Apparatus and method for transmitting and receiving ultrasonic waves having an acoustoelectric, ultrasonic transducer
First Claim
1. An apparatus for transmitting and receiving ultrasonic waves comprising:
- a transmitter for sending a first pair of ultrasonic waves to a sample, the first pair of ultrasonic waves being separated from one another and having substantially symmetric waveforms with respect to zero sound pressure;
an acoustoelectric, ultrasound transducer for receiving a second pair of ultrasonic waves affected by the sample, said acoustoelectric, ultrasonic transducer converting the second pair of ultrasonic waves into a pair of first electric signals accompanied by phonon-charge carrier interaction, each of the first electric signals including an acoustoelectric signal and a piezoelectric signal; and
a processing device for processing the pair of first electric signals so as to remove the piezoelectric signal and obtain the acoustoelectric signal.
1 Assignment
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Accused Products
Abstract
An apparatus for transmitting and receiving ultrasonic waves has a transmitter for sending a pair of ultrasonic waves to a sample. The pair of ultrasonic waves have substantially symmetric waveforms with respect to zero sound pressure. One of the ultrasonic wave is separated from the other ultrasonic wave. An acoustoelectric, ultrasonic transducer receives the pair of ultrasonic waves affected by the sample. The acoustoelectric, ultrasonic transducer converts the pair of ultrasonic waves 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 offsets the piezoelectric signals, thereby obtaining the acoustoelectric signals.
11 Citations
20 Claims
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1. An apparatus for transmitting and receiving ultrasonic waves comprising:
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a transmitter for sending a first pair of ultrasonic waves to a sample, the first pair of ultrasonic waves being separated from one another and having substantially symmetric waveforms with respect to zero sound pressure; an acoustoelectric, ultrasound transducer for receiving a second pair of ultrasonic waves affected by the sample, said acoustoelectric, ultrasonic transducer converting the second pair of ultrasonic waves into a pair of first electric signals accompanied by phonon-charge carrier interaction, each of the first electric signals including an acoustoelectric signal and a piezoelectric signal; and a processing device for processing the pair of first electric signals so as to remove the piezoelectric signal and obtain the acoustoelectric signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for transmitting and receiving ultrasonic waves comprising the steps of:
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sending a first pair of ultrasonic waves to a sample, the first pair of ultrasonic waves being separated from one another and having substantially symmetric waveforms with respect to zero sound pressure; receiving a second pair of ultrasonic waves affected by the sample; converting the second pair of ultrasonic waves received into a pair of first electric signals by an acoustoelectric, ultrasonic transducer accompanied by phonon-charge carrier interaction, each of the first electric signals including an acoustoelectric signal and a piezoelectric signal; and processing the pair of first electric signals so as to remove the piezoelectric signal and obtain the acoustoelectric signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification