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: http://xmm.vilspa.esa.es/calibration/documentation/CALHB/node381.html
Дата изменения: Tue Sep 20 19:45:19 2011 Дата индексирования: Mon Apr 11 02:59:07 2016 Кодировка: Поисковые слова: comet |
This description is a copy of in [3]. The following definitions are used:
The fraction of scattered light for small/large angle scatter is
with a correction factor of the LSF probability density for
large angle scattering of
where &
are stored in CCF LineSpreadFunc, and
is defined by
The power spectral densities are defined with respect to , with
and finally the density functions for small and large angle scatter
are
The intensity of the LSF for one bin in that has a range from
to
is then given by
where the total fraction of non-scattered light is given by
. The function
that is implemented in the CAL does not include the last term (the
-function), as is only the unscattered light and its
contribution is taken care of by the calling task (rgsrmfgen).
In order to obtain the LSF, this needs to be convolved with the PSF of
the mirror, which acts as a perturbation of . This is
not performed by this function.