%  Ultrafast Fibre Laser Experiment, University of Toronto.
%  Written by:  Gajanan Kuganesan       Date:  Spring 2004.
%  Programmed for MATLAB 6.1, (available on Faraday via Nortel Labs).
%  
%  The following code imports the oscilloscope data for the Autocorrelator
%  Trigger, Speaker Signal, and Measured Interferometric Autocorrelation
%  
%  File:  ref1 contains Autocorrelator Trigger (channel 1) and Speaker (channel 2)
%  FIle:  ref2 contains Inteferometric Autocorrelation Signal.
%
%  Imported Data:  Data can be imported from LABVIEW software (oscilloscope)
%  available on the UFL computer.  Data from LABVIEW should be saved as an 
%  Microsoft Excel file (*.xls), the setup data (first few lines) should be
%  recorded and then elminated to be compatiable with the below code.  
%  That is the data imported should contain only 2 column in an *.xls file;
%  the first column contains the oscilloscope voltage data and the second
%  column contains the oscilloscope time data.

%*****************************************************************************

clear;              %clear previous data
rawdata = importdata('c:\ultra1b\ref1.xls');    %Imports data as formatted above
rawdata2 = importdata('c:\ultra1b\ref2.xls');   %Imports data as formatted above


ch1div = 0.5;  %channel 1 volts/division, in milliVolts
ch1pos = 0.5;  %channel 1 position w.r.t. rawdata zero
ch2div = 2;    %channel 2 volts/division, in milliVolts
ch2pos = -4;   %channel 2 position w.r.t. rawdata zero
ch3div = 50;   %channel 3 volts/division, in milliVolts
ch3pos = -20;  %channel 3 position w.r.t. rawdata zero

% Arrange raw data into Voltage vectors
for i = 1:length(rawdata)
   voltage1(i) = rawdata(i,1);
   voltage2(i) = rawdata(i,2);
   voltage3(i) = rawdata2(i,1);
   time(i) = rawdata(i,3);
end;

% Set up Vectors pased on Settings
voltage1 = voltage1*ch1div - ch1pos;
voltage2 = voltage2*ch2div - ch2pos;
voltage3 = voltage3*ch3div - ch3pos;

%*****************************************************************************

%  The following plots display the Trigger, Speaker and Autocorrelation Signals 
subplot(3,1,1); plot(time,voltage2);
title('Function Generator Sync Signal: Oscilliscope');  ylabel('Voltage (V)'); 
subplot(3,1,2); plot(time,voltage1);
title('Sinusoidal Speaker Signal: Oscilliscope');
ylabel('Voltage (V)');
subplot(3,1,3); plot(time,voltage3);
title('Interferometric Autocorrelation Signal: Oscilliscope');
ylabel('Voltage (mV)');  xlabel('Time [s]');

%text(-10,60, num2str(max(voltage1)));