The second filter is at 4.2 Ојm, it is the wavelength where carbon dioxide (CO2) emits. Using this, it is possible to isolate the shape of the injected liquid fuel from the hot gases in the combustion chamber. One filter is at 3.9 Ојm, a wavelength where liquid phase has high reflectance. Moreover, two band-pass filters have been used.

In particular, it has been possible to detect the fuel vapor and the burned gas motion in the combustion chamber for a longer period with respect to visible range. IR imaging has allowed obtaining more information with respect to the visible imaging. Infrared images have been detected in the spectrum from 1.5 Ојm to 5 Ојm. The time evolution of the injected fuel, of the flames, and of the burned gases has been analyzed. 2D infrared (IR) chemiluminescence measurements have been performed in an optical Common Rail diesel engine in order to investigate the different processes that regulate the pollutant emission formation. Recently, thermography has proved to be a powerful tool to deepen the knowledge about the chemical and physical processes that take place in automotive engine.

However, further development of the automotive engine is necessary to meet future challenges. Big efforts have been made to meet the strict regulations they are subjected to. The exhaust gases emitted from automobiles are one of the major sources of pollution in urban centers.

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