KR20170092273A - Non-distructive inspection apparatus using induced electromotive force - Google Patents

Non-distructive inspection apparatus using induced electromotive force Download PDF

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KR20170092273A
KR20170092273A KR1020160013409A KR20160013409A KR20170092273A KR 20170092273 A KR20170092273 A KR 20170092273A KR 1020160013409 A KR1020160013409 A KR 1020160013409A KR 20160013409 A KR20160013409 A KR 20160013409A KR 20170092273 A KR20170092273 A KR 20170092273A
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coil
electromagnetic induction
electromotive force
induced electromotive
induction coil
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KR1020160013409A
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Korean (ko)
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KR101789239B1 (en
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김범기
김국주
박정웅
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(주)라디안이엔씨
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    • 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
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/023—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance where the material is placed in the field of a coil
    • G01N27/025—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance where the material is placed in the field of a coil a current being generated within the material by induction
    • 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
    • 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
    • G01N27/74—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids
    • G01N27/76—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids by investigating susceptibility
    • 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
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • General Physics & Mathematics (AREA)
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  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

A non-destructive testing apparatus using induced electromotive force is disclosed. The non-destructive testing apparatus using the induced electromotive force includes a first electromagnetic induction coil including a first coil and a second coil wound over the first coil, a third coil and a fourth coil superimposed and wound on the third coil A sensor probe for transmitting a magnetic flux line generated from each of the electromagnetic induction coils to a region to be inspected and receiving a flux line returning from the region to be inspected; And a display unit electrically connected to the sensor probe and configured to display information of the received magnetic flux line, wherein the first electromagnetic induction coil and the second electromagnetic induction coil are connected in parallel, and the first coil and the second The first coil and the third coil have the same winding direction, the second coil and the fourth coil have the same winding direction, the third coil and the fourth coil have opposite winding directions, Is the opposite.

Description

[0001] NON-DISTRUCTIVE INSPECTION APPARATUS USING INDUCED ELECTROMOTIVE FORCE [0002]

The present invention relates to a non-destructive testing apparatus, and more particularly, to a non-destructive testing apparatus using an electromotive force induced by a magnetic flux line that is generated differently depending on a physical property difference after inputting a magnetic flux line to an object to be inspected.

Metallic materials are used in various fields. For example, it is used to construct steel structures such as automobiles, ships, plants, civil engineering building structures, and the like.

For example, in case of ship structure, it is very difficult to accurately predict the degree of damages to the load applied to such a ship because the ship is subject to very complicated damage due to various wave loads caused by the natural environment even if the ship is determined. It is very important to accurately predict the damage level of the ship structure and determine the life span of the ship and the time of safety diagnosis, because accidents of the ship can lead to accidents of large human casualties and property damage.

The following non-destructive testing methods can be used to detect defects and damage to steel structures using metal materials.

1. In the case of the radiation nondestructive inspection (RT) method, the principle is to use the difference in the intensity of the transmitted radiation when irradiating the product with transmissive radiation, that is, the difference in the concentration of the film on the basis of the difference in the amount of transmitted light between the dry part and the defective part To check whether the product is defective or not. In the case of this inspection method, only the highly skilled technician can put the radiation itself into the inspection work according to the [National Radiation Dangerous Goods Handling Regulations], and it is difficult to handle and the time and cost are increased. It is not a way.

2. The principle of Ultrasonic Inspection (UT) is to transmit the ultrasound to the product and display the amount of ultrasonic energy reflected from the discontinuity in the inside and the time of the ultrasonic wave to display the CRT screen and analyze the position of the discontinuity It is one of the most widely used non-destructive inspection methods in the world. However, in order to minimize the loss of ultrasound energy, this method should also be applied by applying the gel to the ultrasonic probe, and the data is distorted due to the application amount of the gel, the measurement angle and position of the probe, There are limitations that are difficult to apply to the measurement of ship fatigue.

3. Magnetic Particle Inspection The principle of non-destructive testing (MT) is to magnetize the ferromagnetic material to detect discontinuities (defects) on the surface or surface of the ferromagnetic material and to form the outline of defects , It is possible to measure only the cracks on the surface by inspecting the position, size, shape, and width of the surface.

4. Penetration test The principle of non-destructive testing (PT) is to remove the excess penetrant remaining on the surface of the test specimen without penetrating into the discontinuity (defect) after a sufficient time has elapsed after application of the penetrant onto the surface of the product. And the position of the defect, size, and designation of the defect are detected by sucking the penetrating agent. This method can also measure only defects on the surface of the product, and it is difficult to quantify the data so that it can not be applied to ship fatigue inspection.

5. Eddy current The principle of non-destructive testing (ET) is that when an electric current is brought close to a specimen such as a metal, an eddy current is generated inside the conductor, and the eddy current is changed in size and distribution by the influence of defects or materials. This is an inspection method for measuring cracks or defects on the surface of a test object by measuring the amount of change. However, it is also possible to inspect the surface of the product, but it is impossible to inspect the inside and the deep part of the product.

Therefore, there is a demand for a nondestructive inspection apparatus capable of inspecting not only the surface of a structure using a metal material but also an inner defect.

In order to solve such a conventional problem, the present inventor has proposed a method for measuring the induced electromotive force from a magnetic flux line received after inputting a flux line to an object to be inspected, The inventors have developed a nondestructive inspection apparatus using an induced electromotive force capable of judging a nonuniformity phase existing in the inside.

Published Patent No. 10-2009-0066853

The present invention relates to an electromagnetic induction coil comprising a first electromagnetic induction coil including a first coil and a second coil wound over the first coil, a second electromagnetic induction coil including a third coil and a fourth coil wound over the third coil, A sensor probe for transmitting magnetic flux lines generated from the respective electromagnetic induction coils to a region to be inspected and then receiving a magnetic flux line returning from the region to be inspected; and a sensor probe electrically connected to the sensor probe, Wherein the first electromagnetic induction coil and the second electromagnetic induction coil are placed in parallel on the surface of the inspection object, and the first coil and the second coil have the same winding direction (clockwise direction) , The third coil and the fourth coil are opposite in the winding direction, the first coil and the third coil have the same winding direction, and the second coil and the fourth coil have a winding direction It provides a sensing portion of the non-destructive test apparatus using, an induced electromotive force, characterized in that delivery.

Specifically, the first coil and the third coil are connected in series, and the second coil and the fourth coil are connected in parallel.

The first electromagnetic induction coil and the second electromagnetic induction coil receive the induced electromotive force simultaneously while inputting a magnetic field to the object to be inspected.

This non-destructive instrument includes hardware for adjusting the amplitude (voltage) and intensity (current magnitude) for the magnetic field change.

1 is a conceptual diagram of a nondestructive inspection apparatus using an induced electromotive force according to an embodiment of the present invention.
2 shows a configuration of a sensor probe of a non-destructive testing apparatus using an induced electromotive force according to an embodiment of the present invention.

Hereinafter, a non-destructive testing apparatus using an induced electromotive force according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the present invention in order to clarify the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

FIG. 1 is a conceptual diagram of a nondestructive testing apparatus using an induced electromotive force according to an embodiment of the present invention. FIG. 2 shows a configuration of a sensor probe of a nondestructive testing apparatus using an induced electromotive force according to an embodiment of the present invention.

Referring to FIG. 1, a non-destructive testing apparatus using an induced electromotive force according to an embodiment of the present invention may include a sensor probe 100 and a display unit 200.

Referring to FIG. 2, the sensor probe 100 is for receiving an induced electromotive force after passing a magnetic flux line by a coil to a region to be inspected. The sensor probe 100 may include a first electromagnetic induction coil 110 and a second electromagnetic induction coil 120.

The first electromagnetic induction coil 110 may include a first coil 111 and a second coil 112. The first coil 111 and the second coil 112 are wound in one direction and overlap each other. That is, the second coil 112 is wound on the first coil 111 so as to surround the first coil 111, and overlaps the first coil 111. When a current is applied to the first coil 111 and the second coil 112, a magnetic field is generated in the first electromagnetic induction coil 110, and the generated magnetic field can be input to the object to be inspected.

The second electromagnetic induction coil 120 may include a third coil 121 and a fourth coil 122. The third coil 121 and the fourth coil 122 are wound in one direction and overlap each other. That is, the fourth coil 122 is wound on the third coil 121 so as to surround the third coil 121, and overlaps with the third coil 121. At this time, the winding directions of the third coil 121 and the fourth coil 122 are opposite to each other. For example, the winding direction of the third coil 121 may be a counterclockwise direction, and the winding direction of the fourth coil 122 may be a clockwise direction. When a current is applied to the third coil 121 and the fourth coil 122, a magnetic field is generated in the second electromagnetic induction coil 120, and the generated magnetic field can be input to the object to be inspected.

The first coil 111 and the second coil 112 constituting the first electromagnetic induction coil 110 and the third coil 121 and the fourth coil 122 constituting the second electromagnetic induction coil 120 The winding directions may be the same or different. That is, the winding directions of the first coil 111 and the second coil 112 are equal to each other. For example, the winding directions of the first coil 111 and the second coil 112 may be counterclockwise. The winding directions of the third coil 121 and the fourth coil 122 are opposite to each other. For example, the winding direction of the third coil 121 may be a counterclockwise direction, and the winding direction of the fourth coil 122 may be a clockwise direction. The first coil 111 and the third coil 121 have the same winding direction and the second coil 112 and the fourth coil 122 have opposite winding directions.

Meanwhile, the first electromagnetic induction coil 110 and the second electromagnetic induction coil 120 are connected to each other in parallel. The first coil 111 and the third coil 121 are connected in parallel and the second coil 112 and the fourth coil 122 are connected in parallel.

In this sensor probe 100, magnetic flux lines are generated when electric current is supplied to the first electromagnetic induction coil 110 and the second electromagnetic induction coil 120. In this state, a magnetic flux line is inputted to the object to be inspected while scanning the object to be inspected A magnetic flux line is again received from the object to be inspected. At this time, it is possible to judge whether or not a non-uniform image such as cracks, cavities, fatigue, peeling off of plating exists in the inside and the outside of the object to be inspected according to whether or not an induced electromotive force is generated with respect to the magnetic flux line received from the object to be inspected.

The intensity of the magnetic field generated through the first electromagnetic induction coil 110 and the second electromagnetic induction coil 120 is detected by the first electromagnetic induction coil 110 or the second electromagnetic induction coil 120, Can be adjusted by varying the magnitude of the current applied to the transistor.

The display unit 200 may be electrically connected to the sensor probe 100 and may display information on the magnetic flux lines received by the sensor probe 100. For example, the display unit 200 may display the analyzed information of the received magnetic flux lines obtained from the sensor probe 100 as a graph.

Hereinafter, an inspection process using a non-destructive testing apparatus using an induced electromotive force according to an embodiment of the present invention will be described.

For example, when the object to be inspected is a linear beam and the sensor probe 100 is scanned while moving the sensor probe 100 along the longitudinal direction of the linear beam at a predetermined speed, the sensor probe 100 is moved to the first electromagnetic induction coil 110 And the second electromagnetic induction coil 120. The magnetic flux line may be input to the object to be inspected. The magnetic flux line is received by the sensor probe 100 from the object to be inspected after transmitting the object to be inspected.

If there is no non-uniformity in the inside and the outside of the object to be inspected, the density of the magnetic flux line received from the object to be inspected does not change. In this case, a graph of the density change of the magnetic flux line can be output on the display unit, Can be output in a constant pattern without any change in line density.

When there is a nonuniformity in the inside and the outside of the object to be inspected, a change in the density of the magnetic flux line received from the object to be inspected occurs. That is, the magnetic flux line inputted to the object to be inspected varies in density due to the nonuniform phase present in the object to be inspected. In this case, induced electromotive force is generated by the density change of the magnetic flux line, and the induced electromotive force is input to the sensor probe 100. [ At this time, the induced electromotive force input to the sensor probe 100 is input to the second electromagnetic induction coil 120. In this case, a graph of the density change of the magnetic flux line can be output on the display unit, and a graph of the change in the density of the magnetic flux line, that is, the generation of the induced electromotive force, can be outputted. The output graph can be output in an irregular pattern as the induced electromotive force is input due to the change in the density of the magnetic flux lines.

The non-destructive testing apparatus using the induced electromotive force according to an embodiment of the present invention is configured such that two electromagnetic induction coils are connected in parallel and induction electromotive force is input to one of the two electromagnetic induction coils, It becomes possible to be examined. Thereby, there is an advantage that it is possible to judge a variation in the magnetic flux line, that is, a non-uniformity existing inside the object to be inspected, compared with the conventional method using the eddy current.

The non-destructive testing apparatus using the induced electromotive force according to an embodiment of the present invention can be used in various fields. For example, it can be used for non-destructive inspection of a structure of a ship, and non-destructive inspection of a welded portion.

The description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features presented herein.

Claims (4)

A second electromagnetic induction coil including a first electromagnetic induction coil comprising a first coil and a second coil wound over the first coil, a second electromagnetic induction coil including a third coil and a fourth coil wound over the third coil, A sensor probe for transmitting a magnetic flux line generated from each of the electromagnetic induction coils to a region to be inspected and then receiving a flux line returning from the region to be inspected; And
And a display unit electrically connected to the sensor probe and for displaying information of the received magnetic flux line,
The first electromagnetic induction coil and the second electromagnetic induction coil are placed in parallel,
Wherein the first coil and the second coil have the same winding direction,
The third coil and the fourth coil have opposite winding directions,
The first coil and the third coil have the same winding direction,
Wherein the second coil and the fourth coil have opposite winding directions.
Non - destructive testing system using induced electromotive force. The method according to claim 1,
The first coil and the third coil are connected in series,
And the second coil and the fourth coil are connected in parallel.
Non - destructive testing system using induced electromotive force. The method according to claim 1,
Wherein the first electromagnetic induction coil and the second electromagnetic induction coil input a magnetic field to an object to be inspected,
And the induced electromotive force is input to the second electromagnetic induction coil.
Non - destructive testing system using induced electromotive force. The method according to claim 1,
Wherein the first electromagnetic induction coil and the second electromagnetic induction coil adjust the intensity of the magnetic flux line by changing a magnitude of a current applied to the first electromagnetic induction coil or the second electromagnetic induction coil,
Non - destructive testing system using induced electromotive force.
KR1020160013409A 2016-02-03 2016-02-03 Non-distructive inspection apparatus using induced electromotive force KR101789239B1 (en)

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