Optics and Spectroscopy for Fluid Characterization

Dear Colleagues,

All over the world, there is a huge and ever-increasing interest in the development and application of optical and spectroscopic techniques to characterize fluids in engineering and science. Methods in this category have substantially advanced our understanding of fluids (gases, liquids, and multiphase). This is particularly true for the last 50 years, as laser-based techniques became gold standards in the analytical sciences and engineering. A key feature of such light-based methods is that they are usually non-intrusive and hence they do not notably alter the systems under investigation. The list of parameters and characteristics that can be measured by optical and spectroscopic techniques in a fluid is long. It includes macroscopic properties such as temperature, chemical composition, thermophysical quantities, and flow velocity, but also molecular information, e.g., about isomerism and intermolecular interactions can be obtained. The list of techniques is long as well. It includes absorption based methods like FTIR, UV/vis, and fluorescence spectroscopy, scattering based methods like Raman, Rayleigh, PIV, LDA/PDA, static and dynamic light scattering, nonlinear optical methods like CARS, laser-induced gratings, degenerate four-wave-mixing, and many others.

The upcoming Special Issue of Applied Sciences will focus on recent developments in optical and spectroscopic techniques for fluid characterization. It will show the breadth of the field including advances in hardware and instrumentation, methodology, and practical implementation. We would like to invite you to submit or recommend original research papers for the "Optics and Spectroscopy for Fluid Characterization" Special Issue.

Prof. Dr.-Ing. Johannes Kiefer
Guest Editor

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