Title :
Measurements of temperature and OH radical concentration in combustion gases by absorption spectroscopy with a diode laser
Author :
Aizawa, T. ; Kamimoto, T. ; Tamaru, T.
Author_Institution :
Dept. of Mech. Eng., Tokyo Inst. of Technol., Japan
fDate :
Aug. 30 1999-Sept. 3 1999
Abstract :
In this study we demonstrate in-situ quantitative measurements of temperature and OH radical concentration profiles in a post-flame region between premixed twin flames, and thus show the potential for use of diode-laser absorption spectroscopy as a combustion diagnostic tool. The diode laser used in this study is an external cavity diode laser (NewFocus Model 6328) operating near 1.5 /spl mu/m. The laser frequency was modulated and slowly scanned across the absorption features simultaneously by applying a 1 kHz sinusoidal wave and a 0.15 Hz sawtoothed signal onto the voltage input of the piezoelectric transducer attached to the tuning mirror of the laser cavity.
Keywords :
chemical variables measurement; combustion; free radicals; oxygen compounds; spectrochemical analysis; temperature; 1.5 micrometre; OH radical concentration; OH radical concentration profiles; absorption spectroscopy; combustion diagnostic tool; combustion gases; diode laser; diode-laser absorption spectroscopy; external cavity diode laser; in-situ quantitative measurements; laser cavity; piezoelectric transducer; post-flame region; premixed twin flames; temperature; tuning mirror; Absorption; Combustion; Diode lasers; Fires; Frequency modulation; Laser modes; Laser tuning; Spectroscopy; Temperature measurement; Voltage;
Conference_Titel :
Lasers and Electro-Optics, 1999. CLEO/Pacific Rim '99. The Pacific Rim Conference on
Conference_Location :
Seoul, South Korea
Print_ISBN :
0-7803-5661-6
DOI :
10.1109/CLEOPR.1999.811573
