The choice of technique developed for this study is based on Laser Induced Fluorescence (LIF). The light source consists of a pulsed Nd:YAG laser using the fourth harmonic wavelength of 266nm. The fuel used in the study is iso-Octane with 3-pentanone added as a tracer due to its similar physical properties. Optical fibres are used in order to achieve optical access. One fibre is used for excitation and six fibres are used to collect the emitted light. A photomultiplier tube is used to detect and analyse the emitted light. The developed method is tested and calibrated to tracer concentration, liquid temperature, PMT gain and change in excitation light energy. A final curve used for obtaining the film thickness is created.
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