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    Coude' echelle grating spectrograph
    Update time: 2009-09-15
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    (second class prize of science & technology progress award of CAS in 1999,third class prize of national science & technology progress award in 1998) 
     The Coude' echelle grating spectrograph is an important instrument for high disperse spectra observation attached to the telescope with large aperture。In China,it is terminal device of 2.16M telescope。The instrument adopted many cutting-edge optical technology listed below:
    1):collimator and long focal length camera adopting off-axis paraboloidal mirror
    2):short focal length camera adopting fold Schmid system
    3):median focal length camera adopting off-axis fold Schmid system
      A lot of difficulties in material selection and fabrication method were solved and big risk was bear for large size of lateral disperse prism at red band and blue band。Result of run the instrument indicates that it can reach advanced level of its kind in the world on aspect of observation efficiency。

    Nanjing Institute of Astronomical Optics & Technology ,National Astronomical Observatories ,CAS