Cavity Enhanced Absorption Spectroscopy in a flame: detection of OH radicals and water molecules in flames
A compact diode laser operating around 1.5 micrometer is used to measure CEA
spectra of hot water molecules and OH radicals in radiative environments under
atmospheric conditions. Spectra of air are measured in an oven at temperatures
ranging from 300 K to 1500 K. These spectra contain rovibrational lines from
water and OH. The water spectra are compared to simulations from the HITRAN and
HITEMP databases. Furthermore, spectra are recorded in the flame of a flat
methane/air burner and in an oxyacetylene flame produced by a welding torch. The
results show that CEA spectroscopy provides a sensitive method for the rapid
monitoring of species in radiative environments.(reference)
Near-infrared cavity enhanced absorption spectroscopy of hot water
and OH in an oven and in
flames.