Abstract
A method is developed for the shock tube measurement of nitric oxide and atomic oxygen from the Chemiluminescent radiation which is proportional to the product of their concentrations. The method is dependent on the assumptions that the nitric oxide formation is governed by the Zeldovich mechanism, and is not close to chemical equilibrium, and offers the advantage of determining both [NO] and [O] from a single measurement. Time-resolved profiles of these species in mixtures with hydrogen or methane as fuel show good agreement with chemical kinetics calculations, although some difficulty was experienced with background radiation. The background radiation, which could not be eliminated, limits the minimum measurable mole fraction product to X^OXO= 6.391 exp (-82037//?^D for mixtures diluted with argon. Determination of [CO], which required an additional measurement, was also made in the methane mixtures. However, the measured trends do not agree with those calculated, although correct levels are obtained.
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