LINEWISE RAMAN-STOKES ANTI-STOKES TEMPERATURE-MEASUREMENTS IN FLAMES USING AN UNINTENSIFIED CHARGE-COUPLED-DEVICE

One-dimensional, spatially resolved (linewise), temporally averaged St okes/anti-Stokes temperature measurements with 200 mu m spatial resolu tion and 6% precision uncertainty are demonstrated in an opposed-jet-d iffusion flame of air vs N-2-diluted H-2 using the Raman-Stokes/anti-S tokes technique. The Stokes/anti-Stokes temperature profile is compare d to temperature measurements obtained using all major species' Q-bran ches and differences between the two sets of results are discussed. In addition, single-pulse, linewise measurements with 710 mu m spatial r esolution and 19% precision uncertainty are also demonstrated. To the authors' knowledge this is the first report of linewise Stokes/anti-St okes temperature measurements in flames. Simultaneous measurements of the N-2 Stokes and anti-Stokes vibrational Q-branches are obtained by using an unintensified Charge-Coupled Device (CCD) that is gated by a ferro-electric liquid crystal light valve and/or a low duty cycle opti cal chopper to suppress detected flame luminosity. This detection syst em provides increased detection efficiency, dynamic range, and imaged spectral range over an intensified CCD, allowing spatially resolved St okes and anti-Stokes signals to be imaged onto one detector.