G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 29/00 (2006.01) G01H 11/06 (2006.01) G01H 17/00 (2006.01) G01N 17/02 (2006.01) G01N 29/04 (2006.01) H04R 17/00 (2006.01)
Patent
CA 2159756
An apparatus for transmitting and receiving ultrasonic waves has a transmitter for sending a pair of ultrasonic waves to a sample. The pair of the ultrasonic waves have substantially symmetric waveform with respect to zero sound pressure each other. One of the ultrasonic waves is separated from the other ultrasonic waves. An acoustoelectric, ultrasonic transducer receives the pair of ultrasonic waves affected by the sample. The acoustoelectric, ultrasonic transducer converts the pair of ultrasonic ways into a pair of electric signals accompanied by phonon-charge carrier interaction. Each of the electric signals includes an acoustoelectric signal insensitive to phase and a piezoelectric signal sensitive to phase. A processing device processes the pair of electric signals so as to remove the piezoelectric signal and obtain the acoustoelectric signal. The initial ultrasonic waves have opposite phase so that superimposition of the pair of electric signals by the processing device of offsets the piezoelectric signals, thereby obtAining the acoustoelectric signals.
Ishida Yoshihiko
Tani Makoto
Ishida Yoshihiko
Marks & Clerk
Ngk Insulators Ltd.
Tani Makoto
LandOfFree
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