Echo sounders

Details Echo sounders Echo sounders

1977-12-15

1980-07-01

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367 13, 367114, 367901, G01S 968, G01S 766

Patent

active

042109701

ABSTRACT:
An echo sounder has a transducer for transmitting and receiving pulses of energy, a rotary arm display and a meter or digital display. The rotary arm is arranged to cause the transducer to transmit a pulse of energy on each occasion it passes a datum position. The motor of the rotary arm display may be switched off while simultaneously energizing an oscillator having an output frequency equal to that of the rotational speed of the motor prior to deenergization.

REFERENCES:
patent: 2599586 (1952-06-01), Ross
patent: 3123797 (1964-03-01), Ehrman
patent: 3373399 (1968-03-01), Dorr et al.
patent: 3427866 (1969-02-01), Weighart
patent: 3495208 (1970-02-01), Grada
patent: 3624596 (1971-11-01), Dickenson et al.
patent: 3747053 (1973-07-01), Austin

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