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Piezoeletric voltage generation calculation

  1. Apr 29, 2009 #1

    I was wondering if someone could post or create/explain a simple piezoeletric problem in which a stress acts on a piezo material and creates a voltage.

    I want to be able to understand how to caculate the voltage generated and current created.

    Thanks for any help
  2. jcsd
  3. Apr 30, 2009 #2
    Try here, under applications.
  4. Apr 30, 2009 #3
    Thanks Timmay!
  5. Apr 30, 2009 #4
    Ok real quick so I followed throught it and understand

    But when the start working the problem they say

    d33= 25 pC/N

    but when the work the problem the use 10.10^-10 for their e value to C???
    shouldnt that e be 25pC/N????
  6. May 1, 2009 #5
    The first expression calculates the capacitance C of the sensor. Epsilon is the electrical permittivity of the material, A is the area, t thickness. C'' is the capacitance per unit area.

    [tex]C^{''} = \frac {\epsilon} {t}[/tex]

    [tex]C = \frac {\epsilon A} {t}[/tex]

    [tex]C = 10E^{-10}\times\frac {1E^{-2}*1E^{-2}} {100E^{-6}}[/tex]

    [tex]C = 100 pF[/tex]

    To calculate the charge generated under a load of 10 N:

    [tex]Q = 25 pC/N \times 10 N = 250 pC[/tex]

    Knowing the relationship between voltage, charge and capacitance:

    [tex]V = \frac {Q} {C}[/tex]

    [tex]V = \frac {250 pC} {100 pF}[/tex]

    [tex]V = 2.5 V[/tex]

    Make a bit more sense?
    Last edited: May 1, 2009
  7. Dec 2, 2010 #6
    Where exactly did you find these calculations. Im currently in a research team in highschool working on developing piezoelectric nanofibers.
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