197 lines
5.9 KiB
Org Mode
197 lines
5.9 KiB
Org Mode
#+TITLE: Equipment
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:DRAWER:
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#+STARTUP: overview
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#+LANGUAGE: en
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#+EMAIL: dehaeze.thomas@gmail.com
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#+AUTHOR: Dehaeze Thomas
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#+HTML_LINK_HOME: ../index.html
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#+HTML_LINK_UP: ../index.html
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#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="https://research.tdehaeze.xyz/css/style.css"/>
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#+HTML_HEAD: <script type="text/javascript" src="https://research.tdehaeze.xyz/js/script.js"></script>
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#+HTML_MATHJAX: align: center tagside: right font: TeX
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#+PROPERTY: header-args:matlab :session *MATLAB*
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#+PROPERTY: header-args:matlab+ :comments org
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#+PROPERTY: header-args:matlab+ :results none
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#+PROPERTY: header-args:matlab+ :exports both
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#+PROPERTY: header-args:matlab+ :eval no-export
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#+PROPERTY: header-args:matlab+ :output-dir figs
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#+PROPERTY: header-args:latex :headers '("\\usepackage{tikz}" "\\usepackage{import}" "\\import{$HOME/Cloud/tikz/org/}{config.tex}")
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#+PROPERTY: header-args:latex+ :imagemagick t :fit yes
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#+PROPERTY: header-args:latex+ :iminoptions -scale 100% -density 150
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#+PROPERTY: header-args:latex+ :imoutoptions -quality 100
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#+PROPERTY: header-args:latex+ :results file raw replace
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#+PROPERTY: header-args:latex+ :buffer no
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#+PROPERTY: header-args:latex+ :eval no-export
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#+PROPERTY: header-args:latex+ :exports results
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#+PROPERTY: header-args:latex+ :mkdirp yes
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#+PROPERTY: header-args:latex+ :output-dir figs
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#+PROPERTY: header-args:latex+ :post pdf2svg(file=*this*, ext="png")
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#+PROPERTY: header-args:shell :eval no-export
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:END:
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* Geophones
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*** L-28LB
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- http://www.sercel.com/products/Pages/seismometers.aspx
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- [[file:files/Geophones_specifications_Sercel_EN.pdf][Data Sheet]].
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#+name: fig:L28LB
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#+caption: Picture of the L-28LB Geophone
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[[file:./figs/L28LB.png]]
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#+name: tab:L-28LB
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#+caption: L-28LB Parameters
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| Natural Frequency [Hz] | 4.5 |
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| Weight [g] | 140 |
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| Sensitivity [V/(m/s)] | 31.3 |
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We define the parameters of the geophone and we plot its bode plot (figure [[fig:L28LB_bode_plot]]).
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#+begin_src matlab :results none
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w0 = 4.5*2*pi; % [rad/s]
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ksi = 0.38;
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G0 = 31.3; % [V/(m/s)]
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G = G0*(s/w0)^2/((s/w0)^2 + 2*ksi*(s/w0) + 1);
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#+end_src
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#+begin_src matlab :results none :exports none
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freqs = logspace(-1, 2, 1000);
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figure;
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ax1 = subplot(2,1,1);
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plot(freqs, abs(squeeze(freqresp(G, freqs, 'Hz'))));
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set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
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set(gca, 'XTickLabel',[]);
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ylabel('Magnitude [V/(m/s)]');
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ax2 = subplot(2,1,2);
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plot(freqs, 180/pi*angle(squeeze(freqresp(G, freqs, 'Hz'))));
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set(gca,'xscale','log');
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yticks(-180:90:180);
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ylim([-180 180]);
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xlabel('Frequency [Hz]'); ylabel('Phase [deg]');
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linkaxes([ax1,ax2],'x');
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xlim([fmin, fmax]);
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#+end_src
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#+NAME: fig:L28LB_bode_plot
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#+HEADER: :tangle no :exports results :results raw :noweb yes
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#+begin_src matlab :var filepath="figs/L28LB_bode_plot.pdf" :var figsize="wide-tall" :post pdf2svg(file=*this*, ext="png")
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<<plt-matlab>>
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#+end_src
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#+NAME: fig:L28LB_bode_plot
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#+CAPTION: Bode plot of the L-28LB Geophone
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#+RESULTS: fig:L28LB_bode_plot
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[[file:figs/L28LB_bode_plot.png]]
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*** L-4C
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- http://www.sercel.com/products/Pages/seismometers.aspx
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- [[file:files/Geophones_specifications_Sercel_EN.pdf][Data Sheet]].
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#+name: fig:L4C
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#+caption: Picture of the L-4C Geophone
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[[file:./figs/L4C.png]]
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#+name: tab:L4C
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#+caption: L4C Parameters
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| Natural Frequency [Hz] | 1 |
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| Weight [g] | 2150 |
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| Sensitivity [V/(m/s)] | 276.8 |
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#+begin_src matlab :tangle no :exports none :results silent :noweb yes :var current_dir=(file-name-directory buffer-file-name)
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<<matlab-dir>>
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#+end_src
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#+begin_src matlab :exports none :results silent :noweb yes
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<<matlab-init>>
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#+end_src
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The transfer function from the velocity and the measured voltage is defined below.
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Its bode plot is shown on figure [[fig:L4C_bode_plot]].
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#+begin_src matlab :results none
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w0 = 2*pi; % [rad/s]
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ksi = 0.28;
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G0 = 276.8; % [V/(m/s)]
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G = G0*(s/w0)^2/((s/w0)^2 + 2*ksi*(s/w0) + 1);
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#+end_src
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#+begin_src matlab :results none :exports none
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freqs = logspace(-2, 2, 1000);
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figure;
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ax1 = subplot(2,1,1);
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plot(freqs, abs(squeeze(freqresp(G, freqs, 'Hz'))));
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set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
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set(gca, 'XTickLabel',[]);
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ylabel('Magnitude [V/(m/s)]');
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ax2 = subplot(2,1,2);
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plot(freqs, 180/pi*angle(squeeze(freqresp(G, freqs, 'Hz'))));
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set(gca,'xscale','log');
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yticks(-180:90:180);
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ylim([-180 180]);
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xlabel('Frequency [Hz]'); ylabel('Phase [deg]');
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linkaxes([ax1,ax2],'x');
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xlim([fmin, fmax]);
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#+end_src
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#+NAME: fig:L4C_bode_plot
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#+HEADER: :tangle no :exports results :results raw :noweb yes
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#+begin_src matlab :var filepath="figs/L4C_bode_plot.pdf" :var figsize="wide-tall" :post pdf2svg(file=*this*, ext="png")
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<<plt-matlab>>
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#+end_src
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#+NAME: fig:L4C_bode_plot
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#+CAPTION: Bode plot of the L4C Geophone
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#+RESULTS: fig:L4C_bode_plot
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[[file:figs/L4C_bode_plot.png]]
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*** L-22
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- https://www.passcal.nmt.edu/content/instrumentation/sensors/short-period-sensors/l-22-sp-sensor
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* Accelerometers
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*** Pieozoelectric acc. 356b18 - 3 axis
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- https://www.pcbpiezotronics.fr/produit/accelerometres/356b18/
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- [[file:files/356B18_G.pdf][Data Sheet]].
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#+name: fig:356b18
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#+caption: Pieozoelectric acc. 356b18 - 3 axis
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[[file:./figs/356b18.jpg]]
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#+name: tab:356b18
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#+caption: 356b18 Parameters
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| Sensitivity | 0.102 $V/(m/s^2)$ |
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| Measurement Range | 4.9 $m/s^2$ pk |
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| Frequency Range | 0.5 to 3000 Hz |
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| resonant frequency | > 20000 hz |
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| broadband resolution | 0.0005 $m/s^2$ rms |
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*** Ceramic acc. 393B05 - 1 axis
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- http://www.pcb.com/products.aspx?m=393B05
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- [[file:files/393B05_K.pdf][Data Sheet]].
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#+name: fig:393b05
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#+caption: Ceramic acc. 393B05 - 1 axis
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[[file:./figs/393b05.jpg]]
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#+name: tab:393B05
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#+caption: 393B05 Parameters
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| Sensitivity (±10 %) | 1.02 $V/(m/s^2)$ |
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| Measurement Range | 4.9 $m/s^2$ pk |
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| Frequency Range (±5 %) | 0.7 to 450 Hz |
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| resonant frequency | > 2500 hz |
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| broadband resolution | 0.00004 $m/s^2$ rms |
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* Modal analysis
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http://www.oros.com/3900-oros-modal-2.htm
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