Laser-based spectroscopic system for in-situ diagnosis of particle/gas reactive flows

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The requested "Laser-based spectroscopic system for in-situ diagnosis of particle/gas reactive flows will enable time-resolved, in-situ, physico-chemical characterization of particle-laden flows as well as of the surrounding gas in high-temperature complex reactive systems. Thanks to ist great versatility, several spectroscopic techniques will be applied, depending on the targeted properties of interest and on the reactive system. Laser-induced breakdown spectroscopy, planar laser-induced incandescence, and planar laser-induced fluorescence constitute the core diagnostics pursued with this system by the main applicant. The characterization of particles/aerosols in flows, including chemical composition and physical properties (e.g., particle size, concentration, and morphology), is highly relevant for many industrial production and emission processes. Optical diagnostics offer clear advantages for this highly challenging characterization thanks to the possibility of analyzing simultaneously and in a non-intrusive manner several physico-chemical properties with an excellent spatio-temporal resolution and high sensitivity and selectivity. This is needed to obtain new insights in (I) the processes involved in the formation of particles/aerosols from the precursor gas, (II) the interactions between the particles/aerosols with the surroundings, and (III) the implementation of online control approaches, to be able to develop novel design and optimization methods. In the current and planned research projects of the applicants, the main utilization of the requested system is centered on the in-situ physico-chemical characterization of particles/aerosols either formed in the gas phase or entrained directly in the gas-phase, principally in the framework of the thermochemical conversion of biomass and plastics for the production of materials and chemicals. Such experimental approach, combining the different spectroscopic techniques for the on-line, in-situ characterization of particles/aerosols as well as the surrounding gas in the above introduced field is first of ist kind to the knowledge of the applicants. The requested system includes a laser configured to work with high-energy pulses in the IR, visible, and (deep) UV regions, a detector able to provide, with high spectral resolution and sensitivity, the requested information from the reactive systems, the software and computer able to both operate the system and process the data, and the accessories necessary for laser and signal guidance.