11. Ouputs

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Extracting data from CMUTS is exactly the same as is in normal OnScale models. For comparison with some of the typical experimental metrics the following points are useful to note:

  • Use POUT as normal
  • Extract the Drive Function for normalisation of FFTs in post-processing
  • Extract the out-of-plane displacement at the center of the membrane. A good measure of the peak deflection for specific input conditions
  • Extract Voltage and Charge on the active electrode. Allows for impedance curves to be created
  • Extract average displacement from the front face of the membrane. Good comparison with some laser vibrometry results and can be used to calculate pressure in a load analytically.
  • Extract average pressure a few elements from the front face of the device. Good for comparison with hydrophone measurements, and for calculating operating frequency.
  • Harmonic shapes can be extracted as normal via the shap command.
calc
    disp
    pres aprs
    avrg ffydsp ydsp * regn $i1 $i2 $j4 $j4
    avrg ffpres aprs * regn $i1 $i2 $j4+10 $j4+10
    end

pout
    hist func                     /* drive function - 1
    histname electrode vq ctop    /* voltage and charge TOP electrodes - 2, 3
    histname avrg a all           /* average displacement on membrane - 4, 5 (disp, pres)
    hist ydsp $i1 $i2 1 $j4 $j4 1 /* thickness displacement on top membrane nodes - 6+
    end
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