Communications – electrical: acoustic wave systems and devices – Receiver circuitry
Patent
1978-06-07
1980-04-29
Ciarlante, Anthony V.
Communications, electrical: acoustic wave systems and devices
Receiver circuitry
73626, 367138, G01S 966, G01N 2900
Patent
active
042008581
ABSTRACT:
This specification discloses an apparatus for scanning acoustic waves in accordance with the movement of a presumed axis moving on a certain surface (plane or curved). This apparatus has a multiplicity of acoustic transducer elements arrayed in the direction of movement of the presumed axis (scanning direction). The multiple acoustic transducer elements are grouped into a plurality of sets. At least two of the plurality of sets are associated with, namely, transmit or receive, a predetermined number of wave fronts overlapping one another within a predetermined region of the presumed axis and having their centers of curvature outside the axis as it moves. Thus, there is obtained an effect equivalent to that achieved by throwing thin acoustic beam along the presumed axis or by detecting the acoustic wave at each point on the axis preferentially from the other portions outside of such axis.
REFERENCES:
patent: 1384029 (1921-07-01), Fessenden
patent: 3618006 (1971-11-01), Wright
patent: 3693415 (1972-09-01), Waittington
patent: 3820387 (1974-06-01), Grabendorfer et al.
patent: 3881466 (1975-05-01), Wilcox
patent: 3919683 (1975-11-01), Itamura et al.
patent: 3936791 (1976-02-01), Kossoff
patent: 4019169 (1977-04-01), Takamizawa
patent: 4117446 (1978-09-01), Alais
Canon Kabushiki Kaisha
Ciarlante Anthony V.
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