Combinations of optical interference band-pass filter and photomultiplier are often used for detecting OH* and CH* chemiluminescences in examining the correlation between chemiluminescent intensities and the combustion quantities, such as equivalence ratio and temperature. Since we consider that the influence of continuous background emission on chemiluminescent emission intensities should not be ignored, we propose a technique for removing those influences on OH* and CH* chemiluminescent emission intensities measured by the combination of optical band-pass filters and photomultipliers. Moreover, the correlation between the actual chemiluminescent emission intensities without the influence of continuous background emission and the physical quantities has been investigated in the present study. By separating chemiluminescent emission intensities of OH* and CH* from continuous background emission intensities, it becomes possible to measure equivalence ratio using chemiluminescent emission intensities at any positions of a flame. This technique holds wider applicability than the conventional methods.
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