{\c{c}}{\~a}o de espectros de {\'a}gua nas
condi{\c{c}}{\~o}es experimentais de um estato-reator a
combust{\~a}o supers{\^o}nica (scramjet) que ser{\'a}
constru{\'{\i}}do no IEAv/CTA e utilizar{\'a} a espectroscopia
de absor{\c{c}}{\~a}o da mol{\'e}cula de {\'a}gua como
m{\'e}todo n{\~a}o intrusivo de an{\'a}lise. O m{\'e}todo de
medida de temperatura baseado na espectroscopia de
absor{\c{c}}{\~a}o pode ser usado para obter temperaturas de
chamas de at{\'e} aproximadamente 2500 K, com um desvio
padr{\~a}o de aproximadamente 5%. ABSTRACT: Diode laser
spectroscopy is one of the non-intrusive methods that have been
used successfully in literature to measure gas temperature and
species concentration in flames. To obtain the temperature, the
experimental absorption spectra of chemical species in the flame,
as water for example, are usually compared with theoretical
simulates spectra. In this work, a high-resolution absorption
molecular spectra simulation program was developed from the
databases HITRAN ({"}HIgh-resolution TRANsmission molecular
absorption database{"}) and HITEMP ({"}HIgh-TEMPerature
spectroscopic absorption parameters{"}). The HITRAN database
gives, among others properties, the position and intensity of
absorption and emission lines for 39 molecules at 296 K, including
water, which is one of the main products of the hydrocarbon
combustion. The HITEMP database gives the same parameters for H2O,
CO2 and CO molecules, and also data for lines that have low
intensity at room temperatures but measurable intensities at high
combustion temperatures. The simulation program was developed in
C++ language for Windows. The first step is the calculation of the
line intensities at the simulation temperature. After a Voigt
profile is considered for each line, obtained by the convolution
of a gaussian Doppler profile (temperature broadening) with a
Lorentz profile (pressure broadening). The displacement of the
absorption line position due to pressure effects is also
considered. The obtained spectrum is the sum of each individual
line contribution at each spectrum point. The ideal number of
points in one spectral region of simulation is calculated by the
program to assure good graphic resolution. The program can be used
for the high-resolution absorption spectra simulation of all the
molecules of HITRAN (or HITEMP) database. The simulation results
were compared with simulated and experimental spectra data
obtained in the literature, with good agreement. The program was
also used for simulation of water spectra in the experimental flow
conditions of a scramjet (supersonic combustion ramjet) exhaust
product. The reduced model of this scramjet will be constructed
and tested in IEAv/CTA and will use the non-intrusive diode laser
spectroscopy technique for the water molecule detection and
temperature measurement. The diode laser spectroscopy method can
be used to measure flames temperatures up to 2500 K, with an
accuracy of 5%.",
committee = "Salles, Carlos Eduardo Rolfsen (presidente) and Sbampato, Maria
Esther (orientadora) and Toledo, Siles Paulino de",
copyholder = "SID/SCD",
englishtitle = "Simulation of absorption spectra for determination of temperature
in flames",
language = "pt",
pages = "144",
ibi = "6qtX3pFwXQZGivnJSY/NfSro",
url = "http://urlib.net/ibi/6qtX3pFwXQZGivnJSY/NfSro",
targetfile = "publicacao.pdf",
urlaccessdate = "2024, Apr. 28"
}