Measurement of selective species concentration using spectroscopic holography

Eynas Amer; Per Gren; Kerstin Ramser; Mikael Sjödahl

doi:10.1117/12.2319386

7 September 2018 Measurement of selective species concentration using spectroscopic holography

Eynas Amer, Per Gren, Kerstin Ramser, Mikael Sjödahl

Proceedings Volume 10834, Speckle 2018: VII International Conference on Speckle Metrology; 108340P (2018) https://doi.org/10.1117/12.2319386
Event: SPECKLE 2018: VII International Conference on Speckle Metrology, 2018, Janów Podlaski, Poland

Abstract

Spectroscopic holography refers to techniques in which the detected hologram contains information about specific species in the medium under study. In general, at least two lasers are required with wavelengths chosen carefully to fit the interaction process utilized. In this process, energy from the shorter wavelength laser beam is transferred to the longer wavelength coherently through the process of stimulated emission. Two interaction mechanisms are considered; Stimulated Laser Induced Fluorescence (LIF) and Stimulated Raman Scattering (SRS), which both are species specific with the ability of coherent interaction. In this paper, the fundamental properties of spectroscopic holography is presented and demonstrated with a few idealized experiments. These validation experiments are performed in a gas chamber in which different gases may be blended and the gas pressure changed between 1-12 bars. In addition, two examples of applications are presented. In the first set of experiments, LIF holography is used to image light absorption and laser heating in a dye simultaneously. The second set of experiments is performed in a ow of methane gas. It is demonstrated that the combination of holographic phase measurements and SRS gain images may be used for calibration. This calibration may further be used to measure absolute concentration in a burning flame.

Citation Download Citation

Eynas Amer, Per Gren, Kerstin Ramser, and Mikael Sjödahl "Measurement of selective species concentration using spectroscopic holography", Proc. SPIE 10834, Speckle 2018: VII International Conference on Speckle Metrology, 108340P (7 September 2018); https://doi.org/10.1117/12.2319386

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