Fish detection apparatus

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

367116, G01S 970

Patent

active

041886089

ABSTRACT:
A seabed referenced fish detection system for detecting aquatic animals within a predetermined zone relative to the bottom of a body of water. Preferably, fish are detected within a predetermined zone contiguous with the bottom without the need for range switching to accommodate changes in depth. A pair of ultrasonic pulses are transmitted, preferably of different frequencies, and separated by a predetermined time delay. The bottom echo from the first ultrasonic pulse initiates a gate interval during which echoes from the second ultrasonic pulse are detectable. When the time delay and the gate interval are equal, the gate interval terminates immediately before the reception of the second bottom echo, so that only echoes from above the bottom, e.g., fish echoes, can trigger an audible output signal. Since fish detection events are un-ambiguously indicated by an audible signal, the need for a graphic recorder or C.R.T. to distinguish and interpret fish and bottom echoes is eliminated.

REFERENCES:
patent: 2721987 (1955-10-01), Richard, Jr.
patent: 3417369 (1968-12-01), Richard
patent: 3706068 (1972-12-01), Bradshaw et al.
patent: 3793618 (1974-02-01), Plangger

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Fish detection apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fish detection apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fish detection apparatus will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1857266

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.