113 lines
3.1 KiB
Matlab
113 lines
3.1 KiB
Matlab
%% Clear Workspace and Close figures
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clear; close all; clc;
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%% Intialize Laplace variable
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s = zpk('s');
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addpath('./mat/');
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% Cedrat Technology
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% Load Data
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piezo1 = load('cedrat_la75b_med_1_stack.mat', 't', 'V_in', 'V_out');
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piezo2 = load('cedrat_la75b_med_2_stack.mat', 't', 'V_in', 'V_out');
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piezo3 = load('cedrat_la75b_med_3_stack.mat', 't', 'V_in', 'V_out');
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% Compute Coherence and Transfer functions
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Ts = 1e-4;
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win = hann(ceil(0.1/Ts));
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[tf_1, f] = tfestimate(piezo1.V_in, piezo1.V_out, win, [], [], 1/Ts);
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[co_1, ~] = mscohere(piezo1.V_in, piezo1.V_out, win, [], [], 1/Ts);
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[tf_2, ~] = tfestimate(piezo2.V_in, piezo2.V_out, win, [], [], 1/Ts);
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[co_2, ~] = mscohere(piezo2.V_in, piezo2.V_out, win, [], [], 1/Ts);
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[tf_3, ~] = tfestimate(piezo3.V_in, piezo3.V_out, win, [], [], 1/Ts);
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[co_3, ~] = mscohere(piezo3.V_in, piezo3.V_out, win, [], [], 1/Ts);
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% We remove the phase delay due to the time delay of the ADC/DAC:
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angle_delay = 180/pi*angle(squeeze(freqresp(exp(-s*Ts), f, 'Hz')));
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figure;
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ax1 = subplot(2, 1, 1);
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hold on;
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plot(f, abs(tf_1), 'DisplayName', '1 stack')
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plot(f, abs(tf_2), 'DisplayName', '2 stacks')
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plot(f, abs(tf_3), 'DisplayName', '3 stacks')
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set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log');
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ylabel('Amplitude'); xlabel('Frequency [Hz]');
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hold off;
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legend('location', 'southwest');
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ylim([1, 40]);
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ax2 = subplot(2, 1, 2);
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hold on;
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plot(f, 180/pi*unwrap(angle(tf_1))-angle_delay)
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plot(f, 180/pi*unwrap(angle(tf_2))-angle_delay)
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plot(f, 180/pi*unwrap(angle(tf_3))-angle_delay)
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set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'lin');
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ylabel('Phase'); xlabel('Frequency [Hz]');
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hold off;
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ylim([-270, 90]);
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yticks(-360:90:90)
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linkaxes([ax1,ax2], 'x');
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xlim([10, 5000]);
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% PI
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piezo1 = load('pi_505_high.mat', 't', 'V_in', 'V_out');
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piezo2 = load('pi_505_high_2_stacks.mat', 't', 'V_in', 'V_out');
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piezo3 = load('pi_505_high_3_stacks.mat', 't', 'V_in', 'V_out');
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Ts = 1e-4;
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win = hann(ceil(0.1/Ts));
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[tf_1, f] = tfestimate(piezo1.V_in, piezo1.V_out, win, [], [], 1/Ts);
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[co_1, ~] = mscohere(piezo1.V_in, piezo1.V_out, win, [], [], 1/Ts);
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[tf_2, ~] = tfestimate(piezo2.V_in, piezo2.V_out, win, [], [], 1/Ts);
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[co_2, ~] = mscohere(piezo2.V_in, piezo2.V_out, win, [], [], 1/Ts);
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[tf_3, ~] = tfestimate(piezo3.V_in, piezo3.V_out, win, [], [], 1/Ts);
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[co_3, ~] = mscohere(piezo3.V_in, piezo3.V_out, win, [], [], 1/Ts);
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% We remove the phase delay due to the time delay of the ADC/DAC:
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angle_delay = 180/pi*angle(squeeze(freqresp(exp(-s*Ts), f, 'Hz')));
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figure;
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ax1 = subplot(2, 1, 1);
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hold on;
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plot(f, abs(tf_1), 'DisplayName', '1 stack')
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plot(f, abs(tf_2), 'DisplayName', '2 stacks')
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plot(f, abs(tf_3), 'DisplayName', '3 stacks')
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set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log');
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ylabel('Amplitude'); xlabel('Frequency [Hz]');
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hold off;
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legend('location', 'southwest');
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ylim([0.05, 11]);
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ax2 = subplot(2, 1, 2);
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hold on;
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plot(f, 180/pi*unwrap(angle(tf_1))-angle_delay)
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plot(f, 180/pi*unwrap(angle(tf_2))-angle_delay)
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plot(f, 180/pi*unwrap(angle(tf_3))-angle_delay)
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set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'lin');
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ylabel('Phase'); xlabel('Frequency [Hz]');
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hold off;
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ylim([-360, 0]);
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yticks(-360:90:90)
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linkaxes([ax1,ax2], 'x');
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xlim([10, 5000]);
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