GB1174037A - Method and Apparatus for Measuring the Fullness of Trawl-Nets - Google Patents
Method and Apparatus for Measuring the Fullness of Trawl-NetsInfo
- Publication number
- GB1174037A GB1174037A GB2975768A GB2975768A GB1174037A GB 1174037 A GB1174037 A GB 1174037A GB 2975768 A GB2975768 A GB 2975768A GB 2975768 A GB2975768 A GB 2975768A GB 1174037 A GB1174037 A GB 1174037A
- Authority
- GB
- United Kingdom
- Prior art keywords
- level
- net
- flow rate
- fish
- flowmeters
- 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
- 241000251468 Actinopterygii Species 0.000 abstract 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 3
- 238000013459 approach Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F17/00—Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K73/00—Drawn nets
- A01K73/02—Trawling nets
- A01K73/10—Determining the quantity of the catch, e.g. by the pull or drag on the lines
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Farming Of Fish And Shellfish (AREA)
- Measuring Volume Flow (AREA)
Abstract
1,174,037. Trawling. FRIED. KRUPP G.m.b.H. 21 June, 1968 [24 June, 1967], No. 29757/68. Heading A1A. [Also in Divisions Gl and G4] ' The degree of filling of a trawl net is indicated from a measure of the rate of flow of water at a specific point in its interior. The trawl net is provided with seven flow meters arranged down the centre of the net, 1, 3, 5, 7, Fig. 1, to sense axial water flow rate, and at the side of the net, 2, 4, 6, to sense water flow perpendicular to the side of the net. Turbine flowmeters, Fig 3 (not shown), may be used, the frequency or amplitude of whose output signal is indicative of flow rate. Alternatively the flowmeters may be d.c. generators, or differential pressure flowmeters, or the speed of a fan wheel may be transmitted mechanically by flexible shafts. As the fish in the net comes level with a central flow meter its output drops from a constant level indicative of the overall flow rate to zero as the fish cover it. Conversely as the level of fish approaches a side flowmeter its output increases from a low level to a maximum when the fish is level with it to a minimum when it is covered. The flowmeters are connected sequentially via switch 14 to a circuit sensitive to an intermediate voltage or frequency, such that when the signal from a flow meter is above this level a respective lamp (Li)-(L?), Fig. 4 (not shown) is lit and below this level the lamp is extinguished. To correct for changes of overall flow rate the outputs from meters 1-6 may be subtracted from that of meter 7 which senses overall flow rate.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB93167A DE1284682B (en) | 1967-06-24 | 1967-06-24 | Method and device for measuring the degree of filling of trawls |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1174037A true GB1174037A (en) | 1969-12-10 |
Family
ID=6986801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2975768A Expired GB1174037A (en) | 1967-06-24 | 1968-06-21 | Method and Apparatus for Measuring the Fullness of Trawl-Nets |
Country Status (5)
| Country | Link |
|---|---|
| DE (1) | DE1284682B (en) |
| DK (1) | DK122202B (en) |
| FR (1) | FR1570249A (en) |
| GB (1) | GB1174037A (en) |
| NL (1) | NL6808358A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008018801A3 (en) * | 2006-08-08 | 2008-04-03 | Henning Skjold-Larsen | Angle-based filing ratio indicator |
| CN106305639A (en) * | 2016-11-21 | 2017-01-11 | 上海海洋大学 | Automatic control system of floater tractor |
| CN109997805A (en) * | 2019-05-08 | 2019-07-12 | 中国水产科学研究院南海水产研究所 | A kind of Cod-ends of Trawl mesh metamorphosis sensor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO753403L (en) | 1975-10-08 | 1977-04-13 | Simrad As |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1186141B (en) * | 1963-02-21 | 1965-01-28 | Klein Schanzlin & Becker Ag | Device for pressure equalization for liquid-filled electric underwater motors |
-
1967
- 1967-06-24 DE DEB93167A patent/DE1284682B/en active Pending
-
1968
- 1968-06-14 NL NL6808358A patent/NL6808358A/xx unknown
- 1968-06-18 DK DK287268A patent/DK122202B/en unknown
- 1968-06-21 GB GB2975768A patent/GB1174037A/en not_active Expired
- 1968-06-24 FR FR1570249D patent/FR1570249A/fr not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008018801A3 (en) * | 2006-08-08 | 2008-04-03 | Henning Skjold-Larsen | Angle-based filing ratio indicator |
| CN106305639A (en) * | 2016-11-21 | 2017-01-11 | 上海海洋大学 | Automatic control system of floater tractor |
| CN109997805A (en) * | 2019-05-08 | 2019-07-12 | 中国水产科学研究院南海水产研究所 | A kind of Cod-ends of Trawl mesh metamorphosis sensor |
| CN109997805B (en) * | 2019-05-08 | 2021-09-21 | 中国水产科学研究院南海水产研究所 | Trawl cod end mesh form change sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1284682B (en) | 1968-12-05 |
| FR1570249A (en) | 1969-06-06 |
| NL6808358A (en) | 1968-12-27 |
| DK122202B (en) | 1972-02-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |