Theses
Available Topics
The following tasks provide a current cross section through our research activities. Experience shows that it is possible to adapt the given or a new task in a personal conversation to the individual interests and constraints.
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Spatially resolved temperature measurement in fluids using confocal fluorescence microscopyThe increasing demand for technical parts with micro dimensions increasingly requires the use of manufacturing techniques such as laser chemical manufacturing (LCM), whose non-contact material removal is based on a localized chemical reaction with an electrolyte... » more
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Laser optical geometry measurement on wind power rotor bladesOver long distances (100-300 m), a laser-based distance measuring system is to be used to measure the rotor blade geometry of wind turbines during operation. » more
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Making the invisible visible: Automated localisation of flow transitions by means of image processing methodsThe flow behaviour of rotor blades of wind turbines is influenced dynamically by ambient conditions and the condition of the rotor blades. The transition from laminar to turbulent flow can, for example, occur more prematurely than the planned flow transition due... » more
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Measurement of dynamic flow conditions on wind turbines in operationThe aerodynamic flow behaviour of the rotor blades is crucial for the efficient operation of wind turbines. Depending on the geometric distribution of different flow conditions in the boundary layer near the surface, rotor blades exhibit a resulting lift and flow... » more
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Investigation of dynamic deformations on wind turbinesWind turbines must withstand enormous loads and deform under dynamically changing flow conditions. In order to investigate the dynamic behaviour, the deformations of the tower and rotor blades of a wind turbine during operation are to be measured over long... » more
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Simulation of turbulent flow separation on wind turbinesTurbulent flow separation on rotor blades of wind turbines induces a sudden decrease of torque and an increase in drag. Besides aerodynamic performance loss, occur structural loads and increasing acoustic emissions. To be able to investigate the physical flow... » more
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In-process deformation measurements in metalworking manufacturing processesDeformation measurements based on speckle photography have been used for many years in special applications of production technology. In particular, the development of high-speed cameras with 4k resolution and the availability of ultra-short pulse lasers offer a... » more
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Uncertainty analysis of refractive index distributions on tomographic PIV measurementsParticle Image Velocimetry is a standard optical measure-ment technique for the determination of flow velocity fields. Cameras are used to measure the particle movements as-sociated with the flow. The particle movement is used to re-construct the velocity field.... » more
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Measurement of the refractive index fields of flamesThe investigation of reactive flow processes such as flame flows is a current research area in process engi-neering and energy research. To characterize the dy-namics of these processes, optical flow measurement techniques are used in which the refractive index... » more
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Thermographic flow visualization with defined angular movement of the camera system for optimal image distributionThermographic images can be used to visualize the near-surface boundary layer flow of rotor blades of wind turbines during operation (Figure 1). In order to achieve a high geometric resolution for the images from distances of up to 300 m, the surface of the rotor... » more
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Reducing measurement uncertainty in speckle photography measurementsSpeckle photography is an optical measuring method for high-resolution determination of deformations. "Speckles" are dots of light that are created when rough surfaces such as paper, wallpaper or metals are illuminated with a laser » more
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Flow visualisation of a two-phase free jetAn established measurement technique for flows is the Particle Image Velocimetry (PIV), where the flow behaviour can be de-rived from a spatial shift of light scattering particles between two consecutive images » more
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IR thermographic flow visualisation on wind turbinesTurbulent flow separation on rotor blades of wind turbines induces a sudden decrease of torque and an increase in drag. Besides aerodynamic performance loss, occur structural loads and increasing acoustic emissions. » more
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At the limits of measurement technology - Measurement of the geometry of large gears -Large gears (d > 1 m) represent a special challenge for measurement technology. The tolerances for large gears start at just under one hundredth of a millimeter, so that compliance with the golden rule of measurement technology (1/10 of the measurement uncertainty... » more
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Design and characterization of a test stand for flow measurementA current research question is the flow behavior of cooling lubricant during the supply in grinding processes. The particle image velocimetry (PIV) method is to be used. For this purpose, particles are fed to the coolant flow whose move-ments are measured by... » more
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Thermographic detection and analysis of damage to rotor blade leading edges of wind turbinesThe condition of the leading edge of the rotor blade significantly influences the aerodynamic properties of the rotor blade and thus the performance of the wind turbine. Damage caused primarily by erosion limits the lifetime of wind turbines and leads to high... » more
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Concept for a calibration strategy of an optical sensor system for measuring the geometry of gearsDue to high dynamic loads, the required service life of gearboxes in wind turbines is often not achieved. The requirements for measuring the actual geometric proper-ties of large gears are increasing in order to prevent de-fects. » more
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Realization of a self-calibrating setup for in-process deformation measurement based on speckle photographyMeasuring systems based on speckle photography can detect shifts down to the nanometer range, in particular with the aid of complex optical systems (for example microscope objectives). » more
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Expansion of renewable energies: Where to put the Energy?The planning of powerlines and storage systems requires a precise knowledge of power transports in the network at different boundary conditions. The steady growth of renewables and their fluctuating power input will stress the transfer and distribution networks. » more
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Simulation of a lateral scanning white-light interferometerRising demands for the surface quality of consumer and industrial products require fast and accurate metrology. White-light interferometry (WLI) is an established measurement method for topography on optically smooth surfaces. » more
Completed Theses you will find » here.