WFC3 Fringing Removal software
Fringing is the effect of internal reflections within a detector causing constructive and destructive interference. The fringing is highly sensitive to the thickness of the silicon, which therefore affect the shapes and amplitudes of the fringe pattern. CCDs with thinned silicon substrates, which improve detection efficiency, commonly have more severe fringing at longer wavelengths. The UVIS data is affected by fringing at wavelengths beyond ~650 nm. Affected filters include: F953N, FQ889N, FQ906N, FQ924N, FQ937N, F656N, F658N, FQ672N, F673N, FQ674N, FQ727N, and FQ750N.
We currently provide corrections for full frame F953N, F656N, F658N, and F673N. Our correction reduces fringing by ~85%. Version 2.0 of this software will include sub arrays and quad-filters. The analysis and testing of this code are discussed in the ISR links
Below is the downloadable package for fringe removal. It is a python 3 code which is run from the command line. The code is interactive and requires user inputs. The diagram shows the inputs as the code runs.
Click here to download software (135 MB tar.gz file)
ISR 2010-04: Amplitude of fringing in WFC3/UVIS narrowband red filters