Opened 3 years ago

#1019 new defect

Add an auto background estimate to the Invariant Perspective

Reported by: butler Owned by:
Priority: major Milestone: SasView 5.0.0
Component: SasView Keywords:
Cc: Work Package: SasView GUI Enhancements


As per ticket #958, this is the second part of that ticket which is now moved to the new ESS GUI project or release 5.0.

Basically the Invariant, like the Pr, requires that the data go to zero at infinite Q (i.e. is properly background subtracted). For neutrons this is actually impossible due to solvent incoherent which is either ignored and made part of the fit (as a flat background value) or is attempted to be subtracted but is then either overestimated or underestimated somewhat (either of which can cause problems).

Thus in practice one always needs to allow a non zero flat background as part of the fitting procedure. The invariant currently allows this as a user input. Pr allows for the program to "fit" this rather than have to guess. A similar functionality is desired for the Invariant perspective.

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