System and method for prevention of adhesion of marine organisms to a substrate contacting with seawater

Abstract

A system and a method for prevention of adhesion of marine organisms to a substrate contacted with seawater are provided. The system comprises a generator (120, 220) for producing an electrical signal (150) operating in desirable frequencies in which the marine organisms can be chased or killed, said generator (120, 220) having at least two output connectors (122, 124, 222, 224), means for oscillating and propagating the electrical signal (150) along a surface of the substrate, said means being adapted to make electrical connection with the at least two output connectors (122, 124, 222, 224) of the generator (120, 220) and being submerged in seawater, and an electric power source (110, 210) connected to the generator (122, 124, 222, 224) for applying a selected voltage to the generator (122, 124, 222, 224) to produce the electrical signal (150).

Claims

1. A system for prevention of adhesion of marine organisms to a substrate contacting with seawater, comprising: a generator for producing an electrical signal operating with frequencies which are able to chase or kill the marine organisms, said generator having a card console and at least two output connectors; a plurality of cards each operating with the card console, the plurality of cards including a trapping card to provide a distinct frequency, a spike card to provide a set of distinct frequencies, and a normal card to provide a frequency range for the electrical signal produced by the generator; a device for oscillating and propagating the electrical signal along a surface of the substrate, said device being adapted to make electrical connection with the at least two output connectors of the generator and being submerged in water; and an electric power source connected to the generator for applying a selected voltage to the generator to produce the electrical signal, wherein the device for oscillating and propagating the electrical signal comprises at least one pair of spaced cylindrical electrode antennas, the electrical signal oscillating and propagating through each of the spaced cylindrical electrode antennas along the surface of the substrate, thereby preventing adhesion of the marine organisms to the substrate contacting with seawater, and one of the spaced cylindrical electrode antennas in each of the at least one pair of spaced cylindrical electrode antennas has a single electrical connection, the single electrical connection being electrically connected with only one of the at least two output connectors of the generator and the other of the spaced cylindrical electrode antennas in each of the at least one pair of spaced cylindrical electrode antennas also has a single electrical connection, the single electrical connection being electrically connected with only one of another of the at least two output connectors of the generator.

2. The system as claimed in claim 1, wherein the generator comprises a plurality of transistors connected to the card console to produce the electrical signal having the frequencies in square wave form.

3. The system as claimed in claim 1, wherein the frequencies generated by the generator vary in the range of 5 kHz to 200 kHz.

4. The system as claimed in claim 3, wherein the frequencies are selected in the range of 5 kHz to 50 kHz.

5. The system as claimed in claim 1, wherein the at least one pair of spaced cylindrical electrode antennas is made of a material selected from metal, metal oxide, and graphite.

6. The system as claimed in claim 1, wherein the electric power source supplies to the generator a low voltage of 24V, 30V, 36V, 45V, or 48V.

7. The system as claimed in claim 1, wherein the distinct frequency is 10 kHz, the set of distinct frequencies is 5 kHz, 10 kHz, and 20 kHz, and the frequency range is 10 kHz to 20 kHz.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic view of a system for prevention of adhesion of marine organisms to a substrate contacting with seawater, which is constructed in accordance with a first embodiment of the invention.

(2) FIG. 2 is a schematic top view of a first variant of the means for oscillating and propagating the electrical signal as shown in FIG. 1, which is a linear array.

(3) FIG. 3 is a schematic side view of the variant of FIG. 2.

(4) FIG. 4 is a schematic view of a second variant of the means for oscillating and propagating the electrical signal as shown in FIG. 1, which is in the form of a matrix array.

(5) FIG. 5 is a schematic view of a system for prevention of adhesion of marine organisms to a substrate contacting with seawater, which is constructed in accordance with a second embodiment of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(6) While this invention is illustrated and described in preferred embodiments, the system for prevention of adhesion of marine organisms to a substrate contacting with seawater may be produced in many different configurations, sizes, forms and materials.

(7) Referring now to the drawings, FIG. 1 provides a system 100 constructed consistent with a first embodiment of the present invention. In this embodiment, the system 100 comprises a power supply unit 110, a generator 120 for producing electrical signals operating with desirable frequencies in square wave form, and means for oscillating and propagating the electrical signals, which means comprises two spaced electrode antennas 130, 140 submerged in water.

(8) The power supply unit 110 is electrically connected to the generator 120. DC (e.g. battery) and AC power supplies can be used in the power supply unit 110. Advantageously, the power supply unit 100 further comprises a rectifier for providing direct current pulse voltage. The power supply unit 110 preferably supplies to the generator a low voltage of 24V, 30V, 36V, 45V or 48V. It would be understood that the higher the voltage is, the stronger the strength outputted by the generator is.

(9) The generator 120 comprises a card console 126 and a plurality of transistors 128 connected to the card console 126 to produce the electrical signals. The generator 120 has two output connectors 122, 124 which are in electrical connection with the electrode antennas 130, 140, respectively. The card console 126 has a variety of ranges of frequency, which all fall into the scope of desirable frequencies. In this embodiment, the desirable frequencies are in the range of 5 kHz to 200 kHz, preferably in the range of 5 kHz to 50 kHz, particularly in the range of 10 kHz to 15 kHz, of 15 kHz to 20 kHz, or of 5 kH to 10 kHz to 20 kHz. For example, a spike card having a frequency at 5 kHz, 10 kHz and 20 kHz, a trapping card having a frequency at 10 kHz and a normal card having a frequency ranging from 10 kHz to 15 kHz can be used in the generator 120. The output current of the card console 126 depends on the voltage of the power supply applied to the generator 120. The system 100 consumes low voltage and low current.

(10) The electrode antennas 130, 140 are disposed to be submerged in seawater 160 in a spaced apart relation, and electrically connected to the respective output connectors 122, 124 of the generator 120, allowing the electrical signals produced by the generator 120 to oscillate and propagate between the two electrode antennas 130, 140 via ions and molecules in water. Advantageously, the electrode antennas 130, 140 are spaced apart such that the electrical signals 150 operating with the frequencies in the range of 5 kHz to 50 kHz, which oscillate and propagate between the two electrode antennas 130, 140 are strong sufficiently to repel, chase and kill any marine organisms. The electrical field with the frequencies ranging from 5 kHz to 200 kHz would penetrate and destroy the nervous systems, muscle control systems, sensing systems of marine organisms and planktons, thus providing the protection for the area between the two electrode antennas.

(11) The electrode antennas can be made of a metal material, such as silver, copper, iron, or metal oxide. Graphite is preferred for the electrode antennas because it has a low consumption rate in seawater and can be controlled not to produce chlorine gas in the system. Therefore, in this embodiment, the electrode antennas are made of graphite because of its inert characteristics in seawater.

(12) As discussed above, the generator 120 produces electrical signals within the range of 5 kHz to 200 kHz, which signals are continuously transmitted to the area defined by the two electrode antennas 130, 140, and then oscillating and propagating within this area. The strength of the electrical field in this area depends on the current outputted from the card console 126, the frequencies produced by the generator 120, the voltage of the power supply and the distance between the two electrode antennas 130, 140. For example, in the case that the voltage of the power supply is 48V, the input DC current of the power supply is 0.87 A, the input DC current of the card console is 4.5 A, the output DC current of the card console is 5.1 A, then the electrical field between the electrode antennas 130, 140 would be strong enough to chase and kill any living organisms in seawater. The two electrode antennas may be spaced apart to be, for example, within 1 m or even more, which depends on the strength of the electrical field, the water condition in use, and the actual installation of the system.

(13) FIGS. 2 to 4 illustrate first and second exemplary variants of the means for oscillating and propagating the electrical signal as shown in FIG. 1. In particular, these variants are formed in an array configuration.

(14) In FIGS. 2 and 3, the array configuration comprises a plurality of spaced electrode antennas 171, which is a linear array 170. The alternate antennas 171 in the linear array 170 are in parallel connection and then electrically connected to the respective output connectors 122, 124 of the generator 120, allowing the electrical signals produced by the generator 120 to oscillate and propagate among the antennas 171 in the array 170. As illustrated, the area where the electrical fields from the adjacent antennas 171 overlaps produces the stronger electrical signals.

(15) In FIG. 4, the array configuration also comprises a plurality of spaced electrode antennas 181, which is in the form of matrix array 180. The electrode antennas 181 at each side of this matrix array 180 are in parallel connection and then electrically connected to the respective output connectors 122, 124 of the generator 120, allowing the electrical signals produced by the generator 120 to oscillate and propagate among the antennas 181 in the array 180. Like the first array configuration above, the area where the electrical fields from the adjacent antennas 181 overlaps produces the stronger electrical signals.

(16) It would be appreciated that in operation, the adjacent electrode antennas in the array may be spaced apart from each other by a distance which is dependent on the strength of the electrical filed applied, the power supply and the water condition. Actual arrangement of the array configuration may be altered to suit the actual application conditions.

(17) Now referring to FIG. 5, there is illustrated a system 200 constructed consistent with a second embodiment of the present invention. In this embodiment, the system 200 comprises a power supply unit 210, a generator 220 for producing electrical signals operating with desirable frequencies, and means for oscillating and propagating the electrical signals, which means comprises a ferrite core antenna 230 and a coil 240 would around the ferrite core antenna 230 submerged in water.

(18) Like the first embodiment mentioned above, the power supply unit 210 is electrically connected to the generator 220. DC and AC power supplies can be used in the power supply unit 210. The power supply unit 100 may further comprise a rectifier for providing direct current pulse voltage. A low voltage of 24V, 30V, 36V, 45V or 48V is possible for the power supply unit 210.

(19) The generator 220 comprises a card console 226 and a plurality of transistors 228 connected to the card console 226 to produce the electrical signals. The generator 220 has two output connectors 222, 224 which are in electrical connection with respective ends of the coil 240. The card console 226 has a variety of ranges of frequency, which all fall into the scope of desirable frequencies. In this embodiment, the desirable frequencies are in the range of 5 kHz to 200 kHz, preferably in the range of 5 kHz to 30 kHz. The output current of the card console 226 depends on the voltage of the power supply applied to the generator 220.

(20) The ferrite core antenna 230 and the coil 240 are disposed within a housing 250, which are then submerged in seawater 260. The coil 240 has two ends, each of which is electrically connected to the respective output connector 222, 224 of the generator 220, allowing the current to flow therethrough so as to generate electromagnetic waves within the frequencies in the range of 5 kHz to 200 kHz. As shown in FIG. 5, the electromagnetic field 270 is then generated within the coil 240 and around the coil 240, which is able to repel, chase and kill any marine organisms. Any marine organism, which are subjected to the effects of the electromagnetic field generated, can detect electromagnetic wave or field in this range of frequencies, and can be repelled, chased away or killed. Thus, the protection for the area covered by the electromagnetic field 270 is provided.

(21) In addition to the ferrite core antenna, the antenna may be made of any other ferromagnetic material or a hollow non-metallic tube. The antenna can act as a magnet to generate the electromagnetic field when the current flows through the coil. The number of turns of the coil 240 is determined according to the current flow through the wire and according to the actual requirements.

(22) Like the generator 120 discussed above, the generator 220 produces electrical signals within the range of 5 kHz to 200 kHz, which signals are continuously transmitted through the ferrite core antenna 230 to oscillate and propagate electromagnetic signals generated by the electromagnetic field. Low voltage and low current are consumed in this system. The strength of the electromagnetic field depends on the current outputted from the card console 226, the frequencies produced by the generator 220, the voltage of the power supply and the size of the ferrite core antenna 230. For example, in the case that the voltage of the power supply is 48V, the input DC current of the power supply is 0.87 A, the input DC current of the power supply is 1.47 A, the input DC current of the card console is 13 A, and the output DC current of the card console is 4.8 A, then the electromagnetic field generated by the system 200 would be strong enough to chase and kill any living organisms in seawater.

(23) The method of the present invention for prevention of adhesion of marine organisms to a substrate contacting with seawater comprises the steps of providing a generator for producing an electrical signal operating with desirable frequencies which are able to chase or kill the marine organisms, said generator having at least two output connectors; providing means for oscillating and propagating the electrical signal, and disposing the means along a surface of the substrate to be submerged in water, said means being adapted to make electrical connection with the at least two output connectors of the generator; and connecting the generator to an electric power source for applying a selected voltage thereto in order to produce the electrical signal.

(24) Referring back to FIG. 1, the method of the preferred embodiment comprises providing at least two spaced electrode antennas 130, 140 between which the electrical signal oscillates and propagates, each of the electrode antennas being adapted to make electrical connection with the respective output connectors 122, 124 of the generator 120, wherein the generator 120 produces the electrical signal operating with frequencies in the range of 5 kHz to 200 kHz.

(25) Referring to FIG. 5, the method of the preferred embodiment comprises providing a ferrite core antenna 230, and a coil 240 wound around the ferrite core antenna 230 and having two ends adapted to make electrical connection with the respective output connectors 222, 224 of the generator 220, wherein the generator 220 produces the electrical signal operating with frequencies in the range of 5 kHz to 200 kHz.

(26) The invention thus provides a system and a method for prevention of adhesion of marine organisms to a substrate contacting with seawater which is very simple, relatively inexpensive and more environmentally sound without leaching toxins, and which provides an efficient antifouling result.

(27) While the embodiments described herein are intended as an exemplary wall lamp fixture, it will be appreciated by those skilled in the art that the present invention is not limited to the embodiments illustrated. Those skilled in the art will envision many other possible variations and modifications by means of the skilled person's common knowledge without departing from the scope of the invention, however, such variations and modifications should fall into the scope of this invention.