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66 lines
3.0 KiB
Matlab
66 lines
3.0 KiB
Matlab
% Call function without arguments for instructions on how to use it
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% Filename: $RCSfile: pixel_to_q.m,v $
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%
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% $Revision: 1.1 $ $Date: 2008/06/10 17:05:14 $
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% $Author: $
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% $Tag: $
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%
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% Description:
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% calculated momentum transfer q in inverse Angstroem from pixel numbers
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% relative to the beam center
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%
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% Dependencies:
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% none
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%
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% history:
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%
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% June 9th 2008: 1st documented version
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%*-----------------------------------------------------------------------*
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%| |
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%| Except where otherwise noted, this work is licensed under a |
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%| Creative Commons Attribution-NonCommercial-ShareAlike 4.0 |
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%| International (CC BY-NC-SA 4.0) license. |
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%| |
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%| Copyright (c) 2017 by Paul Scherrer Institute (http://www.psi.ch) |
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%| |
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%| Author: CXS group, PSI |
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%*-----------------------------------------------------------------------*
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% You may use this code with the following provisions:
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%
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% If the code is fully or partially redistributed, or rewritten in another
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% computing language this notice should be included in the redistribution.
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%
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% If this code, or subfunctions or parts of it, is used for research in a
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% publication or if it is fully or partially rewritten for another
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% computing language the authors and institution should be acknowledged
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% in written form in the publication: “Data processing was carried out
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% using the “cSAXS matlab package” developed by the CXS group,
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% Paul Scherrer Institut, Switzerland.”
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% Variations on the latter text can be incorporated upon discussion with
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% the CXS group if needed to more specifically reflect the use of the package
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% for the published work.
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%
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% A publication that focuses on describing features, or parameters, that
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% are already existing in the code should be first discussed with the
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% authors.
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%
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% This code and subroutines are part of a continuous development, they
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% are provided “as they are” without guarantees or liability on part
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% of PSI or the authors. It is the user responsibility to ensure its
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% proper use and the correctness of the results.
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function [ q_A ] = pixel_to_q( pixel, pixel_size_mm, det_dist_mm, E_keV )
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if (nargin ~= 4)
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fprintf('Usage:\n');
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fprintf('[ q_A ] = %s( pixel, pixel_size_mm, det_dist_mm, E_keV );\n',...
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mfilename);
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error('Wrong number of parameters, 4 expected, %d found',nargin);
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end
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lambda_A = 12.39852 / E_keV;
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q_A = 4*pi * sin( atan(pixel*pixel_size_mm/det_dist_mm) /2) / lambda_A;
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