Thermographic flow visualization with defined angular movement of the camera system for optimal image distribution
Thermographic 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 blade is captured section by section with a thermographic camera using a telephoto lens. The resulting individual images are then combined to create an overall image for evaluation of the aerodynamic conditions.
Until now, the offset between the individual thermographic images was relatively undefined and carried out manually by swivelling the tripod head. This results in an irregular step size and overlapping of the individual images. This procedure makes the subsequent assembly of the individual images considerably more difficult. In order to allow section-by-section images of the rotor blade surface with a uniform offset, it is necessary to change the pan angle of the camera for the individual images in uniform steps. This makes it considerably easier to assemble the individual shots and allows for repeatable regularity of the individual shots (Fig. 2).
The topic of this thesis aims at the extension of the existing measuring system by a controllable swivel movement during the measurement. For this task, the tripod head has to be extended by an adjustable rotation unit, with which the pan position of the camera can be pre-defined and the current angular position can be returned to the user as feedback. Thus, a pan movement with defined angle steps between the individual shots is realized. For the subsequent assembly of the individual images, the acquired information about the angular positions of the camera can be linked to the individual images. The task includes design as well as software technical parts and offers the possibility to participate in current research contents.
- Students of the study field Production Engineering, Systems Engineering or Engineering and Manageme
- interest in camera technology
- No shyness at programming tasks
- Ability for autodidactic familiarization with new topics
- Good technical understanding
- Ability to work independently and in a team
- Experience with MATLAB and Python is helpful, but not a basic requirement