Title :
Sound isolation by piezoelectric polymer films connected to negative capacitance circuits
Author :
Fukada, E. ; Date, M. ; Kimura, K. ; Okubo, T. ; Kodama, H. ; Mokry, P. ; Yamamoto, K.
Author_Institution :
Kobayasi Inst. of Phys. Res., Tokyo, Japan
fDate :
4/1/2004 12:00:00 AM
Abstract :
Sound isolation has been achieved using a piezoelectric polymer film connected to a negative capacitance feedback circuit. A curved PVDF film was located in the middle of an acoustic tube and the transmission loss of sound through the film was determined in the audio frequency range. At any chosen frequency, the complete isolation of sound was achieved by adjusting the feedback, i.e. the complex capacitance of the circuit was matched precisely to that of the film.
Keywords :
capacitance; piezoelectric materials; polymer films; PVDF film; acoustic tube; audio frequency range; negative capacitance circuits; piezoelectric polymer films; sound isolation; sound transmission loss; Capacitance; Capacitive sensors; Electrodes; Feedback circuits; Piezoelectric films; Piezoelectric materials; Piezoelectric polarization; Polymer films; Vibrations; Voltage;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2004.1285904