Measuring and testing – Vibration – By mechanical waves
Patent
1978-09-12
1980-12-09
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
367 7, G01N 2900
Patent
active
042377374
ABSTRACT:
An ultrasonic imaging system is provided for forming an orthographic and a tomographic image of an object. The system comprises a receiving transducer array having a plurality of elements positioned at the lattice points of a parallelogram and a transmitting transducer array having a plurality of elements arranged in a straight line parallel to one side of the parallelogram at a period equivalent to the length of the side. A receiving beam former compensates for the delay time of the received signal for each element in the receiving transducer array and adds the compensated signals for all the elements. The receiving beam former comprises a quadrature demodulator which decomposes the output of a receiving transducer element into the inphase component and the quadrature component of a transmitting carrier signal. The beam former also includes means for delaying the components, means for performing the complex multiplication of the delayed components, means for adding the real parts of the output of the complex multiplication means for all channels, means for adding the imaginary parts of the output of the complex multiplication means for all channels, a pair of square circuits for providing the square of the real sum and the imaginary sum respectively, and an adder for adding the outputs of the square circuits. Further, means are provided for extracting the received beams in accordance with the timing of the transmitted beam and are provided for displaying the extracted received beams thereby forming an image.
REFERENCES:
patent: 3794964 (1974-02-01), Katakura
patent: 3918025 (1975-11-01), Koshikawa et al.
patent: 3919683 (1975-11-01), Itamura et al.
patent: 3953825 (1976-04-01), Kino et al.
"Acoustic Imaging", G. Wade, Plenum Press, pp. 170-181, 1976.
"Acoustical Holography", vol. 3, A. F. Metherell, Plenum Press, pp. 191-209, 1971.
Kreitman Stephen A.
Oki Electric Industry Co. Ltd.
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