Flying Laptop
Project Management, Professor of Satellite Technology

Prof. Dr.-Ing. Sabine Klinkner

Secretary
Prof. Klinkner

Annegret Möller


Institut für Raumfahrtsysteme
Pfaffenwaldring 29
70569 Stuttgart


 

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Optics Laboratory

The Optics Laboratory is located in the integration room but is separated from the rest of the room by black curtains. In addition, its walls, ceiling and furniture are painted black to suppress stray light. The measuring equipment enables the team to determine the optical properties of the camera systems of Flying Laptop and to calibrate them.

The calibration of cameras can be classified into three categories:

  • radiometric calibration,
  • spectral calibration,
  • geometric calibration.

Radiometric calibration is used to measure the sensitivity of every pixel of the camera sensor. This makes it possible to determine the physical value of a signal by using the digital value measured by the camera. Therefore, the team uses a light source with known radiance and spectral distribution, a so called integrating sphere, with a 500 mm diameter.

 

Integration sphere

The intention of spectral calibration is to investigate the sensor’s reaction to light at different wavelengths. This is important because CCD-Sensors as well as the optics have wavelength-dependent properties. To achieve this, the measurement setup consists of a Quartz Tungsten Halogen lamp as light source, a monochromator to select a narrow band of wavelengths from the light source spectrum, and a lens setup to focus the light.

Measurement setup for spectral calibration

The primary purpose of geometric calibration is to determine the geometric distortions of the camera, so that the effect can be removed during post processing.