In order to study of application of tunable diode laser absorption spectroscopy (TDLAS) in the diagnosis of combustion heat transfer that is based on TDLAS and computed tomography (CT). A two-dimensional temperature distribution reconstruction system for surface combustion heat transfer field of flat flame furnace is established. Firstly, TDLAS technology and CT algorithm are studied. By selecting 7203.89 cm-1 and 7435.62 cm-1 absorption spectrum of water vapor, a two-dimensional reconstruction

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... system of temperature measurement based on tunable diode laser absorption (2D) spectroscopy (TDLAT) is established. The system measurement results are verified. Secondly, the accuracy of the two-dimensional reconstruction image obtained by the system is analyzed. Finally, 2D reconstruction results are compared with the thermocouple test's results. The temperature measurement system established has been verified to be relatively stable with a small fluctuation range and a heating trend consistent with the set value. The analysis of reconstruction image accuracy shows that the reconstruction accuracy can be improved by increasing the number of laser paths and reducing the influence of noise. The reconstruction results of TDLAT have high accuracy, and the celebrity and timeliness of measurement have significant advantages in the online measurement of combustion diagnosis. The temperature measurement system of flat flame furnace based on TDLAT technology realizes the high-resolution and highprecision measurement of the combustion flame non-uniform flow field, which has important theoretical guidance, significance, and engineering experimental value for promoting the application of TDLAS technology in combustion flow field diagnosis.