Measurement of transient gas flow parameters by diode laser absorption spectroscopy
- Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow (Russian Federation)
- A M Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)
- Reserch Center of High Energy Densities Physics, Joint Institute for High Temperatures, Russian Academy of Sciences (Russian Federation)
An absorption spectrometer based on diode lasers is developed for measuring two-dimension maps of temperature and water vapour concentration distributions in the combustion zones of two mixing supersonic flows of fuel and oxidiser in the single run regime. The method of measuring parameters of hot combustion zones is based on detection of transient spectra of water vapour absorption. The design of the spectrometer considerably reduces the influence of water vapour absorption along the path of a sensing laser beam outside the burning chamber. The optical scheme is developed, capable of matching measurement results in different runs of mixture burning. A new algorithm is suggested for obtaining information about the mixture temperature by constructing the correlation functions of the experimental spectrum with those simulated from databases. A two-dimensional map of temperature distribution in a test chamber is obtained for the first time under the conditions of plasma-induced combusion of the ethylene – air mixture. (laser applications and other topics in quantum electronics)
- OSTI ID:
- 22551279
- Journal Information:
- Quantum Electronics (Woodbury, N.Y.), Vol. 45, Issue 4; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7818
- Country of Publication:
- United States
- Language:
- English
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