The spectrograph

Spectra in this compilation are obtained with a do-it-yourself Czerny-Turner spectrograph, attached to a Celestron C8 Schmidt-Cassegrain telescope. Collimator mirror and camera mirror are also made by the author.

Further components:

• Corpus: Birch multiplex plywood, adapters for Cameras and Telescope: aluminium
• Grating: Thorlabs 300 grooves/mm, blazed at 500 nm
  Grating angle can be adjusted with a micrometer screw, driven by a stepper motor
• Slit: Ovio Instruments Jetons
  used slit: 30 microns
• calibration lamp: Relco SC480
  Calibration lamp can be switched in before slit by a stepper motor
• Stepper motor control unit: Arduino Uno and Software "Grating Control" (developer: Christoph Pircher)
• Guidingcamera: Alccd 5LIIc, adapted to an 35mm Photo-Objektive
• Science Camera: see specific spectrum, adapted to an non-rotating helical focuser

FWHM of Emissionlines of Calibration lamp: 3.8 Angström

Dispersion: ca. 0,81 Angström per pixel with ATIK 414ex mono

Spectrum of darkimage (4 captures added, 3 lines binned), normalized to maximum intensity of a spectrum, to illustrate the thermal noise of the ATIK 414ex mono.