Abstract

The determination of flame temperatures by infra-red radiation has been reinvestigated based on the experiments of Schmidt, Henning, and Tingwaldt. Criteria for such a brightness thermometer are described, and means for minimizing some of the errors are discussed. It is concluded that (a) infrared emission for the CO2 band at 4.4 microns can be used at least for non-luminous flames which contain CO2 as one of the products of combustion, (b) temperatures are obtained that are consistent to within less than 5 percent, and (c) observed temperatures tend to be lower than theoretical temperatures.

© 1949 Optical Society of America

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