TEMPERATURE IMAGING WITH SINGLE-WAVELENGTH AND DUAL-WAVELENGTH ACETONE PLANAR LASER-INDUCED FLUORESCENCE

Two sensitive techniques for temperature imaging by use of acetone pla nar laser-induced fluorescence, applicable at temperatures up to 1000 K, are introduced and demonstrated. Photophysics data on the wavelengt h-dependent temperature variation of acetone fluorescence permit the i mplementation of a single-wavelength technique in environments with co nstant pressure and constant acetone mole fraction, and a dual-wavelen gth method can be applied in flows with mixing and (or) chemical react ion. Preliminary imaging results are presented for acetone-air flow ov er a heated cylinder (single-wavelength strategy) and for a heated lam inar jet (dual-wavelength strategy). (C) 1997 Optical Society of Ameri ca.