EP2633340A2 - Dispositif détecteur, en particulier détecteur de métaux comprenant un détecteur de champ magnétique à compensation de champ - Google Patents

Dispositif détecteur, en particulier détecteur de métaux comprenant un détecteur de champ magnétique à compensation de champ

Info

Publication number
EP2633340A2
EP2633340A2 EP11761560.9A EP11761560A EP2633340A2 EP 2633340 A2 EP2633340 A2 EP 2633340A2 EP 11761560 A EP11761560 A EP 11761560A EP 2633340 A2 EP2633340 A2 EP 2633340A2
Authority
EP
European Patent Office
Prior art keywords
sensor
magnetic field
coils
coil
sensor device
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Withdrawn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
EP11761560.9A
Other languages
German (de)
English (en)
Inventor
Reiner Krapf
Tobias Zibold
Andrej Albrecht
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2633340A2 publication Critical patent/EP2633340A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/0005—Geometrical arrangement of magnetic sensor elements; Apparatus combining different magnetic sensor types
    • 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
    • G01V3/10—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 using induction coils
    • G01V3/104—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 using induction coils using several coupled or uncoupled coils
    • G01V3/105—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 using induction coils using several coupled or uncoupled coils forming directly coupled primary and secondary coils or loops
    • G01V3/107—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 using induction coils using several coupled or uncoupled coils forming directly coupled primary and secondary coils or loops using compensating coil or loop arrangements

Definitions

  • the invention relates to a sensor device and a method for localization of objects enclosed in a medium, in particular metallic objects, according to the preamble of claim 1 and claim 15.
  • the invention describes a tool device, in particular a measuring device, for example a hand-held locating device with Such a sensor device for carrying out the method according to claim 15.
  • locating devices For detection of objects enclosed in a medium, such as, for example, a wall, a ceiling or a floor, such as, for example, electrical lines, water pipes, pipes, metal stands, locating devices have been used for some time.
  • inductive devices i. Devices that one
  • the object of the invention is the improvement of metal sensors for finding metallic objects in walls and floors in terms of miniaturization, integration and performance.
  • a core of the invention is a metal sensor for detecting metallic objects in walls and floors, which combines the advantages of field compensated, differential, coil-based sensors and the additional advantages of special magnetic field sensors, especially low-cost Hall sensors, but also AMR / GMR based magnetometers and SQU IDS, makes use of.
  • AMR sensor anisotropic magneto-resistive sensor
  • GMR sensor giant magneto-resistive sensor
  • SQUID superconducting quantum interference device
  • Magnetic field sensors are the compact size, high sensitivity, in particular a sensitivity to local magnetic field changes instead of changes in the magnetic flux through larger areas.
  • the invention proposes a system of transmitting coils and magnetic field sensors.
  • the sensor device according to the invention for the localization of objects enclosed in a medium, in particular for the detection of metallic objects, has an arrangement with at least two coils and a magnetic field sensor, wherein the arrangement of coils and magnetic sensor to each other and / or the number of coil turns and / or the sense of winding the coil and / or the coil current is / are selected such that the magnetic field generated by the coils at the location of the magnetic field sensor approximately disappears.
  • This secondary field can then according to the invention be measured by a magnetic field sensor.
  • the compensation of the primary field at the location of the magnetic field sensor achievable in this arrangement is very advantageous for the use of magnetic field sensors for the detection of metallic / magnetizable objects) since too high magnetic fields would bring the magnetic field sensor out of its working range.
  • high magnetic fields are necessary in the measurement in order to generate sufficiently high magnetic fields at the location of the object, so that the resulting secondary fields at the location of the sensor are still sufficiently high.
  • the device according to the invention makes it possible advantageously to minimize the primary field or even to make it disappear, but that induced by the primary field
  • Secondary field of an object to be detected is sufficiently large to be detected with a magnetic field sensor.
  • Another advantage of the compensation of the primary field is that the ratio of object-conditioned signal (signal resulting from secondary field) to basic signal
  • the described system of transmitting coils and magnetic field sensor can be realized in an advantageous manner with a drive according to the push-pull regulator principle.
  • Advantages of the push-pull controller are the high dynamics over a large field range and the high signal-to-noise ratio due to the advantageous use of a synchronous demodulator.
  • the secondary fields are very small (typically a few 10 nT). Therefore, the high-sensitivity AMR / GMR magnetic sensors are particularly suitable for such an embodiment while Hall sensors are less suitable in this case.
  • Figure 1 shows a typical arrangement of an inventive
  • 4a, 4b show the calculated z component of the primary magnetic field of two coils of the sensor device, as well as the secondary magnetic field generated by an object, in an overview (2a), as well as in a detailed representation (2b),
  • FIG. 5 control of the sensor device according to the invention by means of a push-pull controller
  • Figure 6 shows an embodiment of an inventive tool in the form of a tracking device. Description of an embodiment
  • FIG. 1 shows a possible embodiment of a device according to the invention
  • FIG. 1 The arrangement of a sensor device according to the invention shown by way of example in FIG. 1 has two coils ("outer coil 12", “inner coil 14"), which are used in space for a periodically changing quasi-stationary one
  • Magnetic field in particular a dipole field to produce (see also, for example, Figure 2).
  • a magnetic field sensor 16 which may be formed, for example, as a Hall sensor, an AMR or GMR sensor or else as a SQUID, is used to measure a magnetic field, which is generated in particular by an object to be detected.
  • Coils and the sensor to each other, and number of turns, sense of winding, and coil current of the coils are inventively chosen such that the magnetic field generated by the coils at the location of the magnetic field sensor (and ideally only there) approximately (and ideally exactly) disappears, i. becomes zero, so at the location of the magnetic field sensor field compensation takes place.
  • An ideal field compensation in which the magnetic field of the coils in the mathematical sense to zero, is hardly realizable from a practical point of view. This is to be expressed by the term "approximate" disappears, the rest and so-called “dirt effects", the absolute
  • the two coils 12, 14 of the sensor device in the embodiment of Figure 1 are concentric with each other in a common plane, in particular on a common circuit board 18 is formed.
  • N number of turns of the outer coil
  • d diameter of the outer coil
  • N ' number of turns of the inner coil
  • d' diameter of the inner coil
  • the respective coil diameter must be large relative to the pitch of the individual coil turns in the coil.
  • An advantage of using two coils with opposite sense of winding is in particular that one can connect the coils in series.
  • the coils are formed as a print coil on the circuit board 18.
  • the transmitter coils are adjacent to each other and / or overlap, for example.
  • a core of the invention is always to mount the magnetic field sensor in a range disappearing coil magnetic field.
  • a magnetic field sensor 16 in the embodiment of a GMR sensor is arranged in the embodiment of FIG.
  • Alternative magnetic field sensors are also possible.
  • the preferred direction of the sensor that is, the direction to the magnetic fields must be parallel to be measured by the sensor with maximum sensitivity, in a planar, concentric coil assembly with magnetic field sensor in the coil center, as shown in Figure 1, in the normal direction of the coil plane demonstrate.
  • the compensation of the primary field at the location of the magnetic field sensor 16 is advantageous for the use of a magnetic field sensor in this application (detection of metallic / magnetizable objects), since too high magnetic fields bring the sensor 16 out of its working range. However, high magnetic fields are necessary to generate sufficiently high magnetic fields at the location of the object, so that the resulting secondary fields at the location of the sensor 16 are still sufficiently high.
  • Another advantage of the compensation of the primary field is that the ratio of object-related signal (signal resulting from secondary field) to basic signal (signal resulting from primary field) is improved by several orders of magnitude.
  • the diameter of the inner coil is substantially limited by the size of the magnetic field sensor and is thus at a minimum value of about 5 mm
  • Figures 2a and 2b show the calculated magnetic field of two print coils (outer coil with 4 turns, radius 2 cm), inner coil (1 turn, radius 0.5 cm) in the x-z plane.
  • the magnetic field is rotationally symmetric about the z-axis.
  • the left-hand figure 2a shows the dipole-shaped field in the outer region
  • the right-hand figure 2b shows the compensation of the fields generated by the two coils in the region of the inner coil.
  • Figures 3a and 3b show calculated magnitudes of the magnetic field of the outer coil (A), the outer and inner coils (B).
  • the curves show that the magnetic field of the outer and inner coil disappears together at the origin (so-called "field compensation") .
  • the outdoor field is almost unaffected by the compensation, which is important to ensure the same sensor range without the additional compensation coil in Shape of the inner coil would be achieved.
  • Figure 4 shows the z-component of the primary (C) and secondary magnetic field (D) along the z-axis.
  • Figure 4b shows a detail in the immediate vicinity of the zero point, compare the respective scales).
  • the described system of transmitting coil and magnetic field sensor can be controlled very well and advantageously with a push-pull controller 20.
  • Advantages of the push-pull controller are the high dynamics over a large field range as well as the high signal-to-noise ratio by using a synchronous demodulator.
  • FIG. 5 shows an exemplary connection of the coils and of the magnetic sensor in push-pull operation.
  • the push-pull regulator 20 consists of a signal source 24, controllable amplifiers 26, 28, synchronous demodulator 22 and integrating comparator 30.
  • the controllable amplifiers 26, 28 energize the two transmitting coils 12, 14 with 180 ° phase-shifted, periodically changing Currents of independent amplitude.
  • the transmitting coils (for example outer and inner coils according to FIG. 1) are now wound in such a way that, at least in the absence of metallic / magnetizable objects in the region of the transmitting coil field, they produce - at least at one time - oppositely directed magnetic fields which cancel out at the location of the sensor.
  • the sensor 16 is optionally connected to the synchronous demodulator 22 via an optional amplifier 32.
  • the push-pull control via the integrating comparator 30 controls the amplitudes of the transmitting coil currents by means of the controllable amplifiers 26, 28 in such a way that the magnetic field disappears at the location of the sensor even if a metallic / magnetizable object is present in the region of the transmitting coil field at least at one point in time.
  • This control value changes in the presence of a metallic / magnetizable object and can therefore be used to detect such.
  • the use of multiple magnetic field sensors at each of the locations that are held by the respective compensation coil field-free is an advantageous Variant of the sensor device according to the invention.
  • the advantage of this is that you can measure the secondary field (ie, the field generated by an object to be measured) at different locations and thus at least in principle conclusions about object properties, such as the lateral position, the Ein gleichtiefe or orientation can draw
  • FIG. 6 shows a possible exemplary embodiment of a tool device according to the invention as a measuring device, in the form of a hand-held locating device 86g, which has a sensor device according to the invention.
  • the hand-held device 86g has a locating device 24g with a sensor device 26g according to the invention.
  • the sensor device 26g comprises in the manner already described at least two coils and at least one magnetic field sensor, which are arranged in accordance with the invention and operate according to the inventive method.
  • the locating device 24g further comprises a drive unit 28g, in particular with a push-pull control 20, and an evaluation unit 30g for processing and processing the measurement signals.
  • the control signal 32 of the push-pull control 20 can be used by the evaluation unit 30g in order to characterize an object as detected or not detected. That is, the control signal 32 of the differential mode control of the sensor device according to the invention is used to detect the objects.
  • the manual positioning device 86g also has rollers 88g with distance measuring means, not shown in more detail, by means of which an operator can move the hand-held device 86g along the medium.
  • the hand-held location device 86g displays detected objects as a function of the traveled path.
  • the displacement sensor allows the assignment of a detection value of the sensor device according to the invention to a spatial position of the measuring device.
  • the measuring device according to the invention enables the correlated representation of the detection signal and position of enclosed objects via a corresponding output unit, 90g, in particular a graphic display.
  • the displacement sensor can be dispensed with and the detection of an object, for example, only by a light signal and (/ or an acoustic signal to be transmitted.
  • the method according to the invention or a tool device operating according to this method is not limited to the exemplary embodiments illustrated in the figures. In particular, the inventive method is not limited to the
  • a core of the invention is to attach the magnetic field sensor in a range disappearing coil magnetic field.
  • the use of multiple magnetic field sensors at each of the locations that are kept free of field by the respective compensation coil is an advantageous variant of the sensor device according to the invention.
  • the advantage of this is that you can measure the secondary field (ie, the field generated by an object to be measured) at different locations and thus at least in principle conclusions about object properties, such as the lateral position, the Ein gleichtiefe or orientation can draw
  • the magnetic field could be brought to zero by a shielding device and the magnetic sensor be mounted in the appropriate place.
  • the tool according to the invention is not limited to a measuring device, in particular a tracking device. Also sawing, grinding or drilling
  • Tool devices can with the sensor device according to the invention be equipped as it is integrated as in the tool device measuring system or as a tool to be attached to the accessory.

Landscapes

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

Abstract

L'invention concerne un dispositif détecteur, en particulier un détecteur de métaux, comprenant au moins deux bobines et un détecteur de champ magnétique, l'agencement des bobines et du détecteur de champ magnétique les uns relativement aux autres et/ou le nombre de spires des bobines et/ou le sens d'enroulement des bobines et/ou le courant des bobines étant choisi(s) de telle manière que le champ magnétique généré par les bobines disparaît pratiquement à l'emplacement du détecteur de champ magnétique. L'invention concerne en outre un procédé de détection d'objets, en particulier un procédé pour découvrir des objets métalliques, par l'utilisation d'au moins deux bobines et d'un détecteur de champ magnétique, en particulier un détecteur à magnétorésistance anisotrope (AMR), à magnétorésistance géante (GMR), ou à effet Hall, dans lequel l'agencement des bobines et du capteur magnétique les uns relativement aux autres et/ou le nombre de spires des bobines et/ou le sens d'enroulement des bobines et/ou le courant des bobines sont choisi(s) de telle manière que le champ magnétique généré par les bobines disparaît pratiquement à l'emplacement du capteur de champ magnétique.
EP11761560.9A 2010-10-28 2011-09-21 Dispositif détecteur, en particulier détecteur de métaux comprenant un détecteur de champ magnétique à compensation de champ Withdrawn EP2633340A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010043078A DE102010043078A1 (de) 2010-10-28 2010-10-28 Sensorvorrichtung, insbesondere Metallsensor, mit feldkompensiertem Magnetfeldsensor
PCT/EP2011/066378 WO2012055641A2 (fr) 2010-10-28 2011-09-21 Dispositif détecteur, en particulier détecteur de métaux comprenant un détecteur de champ magnétique à compensation de champ

Publications (1)

Publication Number Publication Date
EP2633340A2 true EP2633340A2 (fr) 2013-09-04

Family

ID=44719898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11761560.9A Withdrawn EP2633340A2 (fr) 2010-10-28 2011-09-21 Dispositif détecteur, en particulier détecteur de métaux comprenant un détecteur de champ magnétique à compensation de champ

Country Status (5)

Country Link
US (1) US20130300401A1 (fr)
EP (1) EP2633340A2 (fr)
CN (1) CN103154775A (fr)
DE (1) DE102010043078A1 (fr)
WO (1) WO2012055641A2 (fr)

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Also Published As

Publication number Publication date
CN103154775A (zh) 2013-06-12
US20130300401A1 (en) 2013-11-14
WO2012055641A3 (fr) 2012-10-18
WO2012055641A2 (fr) 2012-05-03
DE102010043078A1 (de) 2012-05-03

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