Title :
A frequency sweep method for measuring the sound speed of a small sample using an ultrasonic standing wave
Author :
Yoshizawa, Masasumi ; Tagawa, Norio ; Moriya, Tadashi ; Yagi, Shin-ichi
Author_Institution :
Dept. of Electr. Eng., Tokyo Metropolitan Coll. of Technol., Japan
Abstract :
We intend to develop a method for imaging the speed of sound in biological tissue by scanning electrically. In this paper, we describe a method to obtain a lateral resolution for imaging the speed of sound in biological tissue. In this method, a thin fused quartz rod is used for a transmission line as well as a mode suppression filter. By using bundles of rods, electronic scanning is possible. To improve the mode suppression filter, we devised a method to eliminate unwanted signals caused by unwanted modes. The sound velocity is determined with a method based on the double-pulse interference method by sweeping the ultrasonic frequency. In this experiment the sound speed of a 0.10-mm-thick polyethylene plate was measured by using a fused quartz rod with a 0.5-mm radius. The error of the sound speed was less than 0.3%
Keywords :
acoustic wave interferometry; bioacoustics; biological techniques; biological tissues; polymers; ultrasonic velocity measurement; biological tissue; bundles of rods; double-pulse interference method; electronic scanning; frequency sweep method; lateral resolution; mode suppression filter; polyethylene plate; small sample; sound speed measurement; sound velocity; thin fused quartz rod; transmission line; ultrasonic frequency; ultrasonic standing wave; Acoustic imaging; Biological tissues; Filters; Frequency measurement; Image resolution; Interference; Polyethylene; Transmission lines; Ultrasonic variables measurement; Velocity measurement;
Conference_Titel :
Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE
Conference_Location :
Sendai
Print_ISBN :
0-7803-4095-7
DOI :
10.1109/ULTSYM.1998.765043
