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. Author manuscript; available in PMC: 2018 Jul 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2017 May 8;64(7):1078–1086. doi: 10.1109/TUFFC.2017.2702010

TABLE I.

Materials and dimensions for designed transducer

Structure Material Dimension Acoustic Impedance vl
(m/s)		 kt εS33/ε0 Attenuation(dB/cm/MHz)
Light acoustic backing Epoxy ~ 0.5 mm (radius) 3.1 MRayl 2680 – – 0.46
Low frequency piezoelectric element PZT-5H 1–3 composite 1.1 × 3.5 × 0.350 mm3 19.8 MRayl 3740 0.65 660 –
Low frequency matching layer A12O3 (25%)/epoxy 1.1 × 3.5 × 0.180 mm3 5.6 MRayl 2800 – – 5.3
Frequency-selective isolation layer (FSIL) Al2O3 (25%)/epoxy 1.1 × 0.5 × 0.055 mm3 5.6 MRayl 2800 – – 5.3
High frequency piezoelectric element PZT-5H 1.1 × 0.5 × 0.108 mm3 34.2 MRayl 3850 0.50 1470 –
High frequency matching layer Al2O3 (25%)/epoxy 1.1 × 3.3 × 0.038 mm3 5.6 MRayl 2800 – – 5.3