The nature of the fiber noise with the FOCES spectrograph. Nature, modeling and a way to achieve S/N > 400

Details The nature of the fiber noise with the FOCES spectrograph. Nature, modeling and a way to achieve S/N > 400 The nature of the fiber noise with the FOCES spectrograph. Nature, modeling and a way to achieve S/N > 400

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...412..897g&link_type=abstract

Astronomy and Astrophysics, v.412, p.897-902 (2003)

Astronomy and Astrophysics

Astrophysics

8

Instrumentation: Spectrographs, Techniques: Spectroscopic, Telescopes

Scientific paper

The non-white noise noticed using the fiber-fed FSHAPE OCES spectrograph is recognized as the result of vignetting to an uneven distribution of monochromatic light in the spectrograph beam behind the fiber exit. This phenomenon - that can be assigned to every fiber-coupled spectrograph with vignetting of the light path behind the fiber - is qualitatively and quantitatively described and modeled. The S/N ratio that seemed to be limited to ~200 when surrounding the object exposure by two flatfield exposures is shown to reach the theoretical limit (defined by the linear range of the CCD-detector) of S/N ~ 500. This is achieved by using multiple flatfield exposures in combination with a fiber vibration device allowing non-harmonic movement of the fiber during exposure time.

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