Asynchronous Optical Sampling for Laser-Based Combustion Diagnostics in High-Pressure Flames
Final rept. 15 Dec 1988-14 Dec 1991
PURDUE UNIV LAFAYETTE IN SCHOOL OF MECHANICAL ENGINEERING
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This is the final report on the development of a new laser-based combustion diagnostic for the quantitative measurement of both major and minor species in high-pressure flames. The technique, Asynchronous Optical Sampling ASOPS, is a state-of-the-art improvement in picosecond pumpprobe spectroscopy. A method is presented for vastly improving the output of the synchronously mode-locked dye laser systems. The beat frequency is increased to 155.7 kHz. Subnanosecond excited-state lifetimes for Na are obtained with only 128 averages, for the first time allowing data to be obtained within the time scale of turbulence. The first quantitative evaluation of the ASOPS technique in a flame environment is presented. Pumpprobe spectroscopy, Laser diagnostics, Combustion, Stimulated emission.
- Combustion and Ignition