Longitudinal Effect

The charge output occurs at the force contact surfaces and can be measured in this area. In the case of a longitudinal piezoelectric effect, the magnitude of the electric charge Q depends only on the force Fx applied and the dimensions of the crystal discs are immaterial. The only way to increase this charge is to connect several discs mechanically in series and electrically in parallel. If this is done, the size of the output charge is (for quartz and PiezoStar):

Q_x = d₁₁ · F_x · n

The piezoelectric coefficient d11 indicates the crystal’s degree of force sensitivity in the direction of the corresponding axis. The position of the crystal cut therefore determines the properties and the area of application for the quartz force link. Piezo-elements cut to produce a longitudinal effect are sensitive to compression forces and are therefore suitable for simple and sturdy sensors used to measure.

Other Piezoeffects:

• Shear Effect
• Transverse Effect

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