scholarly journals Identification of Rocket Motor Characteristics from Infrared Emission Spectra

10.5772/37317 ◽  
2012 ◽  
Author(s):  
N. Hamp ◽  
J.H. Knoetze ◽  
C. Aldrich ◽  
C. Marais
Keyword(s):  
Emission Spectra ◽  
Infrared Emission ◽  
Rocket Motor

The Use of Ratio-Recording Interferometry for the Measurement of Infrared Emission Spectra: Applications to Oxide Films on Copper Surfaces

1975 ◽  
Vol 29 (6) ◽  
pp. 496-500 ◽  
Author(s):  
D. Kember ◽  
N. Sheppard
Keyword(s):  
Emission Spectra ◽  
Black Body ◽  
Infrared Emission ◽  
Thin Layers ◽  
Oxide Surface ◽  
Surface Layers ◽  
Selective Reflection ◽  
Copper Surfaces ◽  
Emission And Absorption Spectra ◽  
Direct Correspondence

Infrared emission spectra from metal samples with oxide surface layers are shown to be very advantageously studied using the spectrum-ratioing facility of a recording infrared interferometer. The emission from a given sample is ratioed against that from a black-body emitter at the same temperature so as to give emittance as a function of wavenumber directly. This method has very useful application to irregularly shaped metal emitters. In the absence of selective reflection there is a direct correspondence between emission and absorption spectra for thin layers of an emitting substance. However, the presence of selective reflection leads to reduced emission and to considerable differences in the appearance of “absorption” and emission spectra in regions of strong absorption. Emission spectra obtained from copper plates heated, above 150°C, for different periods in air are shown clearly to indicate the presence of cuprous, Cu(I), and cupric, Cu(II), oxides in the surface layer.

Infrared emission spectra of BeH2 and BeD2

2003 ◽  
Vol 118 (8) ◽  
pp. 3622-3627 ◽  
Author(s):  
A. Shayesteh ◽  
K. Tereszchuk ◽  
P. F. Bernath ◽  
R. Colin
Keyword(s):  
Emission Spectra ◽  
Infrared Emission

Temperature Gradients Through EHD Films and Molecular Alignment Evidenced By Infrared Spectroscopy

1981 ◽  
Vol 103 (1) ◽  
pp. 65-73 ◽  
Author(s):  
V. W. King ◽  
J. L. Lauer
Keyword(s):  
Absorption Spectrum ◽  
Emission Spectra ◽  
Infrared Emission ◽  
Molecular Alignment ◽  
Temperature Gradients ◽  
Spectral Change ◽  
Continuum Source ◽  
Polyphenyl Ether ◽  
Elementary Analysis ◽  
Gap Width

Partial and complete emission band reversals have been observed in the infrared emission spectra from portions of operating sliding contacts. An elementary analysis has been carried out to show that partial reversals are due to temperature gradients in the fluid film—the film acts both as a radiation-emitter and absorber, and that total reversals—an emission spectrum appears as an absorption spectrum—are likely to be due to a continuum source, such as hot solid asperities. The total energy radiated under the latter conditions exceeds that under the others. A decrease in gap width with increased load was accompanied by a dramatic spectral change in the case of 5P4E polyphenyl ether, which is indicative of molecular alignment.

scholarly journals Modeling the Anharmonic Infrared Emission Spectra of PAHs: Application to the Pyrene Cation

2020 ◽  
pp. 95-102
Author(s):  
M. Basire ◽  
P. Parneix ◽  
T. Pino ◽  
Ph. Bréchignac ◽  
F. Calvo
Keyword(s):  
Emission Spectra ◽  
Infrared Emission

Gas Turbine Exhaust Emissions Monitoring Using Nonintrusive Infrared Spectroscopy

1998 ◽  
Vol 120 (3) ◽  
pp. 514-518 ◽  
Author(s):  
M. Hilton ◽  
A. H. Lettington ◽  
C. W. Wilson
Keyword(s):  
Gas Turbine ◽  
Molecular Species ◽  
Tomographic Reconstruction ◽  
Emission Spectra ◽  
Exhaust Emissions ◽  
Infrared Emission ◽  
High Spectral Resolution ◽  
Rotational Line ◽  
Spectroscopic Techniques ◽  
Reconstruction Procedure

Infrared (IR) spectra of the exhaust emissions from a static gas turbine engine have been studied using Fourier Transform (FT) spectroscopic techniques. Passive detection of the infrared emission from remote (range ∼ 3 m) hot exhaust gases was obtained nonintrusively using a high spectral resolution (0.25 cm−1) FTIR spectrometer. Remote gas temperatures were determined from their emission spectra using the total radiant flux method or by analysis of rotational line structure. The HITRAN database of atmospheric species was used to model the emission from gas mixtures at the relevant temperatures. The spatial distribution of molecular species across a section transverse to the exhaust plume ∼10 cm downstream of the jet pipe nozzle was studied using a tomographic reconstruction procedure. Spectra of the infrared emission from the plume were taken along a number of transverse lines of sight from the centerline of the engine outwards. A mathematical matrix inversion technique was applied to reconstruct the molecular concentrations of CO and CO2 in concentric regions about the centerline. Quantitative measurement of the molecular species concentrations determined nonintrusively were compared with results from conventional extractive sampling techniques.

scholarly journals Infrared Emission Spectra of CaF2-CaO-SiO2 Melt.

2000 ◽  
Vol 40 (8) ◽  
pp. 739-743 ◽  
Author(s):  
Shigeru Ueda ◽  
Hirotaka Koyo ◽  
Takashi Ikeda ◽  
Yoshiharu Kariya ◽  
Masafumi Maeda
Keyword(s):  
Emission Spectra ◽  
Infrared Emission

A catalog of laser-stimulated infrared emission spectra

1971 ◽  
Vol 56 (2) ◽  
pp. 161-174 ◽  
Author(s):  
D.M. Hailey ◽  
H.M. Barnes ◽  
C. Woodward ◽  
J.W. Robinson
Keyword(s):  
Emission Spectra ◽  
Infrared Emission

Infrared Emission Spectra of Indium Phosphide at Elevated Temperatures

1997 ◽  
Vol 502 ◽  
Author(s):  
H. Rogne ◽  
P. J. Timans ◽  
H. Ahmed
Keyword(s):  
Elevated Temperatures ◽  
Semiconductor Device ◽  
Thermal Emission ◽  
Emission Spectra ◽  
Infrared Emission ◽  
Device Fabrication ◽  
Optical Measurements ◽  
Optical Data ◽  
Monitoring And Control ◽  
Process Monitoring And Control

ABSTRACTProcess monitoring and control during semiconductor device fabrication frequently relies on good knowledge of the optical properties of the substrate wafer and the surface coatings. However, these optical data are often unavailable, and as a consequence errors arise in pyrometric temperature measurements, as well as in thermal modelling of heating cycles. In this study, isothermal electron beam heating has been combined with in situ optical measurements to record thermal emission spectra of undoped InP specimens from 347 to 478°C, at wavelengths between I and 9 μm. The absorption coefficient was deduced from the emission spectra and reveals information about the temperature dependence of the infrared absorption mechanisms in InP.

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