72 lines
1.8 KiB
Matlab
72 lines
1.8 KiB
Matlab
% Matlab Init :noexport:ignore:
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%% dcm_noise_budget.m
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% Basic uniaxial noise budgeting
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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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%% Path for functions, data and scripts
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addpath('./mat/'); % Path for data
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%% Simscape Model - Nano Hexapod
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addpath('./STEPS/')
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%% Colors for the figures
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colors = colororder;
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%% Frequency Vector
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freqs = logspace(1, 3, 1000);
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%% Frequency vector for noise budget [Hz]
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f = logspace(-1, 3, 1000);
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% Power Spectral Density of signals
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% Interferometer noise:
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Wn = 6e-11*(1 + s/2/pi/200)/(1 + s/2/pi/60); % m/sqrt(Hz)
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% #+RESULTS:
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% : Measurement noise: 0.79 [nm,rms]
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% DAC noise (amplified by the PI voltage amplifier, and converted to newtons):
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Wdac = tf(3e-8); % V/sqrt(Hz)
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Wu = Wdac*22.5*10; % N/sqrt(Hz)
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% #+RESULTS:
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% : DAC noise: 0.95 [uV,rms]
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% Disturbances:
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Wd = 5e-7/(1 + s/2/pi); % m/sqrt(Hz)
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%% Save ASD of noise and disturbances
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save('mat/asd_noises_disturbances.mat', 'Wn', 'Wu', 'Wd');
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% Open Loop disturbance and measurement noise
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% The comparison of the amplitude spectral density of the measurement noise and of the jack parasitic motion is performed in Figure [[fig:open_loop_noise_budget_fast_jack]].
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% It confirms that the sensor noise is low enough to measure the motion errors of the crystal.
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%% Bode plot for the plant (strain gauge output)
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figure;
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hold on;
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plot(f, abs(squeeze(freqresp(Wn, f, 'Hz'))), ...
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'DisplayName', 'n');
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plot(f, abs(squeeze(freqresp(Wd, f, 'Hz'))), ...
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'DisplayName', 'd');
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hold off;
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set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
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xlabel('Frequency [Hz]'); ylabel('ASD [$m/\sqrt{Hz}$]');
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legend('location', 'northeast', 'FontSize', 8, 'NumColumns', 2);
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xlim([f(1), f(end)]);
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