1. For these two reasons, we have adopted an alternate strategy for calibrating the temperJture images shown in Figure 10. We assumed that somewhere in the flowfield the temperature exceeded the maximum temperature that the particular transition could measure (eg. 2200 K for ?1(38.5) line and 1700 K for R,(35.5) line.) Then we measured the average intensity of an especially bright part of each raw image. We assumed that the gas corresponding to this bright spot was at the maximum temperature and thus calibrated to this point. While this method has some drawbacks, it produced sensible temperature maps for evety image. Figure 11 shows vertical (perpendicular to the incoming flow) temperature profiles for the average and two selected single shot temperature maps.
2. In the individual images, one sees small pockets cf gas at temperatures exceeding 1600 K. These hot spots are usually located near the flat plate, or near the shear layer, but rarely in the middle of the separated flow region.
3. Some aspects of shock-wave boundary layer interaction at hypersonic speeds