Measuring and testing – Vibration – By mechanical waves
Patent
1986-06-18
1987-10-20
Ciarlante, Anthony V.
Measuring and testing
Vibration
By mechanical waves
73626, 128660, G01N 2904
Patent
active
047005718
ABSTRACT:
An ultrasonic imaging apparatus has an ultrasonic transducer comprising an array of ultrasonic transducer elements which are divided into a transmission group and a reception group in an array direction. The transmission group transmits ultrasonic beams. The reception group receives ultrasonic beams crossing those transmitted by transmission group. When beams are transmitted to an object and reflected from the object are received, the velocity of the sound propagating through the object is measured. The voltage of drive pulses and that of echo pulses are detected, and the voltage dependency parameter of the drive pulses is calculated from the detected voltages. After each cycle of beam transmission/reception, the active positions of the transmission group and reception group are moved in the lengthwise direction of the array of transducer elements. Then, another cycle of beam transmission/reception is carried out, thereby detecting the voltage of drive pulses and that of echo pulses, and calculating the voltage dependency parameter of the drive pulses. Nonlinear parameters are calculated from the velocities of sound and voltage dependency parameters, which have been obtained by repeating the beam transmission/reception cycle. The nonlinear parameters and sound velocities are displayed.
REFERENCES:
patent: 4234940 (1980-11-01), Iinuma
patent: 4528854 (1985-09-01), Shimazaki
patent: 4542653 (1985-09-01), Liu
patent: 4542746 (1985-09-01), Takamizawa
patent: 4550606 (1985-11-01), Drost
Ciarlante Anthony V.
Kabushiki Kaisha Toshiba
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