WO1998058276A1 - Electrical polarisation distribution of a vessel - Google Patents
Electrical polarisation distribution of a vessel Download PDFInfo
- Publication number
- WO1998058276A1 WO1998058276A1 PCT/GB1998/001750 GB9801750W WO9858276A1 WO 1998058276 A1 WO1998058276 A1 WO 1998058276A1 GB 9801750 W GB9801750 W GB 9801750W WO 9858276 A1 WO9858276 A1 WO 9858276A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensors
- vessel
- electric
- field
- magnetic field
- Prior art date
Links
- 238000009826 distribution Methods 0.000 title claims abstract description 47
- 230000005291 magnetic effect Effects 0.000 claims abstract description 101
- 230000005684 electric field Effects 0.000 claims abstract description 76
- 238000005259 measurement Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000005260 corrosion Methods 0.000 claims abstract description 15
- 230000007797 corrosion Effects 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 description 14
- 230000005294 ferromagnetic effect Effects 0.000 description 9
- 239000013535 sea water Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/088—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices operating with electric fields
-
- 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
Definitions
- the present invention in its various aspects relates to measurements of electric field, and
- a known transportable magnetic range is that
- the Transmag system is its ability to create a computer magnetic model of a ship.
- Magnetic modelling has reduced the number of sensors necessary from dozens in some
- ⁇ 0 is the magnetic permeability of free space
- D is a matrix which contains the vector
- the propulsor is usually of
- CCM corrosion related magnetic
- Figure 1 shows the two fields from 1 to 100m from the source.
- Figure 2 shows the two fields from 1 to 100m from the source.
- the ferromagnetic field is much larger but, far enough away (in this case 200m) the CRM
- the present invention relates to apparatus for determining an electric
- processor means positioned in use underwater under the vessel, and processor means operative to process
- the plurality of sensors are preferably arranged in a row, for example on the sea- or
- the apparatus can be part of an electromagnetic
- a corrosion related magnetic (CRM) field is preferably determined from the electric
- the present invention also relates to a corresponding method of
- the present invention relates to apparatus for determining an electric
- polarisation distribution of a vessel including a plurality of electric potential sensors which are positioned in use underwater under the vessel, and processor means operative to
- the plurality of sensors are preferably arranged in a row, for example on the
- the apparatus can be part of an
- each magnetic field sensors carriers an electric potential sensor.
- a corrosion related magnetic field is preferably determined from the electric polarisation distribution deduced for the vessel.
- the present invention also relates to a corresponding method of
- polarisation distribution determination from electric potential measurements.
- corrosion related magnetic field is deduced from the polarisation distribution.
- potential sensors are inherently
- Electric potential sensors are
- Electric potential sensors are typically
- the present invention relates to apparatus for determination of the electric field of a vessel from its polarisation distribution.
- the present invention also relates to a
- the present invention relates to apparatus for determination of corrosion
- the present invention also relates to
- Figure 1 is a graph showing magnetic field components values against distance from a
- Figure 2 is a further graph showing magnetic field component values against distance from
- Figure 3 illustrates a first system including alternate magnetic field and electric field
- Figure 4 is a simplified perspective view of one magnetic field sensor (on a tripod mounting)
- FIG. 5 is a simplified perspective view of one electric field sensor (tripod mounting not
- Figure 6 illustrates a second system including magnetic field sensors and electric potential
- Figure 7 is a simplified perspective view of one combined magnetic field electric potential
- FIG. 8 illustrates the second system in more detail
- Figure 9 shows the electronics in the underwater junction box of the second system.
- the first ranging system 2 includes alternating magnetic field sensors
- the sensors 4, 6 are connected using cables (not shown) to control circuitry
- the magnetic field sensors 4 stand on concrete mattresses, or some other underwater structure.
- These electric field sensors 6 are also each mounted on a flat tripod.
- the sensors 4, 6 are connected to an underwater junction box (not shown) which is itself
- the sensors are
- each electric field sensor 6 consists of five electrodes 10, one at the
- each electric field sensor 6 includes a three axis
- the magnetic field sensors also collect data in a set of three
- the magnetic sensor hangs like a plumb-bob within a water-tight housing.
- the magnetic sensors operate by measuring the Earth's static magnetic field, from which
- Electric field is a vector so electric field sensors have to be aligned to the Earth's magnetic
- electric field sensors are rigidly aligned to the magnetic field sensors so
- the electric field sensors are not gimballed as they have to be in contact with the sea water and bearings in contact with sea water would soon corrode and cease to work.
- Electric fields in sea water can be measured using the opposing electrode pairs, the pairs
- electric field sensors 6 with merely four or five electrodes can be used with appropriate sensor geometry.
- the four electrodes 10 at the base provide the measured x and y components of the field, the z component being obtained from the sum of these four electrodes and the difference with
- E (l/- 0 ).D.p_
- E the field
- p_ polarisation
- - 0 the permittivity of free space
- D is a matrix
- p. is a matrix having 144 elements
- E has
- the air conductivity is
- sea bed conductivity is typically an order of magnitude
- ⁇ conductivity (a scalar) and E is electric field (a vector).
- the sea bed and sea surface must be considered. Above the sea surface, the current density
- the sea bed has a
- the air image also has a reflection in the sea bed.
- the sea bed image also has a
- ⁇ o is the magnetic permeability of free space
- r is separation from the vessel
- p_ is
- the polarisation distribution p . is a matrix of 144 elements corresponding to the
- B J . can be calculated from Bm and BCRM as follows:
- the ferromagnetic field at specific positions BFP is predicted, if desired. Calculating B_FP magnetic field distribution is useful as this enables the ampere-turn setting
- corrosion related magnetic CRM component B CRM of the magnetic field is relatively more significant.
- B CRM is preferably a matrix consisting of 14043 elements, p_ being a matrix with 144
- a second system 16 consists of five magnetic field sensors 18 each mounted on a flat
- An electrical potential sensor 22 is mounted on top of each magnetic field
- Each electric potential sensor 22 has no alignment requirement so is simply fixed at the top
- system 16 consists of five magnetic field sensors 18 on each of which is mounted a
- the electric potential sensors 22 are each
- the junction box is connected via an output
- the underwater junction box 24 has five input ports, denoted Vj to
- Each differential amplifier 30 is connected via an A to D convenor 32 and
- micro-processor 36 and opto-isolators 34 are connected via a bus 38. Power is provided to
- the amplifiers 30, A to D convertors 32 and opto-isolators 34 via DC to DC convenors 40.
- the data link is part of a cable 42 along
- the cable 42 can be several kilometres long and lies with other
- the cubicle 46 includes a power supply 50 to the
- p is a matrix having 144 elements, E has 14043 elements and D has 2022192
- V is the mathematical notation meaning gradient of, and V is electric potential.
- V a and V b are matrices each having 480 elements
- p is a polarisation distribution matrix having 144 elements
- Q a and Qb are matrices each of 69120 elements.
- Potential sensors are typically separated by approximately 6 metres (depending on sea
- the electric field noise is approximately 6 nano-volts per metre. This compares
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Electromagnetism (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Geophysics And Detection Of Objects (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/242,507 US6512356B1 (en) | 1997-06-16 | 1998-02-16 | Apparatus and method for determining electrical polarization of distribution of a vessel |
AU82219/98A AU742465B2 (en) | 1997-06-16 | 1998-06-16 | Electrical polarisation distribution of a vessel |
EP98932262A EP0919001A1 (en) | 1997-06-16 | 1998-06-16 | Electrical polarisation distribution of a vessel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9712521.5 | 1997-06-16 | ||
GB9712521A GB2328026B (en) | 1997-06-16 | 1997-06-16 | Electrical polarisation distribution of a vessel |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998058276A1 true WO1998058276A1 (en) | 1998-12-23 |
Family
ID=10814247
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1998/001750 WO1998058276A1 (en) | 1997-06-16 | 1998-06-16 | Electrical polarisation distribution of a vessel |
Country Status (5)
Country | Link |
---|---|
US (1) | US6512356B1 (en) |
EP (1) | EP0919001A1 (en) |
AU (1) | AU742465B2 (en) |
GB (1) | GB2328026B (en) |
WO (1) | WO1998058276A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003104844A1 (en) | 2002-06-11 | 2003-12-18 | The Regents Of The University Of California | Method and system for seafloor geological survey using vertical electric field measurement |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2003285949A1 (en) * | 2002-10-22 | 2004-05-13 | Isys Technologies | Non-peripherals processing control module having improved heat dissipating properties |
CN1729734B (en) * | 2002-10-22 | 2011-01-05 | 贾森·A·沙利文 | Systems and methods for providing a dynamically modular processing unit |
AU2003284329A1 (en) | 2002-10-22 | 2004-05-13 | Isys Technologies | Robust customizable computer processing system |
EP1636613A4 (en) * | 2003-06-26 | 2006-12-27 | Exxonmobil Upstream Res Co | Method for removing air wave effect from offshore frequency domain controlled-source electromagnetic data |
FR2896044B1 (en) * | 2006-01-09 | 2008-10-31 | Univ Bretagne Occidentale Etab | GEOPHYSIC MEASURING DEVICE FOR EXPLORING NATURAL SOIL RESOURCES IN AQUATIC FIELD. |
US7203599B1 (en) * | 2006-01-30 | 2007-04-10 | Kjt Enterprises, Inc. | Method for acquiring transient electromagnetic survey data |
US10082546B2 (en) * | 2006-12-11 | 2018-09-25 | Quasar Federal Systems | Compact underwater electromagnetic measurement system using magnetic sensors and electrical sensors having capacitive electrodes |
US7990724B2 (en) | 2006-12-19 | 2011-08-02 | Juhasz Paul R | Mobile motherboard |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3946354A (en) * | 1950-12-08 | 1976-03-23 | The United States Of America As Represented By The Secretary Of The Navy | Underwater electrical potential detection system |
DE4018312A1 (en) * | 1990-06-08 | 1991-12-12 | Dmt Marinetechnik Gmbh | Locating torpedo passing under or by moving target ship - involves detection and computer evaluation of alternating magnetic field emitted by torpedo using pulses on target ship |
US5206640A (en) * | 1991-02-01 | 1993-04-27 | Esko Hirvonen | Surveillance system |
EP0621493A1 (en) * | 1990-11-20 | 1994-10-26 | Hughes Aircraft Company | Dipole moment detection and localization |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3329929A (en) * | 1965-05-07 | 1967-07-04 | Henry J Burnett | Method for underwater detection and system therefor |
FR1569563A (en) * | 1966-06-23 | 1969-06-06 | ||
US3641427A (en) * | 1969-09-24 | 1972-02-08 | Us Navy | Electric field sensor |
US4210869A (en) * | 1978-02-06 | 1980-07-01 | Mobil Oil Corporation | Rotating telluric field measurements |
JPH0411404A (en) | 1990-04-27 | 1992-01-16 | Seiko Epson Corp | Etching processing method for at-cut crystal vibration chip and at-cut crystal vibration chip |
JP2940107B2 (en) * | 1990-08-31 | 1999-08-25 | 株式会社島津製作所 | How to demagnetize hull magnetism |
US5327089A (en) * | 1992-09-30 | 1994-07-05 | Raytheon Company | Portable assembly for supporting magnetic and electrical sensors |
JP2729292B2 (en) * | 1995-08-15 | 1998-03-18 | 防衛庁技術研究本部長 | Measurement method of underwater potential difference distribution in submerged sea surface of ship |
US5770945A (en) * | 1996-06-26 | 1998-06-23 | The Regents Of The University Of California | Seafloor magnetotelluric system and method for oil exploration |
-
1997
- 1997-06-16 GB GB9712521A patent/GB2328026B/en not_active Expired - Lifetime
-
1998
- 1998-02-16 US US09/242,507 patent/US6512356B1/en not_active Expired - Lifetime
- 1998-06-16 AU AU82219/98A patent/AU742465B2/en not_active Expired
- 1998-06-16 WO PCT/GB1998/001750 patent/WO1998058276A1/en not_active Application Discontinuation
- 1998-06-16 EP EP98932262A patent/EP0919001A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3946354A (en) * | 1950-12-08 | 1976-03-23 | The United States Of America As Represented By The Secretary Of The Navy | Underwater electrical potential detection system |
DE4018312A1 (en) * | 1990-06-08 | 1991-12-12 | Dmt Marinetechnik Gmbh | Locating torpedo passing under or by moving target ship - involves detection and computer evaluation of alternating magnetic field emitted by torpedo using pulses on target ship |
EP0621493A1 (en) * | 1990-11-20 | 1994-10-26 | Hughes Aircraft Company | Dipole moment detection and localization |
US5206640A (en) * | 1991-02-01 | 1993-04-27 | Esko Hirvonen | Surveillance system |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003104844A1 (en) | 2002-06-11 | 2003-12-18 | The Regents Of The University Of California | Method and system for seafloor geological survey using vertical electric field measurement |
EP1512033A1 (en) * | 2002-06-11 | 2005-03-09 | The Regents of the University of California | Method and system for seafloor geological survey using vertical electric field measurement |
EP1512033A4 (en) * | 2002-06-11 | 2011-05-11 | Univ California | Method and system for seafloor geological survey using vertical electric field measurement |
Also Published As
Publication number | Publication date |
---|---|
AU742465B2 (en) | 2002-01-03 |
GB2328026A (en) | 1999-02-10 |
US6512356B1 (en) | 2003-01-28 |
EP0919001A1 (en) | 1999-06-02 |
GB2328026B (en) | 2002-01-30 |
GB9712521D0 (en) | 1997-08-20 |
AU8221998A (en) | 1999-01-04 |
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