In situ Gas Temperature Measurements by UV-Absorption Spectroscopy
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The absorption spectrum of the NO A2Σ+ ← X2Πγ-system can be used for in situ evaluation of gas temperature. Experiments were performed with a newly developed atmospheric-pressure high-temperature flow gas cell at highly uniform and stable gas temperatures over a 0.533 m path in the range from 23 °C to 1,500 °C. The gas temperature was evaluated (1) from the analysis of the structure of selected NO high-resolution γ-absorption bands and (2) from the analysis of vibrational distribution in the NO γ-absorption system in the (211–238) nm spectral range. The accuracy of both methods is discussed. Validation of the classical Lambert–Beer law has been demonstrated at NO concentrations up to 500 ppm and gas temperatures up to 1,500 °C over an optical absorption path length of 0.533 m.
KeywordsHigh gas temperature Nitric oxide Lambert–Beer law UV absorption spectroscopy Vibrational relaxation
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