Tips Regarding Piezoelectric Measurement Technology; Functionality Of Piezoelectric Sensors - HBM CMA Series Operating Manual

Tips regarding piezoelectric measurement technology

9 Tips regarding piezoelectric measurement
technology
Piezoelectric force sensors offer a series of advantages: They are
extraordinarily compact, offer extremely high overload capacity when the
measurement chain is correctly laid out and evidence negligible displacement.
This results in high rigidity and therefore excellent dynamic properties.
In order to ensure maximum measurement accuracy with high operating
safety, some information should be taken into account.
9.1

Functionality of piezoelectric sensors

A piezoelectric force sensor consists of a single crystal sensor element and
components used for force application.
Fig. 9.1 Working principle of a piezoelectric transducer
Forces acting on the crystal make the positive and negative atoms in the
crystal grid move. This results in charges on the upper and lower sides as
shown in Fig. 9.1. The shifting of the atoms is proportional to the applied force
and therefore the charges formed on the crystal surfaces.
In Fig. 9.2, two piezoelectric quartz rings are surrounded by an enclosure of 2
metal half shells. The coaxial plug on the left has external contact with the
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