Title :
Ultrasonic array sensor using piezoelectric film on silicon diaphragm and its resonant-frequency tuning
Author :
Yamashita, K. ; Murakami, H. ; Chansomphou, L. ; Okuyama, M.
Author_Institution :
Graduate Sch. of Eng. Sci., Osaka Univ., Toyonaka, Japan
Abstract :
Ultrasonic micro-array sensors using piezoelectric PZT (Pb(Zr,Ti)O/sub 3/) thin films on silicon diaphragms have been fabricated and their resonant frequency could be tuned after the device fabrication. The resonant frequencies of elements of the fabricated sensor array have scattered in 12% due to non-uniformity of material properties, dimensions of diaphragms and film thickness. The resonant frequency of each element has been tuned to an appropriate value by applying adequate electrical poling. Finally, the three-dimensional positions of objects have been successfully determined by using the tuned array sensor.
Keywords :
diaphragms; dielectric polarisation; lead compounds; microsensors; piezoelectric materials; piezoelectric thin films; tuning; ultrasonic devices; zirconium compounds; PZT; Pb(Zr,Ti)O/sub 3/ thin films; PbZrO3TiO3; Si; electrical poling; film thickness; material properties; piezoelectric film; resonant frequency; resonant-frequency tuning; sensor array; silicon diaphragm; silicon diaphragms; ultrasonic microarray sensor; Fabrication; Piezoelectric films; Resonance; Resonant frequency; Semiconductor thin films; Sensor arrays; Silicon; Thin film devices; Thin film sensors; Tuning;
Conference_Titel :
TRANSDUCERS, Solid-State Sensors, Actuators and Microsystems, 12th International Conference on, 2003
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-7731-1
DOI :
10.1109/SENSOR.2003.1215630
