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Up: Alternative Flat-Fielding Strategies
Observations of a uniformly illuminated screen within the telescope
dome may be substituted for the twilight sky. As with the sky, though,
the a sequence of exposures would be taken as the intensity of the screen
illumination is gradually increased or decreased. The flat-field image
would be constructed as in 3.3.
- Acquisition of the flat-field data is greatly simplified.
The color temperature of the illumination source can be tailored
to match typical astronomical sources. Again, this procedure uses the
existing pipeline design with single, fixed flat, so there would be
minimal impact in design and processing speed.
- Historically, dome flats have been found to be
ineffectual for near infrared imaging. However, the variable intensity
measurements have not been tested to our knowledge. Requires upkeep of
Thu Feb 16 15:47:28 PST 1995