Table 1.

Sensor material parameters for a PZT-5H ceramic [15].

	Symbol	Magnitude	Dimensions
Elastic constant	$c_{33}$	$11.74\times {10}^{10}$	N$·{\mathrm{m}}^{-2}$
Piezoelectric stress coefficient	$e_{33}$	$23.3$	C$·{\mathrm{m}}^{-2}$
Permittivity tensor element	${ϵ}_{33}$	$1.47\times {10}^3$	-
Density	${\rho }_T$	$7.5\times {10}^3$	kg$·{\mathrm{m}}^{-3}$
Parallel electrical load	$Z_p$	${10}^3$	Ω
Series electrical load	$Z_0$	50	Ω
Fractal length	l	1	mm