REFERENCES
- Barbieri , E. and Figueroa , F. Experiments on identification and control of flexible structures using an ultrasonic ranging system . IEEE International Conference on Systems Engineering . pp. 17 – 20 .
- Wu , L. Z. , Zeng , Y. S. and He , H. G. Novel ultrasonic ranging approach based on spread spectrum modulation . IEEE International Conference on Communication Technology . pp. 1 – 4 .
- Lee , W. S. and Lee , S. S. 2008 . Piezoelectric microphone built on circular diaphragm . Sensors and actuators A-Physical , 144 ( 2 ) : 367 – 373 .
- Lee , H. , Kang , D. and Moon , W. Design and fabrication of the high directional ultrasonic ranging sensor to enhance the spatial resolution . Transducers1907 . pp. 1303 – 1306 .
- Luan , G. D. , Zhang , J. D. and Wang , R. Q. 2005 . Piezoelectric transducer and transducer array , 352 – 392 . Peking University Press .
- Wang , Z. , Zhu , W. Zhu , H. 2005 . Fabrication and characterization of piezoelectric micromachined ultrasonic transducers with thick composite PZT films . IEEE Trans. Ultrason. Ferroelectr. Freq. Contr. , 52 : 2289 – 2297 .
- Wang , C. , Wang , Z. Y. , Ren , T. L. , Zhu , Y. P. , Yang , Y. Liu , L. T. 2007 . A micromachined piezoelectric ultrasonic transducer operating in d33 mode using square interdigital electrodes . IEEE Sensors Journal , 7 ( 8 ) : 967 – 976 .
- Ren , T. L. , Zhu , Y. P. , Yang , Y. , Liu , L. T. and Li , Z. J. 2006 . Micro acoustic devices using piezoelectric films . Integrated Ferroelectrics , 80 : 331 – 340 .