Abstract

A means of performing simultaneous, high-speed measurements of temperature and OH lifetime-corrected laser-induced fluorescence (LIF) for tracking unsteady flames has been developed and demonstrated. The system uses the frequency-doubled and frequency-tripled output beams of an 80MHz mode-locked Ti:sapphire laser to achieve ultrashort laser pulses (order 2ps) for Rayleigh-scattering thermometry at 460nm and lifetime-corrected OH LIF at 306.5nm, respectively. Simultaneous, high-speed measurements of temperature and OH number density enable studies of flame chemistry, heat release, and flame extinction in unsteady, strained flames where the local fluorescence-quenching environment is unknown.

© 2007 Optical Society of America

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