Fundamental Study on Vibration in Edge Face of Piezoelectric Chiral Polymer Film

We evaluate the vibration in the edge face of a poly(l-lactic acid) (PLLA) film from the propagated signal of an ultrasonic wave generated by the excitation force of the edge. Although the excitation area is too small to drive the edge face, the vibration can be measured only using the fixing method...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 52; no. 9; pp. 09KE01 - 09KE01-5
Main Authors Takarada, Jun, Kataoka, Takuya, Yamamoto, Ken, Nakiri, Takuo, Kato, Atsuko, Yoshida, Tetsuo, Tajitsu, Yoshiro
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.09.2013
Subjects
Bursting
Excitation
Ferroelectric materials
Mathematical analysis
Piezoelectricity
Polymeric films
Resonators
Transducers
Vibration
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Summary:We evaluate the vibration in the edge face of a poly(l-lactic acid) (PLLA) film from the propagated signal of an ultrasonic wave generated by the excitation force of the edge. Although the excitation area is too small to drive the edge face, the vibration can be measured only using the fixing method that does not suppress the resonance and the equipment with a high signal-to-noise ratio. This is considered to be due to the fact that the theoretically calculated force of the PLLA film is more than 10 times larger than that of a well-known ferroelectric polymer film, poly(vinylidene fluoride). We confirm that the film functions as a resonator and can be applied to a resonated transducer. In spite of the vibration in the edge face of the polymer film, we observe compliant responses to excitations by burst or rectangular waves. The practicality of a resonator can be suggested.
Bibliography:Deformation of film under electric AC field applied between one surface and adverse face, and fixing one whole edge of the film: (a) film with tensile piezoelectricity and (b) film with shear piezoelectricity. Fixing and shaping methods for changing direction of vibration from the tangential direction with respect to edge to normal direction. Size of PLLA sample and fixing conditions: (a) unfixing, and (b) fixing one whole edge, and (c) fixing part of an edge. Admittance magnitude and phase characteristics around the resonance frequency of vibration of the edge face. Experimental setup for measuring the ultrasonic vibration caused by excitation force of edge face of PLLA film. Continuous waveforms of the voltage: (a) driving voltage and (b) received voltage by ultrasonic sensor. Frequency characteristics of received voltage under driving vibration from edge face of PLLA film: the film was applied with voltages of (a) 10, (b) 20, and (c) 30 V. Amplitude characteristics of driving voltage versus received voltage in continuous waves in sine and rectangular forms. Amplitude of received voltage under changing number of bursts.
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.52.09KE01