DE928743C - Device for measuring the setting of fishing nets - Google Patents

Device for measuring the setting of fishing nets

Info

Publication number
DE928743C
DE928743C DEA15589A DEA0015589A DE928743C DE 928743 C DE928743 C DE 928743C DE A15589 A DEA15589 A DE A15589A DE A0015589 A DEA0015589 A DE A0015589A DE 928743 C DE928743 C DE 928743C
Authority
DE
Germany
Prior art keywords
ship
setting
measuring
fishing nets
difference
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
Application number
DEA15589A
Other languages
German (de)
Inventor
Willi Dr Kunze
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Atlas Werke AG
Original Assignee
Atlas Werke AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Atlas Werke AG filed Critical Atlas Werke AG
Priority to DEA15589A priority Critical patent/DE928743C/en
Application granted granted Critical
Publication of DE928743C publication Critical patent/DE928743C/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • A01K73/025—Regulation of net depth

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)

Description

In der Fischerei ist die Beobachtung der Einstellung der Fischnetze von großer Bedeutung, insbesondere um den richtigen Zeitpunkt für das Einholen des Netzes zu bestimmen. Es ist bekannt, zur Beobachtung der Einstellung des Fischnetzes akustische Signalübertragungsverfahren zu verwenden. Die bisherigen Einrichtungen dieser Art arbeiten ausnahmslos nach dem Echolotverfahren, bei dem von dem Schiff aus Lotsignale nach demIn the fishery, observing the setting of the fishing nets is of great importance, especially to determine the right time to pull in the net. It is known, to use acoustic signal transmission methods to observe the setting of the fishing net. The previous facilities of this type work without exception according to the echo sounder method, in the case of the pilot signals from the ship after

ίο Netz hin ausgesandt und die zurückkehrenden Echos ihrer Richtung und Entfernung nach beobachtet werden. Da das Netz bzw. seine Scherbretter nur ein unsicheres Reflexionsobjekt darstellen, hat man an den Scherbrettern Antwortgeber angeordnet. Für die Beurteilung der Netzeinstellung ist es zwar nicht erforderlich, die Entfernungen der beiden Scherbretter getrennt zur Anzeige zu bringen, vielmehr genügt es, wenn nur die Differenz dieser Entfernungen angezeigt wird. Sowohl für die Beobachtung der einzelnen Entfernungen als auch der Entfernungsdifferenz ist es aber bei den bekannten Einrichtungen erforderlich, auf dem Schiff Echolotsender vorzusehen, und es müssen, wenn eine sichere Beobachtung gewährleistet sein soll, auch noch an den Scherbrettern Antwortgeber angeordnet sein.ίο network sent out and those returning Echoes can be observed according to their direction and distance. Because the net or its otter boards represent only an uncertain object of reflection, one has answerers on the otister boards arranged. To assess the network setting, it is not necessary to have the To display the distances of the two otter boards separately, rather it is sufficient if only the difference in these distances is displayed. Both for observing the individual Distances as well as the difference in distance, it is necessary with the known devices, echo sounder transmitters are to be provided on the ship and must be provided if safe observation is ensured should also be arranged on the otter boards answerers.

Der vorliegenden Erfindung liegt die Erkenntnis zugrunde, daß es zur Beobachtung der Entfernungsdifferenz nicht erforderlich ist, die einzelnen Entfernungen zu messen, sondern daß es möglich ist, diese Differenz unmittelbar durch Verwendung synchronisierter, von den Scherbrettern ausgehenderThe present invention is based on the knowledge that it is not necessary to observe the distance difference, the individual distances to measure, but that it is possible to use this difference directly more synchronized, more outgoing from the otter boards

Signale der Beobachtung zugänglich zu machen. Das Wesen der Erfindung besteht demnach darin, daß die Aussendung der Schallwellen nicht vom Schiff, sondern nur von den Scherbrettern aus erfolgt und daß die an den Scherbrettern angeordneten Schallsender als Signalsender ausgebildet und so synchronisiert sind, daß sie gleichzeitig oder mit gewisser Phasenverschiebung Signale aussenden, die auf dem Schiff empfangenTo make signals available for observation. The essence of the invention is therefore that the sound waves are not emitted from the ship, but only from the otter boards takes place and that the sound transmitters arranged on the otter boards are designed as signal transmitters and are synchronized in such a way that they are simultaneously or with a certain phase shift Send out signals that are received on the ship

ίο werden und deren Zeit- oder Phasendifferenz als Maß für die Entfernungs- bzw. Tiefendifferenz benutzt wird. Auf diese Weise läßt sich eine sichere Messung auch ohne besondere Signalsender an Bord des Schiffes durchführen. Die Scherbrettsender können auf mechanischem Wege durch die Wasserströmung angetrieben werden, so daß eine elektrische Energiequelle zum Betrieb der Sender nicht erforderlich ist. An Bord des Schiffes ist nur eine Beobachtungsstation anzubringen, durch die die Signale der Scherbrettsender angepeilt und ihre Zeit- bzw. Phasendifferenz gemessen wird.ίο and their time or phase difference as Measure for the distance or depth difference is used. This way you can have a safe Carry out measurements without special signal transmitters on board the ship. The otter board transmitter can be driven mechanically by the water flow, so that a electrical energy source to operate the transmitter is not required. On board the ship is only to install an observation station, through which the signals of the otter board transmitter are targeted and their Time or phase difference is measured.

Claims (2)

Patentansprüche:Patent claims: i. Vorrichtung zur Messung der Einstellung von Fischnetzen durch Übertragung von Schallwellen zwischen Schiff und Netz, dadurch gekennzeichnet, daß die Aussendung der Schallwellen nicht vom Schiff, sondern nur von den Scherbrettern aus erfolgt und daß die an den Scherbrettern angeordneten Schallsender als Signalsender ausgebildet und so synchronisiert sind, daß sie gleichzeitig oder mit gewisser Phasenverschiebung Signale aussenden, die auf dem Schiff empfangen werden und deren Zeitoder Phasendifferenz als Maß für die Entfernungs- bzw. Tiefendifferenz benutzt wird.i. Device for measuring the setting of fishing nets by transmitting sound waves between ship and network, characterized in that the emission of sound waves not from the ship, but only from the otter boards and that the to the Sound transmitters arranged on eschereboards are designed as signal transmitters and are thus synchronized are that they send out signals at the same time or with a certain phase shift that on received by the ship and their time or phase difference as a measure of the distance or depth difference is used. 2. Vorrichtung nach Anspruch 1, gekennzeichnet durch die Verwendung mechanischer, durch die Wasserströmung angetriebener Sender.2. Device according to claim 1, characterized by the use of mechanical, Transmitter powered by the water current. Angezogene Druckschriften:
Deutsche Patentschrift Nr. 816 324.Referred publications:
German patent specification No. 816 324. 509 Sl3 6.5S509 Sl3 6.5S
DEA15589A 1952-04-24 1952-04-24 Device for measuring the setting of fishing nets Expired DE928743C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA15589A DE928743C (en) 1952-04-24 1952-04-24 Device for measuring the setting of fishing nets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA15589A DE928743C (en) 1952-04-24 1952-04-24 Device for measuring the setting of fishing nets

Publications (1)

Publication Number Publication Date
DE928743C true DE928743C (en) 1955-06-10

Family

ID=6923460

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA15589A Expired DE928743C (en) 1952-04-24 1952-04-24 Device for measuring the setting of fishing nets

Country Status (1)

Country Link
DE (1) DE928743C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE30841E (en) 1975-10-08 1982-01-05 Simrad As Mechanism for gauging the catch within a trawl net

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE816324C (en) * 1948-10-02 1951-10-08 Electroacustic Ges M B H Method of aligning fishing nets

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE816324C (en) * 1948-10-02 1951-10-08 Electroacustic Ges M B H Method of aligning fishing nets

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE30841E (en) 1975-10-08 1982-01-05 Simrad As Mechanism for gauging the catch within a trawl net

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