Echo sounders

Details Echo sounders Echo sounders

1977-12-15

1979-01-29

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

G01S 968

Patent

active

041863712

ABSTRACT:
An echo sounder has conventional transducer means for transmitting and receiving pulses of energy and display means for providing a display indicative of the period between the transmission of a pulse of energy and the receipt of an echo pulse. The echo sounder includes suppressor means defining a variable alarm window during which period alone echo pulses are passed to an alarm device. In an embodiment designed for marine applications the display means comprises a rotor arm carrying a first light emitting device connected to the transducer means and a second light emitting device energised during the alarm window. A motor is provided for rotating the rotary arm which co-operates with a scale. An alarm device responds to each echo signal occurring during the variable alarm window.

REFERENCES:
patent: 2998591 (1961-08-01), Lovett
patent: 3407398 (1968-10-01), Stearn
patent: 3566348 (1971-02-01), Leyden et al.
patent: 3757285 (1973-09-01), Ferre
patent: 3793618 (1974-02-01), Plangger
patent: 3964012 (1976-06-01), Yamamoto et al.
patent: 4013991 (1977-03-01), Balcom

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