From d3776bb6077baa0d8e2a38a8dd84fcedc841b51c Mon Sep 17 00:00:00 2001
From: Eugeniy Mikhailov <evgmik@gmail.com>
Date: Tue, 11 Dec 2012 15:23:02 -0500
Subject: added new functions to extract delay times

---
 xmds2/realistic_Rb_and_fields/field_delay.m       | 30 +++++++++++++++++++++++
 xmds2/realistic_Rb_and_fields/find_pulse_center.m | 11 +++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 xmds2/realistic_Rb_and_fields/field_delay.m
 create mode 100644 xmds2/realistic_Rb_and_fields/find_pulse_center.m

(limited to 'xmds2/realistic_Rb_and_fields')

diff --git a/xmds2/realistic_Rb_and_fields/field_delay.m b/xmds2/realistic_Rb_and_fields/field_delay.m
new file mode 100644
index 0000000..6f2de6e
--- /dev/null
+++ b/xmds2/realistic_Rb_and_fields/field_delay.m
@@ -0,0 +1,30 @@
+realistic_Rb_and_fields;
+
+dt=mean(diff(t_1));
+Ip2_b = Ip2_out_1(:,1);
+Ip2_a = Ip2_out_1(:,end);
+
+[c, lags] = xcov(Ip2_a, Ip2_b);
+[m, i] = max(c);
+
+delay_time = dt*lags(i);
+
+% delay in nS
+str= sprintf('delay_time_with_xcov= %f nS', 1e9*delay_time);
+disp(str);
+
+
+[pcenter_b, perr_b] = find_pulse_center(t_1', Ip2_b);
+[pcenter_a, perr_a] = find_pulse_center(t_1', Ip2_a);
+
+delay_time = pcenter_a - pcenter_b;
+delay_time_err = sqrt( perr_a^2 + perr_b^2);
+
+
+str= sprintf('delay_time_with_fit= %f nS', 1e9*delay_time);
+disp(str);
+
+str= sprintf('delay_time_error_with_fit= %f nS', 1e9*delay_time_err);
+disp(str);
+
+
diff --git a/xmds2/realistic_Rb_and_fields/find_pulse_center.m b/xmds2/realistic_Rb_and_fields/find_pulse_center.m
new file mode 100644
index 0000000..11b3395
--- /dev/null
+++ b/xmds2/realistic_Rb_and_fields/find_pulse_center.m
@@ -0,0 +1,11 @@
+function [pc, pc_err] = find_pulse_center(x,y)
+
+f=fittype(@(A,x0,width, x) A.*exp(-((x-x0)/width).^2) );
+pin=[1e4, 0, .4e-6];  % A, x0, width
+
+[fitobject,gof] = fit (x, y, f, 'StartPoint', pin);
+ci = confint(fitobject);
+
+coefi=2; %x0
+pc      = (ci(2,coefi) + ci(1,coefi))/2;
+pc_err  = (ci(2,coefi) - ci(1,coefi))/2;
-- 
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