Title :
Properties of transverse ultrasonic transducers of ferroelectric polymers working in thickness shear modes
Author :
Omote, Kenji ; Ohigashi, Hiroji
Author_Institution :
Dept. of Mater. Sci. & Eng., Yamagata Univ., Yonezawa, Japan
fDate :
3/1/1996 12:00:00 AM
Abstract :
Shear piezoelectric properties of poly(vinylidene fluoride) (PVDF) and copolymer of vinylidene fluoride and trifluoroethylene [P(VDF/TrFE)] have been studied precisely in a wide temperature range from 10 to 400 K. It was found that these polymers have the shear electromechanical coupling factors k/sub 15/ and k/sub 24/ large enough to be utilized for transverse ultrasonic transducers operating in a wide frequency range and in a wide temperature range below 400 K. Shear mode ultrasonic transducers of P(VDF/TrFE) were fabricated and their performances were studied both experimentally and theoretically. The shear polymer transducers are useful for generation and detection of transverse ultrasonic waves.
Keywords :
ferroelectric devices; ferroelectric materials; ferroelectric thin films; piezoelectric materials; piezoelectric thin films; piezoelectric transducers; polymer blends; polymers; ultrasonic transducers; 10 to 400 K; P(VDF/TrFE); PVDF; copolymer; ferroelectric polymers; poly(vinylidene fluoride); shear electromechanical coupling factors; shear mode ultrasonic transducers; shear piezoelectric properties; shear polymer transducers; thickness shear modes; transverse ultrasonic transducers; transverse ultrasonic waves; trifluoroethylene; vinylidene fluoride; wide frequency range; wide temperature range; Electrodes; Ferroelectric materials; Frequency; Piezoelectric effect; Piezoelectric films; Piezoelectric transducers; Polymer films; Resonance; Temperature distribution; Ultrasonic transducers;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
