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Planar Laser-induced fluorescence (PLIF) is a spectroscopic method used for studying structure of molecules, detection of selective species and flow visualization and measurements. It is used for the investigation of the reacting and non-reacting gas and liquid flows. In PLIF, the flow is illuminated by a laser light sheet whose wavelength is tuned to excite a particular transition. A fraction of the ground state molecules absorbs the incident light and is excited to a higher electronic energy state. The excited species will after some time, usually in the order of few nanoseconds to microseconds, de-excite and emit light at a wavelength larger than the excitation wavelength. This light, fluorescence, is measured.