WO2006057409A1 - 金属検知装置の電磁誘導センサ及び金属探知方法 - Google Patents
金属検知装置の電磁誘導センサ及び金属探知方法 Download PDFInfo
- Publication number
- WO2006057409A1 WO2006057409A1 PCT/JP2005/021903 JP2005021903W WO2006057409A1 WO 2006057409 A1 WO2006057409 A1 WO 2006057409A1 JP 2005021903 W JP2005021903 W JP 2005021903W WO 2006057409 A1 WO2006057409 A1 WO 2006057409A1
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- coil
- metal piece
- detection
- electromagnetic induction
- induction sensor
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Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
Definitions
- the present invention relates to an electromagnetic induction sensor and a metal detection method used in a detection device for a metal piece mixed in or latent in food, industrial materials, clothes, mail, etc., a landmine detection device, and the like.
- electromagnetic sensors have been used in detection devices for metal pieces mixed in foods, industrial materials, and the like.
- the electromagnetic sensor 11 disclosed in this publication includes a belt conveyor having a belt 13 that conveys an inspection object 12.
- the electromagnetic sensor 11 for detecting the presence or absence of a metal piece mixed in the inspection object 12 conveyed by the belt conveyor includes an iron core 111 having an E-shaped cross section.
- a sensor coil 112 is wound around 111 and a permanent magnet 113 is attached to the center of the iron core 111.
- the sensor coil 112 of the electromagnetic sensor 11 is connected to an AC power source (not shown) and a detection circuit (not shown).
- the inspection object 12 is conveyed in the direction of arrow XI in FIG. 1 by the belt 13 and moves under the electromagnetic sensor 11 as shown in FIG.
- an AC power supply is connected to the sensor coil 112
- an AC current flows through the sensor coil 112 to generate an alternating magnetic field.
- a magnetic flux generated in the sensor coil 112 based on the AC magnetic field passes through a magnetic path including the belt 13.
- the magnetic characteristics of the magnetic path of the sensor coil 112 change. Due to the change in the magnetic characteristics, the amplitude of the alternating current of the sensor coil 112 changes. This change in amplitude is extracted by the detection circuit so that it can be inspected. The metal piece mixed with the object 12 is detected.
- the electromagnetic sensor 11 shown in FIGS. 1 to 3 uses one sensor coil 112 as an excitation coil and a detection coil, the sensor coil 112 has a metal piece on the object 12 to be inspected. Current flows even when is not mixed. That is, a detection signal is generated in the detection coil even when a metal piece is not mixed in the inspection object 12. Therefore, in order to detect a metal piece, the amplitude difference between these detection signals is calculated from the detection signal and the two detection signals. It must be extracted as a single detection signal. Therefore, the extraction of the metal piece detection signal requires complicated signal processing using a complicated circuit such as a bridge circuit (balanced circuit), which complicates the metal piece detection device. Further, when the distance (interval) between the object to be inspected 12 and the sensor coil 112 is increased, both detection signals are reduced and the amplitude difference between the two detection signals is also reduced, so that the detection accuracy and detection sensitivity of the metal piece are lowered.
- a bridge circuit balanced circuit
- the electromagnetic sensor 11 when a metal piece is mixed in the inspection object 12, if the distance (distance) between the sensor coil 112 and the inspection object 12 changes, the current of the detection coil also changes. It affects the metal piece detection signal and reduces the detection accuracy and detection sensitivity of the metal piece.
- the change in the distance (distance) between the sensor coil 112 and the object to be inspected 12 is caused by the vertical movement of the position of the sensor coil 112 or the difference in the position of the metal piece mixed in the object to be inspected. Force close to sensor coil 112 is generated due to difference in distant position.
- An object of the present invention is to provide an electromagnetic induction sensor and a metal detection method for a novel metal detection device that can solve the problems of conventional magnetic sensors. Another object of the present invention is to generate a detection signal in the detection coil only when a metal piece is mixed in the object to be inspected, and to inspect the object without performing complicated signal processing using a complicated circuit. An object of the present invention is to provide an electromagnetic induction sensor and a metal detection method of a metal detection device that can detect the presence or absence of a metal piece that is contained in an object.
- An electromagnetic induction sensor of a metal detector includes an excitation coil and a detection coil arranged so that their coil surfaces intersect each other, and the coil surface of the detection coil is in parallel with an object to be inspected. Arrange them in rows.
- the detection coil may be configured by a plurality of coils arranged in parallel!
- the metal detection method includes an excitation coil and a detection coil, and the coil surface of the detection coil of the electromagnetic induction sensor arranged so that the coil surfaces of these coils intersect each other is in parallel with the object to be inspected. Therefore, the electromagnetic induction sensor or the object to be inspected is relatively moved to detect the metal piece of the object to be inspected.
- a detection coil configured by arranging a plurality of coils in parallel may be used.
- the detection coil of the electromagnetic induction sensor to which the present invention is applied generates a metal piece detection signal that is a detection signal only when a metal piece is mixed in the object to be inspected, and when the metal piece is not mixed. Since no detection signal is generated, the metal piece can be detected reliably even when the amplitude of the metal piece detection signal is small. Therefore, the metal piece can be detected with higher accuracy and higher sensitivity than the conventional metal piece detection sensor.
- the extraction circuit for the metal piece detection signal can be easily configured. Since the amplitude of the metal piece detection signal of the electromagnetic induction sensor to which the present invention is applied differs depending on the size of the metal piece, if the type (material) of the metal piece is the same, the amplitude depends on the amplitude of the metal piece detection signal. The size of the metal piece can be estimated. Also, since the phase of the metal piece detection signal is determined by the type (material) of the metal piece that is related to the size of the metal piece, the type (material) of the metal piece can be estimated from the phase of the metal piece detection signal. .
- the fluctuation in the amplitude is related to the determination of the presence or absence of the metal piece. Therefore, the presence / absence of the metal piece is not erroneously determined by the fluctuation of the amplitude of the metal piece detection signal.
- FIG. 1 is a plan view showing a conventional electromagnetic sensor.
- FIG. 2 is a sectional view taken along line II-II in FIG.
- FIG. 3 is a bottom view showing a conventional electromagnetic sensor.
- FIG. 4 is a plan view showing an electromagnetic induction sensor according to the present invention.
- FIG. 5 is a side view showing an electromagnetic induction sensor according to the present invention.
- FIG. 6 is a sectional view taken along line VI-VI in FIG.
- FIG. 7A to FIG. 7F are views for explaining the direction of magnetic flux generated by the exciting coil of the electromagnetic induction sensor according to the present invention and the positional relationship between the metal piece in the inspection object and the detecting coil.
- FIG. 8A, FIG. 8B, and FIG. 8C are diagrams showing test results of the electromagnetic induction sensor according to the present invention.
- FIG. 9 is a plan view showing a bolt used in a test of an electromagnetic induction sensor according to the present invention.
- FIG. 10 is a plan view showing various clips used in the test of the electromagnetic induction sensor according to the present invention.
- FIG. 11 is a plan view showing a staple for a stapler used for testing an electromagnetic induction sensor according to the present invention.
- FIG. 12A, FIG. 12B, and FIG. 12C show an example in which the direction of the winding of the exciting coil of the electromagnetic induction sensor according to the present invention is changed and an example in which the shape of the detection coil is changed.
- FIG. 13A, FIG. 13B, and FIG. 13C show other examples of electromagnetic induction sensors according to the present invention, respectively.
- the electromagnetic induction sensor 20 includes an excitation coil 21 of the electromagnetic induction sensor and a detection coil 22 of the electromagnetic induction sensor, and faces the coils 21 and 22 respectively. In this way, the inspection object 31 is installed.
- the excitation coil 21 constituting the electromagnetic induction sensor 20 is a coil wound in a rectangular shape as shown in FIG. 5, and the detection coil 22 is a pancake shape (doughnut shape) as shown in FIG. It is a coil wound around. That is, the detection coil 22 is formed concentrically.
- the excitation coil 21 and the detection coil 22 constituting the electromagnetic induction sensor 20 are orthogonal to each other, that is, as shown in FIGS. Arranged to intersect. Then, as shown in FIGS. 4 and 5, the exciting coil 21 is installed so that its coil surface is in direct contact with the inspection object 31. Therefore, the coil surface of the detection coil 22 is parallel to the inspection object 31 as shown in FIGS.
- the coil surface is a surface orthogonal to the central axis of each of the exciting coil 21 and the detection coil 22, that is, an opening surface surrounded by a winding.
- 7A to 7F are diagrams for explaining the direction of the magnetic flux generated by the exciting coil 21 and the positional relationship between the metal piece in the inspection object and the detection coil.
- the exciting coil 21 When a current is passed through the exciting coil 21, as shown in FIG. 7A, the exciting coil 21 generates a uniform magnetic field in the direction perpendicular to the coil surface, which is perpendicular to the winding direction, and is parallel to each other. Magnetic flux Mf with the same direction is generated.
- the detection coil 22 is placed in a uniform magnetic field as shown in FIG. 7B. As a result, an electromotive force is induced in the detection coil 22 by the action of the magnetic flux Mf generated by the excitation coil 21.
- the detection coil 22 has left-right symmetrical portions 22L and 22R on both sides of the center line PO parallel to the magnetic flux Mf generated by the excitation coil 21, so that this detection coil 22 is
- the electromotive force induced in the left portion 22L of the detection coil 22 and the electromotive force induced in the right portion 22R are the same in magnitude and direction. Is reversed. Therefore, the electromotive force induced in the left portion 22L of the detection coil 22 and the electromotive force induced in the right portion 22R cancel each other, and no detection signal is generated in the detection coil 22. That is, when no metal piece is present in the uniform magnetic field, no detection signal is generated in the detection coil 22.
- Eddy current i is generated in the metal piece 32 by the magnetic flux Mf generated by the exciting coil 21. Therefore, the spatial magnetic field near the metal piece 32 is affected by the magnetic field generated by the eddy current i, Disturbance occurs in a uniform magnetic field.
- the eddy current i flows in the opposite direction between the front end portion 32a and the rear end portion 32b of the metal piece 32.
- the electromagnetic induction sensor 20 is moved in the direction of arrow Y2 in FIG. 7C with respect to the inspection object 31, and when the detection coil 22 advances to the front end portion 32a of the metal piece 32 as shown in FIG.
- the coil 22 is affected by the magnetic field generated by the eddy current i generated in the metal piece 32, and an electromotive force is induced in the detection coil 22. That is, a metal piece detection signal is generated in the detection coil 22.
- the detection coil 22 is connected to the front end portion 32a and the rear end portion of the metal piece 32. It is affected by the magnetic field generated by the eddy current i of 32b. At this time, since the direction of the eddy current i in the front end portion 32a and the rear end portion 32b of the metal piece 32 is opposite, no detection signal is generated in the detection coil 22.
- the detection coil 22 is generated by the eddy current i generated in the rear end portion 32b of the metal piece 32. Under the influence of the magnetic field, an electromotive force is induced in the detection coil 22. That is, a metal piece detection signal is generated in the detection coil 22. In this case, the polarity of the metal piece detection signal is opposite to that of the metal piece detection signal generated in the detection coil 22 in the state shown in FIG. 7D. As described above, the metal piece detection signal is generated in the detection coil 22 of the electromagnetic induction sensor 20 according to the present invention shown in FIGS.
- the electromagnetic induction sensor 20 has a detection signal when the metal piece 32 is not mixed and a detection signal when the metal piece 32 is mixed, like the conventional electromagnetic sensor described above. There is no need to extract the amplitude difference and extract the metal piece detection signal.
- the metal piece 32 is mixed in the inspection object 31. Since the metal piece detection signal is generated only when the distance (interval) between the detection coil 22 and the metal piece 32 changes and the amplitude of the metal piece detection signal fluctuates, the fluctuation in the amplitude is used to detect the presence or absence of the metal piece Since it is not related, there is no mistake in the determination of the presence or absence of a metal piece.
- the inspection object 31 may be moved instead of moving the electromagnetic induction sensor.
- the electromagnetic induction sensor 20 In the test of the electromagnetic induction sensor 20, the electromagnetic induction sensor 20 according to the present invention was installed on a metal piece, a high frequency signal was applied to the excitation coil 21, the electromagnetic induction sensor 20 was moved, and the electromagnetic induction sensor 20 was guided to the detection coil 22. The voltage was measured. When no metal piece was present, no voltage was induced in the detection coil 22.
- 8A to 8C show the voltage induced in the detection coil 22.
- the horizontal axis represents the in-phase component of the voltage induced in the detection coil (the component in phase with the excitation current), and the vertical axis represents the 90-degree phase advance component (excitation current and 90-degree phase advance component). ).
- 8A to 8C show normalized voltages.
- the metal pieces to be detected by the electromagnetic induction sensor 20 include bolts 51 as shown in FIG. 9, clips 61a, 61b, 61c having different sizes as shown in FIG. 10, and staples as shown in FIG. A needle 71 was used.
- the bolt 51 has a length L1 of about 50 mm, a head diameter W1 of 16 mm, and a screw diameter W2 of 10 mm.
- the clip 6 la has a length L2 of 50 mm, a width W3 of 10 mm, the clip 61b has a length L3 of 28 mm, a width W4 of 8 mm, and the clip 61 c has a length L4 of 2 mm.
- lmm and width W5 is 5mm.
- the stapler needle 71 has a length L5 of 9 mm and a width W6 of lmm.
- the clips 61a, 61b, 61c and the stapler needle 71 are made of the same material, but the bolt 51 is made of a different material.
- Excitation coil 21 has a length (dimension in the direction perpendicular to the central axis of the coil facing the object to be inspected) of 160 mm, a height of 30 mm, and a width (the coil of the part facing the object to be inspected).
- the dimension of the direction parallel to the central axis is 150 mm
- the detection coil 22 Is formed in a size with an outer diameter of 70 mm, a ridge width of 10 mm, and a ridge thickness of 1 mm.
- FIG. 8A shows the metal piece detection signal of the bolt 51 and the metal piece detection signal of the clip 61a.
- the metal piece detection signal of the bolt 51 and the metal piece detection signal of the clip 61a have different amplitudes and different phases.
- FIG. 8B shows a metal piece detection signal of the clips 6 la, 61b, 61c.
- the metal piece detection signals of the clips 6 la, 61b, and 6 lc have smaller amplitudes but the same phase as the dimensions of the clips 61a, 61b, and 61c become smaller. That is, when the size of the metal piece changes, the amplitude of the metal piece detection signal changes, but the phase does not change.
- FIG. 8C shows the metal piece detection signal of the staple 71 for the stapler.
- detection can be performed with high sensitivity as with the force bolt 51 and the clips 61a, 61b, and 6 lc in which the amplitude of the metal piece detection signal is small.
- the phase is the same as that of the clips 61a, 61b, 61c.
- the detection coil generates a metal piece detection signal only when there is a metal piece. Therefore, the metal piece can be reliably detected even when the amplitude is small. It can also be seen that the amplitude of the metal piece detection signal varies depending on the size of the metal piece, but the phase does not change (same). It can be seen that the phase of the metal piece detection signal varies depending on the material of the metal piece. Therefore, when the metal piece material is the same, the size of the metal piece can be estimated from the amplitude of the metal piece detection signal, and the material constituting the metal piece can be estimated from the phase of the metal piece detection signal. can do.
- the winding line of the exciting coil 21 shown in FIG. 12A is wound in the direction perpendicular to the moving direction indicated by the arrow Y2 of the electromagnetic induction sensor 20 in the same manner as the exciting coil 21 shown in FIG.
- the winding of the exciting coil 21 shown in FIG. 12B is wound in a direction parallel to the moving direction indicated by the arrow Y2 of the electromagnetic induction sensor 20. Since the metal piece detection signal may differ depending on the shape and direction of the metal piece mixed in the inspection object, the electromagnetic induction sensor 20 shown in FIG. 12A and the electromagnetic induction sensor 20 shown in FIG. If they are used in parallel, a more stable metal piece detection signal can be obtained.
- the detection coil 22 may be wound in a rectangular shape outside the pancake shape.
- FIG. 13A, FIG. 13B, and FIG. 13C show examples of the electromagnetic induction sensor 120 that can inspect a wide range of an inspection object at a time.
- a plurality of pancake-like detection coils 22 are arranged in parallel in the winding direction of the detection coil 22.
- the electromagnetic induction sensor 120 shown in FIG. 13A can detect the entire width and range of the inspection object 31 at once, and metal pieces are mixed by the detection coil 22 in which the metal piece detection signal is detected! The position can be determined.
- An electromagnetic induction sensor 120 shown in FIG. 13B is an example in which one long rectangular detection coil 22 is used instead of the plurality of detection coils 22 shown in FIG. 13A.
- the electromagnetic induction sensor 120 shown in FIG. 13B is capable of inspecting a wide range of an object to be inspected with a single detection coil 22 and cannot determine the position of a metal piece!
- the electromagnetic induction sensor 120 shown in FIG. 13C is the same as the electromagnetic induction sensor 120 shown in FIG. 13A except that the direction of the winding line of the electromagnetic induction sensor 120 shown in FIG. 13A is different from that of the excitation coil 21.
- the ability to explain some embodiments of the present invention The present invention is not limited to the above-described examples, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.
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JP2004-344964 | 2004-11-29 | ||
JP2004344964A JP2008039394A (ja) | 2004-11-29 | 2004-11-29 | 金属検知装置の電磁誘導センサ |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US8620484B2 (en) | 2010-02-08 | 2013-12-31 | Access Business Group International Llc | Input parasitic metal detection |
CN108415088A (zh) * | 2018-02-09 | 2018-08-17 | 李法利 | 基于金属探测的波形检测方法 |
Families Citing this family (8)
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CN101865954B (zh) * | 2010-06-21 | 2012-11-14 | 天津大学 | 基于电容传感器的信封内危险物品的测量装置及方法 |
JP5668511B2 (ja) * | 2011-02-14 | 2015-02-12 | トヨタ自動車株式会社 | 渦流計測用センサ及び渦流計測方法 |
JP6331012B2 (ja) * | 2014-04-30 | 2018-05-30 | マイクロマグネ有限会社 | 異物検出装置 |
JP6479363B2 (ja) * | 2014-07-31 | 2019-03-06 | グローリー株式会社 | 紙葉類処理装置および紙葉類処理方法 |
WO2017042968A1 (ja) * | 2015-09-11 | 2017-03-16 | グローリー株式会社 | 紙葉類処理装置および紙葉類処理方法 |
JP2017072536A (ja) * | 2015-10-09 | 2017-04-13 | 株式会社Ihi | 導電性複合材料の繊維の配列の乱れの検出方法、及び導電性複合材料の繊維の配列の乱れの検出装置 |
EP3260889B1 (en) * | 2016-06-22 | 2022-10-05 | Mettler-Toledo Safeline Limited | Metal detection apparatus |
CN109752286B (zh) * | 2018-11-20 | 2021-07-13 | 浙江南都电源动力股份有限公司 | 锂离子电池浆料分散均一性在线检测装置及方法 |
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JPH03150401A (ja) * | 1989-07-11 | 1991-06-26 | Nec Corp | 磁気検知器 |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8620484B2 (en) | 2010-02-08 | 2013-12-31 | Access Business Group International Llc | Input parasitic metal detection |
US9524822B2 (en) | 2010-02-08 | 2016-12-20 | Access Business Group International Llc | Input parasitic metal detection |
US10862335B2 (en) | 2010-02-08 | 2020-12-08 | Philips I.P. Ventures B.V. | Input parasitic metal detection |
US11888337B2 (en) | 2010-02-08 | 2024-01-30 | Philips I.P. Ventures B.V. | Input parasitic metal detection |
CN108415088A (zh) * | 2018-02-09 | 2018-08-17 | 李法利 | 基于金属探测的波形检测方法 |
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JP2008039394A (ja) | 2008-02-21 |
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