A heliostat is a mirror that reflects the sunlight always on the same spot regardless of the sun's
position. Whole fields of such mirrors are used for solar thermal power plants.
The sunlight heats a medium that is used to generate electrical energy.
Modern heliostats such as the Stellio
heliostat shown here have a
diameter of about 10m. A profound understanding of the behavior of the mirrors
under wind loads is needed in order to optimize performance. As part of a research project at DLR
one of the major German research institutions, in Jülich, Germany, Linearis3D has developed a
photogrammetric video system that is capable of detecting dynamic deformations of heliostats in all weather
and lighting conditions.
To solve the measuring task, Linearis3D created a dynamic photogrammetric measuring system with the
- 4 cameras with 5 megapixel resolution
- Measuring frequencies up to 60 Hz
- Data volume up to 1.2 GB / s
- Workstation with 128GB RAM
- over 1000 retroreflective measurement points
- IP 67 protected cameras and lighting
- Dynamic orientation of the cameras
- Multi-Camera Calibration
- Comprehensive analysis and filtering functions in the software
- Expandable with additional cameras
The video photogrammetry system makes precise 3D deformation measurments of a very high number of
measuring points possible while requiring relatively little time and cost. As a result the system
contributes significantly to the success of the research project.
We would like to thank DLR for the excellent cooperation.