Raman investigations are carried out to evaluate potential real-world application fields using an in-house developed portable shifted excitation Raman difference spectroscopy (SERDS) system at 785 nm. Pilot Raman measurements are performed in the presence of background light, laser-induced fluorescence, within optically turbid media and of weak Raman scatterers i.e., ambient air gases. In the presence of background light and laser-induce fluorescence, SERDS separates Raman signals of soil substances with a 15-fold improvement of the signal-to-background noise. Ingredients of bovine milk as the optically turbid test sample are clearly detected and identified. Ambient air gases are investigated even under daylight conditions. The results show the potential of the portable SERDS sensor systems for real-world applications,
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