WO2014191352A2 - Capteur inductif - Google Patents

Capteur inductif Download PDF

Info

Publication number
WO2014191352A2
WO2014191352A2 PCT/EP2014/060829 EP2014060829W WO2014191352A2 WO 2014191352 A2 WO2014191352 A2 WO 2014191352A2 EP 2014060829 W EP2014060829 W EP 2014060829W WO 2014191352 A2 WO2014191352 A2 WO 2014191352A2
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic field
field sensor
sensor
metal object
coil
Prior art date
Application number
PCT/EP2014/060829
Other languages
German (de)
English (en)
Other versions
WO2014191352A3 (fr
Inventor
Ralf Ph. SCHMIDT
Original Assignee
iCONTROLS k.s.
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 iCONTROLS k.s. filed Critical iCONTROLS k.s.
Publication of WO2014191352A2 publication Critical patent/WO2014191352A2/fr
Publication of WO2014191352A3 publication Critical patent/WO2014191352A3/fr

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
    • G01V3/101—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 by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil
    • 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 an inductive sensor for detecting a material and / or shape parameter of a metal object.
  • Time-varying magnetic fields induce eddy currents in metal objects, whose secondary magnetic field of material and / or
  • a responsive to the secondary magnetic field magnetic field sensor provides a response signal which information about the material and / or
  • the magnetic field sensor is arranged coaxially in the transmitting coil supplying the primary magnetic field.
  • An electrical evaluation circuit compares the response signal delivered by the magnetic field sensor in a test position with a reference signal which represents the material and / or shape parameter in a reference position of the blade. The evaluation circuit thus provides an information signal which, based on the reference position, represents a measure of any cracks present in the test position.
  • the evaluation circuit monitors with respect to the primary
  • the eddy current sensor comprises an AC-fed transmitting coil and a spaced-apart thereof, connected to an evaluation circuit
  • Receiver coil U-shaped cores made of ferromagnetic material
  • Pulse generator energized while the differential coil assembly is connected to an evaluation circuit that analyzes the waveform of the response signal of the receiving coil and depending on the times at which maximum values, minimum values, zero values or inflection points of the waveform occur detects the electrically conductive object.
  • the deviations of the response signals in the test positions of the response signals of the reference positions are often low, which reduces the accuracy with which material and / or shape parameters can be detected, decreases.
  • the distance of the transmitting coil and / or the magnetic field sensor from the metal object to be tested has a comparatively large influence on the determination of the material and / or shape parameter, which on the one hand, the accuracy of the determination deterioration of the material and / or shape parameter, or the built-in Limited situation when the inductive sensor is part of a plant or a machine with predetermined installation space ratios.
  • Material change by welds or welds also for the positioning of the metal objects in a suitable for subsequent processing spatial location.
  • Other examples are the detection of screw nuts, which are concealed behind holes in sheet metal parts or the detection of undesirable adhering sheet metal parts in a designed for feeding of sheet metal parts manufacturing plant.
  • Another field of application in which conventional eddy-current sensors can only be used to a limited extent is material recognition, for example the distinction between
  • Non-ferrous metal parts, iron parts or parts made of stainless steel are also only limited for the determination of hardness differences, in particular the surface hardness of
  • the invention is based on an inductive sensor for detecting a material and / or shape parameter of a metal object, which comprises:
  • Eddy current dependent response signal supplying magnetic field sensor in particular in the form of a Empfangsspuie and
  • an evaluation circuit which responds to the response signal and which represents a material and / or shape parameter
  • Transmitter coil and the magnetic field sensor are arranged transversely to their magnetic main axes side by side and the metal object based on the magnetic field main axes on the same side of the transmitting coil and the magnetic field sensor can be arranged, wherein the
  • the center of maximum sensitivity of the receiving coil at least overlaps, if not substantially completely covers, the region of maximum eddy currents induced by the transmitting coil in the metal object. This increases the
  • the sensitivity of the sensor can be improved in particular if, as will be explained in more detail below, the transmitting coil and / or the magnetic field sensor are associated with magnetic shielding means which prevent the magnetic field sensor from directly exceeding the magnetic field
  • the shielding means may be a shielding wall arranged between the transmitting coil and the magnetic field sensor act. Additionally or alternatively, the transmitting coil and / or the magnetic field sensor can be shielded individually.
  • the improvement consists in that the transmitting coil and the magnetic field sensor are arranged side by side, either
  • Metal object related to the magnetic field main axes on the same side of the transmitting coil and the magnetic field sensor can be arranged and that the evaluation circuit responds to the first occurring during the drive pulse in the waveform of the response signal extreme value and / or zero value and / or inflection point value and / or at least one However, a predetermined time after the start of the drive pulse still occurring during the drive pulse amplitude value of the waveform of the response signal responds and that the material and / or shape parameters
  • the information signal representing the material and / or shape parameter is already determined during the drive pulse, ie within a time span in which the drive pulse excites the transmit coil. It has been found that the response signal of the magnetic field sensor when the transmitting coil is excited is less susceptible to interference than in the case of an evaluation of the response. Signals with decaying excitation after the end of the drive pulse, as is common practice in conventional inductive sensors of the type in question.
  • the drive pulses are preferably narrow rectangular pulses with a pulse width between about 10 ns and 10 ps.
  • the drive pulses are expediently generated periodically with a pulse break which is sufficiently large to ensure that the influence of the drive pulse on the response signal has decayed to a negligible value until the occurrence of the next drive pulse.
  • the pulse interval is on the order of 50 to 200 ps.
  • Driver pulses specific response signal contains a wide
  • Frequency spectrum which allows to determine even relatively small changes in the material and / or shape parameter with sufficient accuracy.
  • the inductance of the transmitting coil and the amplitude of the driving pulse are dimensioned such that the response signal already has an extreme value during the pulse duration of the driving pulse.
  • the extreme value is a maximum value of the response signal.
  • the response signal starts at a minimum.
  • the extreme value is followed by a zero value of the response signal.
  • the transmitter coil is expediently dimensioned such that the zero value also occurs during the pulse duration of the driver pulse; However, the zero value may also depend on the inductance of the transmitting coil, the amplitude of the
  • Termination of the drive pulse occur. It has been found that the signal edge of the response signal leading from the first extreme value to the first zero value of the response signal is also a measure of the material and / or shape parameter of the metal object to be determined. The determination of the material and / or shape parameter representing
  • Information signal is dependent on the occurring during the drive pulse first extreme value and / or the first Zero value in the signal response of the response signal and / or dependent on an occurring during the drive pulse region of the signal edge of the response signal between the first extreme value and the first zero value and / or at least one inflection point value of the waveform.
  • the time of the first extreme value and / or the time of the first zero value in each case based on the beginning of the driver pulse can be evaluated here.
  • the amplitude value of the first extreme value and / or the amplitude value of the signal edge between the first extreme value and the first zero value and / or the signal progression gradient determined at a predetermined time during the drive pulse at the inflection point value for the determination of the material and / or form parameter representing information signal to be evaluated.
  • Metal object relative to the transmitting coil or the magnetic field sensor depends.
  • the distance of the metal object from the transmitter coil or the magnetic field sensor can therefore vary without this having any effect on the information signal.
  • An evaluation circuit of the type explained in the second aspect of the invention is preferably also used in the first aspect of the invention.
  • the signal profile of the response signal of the magnetic field sensor can also be achieved by correlating the signal profile of the response signal with a reference signal profile or else Information signal is transmitted by methods of a fast
  • the inductive sensor according to the invention is particularly suitable for determining deviations of the material and / or shape parameters of the metal object from a reference value of the parameter, as can be determined for example in a reference position of the metal object by means of the same inductive sensor. It is understood, however, that the reference value can also be predetermined based on empirical values.
  • the magnetic field sensor with the primary magnetic field generated by the transmitting coil is usually firmly coupled.
  • the accuracy of the evaluation can be improved if the direct magnetic field coupling of the transmitting coil and of the magnetic field sensor is reduced.
  • the inductive sensor according to the invention the transmitting coil and the magnetic field sensor are arranged on opposite sides of the metal object at a distance from each other, wherein the magnetic field sensor responsive to the secondary magnetic field induced by the primary magnetic field of the transmitting coil in the metal object eddy currents.
  • Metal object is expediently chosen in its dimensions so large that it also acts for eddy current shielding of the primary magnetic field with respect to the magnetic field sensor.
  • Transmitting coil and the magnetic field sensor are in this case in the direction of their magnetic field main axes opposite each other, in particular coaxially with each other, so that the magnetic field sensor is substantially aligned with the range of maximum eddy currents.
  • Magnetic field main axis is to be preceded and understood in the following the axis, along which the transmitter coil their magnetic field strength maximum has, or the magnetic field sensor its largest
  • Magnetic field strength sensitivity has.
  • the transmitting coil and the magnetic field sensor are arranged at a distance from each other on the same side of the metal object, transversely to their magnetic field main axes.
  • the proportion of the magnetic fields that cross over from the transmitting coil directly onto the magnetic field sensor can be reduced, with which the relative influence of the eddy currents induced in the metal object on the response signal increases.
  • the magnetic field main axes of the transmitting coil and the magnetic field sensor are inclined toward each other toward the metal object, so that, despite the
  • induced eddy currents can be aligned overlapping.
  • the transmitting coil and / or the magnetic field sensor In a preferred embodiment of the first and second aspects of the invention, the transmitting coil and / or the magnetic field sensor
  • the shielding means which at least partially shield the magnetic field sensor against directly exceeding magnetic field of the transmitting coil.
  • the shielding means may be ferromagnetic material. Preferably, however, it is after the
  • the shielding means may be a shielding wall arranged between the transmitting coil and the magnetic field sensor. Additionally or alternatively, the transmitting coil and / or the magnetic field sensor may be arranged in a shield cup open in the direction of the magnetic field main axis. It is understood that the shield cup optionally may have the shape of a socket open on both sides or the like.
  • the magnetic field sensor may have another, through
  • a compensating sheet metal part can be arranged on the side facing away from the metal object side of the transmitting coil and / or the magnetic field sensor, which changes the waveform of the response signal due to the induced eddy currents in it.
  • the shape and / or the dimensions of the compensation sheet metal part, in particular, the zero value of the reference response signal can be adjusted to zero.
  • the response signal of the magnetic field sensor can be influenced by reference materials brought directly into the influence range of the transmission coil and / or the magnetic field sensor, in particular for compensation or adjustment of the reference zero value of the reference response signal.
  • Metal object can be arranged, the comparison of the
  • a further magnetic field sensor in particular also be arranged in the form of another receiving coil, between the transmitting coil and the further magnetic field sensor, a reference metal object is arranged, in which the transmitting coil eddy currents induced on the magnetic field of the further magnetic field sensor responds, wherein the evaluation circuit for forming the reference value
  • Pulse generator excitable transmission coil at a distance from the
  • a reference metal object may be arranged, in which the further transmitting coil induces eddy currents, on the magnetic field of which the magnetic field sensor also responds, wherein the
  • Evaluation circuit provides the information signal depending on the difference of the response signals of the transmitting coil and the reference value.
  • a further transmitting coil or a further magnetic field sensor can be dispensed with if a reference metal object is additionally arranged between the transmitting coil and the magnetic field sensor in which the magnetic field of the eddy currents induced in the metal object to be investigated induces secondary eddy currents, to which the magnetic field sensor then responds or in which the magnetic field of the transmitting coil induces eddy currents whose magnetic field in turn induces the secondary eddy currents in the metal object to whose magnetic field the magnetic field sensor responds.
  • the transmitting coil and, as far as the magnetic field sensor is designed as a receiving coil
  • Reception coil designed as air coils.
  • inductive sensors with air coils are not affected by magnetic foreign fields, since air coils show no saturation behavior. In this way, for example, welding resistance of the inductive sensors can be achieved.
  • the amplitude of the evaluated during the drive pulse The response signal of the magnetic field sensor can fluctuate greatly, in particular if both extreme values and zero values are used for the evaluation
  • the evaluation circuit has an amplifier with a non-linearly decreasing gain factor as the input signal amplitude increases.
  • a logarithmic amplifier is suitable.
  • Figure 1 is a schematic representation of a first embodiment of an inventive, operating on the eddy current principle, inductive sensor;
  • Figures 2a and b are timing diagrams of a transmission coil of the sensor supplied driving pulses or detected by means of a receiving coil response signals;
  • Figure 3 is a schematic representation of a second embodiment of an operating according to the eddy current principle inductive sensor
  • FIGS. 4 to 6 variants of the inductive sensor according to FIG. 3.
  • Figure 1 shows an operating according to the eddy current principle, inductive sensor 1, with a material and / or shape parameter of a
  • Metal article 3 for example, a sheet metal part or a cast molding or the like and / or the deviation of this parameter can be detected by a reference value.
  • the sensor 1 has a transmitting coil 5, designed as an air coil, whose magnetic field main axis 7 is directed onto the metal object 3. On the same side of the
  • Metal object is at a distance next to the transmitting coil 5 a
  • Magnetic field sensor 9 here in the form of an air-core coil Reception coil arranged whose magnetic main axis 11 is directed at an angle ⁇ against the magnetic field main axis 7 of the transmitting coil 5 inclined to the metal object 3.
  • the magnetic field main axes 7, 1 1 thus have a smaller distance on the metal object 3 than between the transmitting coil 5 and the magnetic field sensor 9.
  • the transmitting coil 5 is excited by a series of rectangular pulses 13 (FIG. 2a) of a pulse generator 15, thus generating a primary one
  • Magnetic field sensor 9 responds. Since the magnetic field main axes 7, 1 1 are inclined towards each other toward the metal object 3, the maximum sensitivity range of the magnetic field sensor 9 overlaps the range of maximum eddy currents induced by the transmitting coil 5, which is the
  • the magnetic field sensor 9 is connected to an evaluation circuit 19 which receives a response signal S (FIG. 2 b) dependent on the secondary magnetic field via an amplifier 21 and evaluates it in more detail below with reference to FIGS. 2 a and 2 b and with one in a memory 23 stored reference value.
  • the evaluation circuit 19 outputs the material and / or shape parameter or its deviation from a reference value
  • the reference value in the memory 23, which may be a group of values indicative of the reference, may be given empirically or, as shown in Figure 1 for the region 17, measured in a reference position of the metal object 3 and
  • the evaluation circuit supplies 19 an information signal deviating from the reference value, which represents the change of the material and / or shape parameter of the metal object 3.
  • the reference value represents the change of the material and / or shape parameter of the metal object 3.
  • the sensor 1 compares the response signal evaluated for the area 17 'with the reference response signal evaluated for the reference area 17, which allows a proper identification as to whether the nut 29 is present or not.
  • a weld 31 is attached to the sheet metal article whose position relative to the metal object 3 is identifiable when the sensor 1 and the
  • Metal object 3 are moved relative to each other.
  • the sensor 1 thus allows automated alignment of the metal object 3 for further processing.
  • the sensor 1 also permits detection of other parameters, for example the detection of degrees of hardness, in particular surface hardness grades of metal components and their deviation from a reference value.
  • metal objects can be classified according to the type of metal, such as non-ferrous metal, steel or stainless steel.
  • the transmission coil 5 is excited by a sequence of rectangular drive pulses 13 of constant amplitude P 0 .
  • the drive pulses 13 have a pulse width T 0 between a few nanoseconds and a few microseconds, preferably about 2 to 3 ps.
  • the drive pulses 13 are separated from each other by pulse gaps Ti, which is substantially longer than the pulse width T 0 and, for example, between 50 and 200 ps.
  • the evaluation circuit 19 examines response signals of the magnetic field sensor 9 essentially only during the pulse duration T 0 of the drive pulses, the information signal representing the material and / or shape parameter of the metal object 3 in each case being dependent exclusively on Waveform of the response signal during the duration of the drive pulse 13 is determined. It has been found that the response signal is less affected by foreign influences, as long as the transmitting coil is excited by the driving pulse. Due to the pulse interval Ti, which is considerably longer than the pulse duration T 0 , the response signal can be up to
  • Driver pulses are relatively short square pulses, the response signal is influenced by a comparatively large frequency spectrum of the eddy currents, which the accuracy with which material and / or shape parameters of the metal object 3 can be recognized benefits.
  • FIG. 2b shows by way of example the signal curve of the response signal S of the magnetic field sensor 9 as a function of the time t.
  • solid line 31 is an example of the waveform of the
  • the signal curve of the response signal of the magnetic field sensor 9 changes, as illustrated by a dot-dashed signal profile 31 'for a material and / or shape configuration of the metal object 3 deviating from the reference region 17.
  • the maximum value 33 can change into the maximum value 33 ', wherein not only the time of the maximum value with respect to the beginning t 0 of the drive pulse can change from t m to but also the amplitude value S m of the maximum value in s m >.
  • the zero value 37 can change from the time t n to the zero value 37 'at the time t n -.
  • the slope and the shape of the falling edge 35 may change, as indicated at 35 '.
  • the flank shape can also be used to detect the material and / or shape parameter of the
  • Metal object 3 are evaluated, wherein at a predetermined time during the duration of the drive pulse, the amplitude of the signal waveform 31 and 31 'is detected.
  • the amplitude value of the signal curve 31 increases from S t for the reference value to S r . It is understood that amplitude values S t and S f can also be detected at several times ti.
  • the evaluation circuit 19 For the determination of the deviation of the material and / or shape parameter of reference values of the parameters and the monitoring whether predetermined limits of deviation are maintained or exceeded, the evaluation circuit 19 forms difference values, for example the time parameters t m and t m ' and / or t n and t rf and / or amplitude difference values S m and Sm and / or S t and S r .
  • the difference values are used with limit values and / or threshold windows for the determination of the material and / or
  • evaluation circuit 19 also evaluate the values of the response signal and / or according to predetermined algorithms for determining the information signal by comparison with limit values and / or
  • Evaluate threshold windows Also, differential values of a current information signal and a reference information signal can be formed and compared with limit values and / or threshold value windows.
  • the waveform of the response signal of the magnetic field sensor 9 may also contain inflection points in the mathematical sense, at which changes the sign of the slope change of the waveform, ie the second time derivative of the waveform is zero. Even such
  • Turning point values can be evaluated for determining the information signal, for example by comparing the slope value at the inflection point with a reference value or a threshold value and / or threshold value window.
  • Magnetic fields of the transmitting coil 5 can influence the response signal of the magnetic field sensor 9 which represents the secondary magnetic fields of the eddy currents.
  • the magnetic field sensor 9 is not only arranged transversely to the magnetic field main axes 5, 1 1 at a distance from the transmitting coil 5, but between the magnetic field sensor 9 and the transmitting coil 5 is a shielding wall 41 shielding the magnetic field (FIG ) arranged.
  • the transmitting coil and / or the magnetic field sensor 9 may be arranged in a magnetic field shielding cup 43 which is open to the metal object 3.
  • the shielding wall 41 and the shielding cup 43 may be made of ferromagnetic material, but are preferably formed as eddy current shielding means and made of non-ferromagnetic metal.
  • the shielding means 41, 43 act passively. Additionally or alternatively, the magnetic field sensor 9, a further from the pulse generator 15 with
  • Driver pulses excited transmission coil 45 may be assigned to at least partially compensated by the transmission coil 5 directly coupled to the magnetic field sensor 9 magnetic fields.
  • the passive or active shielding measures improve the response accuracy of the sensor to material and / or shape parameters of the metal article 3.
  • the transmitting coil 5 and / or the magnetic field sensor 9 may be assigned the electrically conductive materials influencing the magnetic field, as shown in FIG the metal object 3 facing away from the transmitting coil 5 and the magnetic field sensor 9 is indicated at 47.
  • Figure 3 shows a variant of an inductive sensor 1 a, which differs from the sensor 1 of Figure 1 only in that the transmitting coil 5a in the direction of their magnetic main axes 7a and 1a are spaced from each other, while the metal object 3a for the determination of the material and / or shape parameter between the
  • Transmit coil 5a and the magnetic field sensor 9a is located.
  • the transmitting coil 5a and the magnetic field sensor 9a are thus arranged on opposite sides of the metal object 3a.
  • the metal object 3a With sufficiently large transverse dimensions of the metal object 3a, as may be the case, for example, in the inspection of metal plates or the like, the metal object 3a simultaneously acts as a shielding of the magnetic field sensor 9a against direct coupling over of the primary magnetic field of the transmitting coil 5a.
  • the help of such an arrangement can be monitored not only the material and shape parameters, as explained with reference to Figure 1, but for example also separation errors, as may occur in material feeders, if instead, as desired, of individual metal objects, such as Example sheet metal pieces, two or more adhering sheet metal pieces of a further processing
  • magnétique field sensor 9a is expediently designed as a receiving coil, the coils 5a and 9a being air coils.
  • FIG. 4 shows an inductive sensor similar to the sensor of FIG. 3, but magnetic field sensors 9b and 9b ', which are designed as air coils on both sides in the direction of their magnetic field main axis 7b and excited by rectangular drive pulses, are spaced apart from the magnetic field sensor
  • Transmitter coil 5b are assigned.
  • the metal object 3b is arranged as shown in FIG. 3 between the transmitting coil 5b and the magnetic field sensor 9b.
  • a metallic reference object 3b is arranged between the transmitting coil 5b and the further magnetic field sensor 9b ', wherein the further magnetic field sensor 9b' detects the secondary magnetic field of the eddy currents induced by the primary magnetic field of the transmitting coil 5b in the reference object 3b '.
  • Evaluation circuit is responsive to the difference signal of the response signals of the magnetic field sensors 9b and 9b ', wherein the evaluation of the differential response signal is analogous to the explanations in connection with Figures 2a and 2b.
  • the shielding and compensating means 43 and 47 as explained with reference to FIG. 1 for the magnetic field sensor 9, may be present.
  • FIG. 5 shows a variant of an inductive sensor that differs from the sensor of FIG. 4 essentially only in that both sides of a common magnetic field sensor 9c, which is embodied as an air coil, have transmitting coils 5c and 5c 'with respect to the magnetic field axes 7c and 1c Distance from the magnetic field sensor 9c are arranged.
  • the metal object 3c is in turn arranged between the magnetic field sensor 9c and the transmitting coil 5c, while a reference metal object 3c 'is provided between the magnetic field sensor 9c and the further transmitting coil 5c'.
  • the two transmitting coils 5c and 5c ' are excited together by driving pulses, as explained with reference to FIG.
  • the response signal of the magnetic field sensor 9c becomes evaluated according to the explanations to Figure 1, 2a and 2b.
  • the shielding means 43 and compensating means 47 explained with reference to FIG. 1 can be present.
  • FIG. 6 shows a variant of an inductive sensor 1 d, which differs from the sensor 1 a of FIG. 3 essentially in that not only the metal object 3d, whose material and / or material are arranged between the transmission coil 5d and the magnetic field sensor 9d
  • Form parameter is to be detected, but in addition a reference metal object 3d '.
  • the magnetic field sensor 9d which in turn preferably takes the form of an air coil, and the transmitting coil 5d are in turn equiaxed but spaced apart from one another with respect to their magnetic field axes 7d and 11d, the reference metal object 3d 'being arranged between the metal object 3d and the magnetic field sensor 9d , In contrast to the sensor 1a of FIG.
  • the magnetic field sensor 9d does not respond to the secondary magnetic field of the eddy currents induced by the primary magnetic field of the transmitting coil 5d in the metal object 3d, but indirectly to a tertiary magnetic field, which in turn is due to eddy currents which are the secondary Magnetic field of the metal object 3d induced in the reference metal object 3d '. It is understood that the reference metal object 3d 'can also be arranged between the transmitting coil 5d and the metal object 3d.
  • the shielding means 43 and compensating means 47 explained with reference to FIG. 1 can be present.
  • the response signal of the magnetic field sensor 9d is evaluated in accordance with the explanations for FIG.

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)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

L'invention concerne un capteur inductif (1) qui est destiné à la détermination d'un paramètre de forme et/ou de matériau d'un objet métallique (3) et dont la bobine d'émission (5) excitée par des impulsions excitatrices rectangulaires induit des courants de Foucault dans l'objet métallique (3), le champ magnétique secondaire de ces courants étant capté par un capteur de champ magnétique (9). Le signal en réponse du capteur de champ magnétique (9) est analysé exclusivement pendant la durée des impulsions excitatrices rectangulaires excitant la bobine d'émission (5). La bobine d'émission (5) et le capteur de champ magnétique (9) présentent avantageusement des axes principaux de champ magnétique (7, 11) inclinés l'un vers l'autre et dirigés vers l'objet métallique (3).
PCT/EP2014/060829 2013-05-27 2014-05-26 Capteur inductif WO2014191352A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013209805.7 2013-05-27
DE102013209805.7A DE102013209805A1 (de) 2013-05-27 2013-05-27 Induktiver Sensor

Publications (2)

Publication Number Publication Date
WO2014191352A2 true WO2014191352A2 (fr) 2014-12-04
WO2014191352A3 WO2014191352A3 (fr) 2015-01-22

Family

ID=50841777

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/060829 WO2014191352A2 (fr) 2013-05-27 2014-05-26 Capteur inductif

Country Status (2)

Country Link
DE (1) DE102013209805A1 (fr)
WO (1) WO2014191352A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3385758A1 (fr) * 2017-04-05 2018-10-10 HILTI Aktiengesellschaft Dispositif et procédé de détection d'objets de mesure électroconducteurs dans un sous-sol
WO2019196998A1 (fr) 2018-04-09 2019-10-17 Københavns Universitet Détecteur de courant de foucault et procédé d'étalonnage d'un tel détecteur de courant de foucault
DE102021000156A1 (de) 2021-01-15 2022-07-21 Pepperl+Fuchs Se lnduktive Annäherungssensoreinheit und Verfahren zur Bestimmung einer Objekteigenschaft eines metallischen Erfassungskörpers
DE102021000157A1 (de) 2021-01-15 2022-07-21 Pepperl+Fuchs Se lnduktive Annäherungssensoreinheit und Verfahren zur Störungsüberprüfung bei einer induktiven Annäherungssensoreinheit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030193331A1 (en) 2002-04-15 2003-10-16 General Electric Company Method for in-situ eddy current inspection of coated components in turbine engines
EP2312338A1 (fr) 2009-10-19 2011-04-20 iControls, k.s. Dispositif et procédé de détection d'objets conducteurs d'électricité
DE102010009923A1 (de) 2010-02-25 2011-08-25 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 80686 Wirbelstromsonde, insbesondere Wirbelstromsonde in Transmissionsanordnung

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3676772A (en) * 1970-08-18 1972-07-11 Nasa Metallic intrusion detector system
DE3034426A1 (de) * 1980-09-12 1982-03-25 Bundesrepublik Deutschland, vertreten durch den Bundesminister für Wirtschaft in Bonn, dieser vertreten durch den Präsidenten der Bundesanstalt für Materialprüfung (BAM), 1000 Berlin Anordnung zur zerstoerungsfreien pruefung von elektrisch leitfaehigen werkstoffen auf der grundlage des impuls-wirbelstromverfahrens
DE3410547A1 (de) * 1984-03-22 1985-09-26 Institut Dr. Friedrich Förster Prüfgerätebau GmbH & Co KG, 7410 Reutlingen Pruefgeraet zum untersuchen elektrisch leitender pruefteile
FR2714470B1 (fr) * 1993-12-24 1996-03-01 Unimetall Sa Procédé et dispositif de contrôle magnétique.
DE4423661A1 (de) * 1994-07-06 1996-01-11 Foerster Inst Dr Friedrich Suchspulenanordnung
SE506154C2 (sv) * 1995-10-13 1997-11-17 Asea Brown Boveri Förfarande och anordning för induktiv mätning av mått och läge hos objekt av elektriskt ledande material
DE102004049024B3 (de) * 2004-09-20 2006-04-13 K.A. Schmersal Holding Kg Positionsüberwachungseinrichtung
DE102006053222B4 (de) * 2006-11-11 2009-01-29 Werner Turck Gmbh & Co. Kg Induktiver Näherungsschalter mit an einem Schirm befestigter Ergänzungsspule
FR2960068B1 (fr) * 2010-05-12 2013-06-07 Senstronic Dispositif de detection et de denombrement d'elements metalliques
EP2511736B1 (fr) * 2011-04-15 2016-02-17 iControls, k.s. Dispositif et procédé de détection d'objets conducteurs d'électricité

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030193331A1 (en) 2002-04-15 2003-10-16 General Electric Company Method for in-situ eddy current inspection of coated components in turbine engines
EP2312338A1 (fr) 2009-10-19 2011-04-20 iControls, k.s. Dispositif et procédé de détection d'objets conducteurs d'électricité
DE102010009923A1 (de) 2010-02-25 2011-08-25 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 80686 Wirbelstromsonde, insbesondere Wirbelstromsonde in Transmissionsanordnung

Also Published As

Publication number Publication date
DE102013209805A1 (de) 2014-11-27
WO2014191352A3 (fr) 2015-01-22

Similar Documents

Publication Publication Date Title
EP2312338B1 (fr) Dispositif et procédé de détection d'objets conducteurs d'électricité
EP1847810B1 (fr) Procédé et dispositif destinés à la détection de position
DE112012005839B4 (de) Aufzugkabinenstandorterfassungsvorrichtung
EP2511736B1 (fr) Dispositif et procédé de détection d'objets conducteurs d'électricité
EP3161472A1 (fr) Procédé et dispositif de test de flux de fuite
WO2010084146A1 (fr) Dispositif de détection conçu pour une cible dans laquelle des courants tourbillonnaires peuvent être générés, et procédé de détection
DE2928899C2 (de) Vorrichtung zur Bestimmung von Größe und Richtung der seitlichen Abweichung eines Prüfkopfes von der Mittellinie einer Schweißnaht
DE102015122154A1 (de) Vorrichtung zur Feststellung externer magnetischer Streufelder auf einen Magnetfeldsensor
WO2014191352A2 (fr) Capteur inductif
EP3131779B1 (fr) Dispositif et procédé de détection d'un élément perturbateur dans un système de transmission d'énergie par induction ainsi que système de transmission d'énergie par induction
WO2011082728A1 (fr) Dispositif de détection d'un dispositif de transport à bande et procédé pour détecter des corps étrangers électroconducteurs dans le produit transporté d'un dispositif de transport à bande
EP3830560B1 (fr) Analyse inductive d'objets métalliques
WO2014191351A2 (fr) Capteur inductif
EP3976439B1 (fr) Dispositif de capteur pour un ensemble de détection et d'analyse d'une roue d'un véhicule déplacée le long d'une voie, en particulier le long d'une voie ferrée
EP4030199B1 (fr) Unité inductive de détection de proximité et procédé de détermination d'une propriété d'objet d'un corps métallique de détection
EP3824323B1 (fr) Détecteur servant à détecter du matériau électriquement conducteur
EP1682884A1 (fr) Procede de determination quantitative de la longueur d'une region de zone molle d'une piece partiellement durcie
WO2017041855A1 (fr) Dispositif à capteur pour la détection d'un objet cible et procédé de fonctionnement d'un dispositif à capteur pour la détection d'objets cibles
DE3126379A1 (de) Geraet zum messen einer magnetischen remanenzinduktion
DE10135660C1 (de) Vorrichtung zur zerstörungsfreien Prüfung eines län glichen Gegenstands mittels der Wirbelstromtechnik im kontinuierlichen Durchlauf
DE102007027822A1 (de) Induktiv arbeitende Sensoranordnung und Verfahren zum Beeinflussen des Messverhaltens einer Messspule
DE102019122002B4 (de) Verfahren und Sensor zum Erfassen eines Metallobjekts
DE102012015200A1 (de) Induktiver Näherungsschalter
DE102020126872B3 (de) Verfahren zur induktiven Analyse metallischer Objekte sowie zugehörige Messanordnung
EP3931576B1 (fr) Dispositif et procédé servant à déterminer une vitesse ou une accélération d'un objet électro-conducteur, ainsi que système

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14726956

Country of ref document: EP

Kind code of ref document: A2

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC - FORM 1205A (02.02.216)