EP2783245A2 - Capteur métallique - Google Patents

Capteur métallique

Info

Publication number
EP2783245A2
EP2783245A2 EP12775457.0A EP12775457A EP2783245A2 EP 2783245 A2 EP2783245 A2 EP 2783245A2 EP 12775457 A EP12775457 A EP 12775457A EP 2783245 A2 EP2783245 A2 EP 2783245A2
Authority
EP
European Patent Office
Prior art keywords
coil
magnetic field
compensation
metal sensor
output voltage
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Withdrawn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
EP12775457.0A
Other languages
German (de)
English (en)
Inventor
Markus Hahl
Tobias Zibold
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 EP2783245A2 publication Critical patent/EP2783245A2/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Withdrawn legal-status Critical Current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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00

Definitions

  • METAL SENSOR The invention relates to a metal sensor according to claim 1, as well as a
  • the object of the present invention is therefore to provide an improved metal sensor with reduced or eliminated temperature dependence. This object is achieved by a metal sensor having the features of claim 1. It is a further object of the present invention to provide a method for operating the improved metal sensor. This object is achieved by a method having the features of claim 11. Preferred developments are specified in the dependent claims.
  • a metal sensor according to the invention comprises a primary coil, a compensation coil, a first further coil and a magnetic field sensor.
  • the first additional coil can be energized without energizing the primary coil and the compensation coil.
  • the size of a magnetic field generated only by the first further coil can be measured. From this, advantageously, a temperature dependence of the metal sensor can be determined.
  • this comprises a second further coil, which can be energized without energizing the primary coil and the compensation coil.
  • the second further coil is provided to generate a magnetic field which is oriented antiparallel to a magnetic field that can be generated by the first further coil.
  • the magnetic field generated by the second further coil is of the same strength as the magnetic field generated by the first further coil.
  • the antiparallel magnetic fields generated by the first further coil and the second further coil then overlap, thereby canceling out their dipole moments, which results in the far field of the two further coils having a quadrupole character in a leading order.
  • this comprises a disk-shaped circuit carrier.
  • the primary coil is the compensation coil and the first further coil is disposed on a first surface of the circuit carrier, while the second further coil is disposed on a second surface of the circuit carrier.
  • the coils can also be arranged on inner layers.
  • the magnetic field sensor can then be arranged such that the magnetic fields generated by the first further coil and the second further coil do not completely cancel each other out at the location of the magnetic field sensor.
  • a magnetic field generated at the same time as the primary coil, the compensation coil, the first further coil and the second further coil are energized at the location of the magnetic field sensor disappears.
  • the magnetic field sensor then generates a zero signal in the absence of a magnetizable object in the vicinity of the metal sensor, resulting in a temperature independence, a good signal-to-noise ratio and a high dynamics.
  • the primary coil, the compensation coil and the first further coil are connected in series.
  • this ensures that the primary coil, the compensation coil and the first additional coil are always flowed through by an exactly same current.
  • this allows a serial arrangement of the primary coil, the compensation coil and the first further coil and still allows a single energization of only the first further coil.
  • the primary coil and the compensation coil may be disconnected instead of being shorted.
  • a resistance component is connected in series with the primary coil, the compensation coil and the first further coil, wherein an electrical resistance of the resistance component corresponds approximately to the internal resistance of the series connection of the primary coil and the compensation coil.
  • the resistance component can be short-circuited.
  • the resistor component can then be connected in the series connection if the primary coil and the compensation coil are removed from the series connection by short-circuiting.
  • the electrical resistance of the series circuit then remains approximately constant, whereby a current flowing through the series circuit remains constant, whereby a temperature change caused by increasing or decreasing current flow is avoided.
  • the latter has a device for measuring an electrical current flowing in the coils.
  • a measurement of the current flowing in the coils allows compensation for a temperature dependence of the current flowing in the coils.
  • An inventive method for operating a metal sensor of the aforementioned type comprises steps for energizing the first further coil without energizing the primary coil and the compensation coil and for measuring a first output voltage of the magnetic field sensor, for energizing the first further coil without the primary coil and the compensation coil energizing and measuring a second output voltage of the magnetic field sensor, for energizing the primary coil, the compensation coil and the first further coil and for measuring a third output voltage of the magnetic field sensor, and for multiplying the third output voltage by a quotient of the first output voltage and the second output voltage to obtain a corrected third output voltage.
  • this method allows an exact elimination of a temperature dependence of the magnetic field sensor of the metal sensor.
  • the method also allows elimination of a temperature dependence of a current flowing through the coils, if an inductance of the coil can be neglected and a short circuit of the primary coil and the compensation coil not to a significant heating of the other coils and thus to a change in the ohmic resistance of these coils leads.
  • the first output voltage is measured at a fixed first temperature, the second output voltage measured at a second temperature, the third output voltage measured at the second temperature.
  • the first output voltage is measured at a fixed first temperature
  • the second output voltage measured at a second temperature in the second step also a first current flowing in the first further coil measured at the second temperature
  • the third output voltage the second temperature is measured, in the third step additionally a second current flowing in the first further coil measured at the second temperature
  • the corrected third output voltage multiplied by a quotient of the first current and the second current to obtain a fourth output voltage.
  • the method in this development also allows a compensation of a temperature dependence of the coil currents in the event that the inductances of the coils can not be neglected.
  • FIG. 1 shows a plan view of an upper side of a circuit carrier of a metal sensor
  • FIG. 4 is a schematic flow diagram of a method for operating a metal sensor.
  • a primary coil 200 On the top 1 11 of the circuit substrate 1 10 a primary coil 200, a compensation coil 300 and a first further coil 400 are arranged.
  • the coils 200, 300, 400 are each circular in shape and arranged concentrically to one another.
  • the primary coil 200 has a larger radius than the
  • the compensation coil 300 has a larger radius than the first further coil 400.
  • the number of turns of the coils 200, 300, 400 shown in FIG. 1 are chosen by way of example only.
  • the coils 200, 300, 400 may also have more or less Wnditch as shown in Fig. 1.
  • the coils may also have a different shape (e.g., rectangular) and need not be concentric.
  • the shape and arrangement must ensure that, in an object-free case, the magnetic field of the primary coil, of the compensation coil and of the other coils disappears at the location of the magnetic field sensor and that the magnetic field of the other coils does not disappear at the location of the magnetic field sensor.
  • the 300 has a first contact 310 at its outer end and a second contact 320 at its inner end.
  • the first further coil 400 has at its outer end a first contact 410 and at its inner end a second contact 420.
  • the second contact 220 of the primary coil 200 is electrically conductively connected to the first contact 310 of the compensation coil 300.
  • the second contact 320 of the compensation coil 300 is electrically conductively connected to the first contact 410 of the first further coil 400.
  • FIG. 2 shows a view of the circuit carrier 110 in which structures of the circuit carrier 110 are arranged on one side of the upper side 11 1 opposite the upper side 11 1.
  • the bottom 1 12 of the circuit substrate 110 has a second further coil 500, which has the same diameter and the same number of turns as the first further coil 400.
  • the underside 112 of the circuit carrier 110 has a first terminal 121, a second terminal 122, a third terminal 123 and a fourth terminal 124.
  • the terminals 121, 122, 123, 124 constitute outwardly accessible terminals of the circuit carrier 110 and may be electrically conductively connected to other components of the metal sensor 100.
  • the underside 112 of the circuit carrier 110 has a fifth terminal 125, a sixth terminal 126, a seventh terminal 127 and an eighth terminal 128.
  • the eighth terminal 128 is electrically connected to an inner end of the second another coil 500.
  • An outer end of the second further coil 500 is electrically connected to the first terminal 121.
  • the circuit carrier 110 also has a first via 131, which electrically connects the second connection 122 to the first contact 210 of the primary coil 200.
  • the first through-connection 131 like all further plated-through holes of the circuit carrier 110, is designed as an electrically conductive through-via (110) running through the circuit carrier 110.
  • a second via 132 electrically connects the fifth terminal 125 to the second contact 220 of the primary coil 200.
  • a third via 133 electrically connects the sixth terminal 126 to the first contact 310 of the compensation coil 300.
  • a fourth via 134 electrically connects the seventh terminal 127 a fifth via 135 connects the eighth terminal 128 electrically conductively connected to the second contact 420 of the first further coil 400.
  • the bottom 112 of the circuit substrate 1 10 further has a first switch
  • the switches 141, 142 may be formed, for example, as field effect transistors.
  • a first contact of the first switch 141 is conductively connected to the second terminal 122.
  • a second contact of the first switch 141 is electrically connected to the fifth terminal 125.
  • a control contact of the first switch 141 is electrically connected to the third terminal 123.
  • the first switch 141 is designed to conductively connect or isolate the second terminal 122 and the fifth terminal 125 in dependence on a control signal applied to the third terminal 123.
  • a first contact of the second switch 142 is electrically conductively connected to the sixth connection 126.
  • a second contact of the second switch 142 is electrically connected to the seventh terminal 127.
  • a control contact of the second switch 142 is electrically connected to the fourth terminal 124.
  • the second switch 142 is designed to electrically connect or isolate the sixth connection 126 and the seventh connection 127 in dependence on a control signal applied to the fourth connection 124.
  • the circuit carrier 110 also has a magnetic field sensor 150, which in the example shown is arranged in the center of the coils 200, 300, 400, 500.
  • the magnetic field sensor 150 may, for example, in a recess or a
  • the magnetic field sensor 150 is preferably designed as a magnetoresistive magnetic field sensor, but may also be another type of magnetic field sensor.
  • the magnetic field sensor 150 is provided to detect a size of a magnetic field prevailing at the location of the magnetic field sensor 150.
  • the magnetic field sensor 150 is designed to output an electrical voltage amplitude which describes the measurement signal of the magnetic field sensor 150 in amplitude and phase.
  • the metal sensor 100 can be operated in two different modes. In this case, an operating voltage is always applied between the first terminal 121 and the second terminal 122. If the switches 141, 142 are open, ie non-conductive, a current flow from the second connection 122 through the first via 131 to the first contact 210 of the primary coil 200, through the primary coil 200 to the second contact 220 of the primary coil 200, continues to the first contact 310 of the compensation coil 300 through the compensation coil
  • Coils 200, 300, 400, 500 flowed through by the same current.
  • the primary coil 200 and the second other coil 500 are flowed clockwise while the compensation coil 300 and the first other coil 400 are flowed counterclockwise.
  • the primary coil 200 and the compensation coil 300 generate antiparallel oriented magnetic fields.
  • the first further coil 400 and the second further coil 500 also generate antiparallel-oriented magnetic fields.
  • the first further coil 400 is flowed through in a counterclockwise direction, while the second further coil 500 is flowed through in a clockwise direction.
  • the first further coil 400 and the second further coil 500 generate antiparallel oriented magnetic fields.
  • FIG. 3 shows a view of the underside 12 of the circuit carrier 110 of a metal sensor 1100 according to a further alternative embodiment. Elements of the metal sensor 1100 which correspond to those of the metal sensor 100 of FIGS. 1 and 2 are given the same reference numerals.
  • the circuit carrier 110 of the metal sensor 1100 has an additional ninth terminal 129, which may be connected to other components of the metal sensor 1100.
  • a measuring resistor (shunt) 143 is arranged between the first terminal 121 and the second further coil 500. A voltage drop across the measuring resistor 143 electrical voltage can be measured by means of a voltmeter 144. The measurement result can be read out at the ninth connection 129.
  • the voltmeter 144 may be formed, for example, as a differential amplifier.
  • the measuring resistor 143 and the voltmeter 144 serve to quantify an electric current flowing through the coils 200, 300, 400, 500.
  • the direction of rotation of the first further coil 400 and the second further coil 500 are selected such that antiparallel magnetic fields are generated. Due to the low number of turns of the first further coil 400 and the second further coil 500, the magnetic field excited by the further coils 400, 500 is small in comparison to the magnetic fields generated by the primary coil 200 and the compensation coil 300. Matched Wndungszah- len and diameter of the two other coils lead to the same magnetic field strengths of the magnetic fields generated by the two other coils. The small diameter of the other coils 400, 500 cause a low magnetic field strength at a great distance. The antiparallel alignment of the two magnetic fields of the same strength leads to a cancellation of the dipole moments, so that the far field of the further coils 400, 500 has a quadrupole character in a leading order and thus drops rapidly with increasing distance.
  • the magnetic field sensor 150 is not located exactly in the middle between the first further coil 400 and the second further coil 500.
  • the magnetic fields generated by the further coils 400, 500 complement each other locally of the magnetic field sensor 150 is not exactly zero, but it remains a small residual field.
  • the primary coil 200 and the compensation coil 300 are adapted such that this small residual field is canceled as soon as all coils 200, 300, 400, 500 are energized.
  • the magnetic field sensor 150 measures a zero signal. If the primary coil 200 and the compensation coil 300 are short-circuited by means of the switches 141, 142, the small residual field is again applied to the magnetic field sensor 150.
  • the size of the residual field at the location of the magnetic field sensor 150 is independent of the presence of a magnetizable object in the vicinity of the metal sensor 100.
  • the size of the residual field can be temperature-dependent and therefore to mood and compensation for a temperature dependence of the metal sensor
  • Such a temperature dependence may, for example, result from a temperature dependence of the amplitude of a measurement signal supplied by the magnetic field sensor 150 and from a temperature dependence of the magnetic field generated by the primary coil 200, which in turn may be due to a temperature dependence of the internal resistance of the primary coil 200 and thereby to a temperature dependence of the magnetic field generated by the primary coil 200 Coils 200, 300, 400, 500 flowing electrical current is effected.
  • FIG. 4 shows a schematic flowchart of a method 600 for compensation of a temperature dependence of the metal sensor 100. The method
  • the 600 is applicable if the inductance of the coils 200, 300, 400, 500 can be neglected and the short circuit of the primary coil 200 and compensation coil 300 does not lead to significant self-heating of the further coils 400, 500 and thus to a change in the electrical resistances of the further coils 400, 500 leads.
  • a first method step 610 during a factory calibration of the metal sensor 100, the first further coil 400 and the second further coil 500 are energized without energizing the primary coil 200 and the compensation coil 300.
  • the primary coil 200 and the compensation coil 300 are thus short-circuited by the switches 141, 142.
  • a first output voltage 111 of the magnetic field sensor 150 measured.
  • the measured value 111 is stored, for example, in an evaluation circuit of the metal sensor 100.
  • a third method step 630 the primary coil 200, the compensation coil 300, the first further coil 400 and the second further coil 500 are energized.
  • the first switch 141 and the second switch 142 are therefore opened for this purpose.
  • a third output voltage U3 of the magnetic field sensor 150 is measured.
  • the third output voltage U3 is different from zero if a magnetizable object is located in the vicinity of the metal sensor 100.
  • the third output voltage U3 may be corrupted by a temperature dependence of the metal sensor 100.
  • a fourth method step 640 this temperature dependence is eliminated by multiplying the third output voltage U3 by a quotient of the first output voltage U1 and the second output voltage U2 in order to obtain a corrected third output voltage U3 ':
  • the corrected third output voltage U3 ' is released from a temperature dependence under the above assumptions.
  • a temperature dependence of the magnetic field sensor 150 is completely eliminated.
  • inductances of the coils 200, 300, 400, 500 are not negligible and / or the current flowing through the coils 400, 500 is also a temperature dependency, so an additional temperature compensation for the coil currents is necessary. This can be carried out in a development of the method 600, wherein the metal sensor 1100 of FIG. 3 is used.
  • the fourth output voltage U3 " is also adjusted for a possible temperature dependency of the coil currents, which also applies in the case that the inductances of the coils 200, 300, 400, 500 can not be neglected .. Instead of the first current 11 and the second current 12 In this case, the corrected third output voltage U3 'multiplied by a quotient of the first measurement voltage and the second measurement voltage to obtain the fourth output voltage U3 ". A possible temperature dependence of the measuring resistor 143 is thereby shortened. In a simplified embodiment, the second additional coil 500 can be dispensed with. However, this has the disadvantage that the magnetic field generated by the first further coil 400 then has dipole character in leading order and thus less rapidly decreases with increasing distance from the metal sensor 100, 1100.
  • the further coils 400, 500 could also have additional co-directional turns or additional opposing turns. In this case, the residual field measurable at the location of the magnetic field sensor 150 would be larger or smaller.
  • Additional coils could also be provided in order to cause the magnetic field generated by the further coils in a leading multipole arrangement not to have a quadrupole but, for example, an octupole character. In this case, the distance dependence of the magnetic field generated by the other coils would be even more favorable.

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)
  • Measuring Magnetic Variables (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

L'invention concerne un capteur métallique présentant un bobinage primaire, un bobinage de compensation, un premier autre bobinage et un capteur de champ magnétique. A cet effet, le premier autre bobinage est excité sans que le bobinage primaire ni la bobine de compensation ne soient excités.
EP12775457.0A 2011-11-22 2012-09-24 Capteur métallique Withdrawn EP2783245A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011086773A DE102011086773A1 (de) 2011-11-22 2011-11-22 Metallsensor
PCT/EP2012/068720 WO2013075861A2 (fr) 2011-11-22 2012-09-24 Capteur métallique

Publications (1)

Publication Number Publication Date
EP2783245A2 true EP2783245A2 (fr) 2014-10-01

Family

ID=47049135

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12775457.0A Withdrawn EP2783245A2 (fr) 2011-11-22 2012-09-24 Capteur métallique

Country Status (5)

Country Link
US (1) US9638825B2 (fr)
EP (1) EP2783245A2 (fr)
CN (1) CN104126133A (fr)
DE (1) DE102011086773A1 (fr)
WO (1) WO2013075861A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
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EP2976663A2 (fr) * 2013-03-21 2016-01-27 Vale S.A. Circuit de compensation pour annuler un champ magnétique

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WO2015005935A1 (fr) * 2013-07-12 2015-01-15 Schneider Electric USA, Inc. Procédé et dispositif de détection d'objet étranger dans un chargeur électrique à induction
US9829599B2 (en) * 2015-03-23 2017-11-28 Schneider Electric USA, Inc. Sensor and method for foreign object detection in induction electric charger
CN105182428B (zh) * 2015-07-29 2019-01-01 金华马卡科技有限公司 一种传感器、用于分析传感器的测量信号的方法以及检测物体的方法
US10185050B2 (en) * 2015-08-14 2019-01-22 Nabors Drilling Technologies Usa, Inc. Compensated transmit antenna for MWD resistivity tools
US9989663B1 (en) * 2015-09-09 2018-06-05 White's Electronics, Inc. Auto nulling of induction balance metal detector coils
CN109212614A (zh) * 2017-06-30 2019-01-15 北京至感传感器技术研究院有限公司 适用于开阔地的隐形安检系统及安检组件
CN107831547A (zh) * 2017-09-22 2018-03-23 永康市卓图工贸有限公司 一种金属探测器以及金属探测器对其检测线圈进行补偿的方法

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2976663A2 (fr) * 2013-03-21 2016-01-27 Vale S.A. Circuit de compensation pour annuler un champ magnétique
EP2976663B1 (fr) * 2013-03-21 2021-05-26 Vale S.A. Circuit de compensation pour annuler un champ magnétique

Also Published As

Publication number Publication date
US20140300351A1 (en) 2014-10-09
DE102011086773A1 (de) 2013-05-23
WO2013075861A2 (fr) 2013-05-30
WO2013075861A3 (fr) 2013-07-18
US9638825B2 (en) 2017-05-02
CN104126133A (zh) 2014-10-29

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