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Fabrication and Characterization of a Low-Cost Piezoelectric using Rochelle
Salt for Energy Harvesting and Sensor Applications
make sure our data was consistent. The average d₃₃ value for our
Rochelle salt sensor came out to be at 04.2 pC/N, which was
within the expected range for materials like this.
This confirms that our sensor isn’t just working, it’s
performing exactly as a real piezoelectric device should.
Figure 56: Measurement of the d₃₃ piezoelectric coefficient using a
d₃₃ meter setup
Tapping Method for Piezoelectric Characterisation
During testing, the device consistently generated a clear voltage
response every time it was tapped. The output ranged between 250
to 450 millivolts (mV), with the maximum recorded peak reaching
712 mV.
These voltage spikes were captured using a digital
oscilloscope, showing a strong correlation with each mechanical
input (as shown in Figure 57). The consistent output confirmed
that the Rochelle salt layer was actively responding to pressure
and converting mechanical energy into a usable electrical signal.
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