Investigation of photophysical processes as the basis for quantitative imaging of gas-phase mixing processes with tracer LIF

研究光物理过程作为示踪 LIF 气相混合过程定量成像的基础

• 批准号: 281747438
• 负责人: Professor Dr. Christof Schulz
• 金额: --
• 依托单位: Lehrstuhl für Reaktive Fluide
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/281747438?language=en
• 关键词: Investigation; photophysical; processes; basis; quantitative

The aim of this research project is the improvement of the photophysical understanding of the molecular fluorescence of organic tracer (pairs) as well as the characterization of fluorescence properties in an extended parameter range (temperture, pressure, bath gas composition) and the collection of extended datasets in a web database (TracerSim). Quantitative time- and spatially resolved observation of mixing processes in the gas phase is important for optimizing of, e.g., gas-phase-synthesis or combustion processes. For this purpose, organic molecules are often used as fluorescence tracers in imaging diagnostics (tracer laser-induced fluorescence, tracer-LIF) to determine the quantitative information of interest (e.g., temperature or mixing quality) since fluorescence properties are sensitive to the environmental conditions. The insight generated in this research project can then be used the improvement of diagnostics methods through a better understanding of the underlying photophysics. For this purpose, the second funding period focuses on the following topics:a) In the past years, two or more tracers were used simultaneously for the combined determination of several quantities in mixtures. It has been repeatedly stated that the interaction of the excited molecules is not sufficiently understood to be able to interpret the measured signal intensities without errors. Now, this lack of knowledge will be filled by characterizing and modeling the tracer-tracer interaction under controlled conditions. Furthermore, the results on self-quenching and on the influence of the excitation wavelength gained in the first funding period, which showed to be important for the application of tracer LIF in practical situations will be validated using further practically-relevant tracers.b) The fluorescence properties determined in the first funding period as well as newly measured data for further tracers will be included into the already partially implemented web-based TracerSim database. This database will be further refined and will facilitate the usability of the collected photophysics data and will thus contributes to a better usage of tracer-LIF in the entire research community.c) The new results of this project will be implemented into established photophysical fluorescence quantum yield models to improve the data interpretation capabilities and to extend their applicability to further species, not investigated so far. The models will be integrated into the TracerSim web database for interpolation and extrapolation. Furthermore, an analysis tool for experimental tracer-LIF data will be implemented.

该研究项目的目的是改善有机示踪剂分子荧光（PAIRS）分子荧光的光物理理解，以及在扩展参数范围内（temperture，压力，浴气组成）和Web数据库中扩展数据集收集的荧光特性（Temperture，压力，浴气组成）（TracerSim）。在气相中对混合过程的定量时间和空间分辨的观察对于优化例如气相 - 合成或燃烧过程很重要。为此，在成像诊断（示踪剂激光诱导的荧光，示踪剂-LIF）中，有机分子通常用作荧光示踪剂，以确定感兴趣的定量信息（例如，温度或混合质量），因为荧光性能对环境条件敏感。然后，可以通过更好地理解潜在的光物理学来改善该研究项目中产生的见解。为此，第二个融资期重点介绍以下主题：a）在过去的几年中，同时使用了两个或多个示踪剂，以合并混合物中的几种数量。反复说，激发分子的相互作用不足以理解能够在没有错误的情况下解释所测量的信号强度。现在，缺乏知识将通过在受控条件下表征和建模示踪剂 - 跟踪器相互作用来填补这种知识。此外，在第一个资金期间获得的激发波长的结果以及对在实际情况下应用示踪剂LIF的应用至关重要的结果，将使用进一步的相关示踪剂进行验证。B）b）b）b）b）b）在第一个资助期和新测量数据中确定的荧光，并将其纳入型数据范围。该数据库将进一步完善，并将促进收集的收集到的可用性，因此将有助于在整个研究社区中更好地使用Tracer-LIF。c）该项目的新结果将被实现为已建立的光体荧光量子量子量子产率，以提高数据解释能力并扩展其应用程序，以扩展其应用程序，以扩展其进一步的物种。这些模型将集成到Tracersim Web数据库中以进行插值和外推。此外，将实施用于实验示踪数据的分析工具。