Changeset 27aabc1 in sasview

Timestamp:

Jan 4, 2017 4:28:20 AM (8 years ago)

Author:

smk78

Branches:

master, ESS_GUI, ESS_GUI_Docs, ESS_GUI_batch_fitting, ESS_GUI_bumps_abstraction, ESS_GUI_iss1116, ESS_GUI_iss879, ESS_GUI_iss959, ESS_GUI_opencl, ESS_GUI_ordering, ESS_GUI_sync_sascalc, costrafo411, magnetic_scatt, release-4.1.1, release-4.1.2, release-4.2.2, ticket-1009, ticket-1094-headless, ticket-1242-2d-resolution, ticket-1243, ticket-1249, ticket885, unittest-saveload

Children:

ae9b8bf

Parents:

c1681ea

Message:

Changes to smearing help at
/sasview/src/sas/sasgui/perspectives/fitting/media/sm_help.rst

File:

• src/sas/sasgui/perspectives/fitting/media/sm_help.rst (modified) (1 diff)

src/sas/sasgui/perspectives/fitting/media/sm_help.rst

@@ -20 +20 @@
 ==================
 
-Sometimes it will be necessary to correct reduced experimental data for the
-physical effects of the instrumental geometry in use. This process is called
-*desmearing*. However, calculated/simulated data - which by definition will be
-perfect/exact - can be *smeared* to make it more representative of what might
-actually be measured experimentally.
-
-SasView provides the following three smearing algorithms:
+Sometimes the instrumental geometry used to acquire the experimental data has 
+an impact on the clarity of features in the reduced scattering curve. For 
+example, peaks or fringes might be slightly broadened. This is known as 
+*Q resolution smearing*. To compensate for this effect one can either try and 
+remove the resolution contribution - a process called *desmearing* - or add the 
+resolution contribution into a model calculation/simulation (which by definition 
+will be exact) to make it more representative of what has been measured 
+experimentally - a process called *smearing*. SasView will do the latter.
+
+Both smearing and desmearing rely on functions to describe the resolution 
+effect. SasView provides three smearing algorithms:
 
 *  *Slit Smearing*
 *  *Pinhole Smearing*
 *  *2D Smearing*
+
+SasView also has an option to use Q resolution data (estimated at the time of 
+data reduction) supplied in a reduced data file: the *Use dQ data* radio button.
+
+.. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
+
+dQ Smearing
+-----------
+ 
+If this option is checked, SasView will assume that the supplied dQ values 
+represent the standard deviations of Gaussian functions.
 
 .. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ