HBM CMD Serie Bedienungsanleitung Seite 66

Tips for piezoelectric measurement technology
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Fig. 14.2 Cross‐section through a force washer
The charge present on the outer surfaces of the crystal is
picked up by electrodes and can be processed by a
so‐called charge amplifier into a voltage or current signal.
The sensitivity of piezoelectric force sensors is given in
pC/N. The output signal can be calculated by
Q = d * F * n
Here F is the applied force in N, d the sensitivity of the
sensor material being used in pC/N, Q the electric charge
in pC and n the number of crystal discs (1 pC = 10
Important
Piezoelectric sensors always need to work under
(mechanical) pre‐stress.
The sensitivity of the force sensor is determined by the
piezo material used and is independent of the measuring
A2781-3.1 HBM: public
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C).
CMD