Communications – electrical: acoustic wave systems and devices – Acoustic image conversion – With memory means
Patent
1981-03-17
1983-09-06
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Acoustic image conversion
With memory means
367 88, G01S 1589
Patent
active
044033117
ABSTRACT:
An acoustic imaging system enabling images in two dimensions to be obtained. The system contains an array formed by M transmitter transducers E.sub.1, E.sub.2, . . . E.sub.M, supplying separable coded signals of the same frequency and a reception array with at least one line of hydrophones, H.sub.1, H.sub.2, . . . H.sub.N. The signals such as h.sub.i received by each of the hydrophones are applied to processing circuits such as D.sub.ik supplying signals x.sub.ik and y.sub.ik, which are multiplexed in circuits MX and MY in a given order, placed on a carrier and applied to an analog Fourier transform device with filters dispersive to acoustic waves. After detection, the system supplies a line of images.
REFERENCES:
patent: 3680105 (1972-07-01), Goldstone
patent: 3935439 (1976-01-01), Buss et al.
patent: 4049958 (1977-09-01), Hartmann
patent: 4119940 (1978-10-01), Keating et al.
patent: 4167737 (1979-09-01), Freedman
Jack et al., Electronics Letters, vol. 13, No. 3, pp. 65-66, Feb. 1977.
Grant et al., Ultrasonics Symposium Proc., 1977, pp. 957-960.
Jack et al., 1978 Ultrasonics Symposium Proc., Feb. 1978, pp. 533-537.
"Thomson-CSF"
Farley Richard A.
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