Communications – electrical: acoustic wave systems and devices – Echo systems – Parametric sonar
Patent
1980-05-19
1981-12-29
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Parametric sonar
367101, 367110, 367903, G01S 1502
Patent
active
043085997
ABSTRACT:
An echo sounder including a unit for transmitting, into a medium, acoustic signals at two slightly differing high frequencies and in the form of pulses, resulting in the creation of an acoustic signal in the medium at a low frequency equal to the difference between the two high frequencies, and a receiving unit including a receiving transducer for receiving echoes of acoustic signals at the difference frequency and a display device for recording the echo signals in accordance with their travel times, the display device having a signal input which is connected with the low frequency receiving transducer, is further provided with a second receiving transducer responsive to high signal frequencies for receiving echoes of acoustic signals at at least one of the two transmitting frequencies, and a member connecting the second receiving transducer to the signal input of the display device.
REFERENCES:
patent: 3786405 (1974-01-01), Chramiec et al.
patent: 3793618 (1974-02-01), Plangger
patent: 4139834 (1979-02-01), Matsui et al.
patent: 4216537 (1980-08-01), Delignieres
Brandt, "Beitrage zur Schallortung", vol. 1, p. 51 and FIG. 19, Oct. 1953.
Farley Richard A.
Fried. Krupp Gesellschaft mit beschranker Haftung
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