45 lines
1.3 KiB
Matlab
45 lines
1.3 KiB
Matlab
piezo1 = load('mat/cedrat_la75b_med_1_stack.mat', 't', 'V_in', 'V_out');
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piezo2 = load('mat/cedrat_la75b_med_2_stack.mat', 't', 'V_in', 'V_out');
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piezo3 = load('mat/cedrat_la75b_med_3_stack.mat', 't', 'V_in', 'V_out');
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%%
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run setup;
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win = hann(ceil(0.1/Ts));
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[tf_1, f_1] = 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, f_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, f_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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%%
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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_1, abs(tf_1), 'DisplayName', '1 stack')
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plot(f_2, abs(tf_2), 'DisplayName', '2 stacks')
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plot(f_3, 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([0.1, 20]);
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ax2 = subplot(2, 1, 2);
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hold on;
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plot(f_1, 180/pi*unwrap(angle(tf_1)))
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plot(f_2, 180/pi*unwrap(angle(tf_2)))
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plot(f_3, 180/pi*unwrap(angle(tf_3)))
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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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linkaxes([ax1,ax2], 'x');
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xlim([10, 5000]); |