WO2015049766A1 - Dispositif de détection de métal - Google Patents

Dispositif de détection de métal Download PDF

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Publication number
WO2015049766A1
WO2015049766A1 PCT/JP2013/076985 JP2013076985W WO2015049766A1 WO 2015049766 A1 WO2015049766 A1 WO 2015049766A1 JP 2013076985 W JP2013076985 W JP 2013076985W WO 2015049766 A1 WO2015049766 A1 WO 2015049766A1
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WIPO (PCT)
Prior art keywords
determination
metal
lissajous waveform
inspection object
signal
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PCT/JP2013/076985
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English (en)
Japanese (ja)
Inventor
真彦 枝元
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株式会社システムスクエア
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Priority to PCT/JP2013/076985 priority Critical patent/WO2015049766A1/fr
Publication of WO2015049766A1 publication Critical patent/WO2015049766A1/fr

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    • 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

Definitions

  • the present invention relates to a metal detection apparatus including a transmission coil and a reception coil, and more particularly to a metal detection apparatus that can obtain a highly accurate inspection result using a Lissajous waveform.
  • an object to be inspected is supplied between a transmission coil and two reception coils, and the difference in induced power between the two reception coils is used as an output signal. can get.
  • the output signal is detected by the excitation signal of the transmission coil
  • the output signal is detected by a signal that is 90 degrees out of phase with the excitation signal.
  • Two detection outputs detected by signals with different phases are sent to the Lissajous waveform shaping unit, and a Lissajous waveform is drawn on the two-dimensional coordinates by the two detection outputs that change with the movement of the inspection object. Based on this, it is determined whether or not the object to be inspected contains metal.
  • Patent Document 1 describes two discrimination methods using Lissajous waveforms.
  • the first discrimination method an allowable frame surrounding the reference Lissajous waveform is set, and if the Lissajous waveform when passing the inspection object exceeds the allowable frame, it is determined that the inspection object contains a metal piece. To do.
  • the XY coordinates on which the Lissajous waveform is displayed are divided from the first quadrant to the fourth quadrant, and the area on the coordinates of the region surrounded by the Lissajous waveform in each quadrant is obtained. .
  • the calculated area in at least one quadrant is different from the reference area by a threshold value or more, it is determined that the object to be inspected contains a metal piece.
  • an abnormality is not determined unless the area surrounded by the Lissajous waveform changes beyond the threshold value. For this reason, even if the Lissajous waveform is greatly deformed by being convex on one side and concave on the other side in any quadrant, it is determined as normal unless the area exceeds the threshold value. Therefore, it is not possible to improve the detection accuracy such as mixing of metal pieces.
  • the present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a metal inspection apparatus that can detect the mixing of metal into an inspection object with high accuracy using a Lissajous waveform.
  • the present invention relates to a metal detection device provided with a transmission coil to which an alternating excitation signal is applied, a plurality of reception coils, and a transport mechanism that moves the inspection object toward the transmission coil and the reception coil.
  • the data processing unit includes a Lissajous waveform generation unit that draws a Lissajous waveform on a plane coordinate from the first detection signal and the second detection signal that change with the movement of the inspection object, and the plane coordinate
  • a determination line or region setting unit that sets a determination line or determination region on top, and a determination unit that determines that the inspection object is abnormal when the determination line or determination region and the Lissajous waveform share the same coordinate point And is provided.
  • the present invention is characterized in that a determination unit is provided that determines that the inspection object is abnormal when the determination line or the determination region and the Lissajous waveform do not share the same coordinate point. .
  • the coil signal is detected by AC signals whose phases are different from each other by 90 degrees.
  • the present invention can be configured such that the data processing unit is provided with a memory for storing a plurality of the determination lines or the determination areas set for each type of inspection object.
  • an operation unit is provided for setting the determination line or the determination area and storing it in the memory.
  • the determination line or the determination region is determined to be abnormal without sharing the same coordinate point as the reference Lissajous waveform when the inspection object to be determined to be normal is inspected.
  • the coordinate position sharing the same coordinate point as that of the abnormal Lissajous waveform when the object to be inspected is inspected is set.
  • the determination line or the determination region is set to at least one of an inner region surrounded by the reference Lissajous waveform and an outer region outside the reference Lissajous waveform.
  • the determination line or the determination region is set in both the inner region and the outer region.
  • the determination line or the determination region should share the same coordinate point as the reference Lissajous waveform when the inspection object to be determined to be normal is inspected and be determined to be abnormal.
  • the abnormal Lissajous waveform when the inspection object is inspected is set to a coordinate position that does not share the same coordinate point.
  • the abnormal Lissajous waveform is obtained by inspecting a normal inspection object with a metal sample installed.
  • both an abnormal Lissajous waveform using a magnetic metal sample and an abnormal Lissajous waveform using a non-magnetic metal sample are obtained.
  • a plurality of abnormal Lissajous waveforms are obtained by placing metal samples at different positions on a normal inspection object.
  • the metal detection device of the present invention does not share the same coordinate point as the Lissajous waveform when a normal inspection object is passed, and the Lissajous waveform when an abnormal inspection object containing metal is passed.
  • the metal detection device of the present invention can detect a normal inspection object and an abnormal inspection object with high accuracy by providing a determination line or a determination area at a coordinate position sharing the same coordinate point as the reference Lissajous waveform. become able to.
  • Explanatory drawing which shows only the principal part of the metal inspection apparatus of embodiment of this invention, Circuit block diagram of metal inspection equipment, A circuit block diagram showing the configuration of the data processing unit, Explanatory drawing showing the arrangement of the inspection object and the metal sample, An explanatory diagram showing a reference Lissajous waveform and a determination line when a normal inspection object is inspected, Explanatory drawing which shows the setting of a reference Lissajous waveform and a judgment area when inspecting a normal inspection object, An explanatory diagram of an abnormal Lissajous waveform obtained when a metal sample of magnetic metal is placed in the center of a normal inspection object, An explanatory diagram of an abnormal Lissajous waveform obtained when a metal sample of magnetic metal is placed on the front of a normal inspection object, An explanatory diagram of an abnormal Lissajous waveform obtained when a metal sample of a magnetic metal is placed on the back of a normal inspection object, An explanatory diagram of an abnormal Lissajous waveform obtained
  • the metal detection device 1 according to the first embodiment of the present invention shown in FIG.
  • the transport mechanism 2 has an upstream roller 3, a downstream roller 4, and a transport belt 5 hung on both rollers 3 and 4.
  • One of the upstream roller 3 and the downstream roller 4 is a driving roller and the other is a driven roller.
  • the inspection object W is transferred in the direction F by the transport mechanism 2.
  • the transmission coil Ct is opposed above the movement path of the inspection object W.
  • the winding axis of the transmission coil Ct extends in parallel with the conveyance direction (F direction) of the inspection object W.
  • Two receiving coils Cr ⁇ b> 1 and Cr ⁇ b> 2 are provided below the moving path of the inspection object W.
  • the number of turns of the reception coil Cr1 and the reception coil Cr2 is the same.
  • the reception coils Cr1 and Cr2 are arranged at intervals in the transport direction (F direction), and each is opposed to the transmission coil Ct.
  • the winding axes of the two receiving coils Cr1, Cr2 are located on the same line, and the winding axes extend in parallel with the transport direction (F direction).
  • an AC drive source 11 is connected to the transmission coil Ct, and an excitation signal 12 of AC current is given to the transmission coil Ct.
  • the two reception coils Cr1 and Cr2 are connected to each other, and a coil signal 13 is obtained that is a comparison value of induced power induced in the reception coil Cr1 and the reception coil Cr2 by the excitation magnetic field of the transmission coil Ct.
  • a resistor R1 is connected to the upstream receiving coil Cr1, and a resistor R2 is connected to the downstream receiving coil Cr2.
  • the receiving coils Cr1 and Cr2 have the same inductance, and the two resistors R1 and R2 have the same resistance value.
  • the voltage measured by the resistor R1 is applied to the plus terminal of the differential amplifier 14, and the voltage measured by the resistor R2 is applied to the minus terminal of the differential amplifier 14.
  • the winding directions of the receiving coil Cr1 and the receiving coil Cr2 are the same.
  • the induced power induced in the reception coil Cr1 and the induced power induced in the reception coil Cr2 by the excitation magnetic field from the transmission coil Ct The value is the same. Therefore, the input voltage to the plus terminal and the minus terminal of the differential amplifier 14 becomes the same, and the coil signal 13 becomes zero or a predetermined midpoint potential.
  • the differential amplifier 14 obtains a differential output (2 ⁇ E1) obtained by subtracting the voltage decrease measured by the resistor R2 ( ⁇ E1) from the voltage increase measured by the resistor R1 (+ ⁇ E1). This differential output becomes the coil signal 13.
  • the coil signal 13 is an AC signal having the same frequency as that of the excitation signal 12 supplied from the AC drive source 11, but the voltage decrease due to the eddy current loss of the nonmagnetic metal has a phase of 90 with respect to the excitation signal 12.
  • the AC component is delayed.
  • the coil signal 13 By setting a differential value (differential signal), which is a comparison value (comparison signal) between the two receiving coils Cr1 and Cr2, as the coil signal 13, the metal that has entered between the transmitting coil Ct and the receiving coils Cr1 and Cr2 can be obtained. Can be detected. Depending on whether the intervening metal is a magnetic metal or a nonmagnetic metal, the coil signal 13 includes an AC signal having a different phase.
  • the coil signal 13 is given to the first detection unit 15 and the second detection unit 16.
  • Both detection units 15 and 16 are phase detection circuits (synchronous detection circuits).
  • the coil signal 13 is detected by an AC signal having the same phase as the excitation signal 12.
  • the multiplier 15 a multiplies the coil signal 13 with an AC signal having the same phase as the excitation signal 12, and a DC component having a magnitude proportional to the amplitude of the coil signal 13 and 2 of the excitation signal 12.
  • An output obtained by adding the AC signal having the double frequency is obtained.
  • the first detection signal 18 which is the DC component is obtained.
  • the second detector 16 has a multiplier 16a and a low-pass filter 16b.
  • the excitation signal 12 from the AC drive source 11 is delayed by 90 degrees in phase by the phase shift circuit 17, and the second detector 16 detects the coil signal 13 using an AC signal that is 90 degrees out of phase, A detection signal 19 is obtained.
  • the first detection signal 18 is amplified by an amplifier 21, converted to a digital first detection signal 18 a by an A / D converter 22, and given to the data processing unit 30.
  • the second detection signal 19 is also amplified by the amplifier 23, converted to a digital second detection signal 19 a by the A / D converter 24, and supplied to the data processing unit 30.
  • the data processing unit 30 includes a CPU and a memory, and each processing unit indicated by a block in FIG. 3 is achieved by executing software.
  • the coil signals 13 from the receiving coils Cr1 and Cr2 are detected by AC signals having different phases different by 90 degrees, and then the first detection signal 18a and the second detection signal 19a digitized are converted into a data processing unit 30.
  • a vector value is calculated from the first detection signal 18 a and the second detection signal 19 a and is given to the Lissajous waveform generation unit 32.
  • a waveform signal is generated from the vector value and is supplied to the display driver 33.
  • a Lissajous waveform based on the waveform signal is displayed on the display screen 34 a of the display unit 34.
  • FIGS. 5 and 6 when a normal inspection object W not mixed with metal is moving in the F direction at a constant speed between the transmission coil Ct and the two reception coils Cr1, Cr2, A reference Lissajous waveform 41 displayed on the display screen 34a is shown.
  • the reference Lissajous waveform 41 is displayed on the display screen 34 a and stored in the waveform memory 35.
  • the reference Lissajous waveform 41 shown in FIG. 5 and FIG. 6 is obtained when an inspection object W in which ten pieces of roast ham are stacked and vacuum-packed with a transparent film packaging material is inspected.
  • both the contents and the packaging material contain a small amount of magnetic metal component and non-magnetic metal component. Therefore, the intensity and phase of the coil signal 13 change every moment as the inspection object W moves in the F direction.
  • the Lissajous waveform is drawn on the XY plane coordinates.
  • the X axis shows the intensity change of the first detection signal 18a
  • the Y axis shows the intensity change of the second detection signal 19a.
  • the locus where the coordinate point P obtained by the vector calculation of the first detection signal 18a and the second detection signal 19a having different phases changes as the object W moves in the direction F is a Lissajous waveform. is there.
  • the coordinate point P is adjusted so as to be located at the origin O of the XY coordinates. Thereafter, when the inspection object W moves between the transmission coil Ct and the two reception coils Cr1, Cr2, the coordinate point P moves to draw a waveform, and the inspection object W is received by the reception coils Cr1, Cr2. When it is out of the area, the coordinate point P returns to the origin O.
  • the reference Lissajous waveform 41 shown in FIGS. 5 and 6 differs depending on the type of the inspection object W.
  • the inspected object W used in FIG. 5 has a round ham as a content, and has a symmetrical shape in the moving direction (F direction). Therefore, when a normal inspection object W in which no metal foreign matter is mixed is inspected, the reference Lissajous waveform 41 has a rotationally symmetric shape of about 180 degrees around the origin O.
  • the data processing unit 30 is provided with a determination line or region setting unit 36 so that the determination line or region setting unit 36 can be operated from the operation unit 26 provided in the metal detection device 1. It has become.
  • the determination lines 51a, 51b, 51c, and 51d can be set in the XY coordinates as shown in FIG.
  • the determination lines may be collectively indicated by reference numeral 51.
  • the determination line 51 is set at a coordinate position that does not overlap with the reference Lissajous waveform 41 stored in the waveform memory 35.
  • the determination line 51 is set in an inner region surrounded by the reference Lissajous waveform 41 drawn in a loop shape (reference numerals 51a and 51b).
  • the determination line 51 is set outside the region surrounded by the reference Lissajous waveform 41 (reference numerals 51c and 51d).
  • the determination line 51 is set on both the inside and the outside of the region surrounded by the reference Lissajous waveform 41 (reference numerals 51a, 51b, 51c, 51d).
  • the determination line is set by a linear function so as to be drawn linearly on the XY plane coordinates as indicated by reference numerals 51a and 51b.
  • a curve is set by a multi-order function such as a quadratic function.
  • the determination lines 51a, 51b, 51c, and 51d are individually set according to the type of each inspection object W, and the determination lines 51a, 51b, 51c, and 51d corresponding to each of the plurality of types of inspection objects W are drawn. Data is stored in the judgment line or area memory 37.
  • a waveform signal is generated by the Lissajous waveform generation unit 32 and displayed.
  • a Lissajous waveform is drawn on the screen 34a.
  • the determination unit 38 provided in the data processing unit 30, the determination lines 51a, 51b, 51c, 51d stored in the determination line or the area memory 37 are compared with the waveform signal or Lissajous waveform created during the inspection.
  • the same coordinate point is shared by the Lissajous waveform intersecting or touching any of the determination lines 51a, 51b, 51c, and 51d, it is determined that there is a suspicion that the inspection object W contains metal.
  • the screen 34a displays that the inspected object W currently being inspected is abnormal, and also emits a warning sound.
  • the inspection object W to be inspected is from when it enters the reception range of the upstream reception coil Cr1 until it comes out of the reception range of the downstream reception coil Cr2.
  • the coordinate point P changes on the coordinates starting from the origin O.
  • the determination unit 38 tracks the movement of the coordinate point P at this time, and can immediately determine that there is an abnormality when the coordinate point P reaches the same coordinate as one of the determination lines 51a, 51b, 51c, 51d. . By this determination, it is possible to immediately give an abnormality determination before the moving inspection object W is out of the reception range of the reception coils Cr1 and Cr2.
  • the Lissajous waveform is completed between the time when the inspection object W to be inspected enters the reception range of the upstream reception coil Cr1 and the time when it exits the reception range of the downstream reception coil Cr2, and the completed Lissajous waveform is stored in the waveform memory 35. Temporarily save to. Then, the determination unit 38 may determine whether the Lissajous waveform held in the waveform memory 35 intersects or touches any of the determination lines 51a, 51b, 51c, 51d.
  • the determination line or region setting unit 36 is operated by operating the operation unit 26 to set the determination regions 52a, 52b, 52c, and 52d on the XY coordinates. You can also.
  • the determination area may be collectively indicated by reference numeral 52.
  • the determination areas 52a, 52b, 52c, and 52d are set to coordinate positions that do not overlap the reference Lissajous waveform 41 stored in the waveform memory 35.
  • the determination area 52 is set in an inner area surrounded by the reference Lissajous waveform 41 drawn in a loop shape, or is set in an outer area of the reference Lissajous waveform 41.
  • the determination area 52 is set both inside and outside the area surrounded by the reference Lissajous waveform 41.
  • the determination area 52 can be set as a polygon such as a rectangle, a square, or a trapezoid, or can be set as a shape such as a circle or an ellipse.
  • the determination areas 52a, 52b, 52c, and 52d are stored in the determination line or the area memory 37 in the same manner as the determination line 51, and the determination unit 38 determines which Lissajous waveform under examination is one of the determination areas 52a, 52b, 52c, If the same coordinate point is shared by crossing or contacting 52d, it is determined that there is a possibility of containing a metal foreign object.
  • a normal inspection object W (a normal inspection object W in which 10 pieces of roast ham are vacuum-packed with a packaging material) is installed in the transport mechanism 2, and a certain amount is set between the transmission coil Ct and the reception coils Cr1 and Cr2.
  • the reference Lissajous waveform 41 shown in FIGS. 5 and 6 is obtained and stored in the waveform memory 35.
  • a metal sample 55 containing iron powder which is a fine magnetic metal powder, is placed on the central portion (i) in the transport direction of a normal inspection object W and placed on the transport mechanism 2. Install.
  • this inspection object is supplied between the transmission coil Ct and the reception coils Cr1, Cr2, an abnormal Lissajous waveform 42 shown in FIG. 7 is generated.
  • the waveform signal of the abnormal Lissajous waveform 42 is stored in the waveform memory 35.
  • an abnormal Lissajous waveform 43 shown in FIG. 8 is generated, and the metal sample 55 is placed on the rear part (iii) in the conveyance direction of the inspection object. Then, an abnormal Lissajous waveform 44 shown in FIG. 9 is generated.
  • the waveform signals of these abnormal Lissajous waveforms 43 and 44 are stored in the waveform memory 35, respectively.
  • an abnormal Lissajous waveform 45 shown in FIG. 10 is generated.
  • an abnormal Lissajous waveform 46 shown in FIG. 11 is obtained, and when the metal sample 56 is placed on the rear part (iii) of the inspection object W, FIG.
  • the abnormal Lissajous waveforms 45, 46 and 47 are stored in the waveform memory 35.
  • the coordinates at which all the abnormal Lissajous waveforms 42 to 47 intersect or contact each other without intersecting or contacting the reference Lissajous waveform 41 in the determination line or region setting unit 36 are obtained.
  • a determination line 51 is set at the position.
  • the determination area 52 is set.
  • the determination line 51 or the determination region 52 it is preferable to use all of the six types of abnormal Lissajous waveforms 42 to 47, but using only a part of the abnormal Lissajous waveforms 42 to 47,
  • the determination line 51 or the determination area 52 may be set.
  • an abnormal Lissajous waveform 42 obtained by installing a metal sample 55 containing a magnetic metal in the central part (i) and an abnormality obtained by installing a metal sample 56 containing a nonmagnetic metal in the central part (i)
  • the characteristics of the waveforms are greatly different. Accordingly, when the determination line 51 or the determination region 52 is set at a coordinate position where the two abnormal Lissajous waveforms 42 and 45 intersect or touch each other, the other abnormal Lissajous waveforms 43, 44, 46, and 47 are also determined by the determination line 51 or the determination region 52.
  • the region 52 intersects or touches.
  • abnormal Lissajous waveform 43 shown in FIG. 8 obtained by arranging the metal sample 55 in the front part (ii) and the abnormal Lissajous waveform 44 shown in FIG. 9 obtained by arranging in the rear part (iii) are compared. Then, these two waveforms are approximately 180 degrees rotationally symmetric about the origin O. Therefore, if one of the abnormal Lissajous waveforms 43 and 44 is obtained, an appropriate set position of the determination line 51 or the determination region 52 can be predicted. This also applies to the relationship between the abnormal Lissajous waveform 46 shown in FIG. 11 and the abnormal Lissajous waveform 47 shown in FIG.
  • the determination line 51 or the determination area 52 is created by displaying the reference Lissajous waveform 41 and a plurality of abnormal Lissajous waveforms on the display screen 34a, and operating the operation unit 26 to draw the determination line 51 on the XY coordinates.
  • an image of the determination area 52 is created and stored in the determination line or area memory 37.
  • a plurality of determination lines 51 having different lengths and shapes and a plurality of patterns of determination regions 52 having different areas and shapes are stored in the determination line or region memory 37 in advance.
  • the operation unit 26 is operated to select one of the determination line 51 patterns or one of the determination region 52 patterns. , May be pasted on the XY coordinates.
  • the data of the reference Lissajous waveform 41 and the plurality of abnormal Lissajous waveforms 41 are compared by the calculation in the CPU, and the coordinate data of the plurality of abnormal Lissajous waveforms are intersected without intersecting or touching the coordinate data of the reference Lissajous waveform 41.
  • a place to be contacted may be selected, the pattern of the determination line 51 or the determination area 52 may be called from the memory, and automatically allocated and pasted.
  • determination line 51 or the determination area 52 may be used together instead of using either the determination line 51 or the determination area 52.
  • FIG. 13 is an explanatory diagram showing another embodiment of a method for setting the determination line 53 and the determination area 54.
  • the reference Lissajous waveform 41 always intersects or touches, so that the reference Lissajous waveform 41 shares the coordinate point and the abnormal Lissajous waveform does not intersect or touch any other, and the abnormal Lissajous waveform.
  • the determination line 53 and / or the determination area 54 are set in an area that does not share coordinate points. In this case, when the Lissajous waveform obtained when the inspection object W is inspected does not intersect all the determination lines 53 or all the determination areas 54 and is not in contact with each other, it is determined that the object is abnormal.
  • One or more determination lines 53 or determination areas 54 are set.
  • determination line 51 and the determination area 52 shown in FIGS. 5 and 6 may be used together with the determination line 53 and the determination area 54 shown in FIG.
  • an oxygen scavenger is enclosed with the contents such as food as the object to be inspected W
  • a normal Lissajous waveform containing the oxygen scavenger is inspected to obtain a reference Lissajous waveform
  • An abnormal Lissajous waveform may be generated from the inspection object from which the oxygen scavenger has been removed. Thereby, it is possible to detect an abnormal inspection object that does not contain an oxygen scavenger.
  • the metal detection device of the present invention is not limited to the one in which the transmission coil Ct and the reception coils Cr1 and Cr2 are opposed to each other.
  • the receiving coils CR1 and CR2 may be arranged coaxially, and the inspection object W may pass through the coils CT, CR1 and CR2.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

Le problème à résoudre dans le cadre de cette invention consiste à proposer un dispositif de détection de métal qui peut détecter des matériaux de test comprenant des corps étrangers métalliques avec une grande précision à l'aide de formes d'onde de Lissajous. La solution selon la présente invention concerne un matériau de test qui est déplacé entre une bobine d'émission et deux bobines de réception, un signal de bobine qui est obtenu correspond à la valeur de comparaison de la puissance électrique induite dans les deux bobines de réception, ce signal de bobine est détecté à l'aide de deux signaux de courant alternatif avec différentes phases, et un premier signal de détection et un second signal de détection sont obtenus. Lorsqu'un matériau de test normal (W) est déplacé, une forme d'onde de Lissajous (41) de référence est obtenue à l'aide du premier signal de détection et du second signal de détection. Une pluralité de lignes de détermination (51a, 51b, 51c, 51d) est définie dans les régions qui ne coupent pas ou ne viennent pas en contact avec la forme d'onde de Lissajous de référence, et si une forme d'onde de Lissajous obtenue pendant une mesure coupe ou vient en contact avec l'une des lignes de détermination quelconque, le matériau de test en cours de mesure est déterminé comme étant anormal.
PCT/JP2013/076985 2013-10-03 2013-10-03 Dispositif de détection de métal WO2015049766A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016217947A (ja) * 2015-05-22 2016-12-22 アンリツインフィビス株式会社 金属検出機
JP2020153830A (ja) * 2019-03-20 2020-09-24 アンリツインフィビス株式会社 金属検出機
CN114026416A (zh) * 2019-06-27 2022-02-08 安立股份有限公司 金属检测装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004086095A1 (fr) * 2003-03-12 2004-10-07 Anritsu Industrial Solutions Co., Ltd. Detecteur de metal
JP2007085873A (ja) * 2005-09-21 2007-04-05 Tetsuo Sakaki 探傷装置
JP2008058223A (ja) * 2006-09-01 2008-03-13 Anritsu Sanki System Co Ltd 金属検出装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004086095A1 (fr) * 2003-03-12 2004-10-07 Anritsu Industrial Solutions Co., Ltd. Detecteur de metal
JP2007085873A (ja) * 2005-09-21 2007-04-05 Tetsuo Sakaki 探傷装置
JP2008058223A (ja) * 2006-09-01 2008-03-13 Anritsu Sanki System Co Ltd 金属検出装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016217947A (ja) * 2015-05-22 2016-12-22 アンリツインフィビス株式会社 金属検出機
JP2020153830A (ja) * 2019-03-20 2020-09-24 アンリツインフィビス株式会社 金属検出機
CN114026416A (zh) * 2019-06-27 2022-02-08 安立股份有限公司 金属检测装置

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