EP2162766A2 - Dispositif et procédé de cartographie d'éléments à l'origine de modifications locales du champ magnétique terrestre - Google Patents

Dispositif et procédé de cartographie d'éléments à l'origine de modifications locales du champ magnétique terrestre

Info

Publication number
EP2162766A2
EP2162766A2 EP08773268A EP08773268A EP2162766A2 EP 2162766 A2 EP2162766 A2 EP 2162766A2 EP 08773268 A EP08773268 A EP 08773268A EP 08773268 A EP08773268 A EP 08773268A EP 2162766 A2 EP2162766 A2 EP 2162766A2
Authority
EP
European Patent Office
Prior art keywords
magnetic field
sensors
unit
earth
mapping
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.)
Withdrawn
Application number
EP08773268A
Other languages
German (de)
English (en)
Inventor
Volkmar Schultze
Sven Linzen
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.)
Institut fur Photonische Technologien EV
Original Assignee
Institut fur Photonische Technologien EV
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 Institut fur Photonische Technologien EV filed Critical Institut fur Photonische Technologien EV
Publication of EP2162766A2 publication Critical patent/EP2162766A2/fr
Withdrawn legal-status Critical Current

Links

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
    • G01V3/40—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for measuring magnetic field characteristics of the earth

Definitions

  • the invention relates to an apparatus and a method for mapping sources for the local change of the geomagnetic field.
  • magnétique field sensors that can be used, for example, to measure local changes in the earth's magnetic field, so far magnetometer or gradiometer are known.
  • DE 195 18 973 A1 discloses a method for locating ferromagnetic and / or other metallic objects, in particular underground objects, in which measurement signals are recorded along a measuring track by means of metal detector, wherein at least two arranged in different heights metal detection probes the measurement signals for direct depth determination of the object take up.
  • an apparatus for carrying out the method is described, in which the holder of the metal detection probes is executed double gimbal and the height difference between the metal detection probes is adjustable.
  • DE 195 04 841 A1 discloses a display device for a magnetometer, with which a metallic disruptive body located in the ground can be located by measuring the interference field strength. Analogously, the respectively measured field strength is displayed on the display instrument of the magnetometer, and further information, such as the respective sensitivity range or the computationally determined object depth, can be displayed in a digital display field.
  • a simple keyboard makes it possible to select a large number of different sensitivity levels and to enter the measured values to carry out the determination of the object depth of a structure in the earth.
  • the disadvantage of these two technical solutions is that they do not allow any gradient measurements and no precise determination of the size and depth of objects to be detected.
  • 2D magnetic field mapping with LTS-SQUID system include i.a. from the publication V. Schultze, A. Chwala, R. Stolz, M. Schulz, S. Linzen, H.-G. Meyer, and T. editor; A SQUID System for Geomagnetic Archaeometry, 6th Int. Conf. on Archaeological Prospection (Archeo2005), 14-17 Sept. 2005, Proc. pp. 245-248 known.
  • a SQUID measuring system is used in such a way that two LTS-SQUID magnetometers are carried or driven through the terrain to be examined.
  • the disadvantage of this 2D magnetic field mapping is that the depth of the structures found in the subsurface can not be clearly determined. Apart from their position, the only features obtained are their extent and magnetic field strength. In this case, however, a different strength measurement signal in different structures can be caused not only by different strength of the magnetic field source, but also by different depth. Likewise, a different lateral extent of the measured structures can be caused not only by actually different lateral extent of the magnetic field source, but also by different depths.
  • the object of the present invention is to provide a device and a method for mapping sources for the local change of the earth's magnetic field, which avoids the above-mentioned disadvantages of the prior art, in particular with respect to the 2D magnetic field mapping with S QUID systems the determination the concrete depth and size of the objects to be detected allows.
  • the object is solved by the characterizing features of the first and ninth patent claim. Advantageous embodiments are covered by the subordinate claims.
  • an apparatus for mapping sources for the local variation of the Earth's magnetic field comprising the following components:
  • gradient refers to the difference of the magnetic field at two different locations
  • base length refers to the distance between the centers of the two locations, between which the difference in the magnetic field is measured.
  • a measuring unit for the simultaneous determination of the location of the gradiometer above the measuring field to be mapped ⁇ gradiometer is a sensor for measuring the local gradient), consisting of a differential GPS unit (dGPS) with a GPS antenna for recording the position the moving carriage with the sensors used, a second fixed reference GPS antenna and a radio transmission of the reference station data to the moving measuring car, to increase the accuracy of the local location allocation of several meters (simple GPS) to a few centimeters (dGPS) and from an inertial unit , which determines the position of the measuring car.
  • dGPS differential GPS unit
  • a non-magnetic, largely metal-free carrier unit for the ensemble of sensors and data processing and storage units preferably in the form of a movement unit, eg. A cart on wheels, which can be pulled by a towing vehicle, such as a SUV, possibly also a slide above ).
  • Essential to the invention is that at least two sensors for magnetic field gradient measurement (particularly advantageous SQUID gradiometer) are provided for measuring a local magnetic field gradient having identical detection directions and are arranged at a distance one above the other, the signals of all sensors, (but especially the two vertically stacked Gradiometers) are recorded simultaneously and the different characteristics of these at least two superimposed gradiometers are used to determine the depth of the sources for the measured local changes in the Earth's magnetic field by taking advantage of the following features: • the magnitude of the measured magnetic field gradient with the fourth power of the distance between the sensor and the source falls off (whereas the magnetic field itself is only weaker with the cube, whereby the use of gradiometers clearly shows the depth discrimination sharper than possible with magnetometers),
  • the distance between the gradiometers and the base length of these gradiometers should be of the same order of magnitude. Then a good depth discrimination of the sources to be detected is possible to a depth that is about ten to a hundred times this Gradiometerabstandes.
  • two gradiometers are used in at least one sensor plane, preferably in the lower one, where the signals are larger and the lateral resolution is sharper due to the smaller distance between the sensors and the source look lateral directions. This always results in a sufficient sensitivity to arbitrary laterally oriented patterns of local sources of magnetic field gradients.
  • the device according to the invention and the method according to the invention are distinguished from previous technical solutions by the fact that 3D magnetic field mapping is possible by determining the specific depth and size of the objects to be detected.
  • FIG. 1 shows a schematic representation of an embodiment of the device according to the invention
  • Fig. 2 a graphic representation of the signal magnitude and the waveform of two Gradiometern, which are arranged at a distance of 10 cm above each other, when driving over an underlying magnetic dipole (travel in cm).
  • the apparatus shown in Fig.l comprises a plurality of SQUID gradiometer 1, which are located in a cryostat 2, a measuring unit 3 for accurately determining the location of the SQUID gradiometer during the measurement, consisting of a differential GPS unit, from a with the SQUID gradiometers mitbewegten GPS antenna 31 and a stationary mounted second GPS antenna 33 and the radio antennas 32 and 34, which transmits the signal of the fixed GPS antenna 33 to the GPS antenna 31 moved with the SQUID gradiometers 1, and an inertial unit for measuring the position of the SQUID gradiometer, consists of the data lines 4, all of which are recorded Data are transferred to the data acquisition and storage unit 5, and a non-magnetic, largely metal-free movement unit 6, on which the co-moving parts of the measuring unit are permanently mounted, wherein at least two gradiometer 11 are oriented in the same direction and arranged at a distance one above the other.
  • the signals of all SQUID gradiometers 1 (sensors), in particular of the two vertically superimposed SQUID gradiometers 11, can be recorded at the same time.
  • the different characteristics of these at least two superimposed SQUID gradiometers 11 are used to determine the depth of the sources for the measured local changes in the earth's magnetic field, it being noted that the magnitude of the measured magnetic field gradient is the fourth power of the distance between the SQUID gradiometer 1 (sensor) and the source drops (whereas the magnetic field itself is only weaker with the cube, whereby the use of SQUID gradiometers 1 makes the deep discrimination much sharper than with magnetometers) and that the local extension of the measured field with the Distance between the source and the SQUID gradiometer 1 (sensor) increases, in particular, the difference between the size of the measured from two superimposed SQUID gradiometers 1 signals of a magnetic field source with increasing distance between the source and the ensemble from one another arrange SQUID gradiometer 1 (sensors) becomes smaller.

Landscapes

  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

La présente invention concerne un dispositif et un procédé permettant une cartographie d'éléments à l'origine de modifications locales du champ magnétique terrestre. L'invention concerne plus particulièrement un dispositif et un procédé de cartographie d'éléments à l'origine de modifications locales du champ magnétique terrestre qui évitent les inconvénients de l'état antérieur de la technique, et qui, contrairement aux cartographies 2D du champ magnétique terrestre avec des systèmes de type SQUID, permettent de déterminer les profondeurs et les dimensions concrètes des objets à détecter. À cet effet, le dispositif comporte des capteurs de haute sensibilité servant à mesurer le gradient du champ magnétique terrestre, une unité de géolocalisation permettant de déterminer la position du capteur dans le champ de mesure à cartographier, un ordinateur à mémoire, ainsi qu'une unité support mobile amagnétique à laquelle sont fixés les capteurs, l'unité de géolocalisation et l'ordinateur à mémoire. Le dispositif comprend au moins deux capteurs orientés dans la même direction et disposés l'un au-dessus de l'autre avec un écartement vertical et servant, d'une part à mesurer le gradient local du champ magnétique, et d'autre part à enregistrer simultanément les signaux de tous les capteurs et de l'unité de géolocalisation.
EP08773268A 2007-06-28 2008-06-19 Dispositif et procédé de cartographie d'éléments à l'origine de modifications locales du champ magnétique terrestre Withdrawn EP2162766A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007030481A DE102007030481A1 (de) 2007-06-28 2007-06-28 Vorrichtung und Verfahren zur Kartierung von Quellen für die lokale Veränderung des Erdmagnetfeldes
PCT/DE2008/001006 WO2009000246A2 (fr) 2007-06-28 2008-06-19 Dispositif et procédé de cartographie d'éléments à l'origine de modifications locales du champ magnétique terrestre

Publications (1)

Publication Number Publication Date
EP2162766A2 true EP2162766A2 (fr) 2010-03-17

Family

ID=40186071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08773268A Withdrawn EP2162766A2 (fr) 2007-06-28 2008-06-19 Dispositif et procédé de cartographie d'éléments à l'origine de modifications locales du champ magnétique terrestre

Country Status (3)

Country Link
EP (1) EP2162766A2 (fr)
DE (2) DE102007030481A1 (fr)
WO (1) WO2009000246A2 (fr)

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Publication number Priority date Publication date Assignee Title
CN105640538B (zh) * 2016-04-01 2018-04-17 中国科学院上海微系统与信息技术研究所 一种全张量心磁图仪探头及其制造方法
GR1009521B (el) * 2018-02-14 2019-05-15 Σπυριδων Βασιλειου Μιχαλακοπουλος Γεωμαγνητικος σαρωτης και μεθοδος χρησης
CN109870734B (zh) * 2019-03-08 2024-05-28 中国石油天然气集团有限公司 三分量重力梯度场、三分量磁力梯度场获取装置和方法

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JPS499388B1 (fr) 1968-05-25 1974-03-04
US3916248A (en) 1970-04-06 1975-10-28 Us Navy Superconductive gradiometric device
US3829768A (en) 1973-09-04 1974-08-13 Us Navy Superconducting gradiometer for measuring first and second derivatives of a magnetic field
US4492923A (en) * 1982-06-21 1985-01-08 The United States Of America As Represented By The Secretary Of The Navy Apparatus for measuring the spatial scalar variation of a magnetic field with vector magnetic sensors on a moderately stable moving platform
DE4227876A1 (de) 1992-08-22 1994-02-24 Philips Patentverwaltung Schaltungsanordnung zum Betrieb eines SQUID's, insbesondere eines DC-SQUID's
US5321361A (en) * 1992-10-05 1994-06-14 Goodman William L Apparatus and method for detecting magnetically detectable plastic pipe and other sources of magnetic fields from a distance using a vertically aligned gradiometer on a horizontal support
AT404883B (de) 1993-11-22 1999-03-25 Oesterreichische Forschungs Un Verfahren zur hochgenauen ortung von unterirdisch verlegten kabeln und rohren
US5629626A (en) 1994-07-12 1997-05-13 Geo-Centers, Inc. Apparatus and method for measuring buried ferromagnetic objects with a high accuracy of position and in synchronization with a sync pulse provided by a global positioning system
DE19504841A1 (de) 1995-02-14 1996-08-22 Vallon Gmbh Anzeigeneinrichtung für ein Magnetometer
DE19518973C2 (de) 1995-05-23 1997-09-04 Kampfmittelbeseitigung Dr Ing Verfahren und Vorrichtung zur Tiefenbestimmung von ferromagnetischen und/oder anderen metallischen Objekten
US5777477A (en) * 1996-06-03 1998-07-07 The United States Of America As Represented By The Secretary Of The Navy Method of magnetic source localization using gradient tensor components and rate tensor components
US7443167B2 (en) * 2003-08-28 2008-10-28 Science Applications International Corporation Interleaved magnetometry and pulsed electromagnetic detection of underground objects
US6841994B1 (en) 2004-03-01 2005-01-11 The United States Of America As Represented By The Secretary Of The Navy Magnetic anomaly sensing system for detection, localization and classification of magnetic objects
DE102005011264A1 (de) * 2005-03-11 2006-09-28 OKM Ortungstechnik Krauß & Müller GmbH Verfahren zur Objektortung in einem vorgegebenen Gelände mittels einer Magnetfeldsondierung

Non-Patent Citations (1)

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Title
See references of WO2009000246A2 *

Also Published As

Publication number Publication date
WO2009000246A3 (fr) 2010-06-10
DE112008002308A5 (de) 2010-07-15
DE102007030481A1 (de) 2009-02-12
WO2009000246A2 (fr) 2008-12-31
DE112008002308B4 (de) 2021-12-02

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