Compare old and new. Add simulation with LUT

dcm_lookup_tables.org

@@ -88,8 +88,8 @@ In this section, we suppose that we are in the frame of one fast jack (all trans
 Let's say with make a Bragg angle scan between 10deg and 60deg during 100s.
 #+begin_src matlab
 Fs = 10e3; % Sample Frequency [Hz]
-t = 0:1/Fs:100; % Time vector [s]
+t = 0:1/Fs:10; % Time vector [s]
-theta = linspace(10, 60, length(t)); % Bragg Angle [deg]
+theta = linspace(10, 40, length(t)); % Bragg Angle [deg]
 #+end_src
 
 The IcePAP steps are following the theoretical formula:
@@ -190,28 +190,54 @@ exportFig('figs/generated_lut_icepap.pdf', 'width', 'wide', 'height', 'normal');
 #+RESULTS:
 [[file:figs/generated_lut_icepap.png]]
 
-We can see that the LUT is *not* the motion error (Figure [[fig:lut_correct_and_motion_error]]).
+The current LUT implementation is the following:
 #+begin_src matlab
 motion_error_lut = zeros(size(lut_range));
 for i = 1:length(lut_range)
     % Get points indices where the icepap step is close to the wanted one
     close_points = icepap_steps > 1e-6*lut_range(i) - 500e-9 & icepap_steps < 1e-6*lut_range(i) + 500e-9;
     % Get the corresponding motion error
-    motion_error_lut(i) = lut_range(i) - 1e6*mean(measured_motion(close_points)); % [um]
+    motion_error_lut(i) = lut_range(i) + (lut_range(i) - round(1e6*mean(measured_motion(close_points)))); % [um]
 end
 #+end_src
 
+Let's compare the two Lookup Table in Figure [[fig:lut_comparison_two_methods]].
+#+begin_src matlab :exports none
+%% Comparison of the two Generated Lookup Table
+figure;
+hold on;
+plot(lut_range, lut, ...
+    'DisplayName', 'New LUT');
+plot(lut_range, motion_error_lut, ...
+    'DisplayName', 'Old LUT');
+hold off;
+xlabel('IcePAP input step [um]'); ylabel('Lookup Table output [um]');
+legend('location', 'southeast');
+#+end_src
+
+#+begin_src matlab :tangle no :exports results :results file replace
+exportFig('figs/lut_comparison_two_methods.pdf', 'width', 'wide', 'height', 'normal');
+#+end_src
+
+#+name: fig:lut_comparison_two_methods
+#+caption: Comparison of the two lookup tables
+#+RESULTS:
+[[file:figs/lut_comparison_two_methods.png]]
+
+If we plot the "corrected steps" for all steps for both methods, we clearly see the difference (Figure [[fig:lut_correct_and_motion_error]]).
+
 #+begin_src matlab :exports none
 %% Corrected motion and motion error at each step position
 figure;
 hold on;
 plot(lut_range, lut-lut_range, ...
-    'DisplayName', 'Lookup Table Correction');
+    'DisplayName', 'New LUT');
-plot(lut_range, motion_error_lut, ...
+plot(lut_range, motion_error_lut-lut_range, ...
-    'DisplayName', 'Motion Error');
+    'DisplayName', 'Old LUT');
 hold off;
 xlabel('IcePAP Steps [um]'); ylabel('Corrected motion [um]');
 ylim([-110, 110])
+legend('location', 'southeast');
 #+end_src
 
 #+begin_src matlab :tangle no :exports results :results file replace
@@ -223,6 +249,53 @@ exportFig('figs/lut_correct_and_motion_error.pdf', 'width', 'wide', 'height', 'n
 #+RESULTS:
 [[file:figs/lut_correct_and_motion_error.png]]
 
+Let's now implement both LUT to see which implementation is correct.
+#+begin_src matlab :exports none
+icepap_steps_output_new = lut(round(1e6*icepap_steps)-lut_range(1)+1);
+i = round(1e6*icepap_steps)-motion_error_lut(1)+1;
+i(i>length(motion_error_lut)) = length(motion_error_lut);
+icepap_steps_output_old = motion_error_lut(i);
+#+end_src
+
+#+begin_src matlab
+motion_new = zeros(size(icepap_steps_output_new));
+motion_old = zeros(size(icepap_steps_output_old));
+
+for i = 1:length(icepap_steps_output_new)
+    [~, i_step] = min(abs(icepap_steps_output_new(i) - 1e6*icepap_steps));
+    motion_new(i) = measured_motion(i_step);
+
+    [~, i_step] = min(abs(icepap_steps_output_old(i) - 1e6*icepap_steps));
+    motion_old(i) = measured_motion(i_step);
+end
+#+end_src
+
+#+begin_src matlab :exports none
+%% Measured Motion and Idealized Motion
+% Use only middle motion where the LUT is working
+i = round(0.1*length(icepap_steps)):round(0.9*length(icepap_steps));
+figure;
+hold on;
+plot(icepap_steps(i), motion_new(i), ...
+    'DisplayName', 'Motion (new LUT)');
+plot(icepap_steps(i), motion_old(i), ...
+    'DisplayName', 'Motion (old LUT)');
+plot(icepap_steps(i), perfect_motion(i), 'k--', ...
+    'DisplayName', 'Ideal Motion');
+hold off;
+xlabel('IcePAP Steps [m]'); ylabel('Measured Motion [m]');
+legend('location', 'southeast');
+#+end_src
+
+#+begin_src matlab :tangle no :exports results :results file replace
+exportFig('figs/compare_old_new_lut_motion.pdf', 'width', 'wide', 'height', 'normal');
+#+end_src
+
+#+name: fig:compare_old_new_lut_motion
+#+caption: Comparison of the obtained motion with new and old LUT
+#+RESULTS:
+[[file:figs/compare_old_new_lut_motion.png]]
+
 * Attocube Calibration                                              :noexport: