Title :
Patterned piezoelectricity in charged, cellular polymers for air-borne ultrasound devices
Author :
Hoislbauer, H. ; Schwödiauer, R. ; Bauer-Gogonea, S. ; Bauer, S.
Author_Institution :
Dept. Appl. Phys., Johannes Kepler Univ., Linz, Austria
Abstract :
Soft, flexible and sensitive piezoelectric materials are in demand for applications, like piezoelectric phased arrays for direction sensitive acoustic wave detection and emission. Here we report on air-borne ultrasound generation with novel piezoelectric polymers: charged, cellular polypropylene foams from VTT Chemical Technology. Based on polymer foams, two focusing devices have been developed and acoustically characterised: spherical acoustical sound generators and acoustical Fresnel zone plates. Both devices may pave the way for simple tools for non-destructive materials inspection.
Keywords :
acoustic generators; foams; piezoelectric materials; piezoelectric transducers; polymers; ultrasonic focusing; ultrasonic transducers; zone plates; acoustical Fresnel zone plate; air-borne ultrasound device; charged cellular polymer; focusing device; nondestructive materials inspection; patterned piezoelectricity; polypropylene foam; spherical acoustical sound generator; Acoustic arrays; Acoustic signal detection; Acoustic waves; Chemical technology; Phase detection; Phased arrays; Piezoelectric materials; Piezoelectricity; Polymer foams; Ultrasonic imaging;
Conference_Titel :
Electrets, 2002. ISE 11. Proceedings. 11th International Symposium on
Print_ISBN :
0-7803-7560-2
DOI :
10.1109/ISE.2002.1042943
