194 lines
5.3 KiB
Matlab
194 lines
5.3 KiB
Matlab
% Matlab Init :noexport:ignore:
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current_dir='/home/thomas/MEGA/These/meas/slip-ring-test/';
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%% 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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% Load data
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% We load the data of the z axis of two geophones.
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sr_off = load('mat/data_012.mat', 'data'); sr_off = sr_off.data;
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sr_on = load('mat/data_013.mat', 'data'); sr_on = sr_on.data;
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% Time Domain
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% We compare the signal when the Slip-Ring is OFF (figure [[fig:sr_geophone_time_off]]) and when it is ON (figure [[fig:sr_geophone_time_on]]).
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figure;
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hold on;
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plot(sr_off(:, 3), sr_off(:, 1), 'DisplayName', 'Direct');
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plot(sr_off(:, 3), sr_off(:, 2), 'DisplayName', 'Slip-Ring');
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hold off;
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legend('Location', 'northeast');
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xlabel('Time [s]');
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ylabel('Voltage [V]');
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% #+NAME: fig:sr_geophone_time_off
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% #+CAPTION: Comparison of the time domain signals when the slip-ring is OFF
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% #+RESULTS: fig:sr_geophone_time_off
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% [[file:figs/sr_geophone_time_off.png]]
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figure;
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hold on;
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plot(sr_on(:, 3), sr_on(:, 1), 'DisplayName', 'Direct');
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plot(sr_on(:, 3), sr_on(:, 2), 'DisplayName', 'Slip-Ring');
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hold off;
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legend('Location', 'northeast');
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xlabel('Time [s]');
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ylabel('Voltage [V]');
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% Frequency Domain
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% We first compute some parameters that will be used for the PSD computation.
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dt = sr_off(2, 3)-sr_off(1, 3);
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Fs = 1/dt; % [Hz]
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win = hanning(ceil(10*Fs));
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% Then we compute the Power Spectral Density using =pwelch= function.
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% Direct measure
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[pxdoff, ~] = pwelch(sr_off(:, 1), win, [], [], Fs);
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[pxdon, ~] = pwelch(sr_on(:, 1), win, [], [], Fs);
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% Slip-Ring measure
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[pxsroff, f] = pwelch(sr_off(:, 2), win, [], [], Fs);
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[pxsron, ~] = pwelch(sr_on(:, 2), win, [], [], Fs);
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% Finally, we compare the Amplitude Spectral Density of the signals (figure [[fig:sr_geophone_asd]]);
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figure;
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hold on;
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plot(f, sqrt(pxdoff), 'DisplayName', 'Direct - OFF');
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plot(f, sqrt(pxsroff), 'DisplayName', 'Slip-Ring - OFF');
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plot(f, sqrt(pxdon), 'DisplayName', 'Direct - ON');
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plot(f, sqrt(pxsron), 'DisplayName', 'Slip-Ring - ON');
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hold off;
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set(gca, 'xscale', 'log');
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set(gca, 'yscale', 'log');
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xlabel('Frequency [Hz]'); ylabel('ASD of the measured Voltage $\left[\frac{V}{\sqrt{Hz}}\right]$')
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legend('Location', 'northeast');
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xlim([0.1, 500]);
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% #+NAME: fig:sr_geophone_asd
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% #+CAPTION: Comparison of the Amplitude Spectral Sensity
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% #+RESULTS: fig:sr_geophone_asd
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% [[file:figs/sr_geophone_asd.png]]
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xlim([100, 500]);
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% Load data
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% We load the data of the z axis of two geophones.
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sr_lpf_off = load('mat/data_016.mat', 'data'); sr_lpf_off = sr_lpf_off.data;
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sr_lpf_on = load('mat/data_017.mat', 'data'); sr_lpf_on = sr_lpf_on.data;
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% Time Domain
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% We compare the signal when the Slip-Ring is OFF (figure [[fig:sr_lpf_geophone_time_off]]) and when it is ON (figure [[fig:sr_lpf_geophone_time_on]]).
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figure;
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hold on;
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plot(sr_lpf_off(:, 3), sr_lpf_off(:, 1), 'DisplayName', 'Direct');
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plot(sr_lpf_off(:, 3), sr_lpf_off(:, 2), 'DisplayName', 'Slip-Ring');
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hold off;
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legend('Location', 'northeast');
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xlabel('Time [s]');
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ylabel('Voltage [V]');
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% #+NAME: fig:sr_lpf_geophone_time_off
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% #+CAPTION: Comparison of the time domain signals when the slip-ring is OFF
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% #+RESULTS: fig:sr_lpf_geophone_time_off
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% [[file:figs/sr_lpf_geophone_time_off.png]]
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figure;
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hold on;
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plot(sr_lpf_on(:, 3), sr_lpf_on(:, 1), 'DisplayName', 'Direct');
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plot(sr_lpf_on(:, 3), sr_lpf_on(:, 2), 'DisplayName', 'Slip-Ring');
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hold off;
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legend('Location', 'northeast');
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xlabel('Time [s]');
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ylabel('Voltage [V]');
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% Frequency Domain
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% We first compute some parameters that will be used for the PSD computation.
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dt = sr_lpf_off(2, 3)-sr_lpf_off(1, 3);
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Fs = 1/dt; % [Hz]
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win = hanning(ceil(10*Fs));
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% Then we compute the Power Spectral Density using =pwelch= function.
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% Direct measure
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[pxd_lpf_off, ~] = pwelch(sr_lpf_off(:, 1), win, [], [], Fs);
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[pxd_lpf_on, ~] = pwelch(sr_lpf_on(:, 1), win, [], [], Fs);
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% Slip-Ring measure
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[pxsr_lpf_off, f] = pwelch(sr_lpf_off(:, 2), win, [], [], Fs);
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[pxsr_lpf_on, ~] = pwelch(sr_lpf_on(:, 2), win, [], [], Fs);
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% Finally, we compare the Amplitude Spectral Density of the signals (figure [[fig:sr_lpf_geophone_asd]]);
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figure;
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hold on;
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plot(f, sqrt(pxd_lpf_off), 'DisplayName', 'Direct - OFF');
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plot(f, sqrt(pxsr_lpf_off), 'DisplayName', 'Slip-Ring - OFF');
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plot(f, sqrt(pxd_lpf_on), 'DisplayName', 'Direct - ON');
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plot(f, sqrt(pxsr_lpf_on), 'DisplayName', 'Slip-Ring - ON');
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hold off;
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set(gca, 'xscale', 'log');
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set(gca, 'yscale', 'log');
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xlabel('Frequency [Hz]'); ylabel('ASD of the measured Voltage $\left[\frac{V}{\sqrt{Hz}}\right]$')
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legend('Location', 'northeast');
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xlim([0.1, 500]);
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% #+NAME: fig:sr_lpf_geophone_asd
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% #+CAPTION: Comparison of the Amplitude Spectral Sensity
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% #+RESULTS: fig:sr_lpf_geophone_asd
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% [[file:figs/sr_lpf_geophone_asd.png]]
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xlim([100, 500]);
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% Comparison of with and without LPF
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figure;
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hold on;
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plot(f, sqrt(pxdon), 'DisplayName', 'Direct - ON');
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plot(f, sqrt(pxsron), 'DisplayName', 'Slip-Ring - ON');
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plot(f, sqrt(pxd_lpf_on), 'DisplayName', 'Direct - ON - LPF');
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plot(f, sqrt(pxsr_lpf_on), 'DisplayName', 'Slip-Ring - ON - LPF');
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hold off;
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set(gca, 'xscale', 'log');
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set(gca, 'yscale', 'log');
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xlabel('Frequency [Hz]'); ylabel('ASD of the measured Voltage $\left[\frac{V}{\sqrt{Hz}}\right]$')
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legend('Location', 'northeast');
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xlim([0.1, 500]);
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