GB2156528A - Apparatus for counting fish in water - Google Patents
Apparatus for counting fish in water Download PDFInfo
- Publication number
- GB2156528A GB2156528A GB08507283A GB8507283A GB2156528A GB 2156528 A GB2156528 A GB 2156528A GB 08507283 A GB08507283 A GB 08507283A GB 8507283 A GB8507283 A GB 8507283A GB 2156528 A GB2156528 A GB 2156528A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fish
- array
- current values
- power supply
- zone
- 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.)
- Granted
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/02—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current
- G01V3/04—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current using dc
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
A fish counter (10) comprises an electrode array (11) having electrodes (E1, E11 and E12) connectable via transistor switches (S1, S11, S12) to a D.C. power supply (12). The switches are operated by signals on line (13) emanating from a microprocessor (14) such that first and second pairs of electrodes of array (11) are alternately energised and the current flowing between the electrodes of an energised pair is sensed by sensor (15) and fed into the microprocessor (14) via an analogue digital converter (16). The microprocessor (14) is arranged to store respective quiescent current values which occur in the absence of a fish within the zone of influence of the array (11), is arranged to evaluate running averages of the sensed current values in the possible presence of a fish and compares the difference between the running averages and the quiescent current values with a predetermined or preset value in order to provide measures indicative of the presence or absence of a fish and this gives rise to a count signal being issued by the microprocessor (14) to a meter (18). <IMAGE>
Description
SPECIFICATION
Apparatus for counting fish in water
This invention relates to apparatus for counting fish in water.
According to the present invention there is provided apparatus for counting fish in water, comprising an electrode array having three parallel elongate electrodes capable of installation in water across an anticipated fish movement path, regulated power supply means for electrically energising said array, controllable switch means connected between said power supply means and said array, drive means connected to said switch means for intermittent selective actuation of said controllable switch means said drive means being arranged repetitively to connect sequentially first and second pairs of said three electrodes to said power supply means, current sensing means for sensing electrical current flowing between said array and said power supply means, and data handling means connected to said current sensing means, said data handling means comprising first means for storing respective quiescent current values representative of the sensed current flowing between the power supply means and the first and second electrode pairs in the absence of a fish within the zone of influence of the array, second means for evaluating respective running averages of the sensed current values flowing between the power supply means and the first and second electrode pairs in the possible presence of a fish within the zone of influence of the array, third means for comparing the difference between said respective running averages and said respective quiescent current values with preset values to provide respective measures indicative of the presence or absence of a fish within the zone of influence of the array.
Preferably said data handling means further comprises an accumulator means for storing a plurality of said respective measures, for comparing the measures accumulated over a time interval with preset data, and for issuing a count signal designatory of the presence of a single fish having traversed the anticipated fish movement path when said preset data is exceeded.
Preferably said data handling means further comprises fourth means of discriminating the direction of movement of a fish having traversed the fish movement path.
Preferably said data handling means further comprises fifth means for evaluating respective quiescent current values consequential to said accumulative means issuing a said count signal.
Preferably said data handling means further comprises sixth means for evaluating respective quiescent current values at predetermined time intervals provided no fish is detected within the counting zone.
An embodiment of the present invention will now be described by way of example with reference to the accompanying drawings in which:
Figure 1 schematically illustrates the apparatus; and
Figure 2 illustrates alternative installation arrangements of the electrode array of Fig. 1.
The apparatus 10 illustrated in Fig. 1 comprises an electrode array 11 having three parallel elongate electrodes El 1, El and Eel 2 respectively connected to a regulated 5 volt
D.C. power supply 1 2 (incorporating a DC/DC isolator converter and a regulator) by means of controllable switches S11, S1 and S12.
The switches are driven by signals emanating on line 1 3 from a microprocessor 14 (which conveniently is a Rockwell RM65-1 000E device) such that a first electrode pair El 1 and
El is connected across the power supply 1 2 and subsequently a second electrode pair, namely El 2 and El, is connected across the power supply 1 2. The microprocessor 14 is arranged to provide drive signals on line 1 3 at a rate of about 50 per second and the resultant currents Ii and 12 which, in time interlaced fashion, flow between the array 11 and the power supply 1 2 are sensed by a current sensor 1 5 and analogue-to-digital converted by converter 1 6 to provide digital data signals to the microprocessor 14.
Microprocessor 14 is arranged to receive the data from sensor 1 5 and to store respective 11, 12, current values in the absence of a fish within the zone of influence of the array
11, such current values being quiescent current values. During the possible presence of a fish within the zone of influence of the array 11 the microprocessor is arranged to receive the respective 11. 12, current values and to evaluate respective running average thereof.
Furthermore, microprocessor 1 4 is arranged to compare the difference between the respective running averages and the respective quiescent current values with preset values or sensitivity settings as entered into microprocessor 1 4 by means of a sensitivity setting switch 1 7. This comparison provides respective measures indicative of the presence or absence of a fish within the zone of influence of the array 11 at the instant in time pertaining to the sensed 11, 12 current values. Accumulator means within the microprocessor 14 accumulates or stores such respective measures and effects a comparison of the measures accumulated over a time interval with preset data which, for example, may be evaluated on a statistical basis and is provided for the purpose of mitigating erroneous readings from spurious signals.When the preset data is exceeded the accumulator means provides a count signal designatory of the presence of a single fish having traversed the zone of influence of the array 11. This count signal is output by microprocessor 14 and is accumulated in a totalising meter 1 8.
On completion of a count signal being issued to meter 18, the microprocessor 14, which continues to receive current data from sensor 15, treats the data as an update of the quiescent current values and accordingly evaluates a running average of the quiescent current values. Additionally at preset time intervals the microprocessor evaluates respective quiescent current values.
It will be understood that the quiescent current values require to be updated from time to time to take account of temperature changes in the water and also to take account of variation in the organic matter content of the water. The presence of a fish in the zone of influence of the array 11 effectively reduces the electrical resistance RW1, RW2, of the water between the two electrodes; the reduction depends upon the physical size af the fish, the electrode spacing, the water conductivity and the fish position in the water as it swims over the electrodes.Sensitivity setting switch 1 7 is therefore manually variable to provide different settings of a scale
1-15 inclusive so that at setting 1 only relatively large fish give rise to a count signal from microprocessor 14 whilst at setting 1 5 only extremely small fish fail to provide a count signal.
The time interval over which the accumulator means stores the respective measures may be preset, for example, at one or two seconds so that a count signal is made only if a fish leaves the zone of influence of the array 11 within the set time period and provided that the fish has left the zone at the end opposite that where it entered. A fish withdrawal from the zone is detected by the microprocessor 14 and causes the accumulated data to be reset to zero, the quiescent currents again measured and counting continued in a fresh duty cycle.
It will be observed that the apparatus 10 in
Fig. 1 is multi-channel, only one channel being illustrated in detail in the interests of clarity.
The electrode array 11 which is installed in water across the anticipated fish movement path is preferably located in any one of the four installation patterns illustrated in Fig. 2.
Thus Fig. 2A is a cross-section of a tunnel 20 through which the water flows and the electrode array 11 is mounted peripherally on the wall of the tunnel; Fig. 2B is a cross-section through an open channel 21 on the floor of which the array 11 is mounted; Fig. 2C illustrates a Crump Weir 22 formed on a river bed and the array 11 is located on the downstream face of the Weir 22; and Fig. 2D illustrates a round-crested Weir 23 formed on a river bed, the array 11 being located on the downstream face of Weir 23.
Claims (6)
1. Apparatus for counting fish in water, comprising an electrode array having three parallel elongate electrodes capable of installation in water across an anticipated fish movement path, regulated power supply means for electrically energising said array, controllable switch means connected between said power supply means and said array, drive means connected to said switch means for intermittent selective actuation of said controllable switch means said drive means being arranged repetitively to connect sequentially first and second pairs of said three electrodes to said power supply means, current sensing means for sensing electrical current flowing between said array and said power supply means, and data handling means connected to said current sensing means, said data handling means comprising first means for storing respective quiescent current values representative of the sensed current flowing between the power supply means and the first and second electrode pairs in the absence of a fish within zone of influence of the array, second means for evaluating respective running averages of the sensed current values flowing between the power supply means and the first and second electrode pairs in the possible presence of a fish within the zone of influence of the array, third means for comparing the difference between said respective running averages and said respective quiescent current values with preset values to provide respective measures indicative of the presence or absence of a fish within the zone of influence of the array.
2. Apparatus as claimed in claim 1, wherein said data handling means further comprises an accumulator means for storing a plurality of said respective measures, for comparing the measures accumulated over a time interval with preset data, and for issuing a count signal designatory of the presence of a single fish having traversed the anticipated fish movement path when said preset data is exceeded.
3. Apparatus as claimed in either preceding claim, wherein said data handling means further comprises fourth means for discriminating the direction of movement of a fish having traversed the fish movement path.
4. Apparatus as claimed in any preceding claim, wherein said data handling means further comprises fifth means for evaluating respective quiescent current values consequential to said accumulative means issuing a said count signal.
5. Apparatus as claimed in any preceding claim, wherein said data handling means further comprises sixth means for evaluting respective quiescent current values at predetermined time intervals provided no fish is detected within the counting zone.
6. Apparatus for counting fish in water and substantially as hereinbefore described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB848408014A GB8408014D0 (en) | 1984-03-28 | 1984-03-28 | Counting fish in water |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8507283D0 GB8507283D0 (en) | 1985-04-24 |
| GB2156528A true GB2156528A (en) | 1985-10-09 |
| GB2156528B GB2156528B (en) | 1987-03-18 |
Family
ID=10558800
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB848408014A Pending GB8408014D0 (en) | 1984-03-28 | 1984-03-28 | Counting fish in water |
| GB08507283A Expired GB2156528B (en) | 1984-03-28 | 1985-03-20 | Apparatus for counting fish in water |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB848408014A Pending GB8408014D0 (en) | 1984-03-28 | 1984-03-28 | Counting fish in water |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8408014D0 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2230611A (en) * | 1989-03-30 | 1990-10-24 | Cintex Ltd | Detecting foreign bodies in products |
| EP2479715A1 (en) * | 2011-01-24 | 2012-07-25 | Witteveen + Bos Raadgevende ingenieurs B.V. | System for counting and/or recognizing fish |
-
1984
- 1984-03-28 GB GB848408014A patent/GB8408014D0/en active Pending
-
1985
- 1985-03-20 GB GB08507283A patent/GB2156528B/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2230611A (en) * | 1989-03-30 | 1990-10-24 | Cintex Ltd | Detecting foreign bodies in products |
| GB2230611B (en) * | 1989-03-30 | 1993-02-03 | Cintex Ltd | Product monitoring |
| US5304927A (en) * | 1989-03-30 | 1994-04-19 | Cintex Limited | Method and apparatus for monitoring a series of products |
| EP2479715A1 (en) * | 2011-01-24 | 2012-07-25 | Witteveen + Bos Raadgevende ingenieurs B.V. | System for counting and/or recognizing fish |
| NL2006056C2 (en) * | 2011-01-24 | 2012-07-26 | Witteveen & Bos Raadgevende Ingenieurs B V | System for counting and/or recognizing fish. |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8507283D0 (en) | 1985-04-24 |
| GB2156528B (en) | 1987-03-18 |
| GB8408014D0 (en) | 1984-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20040320 |