EP1842085A1 - Detecteur servant a localiser des objets metalliques et appareil de mesure pourvu d'un tel detecteur - Google Patents

Detecteur servant a localiser des objets metalliques et appareil de mesure pourvu d'un tel detecteur

Info

Publication number
EP1842085A1
EP1842085A1 EP05810995A EP05810995A EP1842085A1 EP 1842085 A1 EP1842085 A1 EP 1842085A1 EP 05810995 A EP05810995 A EP 05810995A EP 05810995 A EP05810995 A EP 05810995A EP 1842085 A1 EP1842085 A1 EP 1842085A1
Authority
EP
European Patent Office
Prior art keywords
sensor
sensor according
coil
compensation transformer
transformer
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Withdrawn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
EP05810995A
Other languages
German (de)
English (en)
Inventor
Christoph Wieland
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 EP1842085A1 publication Critical patent/EP1842085A1/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Withdrawn legal-status Critical Current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
    • G01V3/08—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 present invention relates to a sensor for locating metallic objects according to the preamble of claim 1 and to a measuring device with such a sensor according to claim 10.
  • Inductive locating devices usually operate on the principle that a coil generates a magnetic field and a second coil again receives the magnetic field modified by a metal object.
  • the induced by metallic objects changes in the inductive properties are registered and evaluated by a receiving circuit of such a detector.
  • metallic objects trapped in a wall can in principle be located by means of one or more coils guided over the wall.
  • a technical difficulty in the detection of metallic objects is that the reaction of the objects to be located on the coil or the coils of the sensor arrangement is very small in terms of size. This applies in particular to the influence of non-ferromagnetic objects, such as, for example, the technically very important copper.
  • locating devices which compensate the empty signal by a second receiving coil, wherein the second receiving coil is connected to the first receiving coil such that the respective empty signals of the receiving coils cancel each other out.
  • the disadvantage of such a wiring is that influencing the receiving coils by an external metal object affects almost equally on both receiving coils and thus the relative signals, in absolute terms, are even smaller. Furthermore, additional costs result from an additional, second receiver coil.
  • a detector for locating metallic objects which has a receiving coil and a first transmitting coil, which are inductively coupled together.
  • a second transmitting coil is provided, which is also inductively coupled to the receiving coil.
  • the receiver coil and the two transmitter coils are arranged concentrically on a common axis, the two transmitter coils being dimensioned with respect to their number of turns and / or their dimensions so that the magnetic "empty currents" excited by the two transmitter coils in the receiver coil compensate one another.
  • the invention has for its object, starting from the detectors of the prior art, to provide a detector of the type mentioned, which generates the lowest possible off-set signal.
  • the object underlying the invention is achieved by a sensor for locating metallic objects having the features of claim 1.
  • the sensor according to the invention for locating metallic objects has at least one transmitting coil and at least one receiving conductor loop system, which are inductively coupled together, wherein the at least one transmitting coil is connected in series with a compensation transformer.
  • the compensation transformer which is connected in series with its primary side to the transmitter coil of the sensor, generates a voltage which is ideally also 90 ° out of phase and proportional to the transmission current. If one selects a suitable transmission ratio for this compensation transformer, then, with suitable series connection of the secondary winding of the transformer and the receiving coil, the empty signal of the sensor can be extinguished to zero. Since the compensation transformer remains uninfluenced by an external metal object, the output voltage of the transformer (compensation voltage) remains constant and independent of interference from an external metal object.
  • the full influence of the metal object to be detected on the receiving coil of the sensor can be tapped reception voltage is maintained and is not at least partially compensated by a corresponding voltage of a second receiving coil, which serves the compensation, at least partially.
  • the sensor according to the invention thus makes it possible to compensate for the empty signal of such a sensor without the need for a second receiver coil or transmitter coil for compensation.
  • An advantageous embodiment of the sensor according to the invention results from the fact that the numbers of turns of the primary and secondary side of the compensation transformer are selected as the number of turns of the at least one transmitting coil and the at least one receiving conductor loop system.
  • This advantageous dimensioning of the number of turns of transmitter coil, receiving conductor loop system and compensation transformer causes the total voltage U G tapped on the system, which results from the addition of the voltage U E induced in the receiver coil and the compensation voltage U K applied to the secondary side of the compensation transformer, in FIG Ideally, and in the absence of a metal object in the vicinity of the receiving coil to zero.
  • the compensation transformer of the sensor according to the invention may consist of a small ferrite ring core and be provided with two correspondingly dimensioned windings.
  • the compensation transformer can be partially or completely realized as a "print transformer" by, for example, the primary and / or secondary coil of the transformer applied directly to a printed circuit board, for example, is printed.
  • the compensation of the empty signal of the inventive sensor ie U Eohne at the receiving coil, in the absence of an external metal object
  • U Eohne at the receiving coil in the absence of an external metal object
  • the compensation of the empty signal of the inventive sensor can be realized, for example, by a simple series connection, in which the secondary side of the compensation transformer is connected in series with the receiving conductor loop system of the sensor.
  • the winding sense of the turns of the secondary side of the compensation transformer is selected to be opposite to the winding sense of the receiving conductor loop system.
  • a subtraction circuit can be provided which subtracts the compensation voltage U K of the compensation transformer from the voltage U E which is induced in the receiving conductor loop system.
  • a subtractor for example, it is still possible to fine tune the phase and the magnitude of the compensation voltage U K.
  • the use of higher frequencies is advantageous, since in these the penetration depth of the magnetic field in the object to be located decreases and thus the eddy currents induced in the object become more significant. Since the penetration depth in copper at an operating frequency of 100 kHz is already on the order of about 0.2 mm, in practice an increase in the detection quality is an increase. However, the working frequency is well above 200 kHz, but generally not effective.
  • this length is already substantially smaller than the dimension of relevant objects, such as, for example, power lines, water pipes or steel reinforcements.
  • Sensors which are intended to respond to both conductive and ferromagnetic objects must therefore make a compromise with respect to the frequency selection of the system and work expediently in a frequency range between 1 kHz and 10 kHz.
  • Particularly suitable is a frequency in the range of 4 to 6 kHz, since in this frequency window iron-containing objects and conductive objects of comparable size, measuring signals generate approximately the same amplitude.
  • a measuring device in particular a hand-held locating device can be realized in an advantageous manner, which has a significantly improved measuring sensitivity by the substantial compensation of the empty signal.
  • 1 shows the basic structure of a sensor geometry of a sensor for locating metallic objects according to the prior art in a schematic representation
  • 2 shows an embodiment of a sensor according to the invention in a simplified, schematic representation.
  • Figure 3 shows an embodiment of a measuring device with a sensor according to the invention
  • FIG. 1 shows the basic structure of a sensor or detector for locating metallic objects according to the prior art in order to clarify the basic principle of a compensation sensor.
  • detector and sensor are used synonymously in the context of this text.
  • Such a detector has three coils in its sensor geometry 10.
  • a first transmitting coil 12 which is connected to a first transmitter Sl
  • a second coil 14 which is connected to a second transmitter S2
  • a receiving coil 16 which is connected to a receiver E.
  • Each coil is shown in the representation of Figure 1 as a circular line.
  • the peculiarity of the arrangement of these three coils 12, 14 and 16 is that they are all arranged concentrically to a common axis 18.
  • the individual coils 12, 14 and 16 have different outer dimensions, so that the coil 12 can be inserted into the coil 14.
  • the two transmitting coils 12 and 14 of the device according to Figure 1 are fed by their transmitters Sl and S2 with alternating currents of opposite phase.
  • the first transmitting coil 12 in the receiving coil 16 induces a flux which is opposite to the flux induced by the second transmitting coil 14 in the receiving coil 16.
  • Both induced in the receiving coil 16 rivers compensate each other, so that the receiver E detects no received signal in the receiving coil 16, if there is no external, metallic object in the vicinity of the coil assembly 10.
  • the flux IT excited by the individual transmitting coils 12 or 14 in the receiving coil 16 depends on various variables, such as, for example, the number of turns and the geometry of the coils 12 and 14 and, for example, on the amplitudes of the two transmitting coils 12 and 12.
  • the first transmitting coil 12 which is connected to the first transmitter S1 and a second transmitting coil 14, which is connected to a second transmitter S2, are arranged coaxially with one another in a common plane.
  • the receiving coil 16 is arranged in a plane offset from the two transmitting coils 12 and 14.
  • Figure 2 shows a schematic representation of an embodiment of the shading of the transmitting and receiving coils of a erf ⁇ ndungsdorfen sensor and the associated compensation circuit, which is realized by means of a compensation transformer.
  • the sensor 110 has a transmitting coil 20 with a plurality of turns, which are indicated only schematically in the illustration according to FIG.
  • the transmitting coil may be a classically wound coil or else a corresponding conductor track structure on a printed circuit board.
  • the transmitting coil 20 is charged with an alternating current I 8 and generates a variable magnetic field in the frequency range of less than 1 MHz. Magnetic fields in a frequency band of 100 Hz to 200 kHz are preferably used in the sensor according to the invention.
  • the point 22 of the illustration in FIG. 2 corresponds to the angle connections and thus indicates the sense of winding of the transmitting coil 20.
  • the magnetic field of the transmitting coil 20 is modified by an object located in the vicinity of the coil, in particular a metallic object 24, and generates a corresponding induction current in the reception conductor grinding system 26, which is also shown only schematically in FIG.
  • the change in the magnetic field of the transmitting coil 20 due to the metal object 24 can be detected via a corresponding evaluation circuit of the receiver coil 26, for example by measuring the induced voltage U E.
  • the coils 20 and 26 a relatively strong signal ( "empty signal"), which can be tapped or measurable on the receiving coil U E
  • the dummy signal U E without also results in no metal object 24 in the vicinity.
  • the received signal for example.. at the reception Fangsspule 26 is proportional to the current I 8 in the transmitting coil and to ideally 90 ° out of phase.
  • a special compensation transformer 28 is provided, which is connected with its primary side 30 in series with the transmitter coil 20.
  • Such a compensation transformer generates a voltage U K , which is ideally also 90 ° out of phase and proportional to the transmission current I 8 . If one selects a suitable transmission ratio between the number of turns on the primary side 30 and the secondary side 32 of the compensation transformer, then with appropriate series connection of the secondary windings of the transformer with the turns of the receiving coil 26, the resulting empty signal cancel.
  • the compensation voltage U ⁇ on the secondary side 32 of the compensation transformer remains unchanged, however, with appropriately shielded Kompensionkondensator. As a result, the voltage U G which can be tapped off on the sensor according to the invention points to a metal object 24 which has been found.
  • a suitable transmission ratio of the primary and / or secondary windings of the compensation transformer is, in a first approximation, identical to the transmission ratio of the turns from the transmitting coil to the receiving coil. Since the compensation transformer 28 is arranged in the sensor 110 or an associated measuring device in such a way that it is uninhibited. flows from metal objects remains, the output voltage U ⁇ of the transformer 28 is independent of the interference by the metal object 24 and thus constant. As a result, the full influence of a metal object 24 on the receiving voltage U E is maintained and is not, as usual in sensors according to the prior art, also wegkompensiert.
  • the compensation transformer can, for example, consist of a ferrite ring core 40 and be provided with two correspondingly dimensioned windings 32 and 42.
  • the compensation transformer it is also possible to realize the compensation transformer as a print transformer by the primary and secondary coils of such a transformer applied directly to a printed circuit board, for example. Are printed.
  • Sensor system comprises an inventive measuring device, among other things still an evaluation circuit and an evaluation and computing unit which, ⁇ U from the corresponding measuring signals, such as. U E or U G information on the presence of a metallic object 24 determined. Such information is then transmitted to an output unit, for example an acoustic or optical output unit of an associated measuring device, so that a user is informed by a corresponding signal that an object has been located.
  • an output unit for example an acoustic or optical output unit of an associated measuring device.
  • the exact identification of the position of such an object which may be included, for example, in one, in Fig. 2 only indicated wall 44 may, for example, done by the output of the signal strength of the magnetic field disturbance due to the enclosed object or by the signal strength of one through this Magnetic field induced current.
  • the sensor according to the invention is integrated together with the control and evaluation unit and a corresponding output unit in a housing of a measuring device, in particular a compact, hand-held measuring device.
  • a measuring device can be moved with its housing by hand or else via arranged on the housing rolling elements on the surface of a wall to be examined or a floor or a ceiling.
  • FIG. 3 shows a possible embodiment of such a measuring device.
  • FIG. 3 shows an exemplary embodiment of a measuring device according to the invention in a perspective overview.
  • the meter has a housing 50 formed of upper and lower half-shells 52 and 54, respectively. Inside the case is at least a sensor according to Figure 2 provided with a coil arrangement for metal detection.
  • the interior of the measuring device has a signal generation and evaluation, and a power supply, eg. About batteries or rechargeable batteries on.
  • the measuring device according to FIG. 3 also has a display 56 for outputting an output signal correlated with the measuring signal. Via the display 56, for example a segmented bar graph or even a graphic display using an LCD, it is possible to represent the strength of the detected measuring signal.
  • the measuring device has a control panel 58 with a number of operating elements 60, which make it possible, for example, to switch the device on or off, and optionally to start a measuring process or a calibration process.
  • the measuring device according to FIG. 3 has a region 62 which is designed in its shape and material design as a handle 64 for guiding the measuring device according to the invention.
  • a handle 64 for guiding the measuring device according to the invention.
  • this On the side opposite the handle 64 side 70 of the measuring device, this has a housing 72 penetrating through the opening.
  • the opening 72 is arranged concentrically at least to the receiving conductor loop system 34 of the sensor. In this way, the location of the opening 72 in the measuring device, the center of the detection sensor, so that the user of such a device so that at the same time the exact location of a possibly detected object is displayed.
  • the meter additionally on its upper side marking lines 74, over which the exact center of the opening 72 and thus the position of an enclosed object can be located by the user.
  • the senor according to the invention can also be used as an additional sensor in measuring devices that use other measuring methods.
  • the compensated, inductive sensor as additional diagnostics in a radar locating device or else in an infrared locating device.
  • the sensor according to the invention and the measuring device according to the invention with such a sensor are not limited to the exemplary embodiments illustrated in the figures.
  • the senor according to the invention is not limited to the use of only one transmitting coil or one receiving conductor loop system. Multiple systems, optionally using multiple compensation transformers are also possible.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

L'invention concerne un détecteur servant à localiser des objets métalliques, en particulier un détecteur de métaux à induction (110) destiné aux matériaux de construction. Ce détecteur comprend au moins une bobine émettrice (20) et au moins un système de boucle conductrice de réception (26) connectés l'un à l'autre de façon inductive. Selon l'invention, la bobine émettrice (20) est montée en série avec le côté primaire (30) d'un transformateur de compensation (28). L'invention concerne en outre un appareil de mesure, en particulier un appareil de mesure portatif pourvu d'un tel détecteur.
EP05810995A 2005-01-18 2005-11-21 Detecteur servant a localiser des objets metalliques et appareil de mesure pourvu d'un tel detecteur Withdrawn EP1842085A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005002238A DE102005002238A1 (de) 2005-01-18 2005-01-18 Sensor zur Ortung metallischer Objekte sowie Messgerät mit einem solchen Sensor
PCT/EP2005/056093 WO2006076973A1 (fr) 2005-01-18 2005-11-21 Detecteur servant a localiser des objets metalliques et appareil de mesure pourvu d'un tel detecteur

Publications (1)

Publication Number Publication Date
EP1842085A1 true EP1842085A1 (fr) 2007-10-10

Family

ID=35589579

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05810995A Withdrawn EP1842085A1 (fr) 2005-01-18 2005-11-21 Detecteur servant a localiser des objets metalliques et appareil de mesure pourvu d'un tel detecteur

Country Status (6)

Country Link
US (1) US20080084212A1 (fr)
EP (1) EP1842085A1 (fr)
JP (1) JP2008527388A (fr)
CN (1) CN101103283A (fr)
DE (1) DE102005002238A1 (fr)
WO (1) WO2006076973A1 (fr)

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US8253619B2 (en) 2005-02-15 2012-08-28 Techtronic Power Tools Technology Limited Electromagnetic scanning imager
DE102005052369A1 (de) * 2005-10-31 2007-05-03 Robert Bosch Gmbh Messgerät
US7977938B2 (en) * 2007-05-04 2011-07-12 Solar Wide Industrial Ltd. Device and method of detecting ferrite and non-ferrite objects
EP2146431A3 (fr) * 2008-07-15 2014-07-30 Optosys SA Capteur de proximité inductif pour montage noyé et son procédé pour la conception de celui-ci
CA2739272A1 (fr) * 2008-10-02 2010-04-08 Certusview Technologies, Llc Procede et appareil de generation d'enregistrements electroniques d'operation de reperage
US8527308B2 (en) 2008-10-02 2013-09-03 Certusview Technologies, Llc Methods and apparatus for overlaying electronic locate information on facilities map information and/or other image information displayed on a locate device
GB2503582B (en) * 2008-10-02 2014-04-09 Certusview Technologies Llc Marking device docking stations and methods of using same
US8749239B2 (en) 2008-10-02 2014-06-10 Certusview Technologies, Llc Locate apparatus having enhanced features for underground facility locate operations, and associated methods and systems
WO2010133501A1 (fr) * 2009-05-18 2010-11-25 Sick Ag Capteur destiné à détecter des objets métalliques
EP2529608A1 (fr) 2010-01-29 2012-12-05 Certusview Technologies, Llc Station d'accueil pour équipement de localisation, couplée pour communiquer avec dispositif mobile/portatif ou équipée de tel dispositif
DE102010028722A1 (de) * 2010-05-07 2011-11-10 Robert Bosch Gmbh Erfassung eines metallischen oder magnetischen Objekts
DE102010027017A1 (de) * 2010-07-08 2012-01-12 Siemens Aktiengesellschaft Induktive Sensoreinrichtung sowie induktiver Näherungssensor mit einer induktiven Sensoreinrichtung
DE102011088435A1 (de) * 2011-12-13 2013-06-13 Robert Bosch Gmbh Handwerkzeugvorrichtung mit zumindest einer Ortungsantenne
DE102011088406A1 (de) 2011-12-13 2013-06-13 Robert Bosch Gmbh Metallsensor
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Also Published As

Publication number Publication date
WO2006076973A1 (fr) 2006-07-27
US20080084212A1 (en) 2008-04-10
JP2008527388A (ja) 2008-07-24
DE102005002238A1 (de) 2006-07-20
CN101103283A (zh) 2008-01-09

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