GB1309902A - Fish-finding apparatus - Google Patents
Fish-finding apparatusInfo
- Publication number
- GB1309902A GB1309902A GB1309902DA GB1309902A GB 1309902 A GB1309902 A GB 1309902A GB 1309902D A GB1309902D A GB 1309902DA GB 1309902 A GB1309902 A GB 1309902A
- Authority
- GB
- United Kingdom
- Prior art keywords
- echoes
- fish
- transducer
- frequency
- polarity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/87—Combinations of sonar systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/96—Sonar systems specially adapted for specific applications for locating fish
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
1309902 Echo sounders NATIONAL RESEARCH DEVELOPMENT CORP 10 June 1970 [28 March 1969] 16540/69 Heading H4D In a fish-finding sonar "unsymmetrical" waves, i.e. waves the two halves of each cycle of which have different forms, are transmitted and the receiver includes means for determining the polarity of echoes, Unlike echoes from rigid solid objects, echoes from fish exhibit reversal of polarity. In an embodiment a transducer 3 emits pulses on a carrier frequency f and a transducer 6, on frequency f/2. The outputs of transducers 7, 8 are equalized and the composite signal from amplifier 11 is applied in parallel to Schmitt triggers 12, 13 set to levels +V, -V, see also, Fig. 2 (not shown), which are connected respectively to the normal and resetting inputs of a counter 15; the counter produces an output only for fish echoes. A single transmit-receive transducer may be employed. Frequency f is suitably 500 kHz.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1654069 | 1969-03-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1309902A true GB1309902A (en) | 1973-03-14 |
Family
ID=10079153
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1309902D Expired GB1309902A (en) | 1969-03-28 | 1969-03-28 | Fish-finding apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1309902A (en) |
-
1969
- 1969-03-28 GB GB1309902D patent/GB1309902A/en not_active Expired
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1133519A (en) | Material tester | |
GB1357329A (en) | Detection apparatus | |
FR1605482A (en) | Identification or attenuation multiple reflections in - seismic wave records | |
GB1098927A (en) | A new or improved blind aid | |
ES395171A1 (en) | Ultrasonic visualization | |
GB1371306A (en) | Flowmeter apparatus | |
ES267682A1 (en) | Echo sounding | |
ES426809A1 (en) | Acoustic log | |
GB1092531A (en) | Liquid presence detector | |
GB943591A (en) | Target simulator for acoustic echo repeating system | |
GB1180978A (en) | Fluid Velocity Measuring System. | |
GB1325629A (en) | Signal processor | |
GB1285175A (en) | Improvements in or relating to apparatus for measuring the flow velocity of fluids | |
GB1254728A (en) | Method and system for determining reflectivity of the ocean bottom | |
GB1309902A (en) | Fish-finding apparatus | |
GB699796A (en) | Improvements in or relating to the detection of cracks in engineering components | |
GB1300121A (en) | Apparatus for echo sound location, particulary for sea fishing | |
GB1162428A (en) | Improvements in or relating to Apparatuses for Digital Measurement of Distances by Means of Ultrasonic Pulses | |
GB692001A (en) | Improvements in or relating to ultrasonic inspecting devices | |
GB1398758A (en) | Ultrasonic detector | |
GB1121767A (en) | Apparatus for thickness measurement | |
JPS626540Y2 (en) | ||
GB1347285A (en) | Electroacoustic systems | |
US3810079A (en) | Propagation loss measuring device | |
ES313791A1 (en) | Echo-sounding apparatus for examining strata below the sea-bed with variable gain means responsive to sea-bed echoes |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |