Ticket #2178 (closed: duplicate)

Opened 10 years ago

Last modified 5 years ago

SANS display:In place fitting and calculations

Reported by: Nick Draper Owned by: Steve Williams
Priority: minor Milestone: Iteration 29
Component: Mantid Keywords:
Cc: Blocked By:
Blocking: Tester: Martyn Gigg

Description

Allow in place plotting, fitting with a linear background on a user selected region and then claculations based on the gradient and intercept of the line.

See mockup SANS\Display_with_inplace_fitting

Rg = radius of gyration
Rg,xs = cross-sectional radius of gyration
R = equivalent spherical radius
T = thickness
Pi = 3.141592654...
C = concentration
Phi = volume fraction
Deltarho = difference in neutron scattering length densities (solute - solvent)
M = molecular weight
ML = mass per unit length
NA = Avogadro's number, 6.02214179(30)×10**23 mol−1
D = bulk density
n = Q-dependence
v = excluded volume exponent
zeta = characteristic length
(S/V) = surface area-to-volume ratio


    1: Guinier (spheres) - Ln(I)     v     Q**2    

Gradient = -(Rg**2)/3 = -(R**2)/5

Intercept = M.[(c.(deltarho**2) / (NA.d**2)] = M.[(phi.(deltarho**2) / (NA.d)]

                   
    2: Guinier (rods)    - Ln(IQ)    v     Q**2                        

Gradient = -(Rg,xs**2)/2  (note dividing by 2 this time)

Intercept (Q**2=0) = Ln[(pi.c.(deltarho**2).ML) / (NA.d**2)]   

                
    3: Guinier (sheets)  - Ln(IQ**2) v     Q**2                        

Gradient = -(T**2)/12  (note dividing by 12 this time)

                   
    4: Zimm              - 1/I       v     Q**2           

Gradient = (Rg**2)/3 = (R**2)/5  (no minuses this time!)

Intercept = (1/M).[(NA.d**2) / (c.(deltarho**2)] = (1/M).[(NA.d) / (phi.(deltarho**2)]
            

    5: Kratky            - IQ**2     v        Q       

Plateau Intercept = [(2.c.M.(deltarho**2)) / (NA.(d**2).(Rg**2))] = [(2.phi.M.(deltarho**2)) / (NA.d.(Rg**2))]

                
    6: Debye-Bueche      - 1/Sqrt(I) v     Q**2          

Zeta = (gradient / intercept)**0.5

             
    7: Log-Log           - Ln(I)     v    Ln(Q)  

Gradient = -n = 1/v

                      
    8: Porod             - IQ**4     v        Q      

Plateau Intercept = [(2.pi.c.(deltarho**2)) / d].(S / V)



So some of these can be expressed to terms of c or phi, for example, depending on what the experimenter knows about their sample. The way I would see this working is that there would be a sort of circular calculation where the user can type in one set of cells and the algorithm populates others, if that makes sense. Obviously the user would have to complete all the cells for a particular version of the expression for anything to happen!!!

Change History

comment:1 Changed 10 years ago by Nick Draper

(In [8338]) re #2178

comment:2 Changed 10 years ago by Nick Draper

  • Milestone changed from Iteration 27 to Iteration 28

Bulk move of tickets at the end of iteration 27

comment:3 Changed 9 years ago by Nick Draper

  • Milestone changed from Iteration 28 to Iteration 29

Bulk move of tickets at the end of iteration 28

comment:4 Changed 9 years ago by Nick Draper

  • Owner Sofia Antony deleted

Taken from Sofia Antony's list after she left

comment:5 Changed 9 years ago by Nick Draper

  • Milestone changed from Iteration 29 to Iteration 30

"New" tickets moved at the code freeze of iteration 29

comment:6 Changed 9 years ago by Steve Williams

  • Status changed from new to verify
  • Owner set to Steve Williams
  • Resolution set to duplicate
  • Milestone changed from Iteration 30 to Iteration 29

this is identical to #2197, no?

comment:7 Changed 9 years ago by Martyn Gigg

  • Status changed from verify to verifying
  • Tester set to Martyn Gigg

comment:8 Changed 9 years ago by Martyn Gigg

  • Status changed from verifying to closed

Yes, this looks like a duplicate.

comment:9 Changed 5 years ago by Stuart Campbell

This ticket has been transferred to github issue 3025

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