Dr.-Ing. Fabian Hagen
M.Sc. Sebastian Knapp

Students of chemical engineering/process engineering, mechanical engineering, physics, or chemistry interested in experimental work. Knowledge of optical diagnostics and/or data analysis may help you get started, but is not required.

Location: CS

Motivation:

Knowledge of the surface temperature of cooled and/or heated components is of major importance for many transient phenomena. Surface temperature has a major impact on phase changes, for example by triggering condensation of the gas phase crossing a cooled surface. Moreover, the surface temperature determines whether condensed droplets evaporate on the component surfaces, or any chemical reactions occur, such as polymerization, which are facilitated by increasing surface temperature. These findings are particularly important in process engineering applications, as they form the basis for optimizing processes and avoiding potential damage. Precise, non-intrusive and time-resolved surface temperature measurements are therefore essential to ensure efficient and reliable plant operation.

Task:

In this master's thesis, which is a joint work with the Institute of Internal Combustion Engines at KIT, thermographic phosphors are to be used for the non-intrusive and time-resolved measurement of surface component temperatures on the gas phase side. The principle of phosphor thermometry is based on phosphorescence, which in turn is due to temperature-dependent internal energy transfer processes. By irradiating phosphor-doped surfaces with high-energy, ultraviolet laser light, phosphorescence can be specifically excited. The decay time of the resulting radiation process is temperature-dependent and can therefore be used to measure the temperature.

The thesis is to be divided into four work packages. First, literature research on the measuring principle and the state of the art is to be carried out. Then a generic experiment for phosphorus thermometry must be designed and set up, which enables calibration curves to be recorded and parameter variations to be carried out. The experimental work concludes with the non-intrusive and time-resolved determination of the component surface temperature in an engine application. The fourth part of the thesis comprises the development of data processing tools and the analysis of the measurement data.

Responsible:

Prof. Dr.-Ing. Dimosthenis Trimis