Spectrally resolved measurements of absorption of broadband UV light-emitting diodes by combustion radicals

摘要

A novel absorption diagnostic is proposed which probes combustion radicals in flames using broadband UV excitation produced by light-emitting diodes and measures the spectrum of the light transmitted through the absorption path. Fitting of the measured spectra using a model of the absorption allows values for temperature, species concentration, and potentially other properties to be inferred. This work provides an outline of how these types of measurements may be made in experiments and how the results can be analyzed and interpreted. The diagnostic is demonstrated by inferred measurements of temperature and hydroxyl radical concentration in a laminar methane-air flame.