2-DIMENSIONAL TEMPERATURE DETERMINATION IN THE EXHAUST REGION OF A LAMINAR FLAT-FLAME BURNER WITH LINEAR RAMAN-SCATTERING

For planar temperature measurements in combusting flows, the well-esta blished laser Raman technique has been further developed to provide tw o-dimensional local resolution. After excitation with a frequency-doub led Nd:PAG laser, the anti-Stokes and the Stokes Raman signals of the vibrational Q branch of molecular N-2 were detected at 473.3 and 607.3 nm, respectively. From the ratio of the two images, two-dimensional t emperature distributions have been obtained by application of an analy tical function, which was determined from theoretically calculated Ram an spectra. Time-averaged measurements have been performed in the exha ust region of an atmospheric-pressure laminar CH4/air flat-flame burne r for different equivalence ratios. Toe accuracy and precision of the results are discussed in combination with the prospects ibr time-resol ved single-pulse measurements. (C) 1997 Optical Society of America.