Fig. 3
From: Self-Powered Active Sensor with Concentric Topography of Piezoelectric Fibers
Validated polarity via forward and reverse connections measurements. The shape of output signal changed as switching the measurement polarity. a The peak voltage and currents generated by the PGCT of about 2.5 V and current of about 150 nA were obtained in the forward connection. b The output voltages and currents generated by the PGCT of about ~1 V and about ~150 nA in the reverse connection