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High temperature 10.4-microm absorption in CO(2)-He-N(2) mixtures
Applied Optics
|March 12, 2010
Summary
This study measured the absorption coefficient of carbon dioxide (CO2)-helium (He)-nitrogen (N2) gas mixtures. Results show good agreement between calculated and measured values, enabling accurate absorption estimations.
Area of Science:
- Physical Chemistry
- Spectroscopy
- Gas Phase Dynamics
Background:
- Accurate absorption coefficient data is crucial for various applications, including laser technology and atmospheric modeling.
- Previous studies have provided limited data for specific gas mixtures and temperature ranges.
Purpose of the Study:
- To experimentally determine the absorption coefficient of carbon dioxide (CO2)-helium (He)-nitrogen (N2) gas mixtures.
- To develop and validate methods for estimating absorption coefficients in similar gas mixtures.
Main Methods:
- Absorption coefficient measurements were conducted using a carbon dioxide (CO2) laser at four wavelengths.
- Experiments covered a temperature range of 295-650 K.
- Measured values were compared against calculated values for fifteen different gas mixtures.
Main Results:
- Experimental and calculated absorption coefficients showed agreement within 10% for the tested gas mixtures.
- An interpolation scheme was developed to accurately estimate absorption coefficients for unmeasured gas mixtures.
- A simpler, less accurate interpolation method based solely on CO2 fraction was also presented.
Conclusions:
- The study provides reliable absorption coefficient data for CO2-He-N2 mixtures.
- The developed interpolation schemes offer practical tools for predicting absorption in related gas compositions.
- Findings contribute to improved understanding and modeling of radiative transfer in gas mixtures.
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