Quantitative characterization of gaseous premixed flames based on thermographic images

Abstract To understand the behaviour and potential hazards of gaseous premixed flames, particularly in industrial settings, it is crucial to accurately characterize them. This study presents a novel method for the quantitative analysis of flame geometry using infrared (IR) thermographic imaging to improve image analysis and data acquisition. A FLUKE RSE300 thermographic camera was employed to capture high‐resolution images of premixed LP gas flames under controlled conditions. The acquired IR images were processed using grayscale conversion, Otsu's binarization, and edge detection techniques to extract key geometrical parameters, including flame length, width, surface area, and volume. A scale factor was introduced to convert pixel measurements into real‐world dimensions, ensuring precise quantification. Statistical analysis of multiple trials demonstrated the robustness of the method, as the frequency in the result data appears to be a normal distribution with a modal value around the centre of the histogram, with uncertainties primarily attributed to manual scale factor selection, showing an uncertainty of 7.3% and 8.7% for the volume and superficial area results, respectively.