 In the case of transversal effect, a force Fy in the direction of one of the neutral axes y produces a charge on the surfaces of the corresponding polar axis x. In contrast to the longitudinal piezoelectric effect the magnitude of this charge, which occurs on unloaded surfaces, is dependent on the geometrical dimensions of the piezoelectric element. Assuming element dimensions a and b, the charge is (for quartz and PiezoStar):
Qx = –d11 · Fy · b/a
Thus, the transversal effect makes it possible to obtain a greater charge by suitable shaping and alignment of the piezoelectric elements. Elements with a transversal effect can be used for high-sensitivity pressure, strain and force sensors.
Other Piezoeffects:
d11: piezoelectric coefficient (–2.3 pC/N for quartz crystals)
Fy: force in y-direction
b,a: dimensions of the piezoelectric element
Back to Piezoeffect
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