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Piezo PVDF-TrFE Film

PVDF-TrFE copolymer piezo film has higher coupling factor (>0.30) than piezo PVDF film (~0.15) due to its lower dielectric constant (~8.0) and higher Young's modulus (>3 GPa). It is usually used in thickness mode (d33) for ultrasound transducers where it is used to generate acoustic wave under electrical excitation (actuator) and at the same time to measure the acoustic wave response (piezo sensor).

It shall be pointed out most PVDF-TrFE copolymer piezo film has much lower d31 and d32 than PVDF as the PVDF piezo film is usually oriented in the "1" direction with high d31 (>25 pC/N)