Measurement of Three-Dimensional Combustion Distribution using CT-TDLAS

In order to use energy resources efficiently, accurate measurement of combustion gases is necessary. Measurement of the temperature and concentration of a target gas is possible with tunable laser absorption spectroscopy (TDLAS) technique. The TDLAS technique can be used to control and monitor combustion in industrial processes. The 3-dimensional temperature distribution of methane-air premixed flame was measured using the constructed computed tomography tunable diode laser absorption spectroscopy (CT-TDLAS) system. The 3-dimensional temperature distributions are measured by five layers of the 2-dimensional cell. The simultaneous multiplicative algebraic reconstruction technique (SMART) algorithm was adopted for reconstructing the absorption coefficients on the meshes. As a result of comparing the temperatures for all the layers using thermocouples and the CT-TDLAS technique, it was possible to accurately measure the average relative error of temperature as 19.7 K.