Infrared Techniques for Temperature Measurement in Plasmajets

1962 ◽  
Vol 84 (2) ◽  
pp. 164-168 ◽  
Author(s):  
Richard H. Tourin
Keyword(s):  
Temperature Measurement ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Low Temperatures ◽  
Visible Region ◽  
Infrared Emission ◽  
Temperature Gradients ◽  
Monochromatic Radiation ◽  
Emission And Absorption Spectra ◽  
Infrared Techniques

The application of monochromatic radiation pyrometry to measurement of plasma temperatures was investigated. Infrared emission and absorption spectra of nitrogen, argon, and helium plasmajets, with various admixtures, were measured. Strong infrared emission was observed in various lines and bands in the plasma spectra, extending from the visible region to 7.0 μ. The observed infrared absorption was generally low. Temperatures measured ranged from below 2000 deg K for a N2 plasmajet heavily seeded with CO2, to 13,000 deg K for pure Ar. Temperature gradients in a plasmajet were inferred from observations made through various regions of the jet.

scholarly journals On the emission and absorption spectra of mercury

1921 ◽  
Vol 100 (703) ◽  
pp. 200-217 ◽  
Keyword(s):  
Absorption Spectra ◽  
Direct Contact ◽  
Wave Length ◽  
Monochromatic Radiation ◽  
Mercury Vapour ◽  
Low Density ◽  
Special Study ◽  
Emission And Absorption Spectra

In two papers by Raymond C. Dearle accounts are given of investigations in which a special study was made of the monochromatic radiation λ = 1·014 μ . This radiation Paschen found to be by far the strongest in the emission arc spectrum of mercury, and Dearle’s observations corroborated this view. Dearle found moreover, that when light of this wave-length was passed through non-luminous mercury vapour, even when of low density, a definite and well-marked absorption was obtained. He also found the same effect when the mercury vapour traversed was in direct contact with the mercury vapour in which the arc was established from which the original radiation was obtained, and was also directly illuminated by the radiation from this arc.

Infrared Emission Spectroscopy Applied to the Oxidation of Molybdenum

1978 ◽  
Vol 32 (3) ◽  
pp. 310-316 ◽  
Author(s):  
L. M. Gratton ◽  
S. Paglia ◽  
F. Scattaglia ◽  
M. Cavallini
Keyword(s):  
Sample Preparation ◽  
Absorption Spectra ◽  
Emission Spectroscopy ◽  
Emission Spectra ◽  
Infrared Emission ◽  
Molybdenum Oxides ◽  
Spectroscopy Technique ◽  
Infrared Emission Spectroscopy ◽  
Emission And Absorption Spectra ◽  
Absorption Technique

The present work points out the utility of infrared emission spectroscopy as applied to the study of the oxidation of metal surfaces. It is shown that good results can be achieved even with standard dispersion spectrophotometers. The work shows emission spectra obtained at a temperature of only 133°C from samples of about 380 A thickness and 2 cm2 area. The molybdenum oxides are particularly useful to test the capability of the infrared emission spectroscopy technique. The study of the behavior of the emission bands and the differences between the emission and absorption spectra show that this technique cannot only be an alternative to absorption spectroscopy, but also can give different data from those which can be achieved by the absorption technique. Spectra are recorded directly on the oxidizing sample. The increase in intensity and the change in the shape of the bands are monitored while the oxidation is performed. It is noted that with infrared emission spectroscopy, sample preparation is greatly simplified.

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.

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