Laboratory for thermography

Boundary layer visualization of
running wind turbine rotor blades

The temperature distribution on the surface of a rotor blade can be detected by thermographic cameras. BIMAQ investigates thermographic mea­sure­ments of rotor blades on wind turbines in opera­t­ion. Measurements are taken in co­ope­ration with the Deutsche WindGuard Engineer­ing GmbH in Bremerhaven. Meaningful results can be achiev­ed from a distance between 100 and 500 m.

Technical data

ImageIR thermographic imaging system

  • High speed system
  • Detector format: 640 x 512 Infrared Pixel
  • Spectral range: 2 - 5 μm
  • Focal length incl. telephoto lens: 200 mm


  • Determination of the laminar/turbulent tran­sition location
  • Detection of early laminar-turbulent transit­ion due to leading edge conta­mina­tion, eros­ion, manufacturing irregularities or the eff­ects of leading edge protection
  • Inspection of vortex generators, zig-zag tapes and other flow control device

Boundary layer visualization of
wind turbine airfoils

In order to investigate the boundary layer flow phenomena on airfoils, thermographic mea­surement approaches are developed and applied. The research focus are new image evaluation techniques based on the flow dynamics. The flow experiments with two different IR imaging systems are performed at the Deutsche WindGuard Aeroacoustic Wind Tunnel in Bremerhaven, where laminar air flows at speeds of up to 360 km/h and chord-Reynolds numbers of up to 6 million can be generated. Aerodynamic as well as aero­acoustic studies are conducted.

Technical data

VarioCam hr

  • Detector format: 640 x 480 Infrared Pixel
  • Spectral range: 7,5 - 14 μm
  • Focal lengths: 12,5 mm and 30 mm


  • Detector format: 640 x 512 Infrared Pixel
  • Spectral range: 2 - 5 μm
  • Focal lengths: 12 mm, 25 mm, 100 mm and 200 mm


  • Determination of the laminar turbulent transition location
  • Checking functionality of vortex generators and zig-zag tape
  • Comparison to simulation data

Contact Details

Christoph Dollinger
E-Mail: Enable JavaScript to view protected content.
Phone:+49 (0)421 218 646 28

»  Description as PDF