Title :
Miniature Doppler probe using a unidirectional SAW transducer
Author :
Matsunaka, T. ; Yamashita, S.
Author_Institution :
Aloka Co. Ltd., Tokyo, Japan
Abstract :
A miniature Doppler probe using a unidirectional leaky-wave surface acoustic wave transducer is presented for application to the measurement of blood flow in a living body. The interdigital electrodes in four pairs were fabricated on piezoelectric materials with dimensions of 1.6 mm×2.2 mm. The transducer has a 5-MHz center frequency, a directivity of 13.5 dB to 18 dB, and an electroacoustic conversion efficiency of -27 dB. The utility of the probe was demonstrated in blood flow measurements. The probe eliminates the need for a stand-off incorporated with a conventional Doppler probe
Keywords :
Doppler effect; biomedical equipment; biomedical measurement; biomedical ultrasonics; flow measurement; flowmeters; haemodynamics; piezoelectric transducers; surface acoustic wave devices; ultrasonic transducers; 5 MHz; electroacoustic conversion efficiency; interdigital electrodes; leaky-wave; living body; measurement of blood flow; miniature Doppler probe; piezoelectric materials; unidirectional SAW transducer; Acoustic measurements; Acoustic transducers; Acoustic waves; Blood flow; Electrodes; Fluid flow measurement; Piezoelectric materials; Piezoelectric transducers; Probes; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.275911
