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Purpose and Description
The IRSFRINGE tool is an IDL-based GUI package that allows observers to
interactively remove fringes from IRS spectra. Fringes that originate from
the detector subtrates are observed in the IRS Short-High (SH) and
Long-High (LH) modules. In the Long-Low (LL) module, another fringe
component is seen as a result of the pre-launch change in one of the LL
filters. The fringes in the Short-Low (SL) module are not spectrally
resolved. Usually the fringes are already largely removed in the pipeline
processing when the flat field is applied. However, this correction is
not perfect and remaining fringes can be removed with IRSFRINGE from data
in each module.
IRSFRINGE is available as a stand-alone package and is also part of the
Spectroscopic Modeling, Analysis and Reduction Tool
(SMART). Two defringing methods can be used. The first method makes
use of a robust sine function fitting method. This method uses a first
order approximation to the full optical interference model by assuming
the the physical and optical parameters are constant within one order
range. The second method (under development) makes use of the
flat-field and tries to minimize the fringe residuals by matching the
flat-field with the data before applying it.
IRSFRINGE operates in two modes: automatic and manual. In the manual mode,
tolerance or a number of fringes to be removed can be set.
Downloading and Installing the Software
This software has been developed and tested
under IDL 5.6....we make no guarantees for other IDL versions.
Follow these instructions for Downloading
and Installing the Software.
Running IRSFRINGE
A brief introduction on how to run IRSFRINGE.
User's Guides
Supporting Documentation
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