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ptycho/diagnosis/utils/DOF_calculator.m

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+function [dof,pixel_size] = DOF_calculator(energy, det_pixel, det_N, distance, alpha)
+%Calculate theoreical depth of focus for X-ray ptychography
+
+% Inputs:  
+%     **energy     beam energy (keV)
+%     **det_pixel  detector pixel size (m) 
+%     **det_N      # of pixels in the detector
+%     **distance   # sample to detector distance (m)
+%     **alpha      additional scaling coefficient
+% *returns*: 
+%     ++dof    depth of focus for ptychography
+
+lambda = 1.23984193e-9/energy; % wavelength (m)
+pixel_size = lambda*distance/(det_pixel)/det_N; %pixel size in ptycho reconstruction (m)
+dof = alpha * pixel_size^2/lambda;
+end
+