DESIS Design

The spectrometer is a hyperspectral instrument for the spectral range of 400 to 1000 nm (VIS-NIR).  DLR-OS has a long heritage in the field of (imaging) spectrometer in space (MKS on IK21, MOS on IRS, MeRTIS on Bepi Colombo) and is involved in some recent developments (EnMAP, Sentinel 4). From this tradition and the associated experience has now emerged DESIS.

DESIS: Sophisticated optical design for MUSES auf der ISS:

  • Compact structure with a minimal number of optical components (lens, slit, primary mirror, convex grating and CMOS array detector)
  • Has a corrected, telecentric lens objective (robust, easy adjustment, low mass) with flat field and minimal aberrations
  • Spherical primary mirror, which combines collimating and imaging optics
  • Convex grating as dispersion element, the appropriate optimization of the spectrometer at high spatial and spectral resolution up to a flat focal plane
  • The specially designed groove profile of the grating leads to complete suppression of the second order spectrum and minimum polarization sensitivity
  • Two input mirrors allows to modify the view angle
DESIS/EXPLOSION DRAWING
DESIS/EXPLOSION DRAWING

DESIS spectrometer performance

DESIS: an Offner- Spectrometer

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