Title :
Patterning of 30MHz ultrasonic Fresnel zone plate by laser poling of PVDF-TrFE film
Author :
Yanagida, Hirotaka ; Tamura, Yasutaka ; Takahashi, Tatsuhisa
Author_Institution :
Dept. of Inf., Yamagata Univ., Yonezawa, Japan
Abstract :
This paper describes a novel approach to construct Fresnel zone plate (FZP) transducers by laser poling of poly vinyliden fluoride-co- trifluoroethylene films. The patterning of polarization was confirmed by measurement of pyroelectricity current. After this confirmation, the transducer was driven in the water bath and the spatial distribution of the sound pressure was measured. The directivity of the transducer was compared to the flat and concave transducers of same aperture size.
Keywords :
dielectric polarisation; laser beam applications; piezoelectric thin films; piezoelectric transducers; polymer blends; polymer films; pyroelectricity; ultrasonic transducer arrays; zone plates; FZP transducer construction; PVDF-TrFE film; frequency 30 MHz; laser poling; polarisation patterning; polyvinylidene fluoride-co-trifluoroethylene films; pyroelectricity current; sound pressure spatial distribution; transducer directivity; ultrasonic Fresnel zone plate patterning; Acoustic transducers; Choppers; Electrodes; Fresnel reflection; Glass; Laser theory; Power lasers; Pyroelectricity; Ultrasonic transducer arrays; Ultrasonic transducers; Fresnel zone plate; optical poling; poly vinyliden fluoride -co- trifluoroethylene(PVDF-TrFE);
Conference_Titel :
Ultrasonics Symposium (IUS), 2009 IEEE International
Conference_Location :
Rome
Print_ISBN :
978-1-4244-4389-5
Electronic_ISBN :
1948-5719
DOI :
10.1109/ULTSYM.2009.5441937
