Echelle Spectrograph


Echellogram, beta Geminorum


Echellogram, Thorium Argon comparison lamp. Blue region (UV) down, red region (IR) up. In spectral orders, wavelength grows from right to left.


Cross section of the echellogram (flat field). Blue region (UV) on the left, red region (IR) on the right.

Basic characteristics of the CCD chip

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  • CCD chip: Versarray 2048B, EEV 2048x2048, EEV 42-10-1-368, pixel 13.5 micrometers
  • Gain: 2
  • Read noise: 10
  • Operational temperature: -110°C
  • Cooling: liquid nitrogen
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    • Identification of Thorium Argon lines in OES echellogram