DETERMINATION OF SPATIAL TEMPERATURE DISTRIBUTIONS IN A LAMINAR PREMIXED ETHYLENE AIR FLAME BY LASER-INDUCED ATOMIC FLUORESCENCE

A quick and simple detection system for spatially resolved temperature measurements in flames based on laser-induced thermally assisted atom ic line fluorescence of seeded rubidium atoms is described. The fluore scence light from two atomic states is dispersed and simultaneously re corded by a CCD camera. The fluorescence ratio distributions lead dire ctly to absolute temperature distributions. The practical use, the spa tial and temperature resolution and error limits of the method are dis cussed and compared with other procedures for temperature measurements .