Parametric array Doppler sonar apparatus

Details Parametric array Doppler sonar apparatus Parametric array Doppler sonar apparatus

1980-03-24

1981-10-20

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Speed determination

367 92, 367150, G01S 1560

Patent

active

042964822

ABSTRACT:
Parametric array Doppler sonar apparatus includes an acoustic lens containing a flat disk-like central portion and an annular outer portion serving as a convergent lens. Multiple transducers are positioned between the lens and the focal plane so as to launch collimated acoustic beams in specified directions through the central portion of the lens and to receive reflected energy propagating principally through the annular portion of the lens.

REFERENCES:
patent: 3510833 (1970-05-01), Turner
patent: 3886487 (1975-05-01), Walsh et al.

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