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.

本研究项目的目的是提高对有机示踪剂（对）分子荧光的光物理理解，以及在扩展参数范围（温度、压力、浴气成分）下荧光特性的表征，并在网络数据库（TracerSim）中收集扩展数据集。气相混合过程的定量时间和空间分辨观察对于优化气相合成或燃烧过程等非常重要。为此，有机分子常被用作成像诊断中的荧光示踪剂（示踪激光诱导荧光，示踪lif），以确定感兴趣的定量信息（例如，温度或混合质量），因为荧光特性对环境条件很敏感。在这个研究项目中产生的见解可以通过更好地理解潜在的光物理学来改进诊断方法。为此目的，第二个资助期侧重于以下主题：a)在过去几年中，同时使用两种或两种以上的示踪剂来联合测定混合物中的几种数量。人们一再指出，受激分子之间的相互作用还没有得到充分的理解，因此无法准确地解释所测量的信号强度。现在，这种知识的缺乏将填补表征和建模示踪剂相互作用在受控条件下。此外，在第一个资助期内获得的关于自猝灭和激发波长影响的结果对示踪剂LIF在实际情况中的应用很重要，将使用进一步的实际相关示踪剂进行验证。b)在第一个资助期内确定的荧光特性以及用于进一步示踪剂的新测量数据将被纳入已经部分实施的基于web的TracerSim数据库。该数据库将进一步完善，并将促进所收集的光物理数据的可用性，从而有助于在整个研究界更好地使用示踪- lif。c)本项目的新结果将应用于已建立的光物理荧光量子产率模型，以提高数据解释能力，并将其适用性扩展到迄今尚未研究的其他物种。这些模型将被集成到TracerSim网络数据库中，用于插值和外推。此外，还将实现一个用于实验示踪- lif数据的分析工具。