KR101150486B1 - Apparatus and Method for detecting the wall thinning of pipeline using pulse magnetic field - Google Patents

Apparatus and Method for detecting the wall thinning of pipeline using pulse magnetic field Download PDF

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KR101150486B1
KR101150486B1 KR1020100006915A KR20100006915A KR101150486B1 KR 101150486 B1 KR101150486 B1 KR 101150486B1 KR 1020100006915 A KR1020100006915 A KR 1020100006915A KR 20100006915 A KR20100006915 A KR 20100006915A KR 101150486 B1 KR101150486 B1 KR 101150486B1
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pulse
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thickness
pipe
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KR20110087477A (en
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박덕근
김흥회
정용무
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한국수력원자력 주식회사
한국원자력연구원
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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
    • G01N27/72—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
    • G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
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    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
    • 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
    • G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
    • G01N27/87—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields using probes
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    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C17/00—Monitoring; Testing ; Maintaining
    • G21C17/017—Inspection or maintenance of pipe-lines or tubes in nuclear installations
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E30/30—Nuclear fission reactors

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Abstract

본 발명에 따른 펄스유도자속을 이용한 배관감육 탐상장치는, 펄스자기장을 발생시킴에 따라 배관에 유도되는 펄스유도자속을 자기센서로 측정하여, 상기 배관을 감싸는 절연재 외부에서 상기 배관의 감육 또는 두께변화 검사가 가능하며, 구체적으로, 피검체와 이격되어 비접촉하는 자화요크; 상기 자화요크에 권취되어, 상기 피검체에 펄스자기장을 형성시키는 코일부; 상기 코일부에 전기적으로 연계되어, 상기 코일부에 펄스전원을 공급하는 전원공급부; 상기 자화요크에 설치되며, 상기 펄스자기장에 의해 상기 피검체에 유도되는 펄스유도자속을 탐지하면서 상기 펄스유도자속의 변화를 검출하여 측정신호를 발생시키는 자기센서; 상기 자기센서에서 발생된 상기 측정신호를 수신하여 증폭 및 필터링하는 증폭회로; 및 상기 증폭회로에 의해 증폭 및 필터링된 측정신호를 수신 및 처리하여 상기 피검체의 감육 및 두께변화를 산출하는 신호처리부;를 포함한다.In the pipe thinning flaw detection apparatus using the pulse induction magnetic flux according to the present invention, the pulse induction magnetic flux induced in the pipe as the pulse magnetic field is generated by measuring with a magnetic sensor, the thickness or thickness change of the pipe outside the insulating material surrounding the pipe Inspection is possible, specifically, magnetized yoke that is spaced apart from the subject to contact; A coil unit wound around the magnetizing yoke to form a pulse magnetic field on the subject; A power supply unit electrically connected to the coil unit to supply pulse power to the coil unit; A magnetic sensor installed in the magnetizing yoke and detecting a change in the pulse induction flux while detecting a pulse induction flux induced in the subject by the pulse magnetic field to generate a measurement signal; An amplifier circuit for receiving, amplifying and filtering the measurement signal generated by the magnetic sensor; And a signal processor configured to receive and process a measurement signal amplified and filtered by the amplification circuit to calculate a thickness and a thickness change of the subject.

Description

펄스유도자속을 이용한 배관감육 탐상장치 및 탐상방법{Apparatus and Method for detecting the wall thinning of pipeline using pulse magnetic field}Apparatus and Method for detecting the wall thinning of pipeline using pulse magnetic field}

본 발명은 배관감육 탐상장치로서, 절연재로 감싸진 발전소 배관의 감육을, 절연재를 해체하지 않고 비파괴적으로 검출할 수 있는 펄스유도자속을 이용한 배관감육 탐상장치 및 탐상방법에 관한 것이다.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe thinning flaw detector and a flaw detection method using a pulse induction magnetic flux that can non-destructively detect thinning of power plant piping wrapped with an insulating material without disassembling the insulating material.

현재의 기술은 배관의 감육측정에 초음파를 이용하거나 배관 내부에 보빈형 탐촉자를 삽입하여 펄스와전류로 감육을 측정하는 기술이 고안되었으나, 초음파 기술을 적용하기 위하여는 배관 표면의 보온재를 해체하여 배관 표면에 직접 탐촉자를 부착하여야 한다.Current technology has been devised to measure thinning by pulse and current by using ultrasonic wave to measure the thinning of pipe or by inserting bobbin-type transducer inside the pipe. The transducers shall be attached directly to them.

즉, 기존의 초음파를 이용한 감육평가기술은 열손실을 방지하기 위하여 배관의 표면을 둘러싸고 있는 보온재를 해체한 후, 배관 표면에 직접 탐촉자를 부착하여야 한다.
In other words, conventional thinning evaluation technology using ultrasonic waves has to remove the insulation surrounding the surface of the pipe to prevent heat loss, and then attach the transducer directly to the pipe surface.

또한, 공개특허 10-2006-0010114에 기술되어 있는 보빈형 펄스 와전류는 보빈을 배관 내부로 삽입하여야 하는데, 마모에 의한 두께 변화가 유체와의 접촉에 의해 배관의 내부에서 불규칙하게 발생하는 발전소 배관의 특성상 코일과 마모된 배관의 내면과의 거리가 항상 일정하게 유지되어야 하는 와전류의 기술을 적용하기는 불가능하다.
In addition, the bobbin-type pulse eddy current described in Korean Patent Laid-Open Publication No. 10-2006-0010114 should insert a bobbin into a pipe. In the power plant pipe, a thickness change caused by abrasion occurs irregularly inside the pipe by contact with a fluid. Due to its nature, it is impossible to apply the technique of eddy current, in which the distance between the coil and the inner surface of the worn pipe is always kept constant.

본 발명은 상기와 같은 문제점을 해결하기 위해 창안된 것으로서, 절연재로 감싸진 발전소 배관의 감육을, 절연재를 해체하지 않고 비파괴적으로 검출할 수 있는 펄스유도자속을 이용한 배관감육 탐상장치 및 탐상방법을 제공하는 데에 그 목적이 있다.
The present invention has been made to solve the above problems, the pipe thinning flaw detection apparatus and flaw detection method using a pulse induction flux that can detect the thinning of the power plant piping wrapped with insulating material, without dismantling the insulating material. The purpose is to provide.

상기와 같은 목적을 달성하기 위하여 본 발명의 바람직한 실시예에 따른 펄스유도자속을 이용한 배관감육 탐상장치는, 펄스자기장을 발생시킴에 따라 배관에 유도되는 펄스유도자속을 자기센서로 측정하여, 상기 배관을 감싸는 절연재 외부에서 상기 배관의 감육 또는 두께변화 검사가 가능한 것이다.
In order to achieve the above object, the pipe thinning flaw detection apparatus using the pulse induction magnetic flux according to a preferred embodiment of the present invention, by measuring the pulse induction flux induced in the pipe by generating a magnetic pulse magnetic field, the pipe It is possible to inspect the thickness or thickness change of the pipe from the outside of the insulating material surrounding the pipe.

구체적으로, 본 발명은 피검체와 이격되어 비접촉하는 자화요크; 상기 자화요크에 권취되어, 상기 피검체에 펄스자기장을 형성시키는 코일부; 상기 코일부에 전기적으로 연계되어, 상기 코일부에 펄스전원을 공급하는 전원공급부; 상기 자화요크에 설치되며, 상기 펄스자기장에 의해 상기 피검체에 유도되는 펄스유도자속을 탐지하면서 상기 펄스유도자속의 변화를 검출하여 측정신호를 발생시키는 자기센서; 상기 자기센서에서 발생된 상기 측정신호를 수신하여 증폭 및 필터링하는 증폭회로; 및 상기 증폭회로에 의해 증폭 및 필터링된 측정신호를 수신 및 처리하여 상기 피검체의 감육 및 두께변화를 산출하는 신호처리부;를 포함하여, 상기 피검체의 감육 또는 두께변화의 검사가 상기 피검체를 감싸는 절연재 외부에서 가능하다.
Specifically, the present invention is a magnetized yoke that is spaced apart from the subject to contact; A coil unit wound around the magnetizing yoke to form a pulse magnetic field on the subject; A power supply unit electrically connected to the coil unit to supply pulse power to the coil unit; A magnetic sensor installed in the magnetizing yoke and detecting a change in the pulse induction flux while detecting a pulse induction flux induced in the subject by the pulse magnetic field to generate a measurement signal; An amplifier circuit for receiving, amplifying and filtering the measurement signal generated by the magnetic sensor; And a signal processor configured to receive and process a measurement signal amplified and filtered by the amplification circuit to calculate a thickness and a thickness change of the subject. It is possible outside the wrapping insulation.

또한, 상기 자기센서는, 상기 펄스유도자속의 변화에 의해 변경된 전압을 측정하며, 측정된 상기 전압의 레벨에 따라 상기 피검체의 감육 및 두께변화가 산출되는 것이 바람직하다.The magnetic sensor may measure the voltage changed by the change of the pulse induction flux, and the thickness and thickness change of the subject may be calculated according to the measured level of the voltage.

아울러, 상기 자기센서는 홀자기 센서 또는 GMR(Giant Magnetic Resistance) 센서인 것이 바람직하다.
In addition, the magnetic sensor is preferably a Hall magnetic sensor or a GMR (Giant Magnetic Resistance) sensor.

그리고, 상기 자화요크는 고투자율 재질로서 페라이트(ferrite) 또는 자기강판인 것이 바람직하다.In addition, the magnetization yoke is preferably a ferrite (magnetic) or magnetic steel sheet as a high permeability material.

한편, 상기 신호처리부의 처리는, 상기 측정신호를 제곱하여 적분한 값에 의해 상기 피검체의 감육 및 두께변화가 산출되는 것이 바람직하다.
On the other hand, in the processing of the signal processing unit, it is preferable that the thickness and thickness change of the subject are calculated based on the value obtained by squaring the measurement signal.

여기에서, 상기 피검체는 자성체 또는 비자성체로 이루어진 발전소의 배관인 것이 바람직하다.
Here, it is preferable that the subject is a pipe of a power plant made of a magnetic body or a nonmagnetic body.

본 발명의 다른 측면에 따르면, 자화요크에 권취된 코일부에 펄스전원을 공급하여 펄스자기장을 형성시키는 펄스자기장 형성단계; 상기 펄스자기장에 의해 피검체에 유도된 펄스유도자속을 자기센서로 탐지하는 펄스유도자속 탐지단계; 상기 피검체의 두께차이에 의하여 상기 펄스유도자속에서 변화가 발생되는 경우 상기 자기센서가 측정신호를 발생하는 측정신호 발생단계; 상기 측정신호를 증폭 및 필터링 하는 증폭 및 필터링단계; 및 증폭 및 필터링된 상기 측정신호를 처리하여 상기 피검체의 감육 또는 두께변화를 검출하는 검출단계;를 포함하는 펄스유도자속을 이용한 배관감육 탐상방법이 제공된다.
According to another aspect of the invention, the pulse magnetic field forming step of forming a pulse magnetic field by supplying a pulse power supply to the coil portion wound on the magnetizing yoke; A pulse induction flux detecting step of detecting a pulse induction flux induced in the subject by the pulse magnetic field with a magnetic sensor; A measurement signal generation step of generating a measurement signal by the magnetic sensor when a change in the pulse induction flux occurs due to a difference in thickness of the subject; An amplifying and filtering step of amplifying and filtering the measured signal; And a detecting step of detecting the thinning or the thickness change of the subject by processing the amplified and filtered measurement signal.

이때, 본 발명은, 증폭 및 필터링된 상기 측정신호를 신호처리기법에 의해 푸리에 변환하여 상기 피검체의 감육 또는 두께변화를 평가하는 단계;를 더 포함할 수 있다.
In this case, the present invention may further include a step of Fourier transforming the amplified and filtered measurement signal by a signal processing technique to evaluate the thickness or thickness change of the subject.

본 발명에 따른 펄스유도자속을 이용한 배관감육 탐상장치 및 탐상방법은, 펄스폭이 짧은 펄스전류를 코일부에 인가하여 발생하는 펄스자기장으로 금속인 배관에 펄스유도자속을 유도되게 하여, 상기 펄스유도자속을 자기센서를 이용하여 측정함으로써, 배관의 두께변화와 결함을 디스플레이기 등을 통해 영상화할 수 있다.The pipe thinning flaw detection device and the flaw detection method using the pulse induction magnetic flux according to the present invention, the pulse magnetic field generated by applying a pulse current having a short pulse width to the coil portion to induce the pulse induction flux in the metal pipe, the pulse induction By measuring the magnetic flux using a magnetic sensor, it is possible to image changes in the thickness of the pipe and defects through a display.

이는, 절연재로 감싸진 발전소 배관의 감육을, 절연재를 해체하지 않고 비파괴적으로 평가할 수 있는 효과를 가진다.
This has the effect of nondestructively evaluating the thickness of power plant piping wrapped with an insulating material without dismantling the insulating material.

도 1은 절연재가 부착되어 있는 배관감육을 모사하는 시험편이다.
도 2는 본 발명의 바람직한 실시예에 따른 펄스유도자속을 이용한 배관감육 탐상장치를 나타낸 개략도이다.
도 3은 도 2의 펄스유도자속을 이용한 배관감육 탐상장치에서 자화요크, 코일부, 및 자기센서로 이루어진 탐촉자(probe)를 나타낸 도면이다.
도 4는 도 3의 탐촉자를 나타낸 종단면도이다.
도 5는 도 2의 펄스유도자속을 이용한 배관감육 탐상장치의 작동 및 탐상결과를 나타내는 컴퓨터 화면이다.
도 6은 도 2의 펄스유도자속을 이용한 배관감육 탐상장치를 이용한 탐상방법으로 검출한 시험편의 두께변화에 따른 측정된 전압변화를 나타낸 그래프이다.
도 7은 도 2의 펄스유도자속을 이용한 배관감육 탐상장치를 이용한 탐상방법에서 펄스의 인가된 시간에 따른 펄스전압의 변화를 나타낸 그래프이다.
도 8은 도 2의 펄스유도자속을 이용한 배관감육 탐상장치를 이용한 탐상방법으로 검출한 시험편의 두께변화에 따른 펄스전압의 변화를 나타낸 그래프이다.
도 9는 도 2의 펄스유도자속을 이용한 배관감육 탐상장치를 이용한 탐상방법으로 검출한 시험편의 두께변화에 따른 펄스에너지 변화를 나타낸 그래프이다.
도 10은 도 2의 펄스유도자속을 이용한 배관감육 탐상장치를 이용한 탐상방법으로 검출한 시험편의 두께변화에 따른 전력스펙트럼 밀도변화를 나타낸 그래프이다.BRIEF DESCRIPTION OF THE DRAWINGS The test piece which simulates the piping thinning with an insulating material.
Figure 2 is a schematic diagram showing a pipe thinning flaw detection apparatus using a pulse induction magnetic flux according to a preferred embodiment of the present invention.
FIG. 3 is a view illustrating a probe including a magnetizing yoke, a coil part, and a magnetic sensor in the pipe thinning flaw detector using the pulse induction magnetic flux of FIG. 2.
4 is a longitudinal cross-sectional view illustrating the transducer of FIG. 3.
FIG. 5 is a computer screen illustrating an operation and a flaw detection result of a pipe thinning flaw detection device using the pulse induction flux of FIG. 2.
6 is a graph showing the measured voltage change according to the thickness change of the test piece detected by the flaw detection method using the pipe thinning flaw detection apparatus using the pulse induction magnetic flux of FIG.
FIG. 7 is a graph illustrating a change in pulse voltage according to an applied time of a pulse in a flaw detection method using a pipe thinning flaw detector using the pulse induction flux of FIG. 2.
FIG. 8 is a graph illustrating a change in pulse voltage according to a thickness change of a test piece detected by a flaw detection method using a pipe thinning flaw detection device using the pulse induction magnetic flux of FIG. 2.
FIG. 9 is a graph showing a change in pulse energy according to a change in thickness of a test piece detected by a flaw detection method using a pipe thinning flaw detection device using the pulse guide magnetic flux of FIG. 2.
FIG. 10 is a graph illustrating a change in power spectrum density according to a thickness change of a test piece detected by a flaw detection method using a pipe thinning flaw detection device using the pulse induction magnetic flux of FIG. 2.

본 발명은 펄스자기장을 발생시킴에 따라 배관에 유도되는 펄스유도자속을 자기센서로 측정하여, 배관을 감싸는 절연재 외부에서 배관의 감육 또는 두께변화 검사가 가능한 것을 특징으로 한다.
The present invention is characterized in that by measuring the pulse induction flux induced in the pipe by generating a magnetic magnetic field with a magnetic sensor, it is possible to examine the thinning or thickness change of the pipe outside the insulating material surrounding the pipe.

도 1은 절연재가 부착되어 있는 배관감육을 모사하는 시험편이고, 도 2는 본 발명의 바람직한 실시예에 따른 펄스유도자속을 이용한 배관감육 탐상장치를 나타낸 개략도이다.1 is a test piece that simulates a pipe thinning having an insulating material attached thereto, and FIG. 2 is a schematic view showing a pipe thinning flaw detection device using a pulse induction magnetic flux according to a preferred embodiment of the present invention.

또한, 도 3은 도 2의 펄스유도자속을 이용한 배관감육 탐상장치에서 자화요크, 코일부, 및 자기센서로 이루어진 탐촉자(probe)를 나타낸 도면이고, 도 4는 도 3의 탐촉자를 나타낸 종단면도이다.In addition, Figure 3 is a view showing a probe (probe) consisting of a magnetizing yoke, a coil portion, and a magnetic sensor in the pipe thinning inspection device using the pulse induction flux of Figure 2, Figure 4 is a longitudinal cross-sectional view showing the probe of Figure 3 .

도면을 참조하면, 본 발명은 피검체(1)와 이격되는 자화요크(42), 상기 자화요크(42)에 권취된 코일부(44), 상기 코일부(44)에 펄스전원을 공급하는 전원공급부(20), 상기 자화요크(42)에 설치된 자기센서(46), 및 상기 자기센서(46)에 의한 측정신호를 증폭 및 처리하는 증폭회로(60)와 신호처리부(80)를 포함한다.
Referring to the drawings, the present invention provides a magnetization yoke 42 spaced apart from the subject 1, a coil unit 44 wound around the magnetization yoke 42, a power supply for supplying pulsed power to the coil unit 44 And a supply unit 20, a magnetic sensor 46 installed in the magnetization yoke 42, and an amplification circuit 60 and a signal processing unit 80 for amplifying and processing the measurement signal by the magnetic sensor 46.

상기 자화요크(42)는 피검체(1)와 이격되어 비접촉하도록 구성된다.The magnetizing yoke 42 is configured to be in contact with and spaced apart from the subject 1.

상기 자화요크(42)는 고투자율 재질로서 페라이트(ferrite) 또는 자기강판인 것을 특징으로 하는 펄스유도자속을 이용한 배관감육 탐상장치.
The magnetizing yoke 42 is a thin-walled flaw detection apparatus using a pulse induction magnetic flux, characterized in that the ferrite (magnetic) or magnetic steel plate as a high permeability material.

이때, 상기 피검체(1)는 자성체 또는 비자성체로 이루어진 발전소의 배관인 것으로서, 절연재(2)에 의해 감싸진다.At this time, the test object 1 is a pipe of a power plant made of a magnetic material or a non-magnetic material, and is wrapped by the insulating material 2.

즉, 외부로부터 온도가 전해지는 것을 차단하도록, 배관을 감싸면서 배관의 외면에 부착되어 구성된다.That is, it is attached to the outer surface of the pipe while surrounding the pipe so as to block the transmission of temperature from the outside.

여기에서, 도면에 도시되는 피검체(1)는, 시험편으로서 절연재(2)가 부착된 배관의 감육을 나타낸 것이다.
Here, the test subject 1 shown in the drawing shows the thinning of the pipe with the insulating material 2 attached as the test piece.

또한, 상기 코일부(44)는 자화요크(42)에 권취되어 피검체(1)에 펄스자기장을 형성시킨다.In addition, the coil unit 44 is wound around the magnetizing yoke 42 to form a pulse magnetic field in the subject 1.

여기에서, 상기 전원공급부(20)는 코일부(44)에 펄스전원을 공급하도록, 상기 코일부(44)에 전기적으로 연계되도록 구성된다.
Here, the power supply unit 20 is configured to be electrically connected to the coil unit 44 to supply pulse power to the coil unit 44.

그리고, 상기 자기센서(46)는 자화요크(42)에 설치되며, 자화요크(42)와 코일부(44)에 의해 형성된 상기 펄스자기장에 의해, 피검체(1)에 유도되는 펄스유도자속을 탐지한다.In addition, the magnetic sensor 46 is installed in the magnetization yoke 42, by the pulsed magnetic field formed by the magnetization yoke 42 and the coil portion 44, the pulse induction magnetic flux guided to the subject 1 Detect.

이때, 자기센서(46)는 펄스유도자속의 변화를 검출하여 측정신호를 발생시킨다.
At this time, the magnetic sensor 46 detects a change in the pulse induction flux and generates a measurement signal.

이와 같은 자기센서(46)는, 펄스유도자속의 변화에 의해 변경된 전압을 측정하며, 측정된 상기 전압의 레벨에 따라 후술하는 구성요소에 의해 피검체(1)의 감육 및 두께변화가 산출되도록 한다.The magnetic sensor 46 measures the voltage changed by the change of the pulse induction magnetic flux, and the thickness and thickness change of the subject 1 are calculated by a component described later according to the measured level of the voltage.

이러한 자기센서(46)는, 유도코일 센서, 홀자기 센서 또는 GMR(Giant Magnetic Resistance) 센서인 것이 바람직하다.The magnetic sensor 46 is preferably an induction coil sensor, a Hall magnetic sensor or a Giant Magnetic Resistance (GMR) sensor.

여기에서, 탐촉자(40)는 상기 자화요크(42), 코일부(44), 및 자기센서(46)로 이루어진 조립체를 일컫는다.
Here, the transducer 40 refers to an assembly composed of the magnetizing yoke 42, the coil unit 44, and the magnetic sensor 46.

또한, 상기 증폭회로(60)는 자기센서(46)에서 발생된 측정신호를 수신하여 증폭 및 필터링하는 역할을 한다.In addition, the amplification circuit 60 serves to amplify and filter the measurement signal generated by the magnetic sensor 46.

이에 따라, 증폭회로(60)에 의해 증폭 및 필터링된 측정신호는, 신호처리부(80)에 의해 수신 및 처리하여 피검체(1)의 감육 및 두께변화를 산출한다.Accordingly, the measurement signal amplified and filtered by the amplifying circuit 60 is received and processed by the signal processing unit 80 to calculate the thickness and thickness change of the subject 1.

여기에서, 신호처리부(80)의 처리는, 측정신호를 제곱하여 적분한 값에 의해 피검체(1)의 감육 및 두께변화가 산출되도록 하는 것이다.
Here, the processing of the signal processing unit 80 is such that the weight and thickness change of the subject 1 are calculated based on the value obtained by squaring the measurement signal.

도 5는 도 2의 펄스유도자속을 이용한 배관감육 탐상장치의 작동 및 탐상결과를 나타내는 컴퓨터 화면이며, 도 6은 도 2의 펄스유도자속을 이용한 배관감육 탐상장치를 이용한 탐상방법으로 검출한 시험편의 두께변화에 따른 측정된 전압변화를 나타낸 그래프이고, 도 7은 도 2의 펄스유도자속을 이용한 배관감육 탐상장치를 이용한 탐상방법에서 펄스의 인가된 시간에 따른 펄스전압의 변화를 나타낸 그래프이다.5 is a computer screen showing the operation and inspection results of the pipe thinning flaw detection apparatus using the pulse guide magnetic flux of Figure 2, Figure 6 is a test piece detected by the flaw detection method using the pipe thinning flaw detection apparatus using the pulse guide magnetic flux of Figure 2 Figure 7 is a graph showing the measured voltage change according to the thickness change, Figure 7 is a graph showing the change in the pulse voltage with the time applied of the pulse in the flaw detection method using the pipe thinning flaw detection apparatus using the pulse induction flux of FIG.

그리고, 도 8은 도 2의 펄스유도자속을 이용한 배관감육 탐상장치를 이용한 탐상방법으로 검출한 시험편의 두께변화에 따른 펄스전압의 변화를 나타낸 그래프이며, 도 9는 도 2의 펄스유도자속을 이용한 배관감육 탐상장치를 이용한 탐상방법으로 검출한 시험편의 두께변화에 따른 펄스에너지 변화를 나타낸 그래프이고, 도 10은 도 2의 펄스유도자속을 이용한 배관감육 탐상장치를 이용한 탐상방법으로 검출한 시험편의 두께변화에 따른 전력스펙트럼 밀도변화를 나타낸 그래프이다.8 is a graph showing the change of the pulse voltage according to the thickness change of the test piece detected by the flaw detection method using the pipe thinning flaw detection apparatus using the pulse induction flux of Figure 2, Figure 9 using the pulse induction flux of Figure 2 Fig. 10 is a graph showing the change in pulse energy according to the thickness change of the test piece detected by the flaw detection method using the pipe thinning flaw detection device, and FIG. 10 is the thickness of the test piece detected by the flaw detection method using the pipe thinning flaw detection device using the pulse induction flux of FIG. It is a graph showing the change of power spectrum density according to the change.

도면을 참조하면, 본 발명은 도 5에서와 같이 컴퓨터가 연결되어, 펄스유도자속을 이용한 배관감육 탐상장치의 작동 및 탐상결과를 그 화면에 디스플레이 하면서, 여러 가지에 대한 탐상결과치를 그래프로 나타낼 수 있다.
Referring to the drawings, the present invention can be connected to a computer as shown in Figure 5, while displaying the results of the screening results for various screens while operating and inspecting the results of the pipe thinning flaw detection apparatus using the pulse induction flux on the screen have.

상기와 같이 구성되는 본 발명은 피검체(1)의 감육 또는 두께변화의 검사가 상기 피검체(1)를 감싸는 절연재(2) 외부에서 가능하도록 한다.
The present invention configured as described above allows the inspection of the thickness or thickness change of the inspected object 1 to be possible from the outside of the insulating material 2 surrounding the inspected object 1.

한편, 본 발명에 의한 배관감육 탐상방법을 살펴보기로 한다.On the other hand, the pipe thinning inspection method according to the present invention will be described.

먼저, 자화요크(42)에 권취된 코일부(44)에 펄스전원을 공급하여 펄스자기장을 형성시킨다.First, pulse power is supplied to the coil unit 44 wound around the magnetizing yoke 42 to form a pulse magnetic field.

이어서, 상기 펄스자기장에 의해 피검체(1)에 유도된 펄스유도자속을 자기센서(46)로 탐지한다.
Subsequently, the magnetic sensor 46 detects the pulse induction flux induced in the subject 1 by the pulse magnetic field.

그런 다음, 상기 피검체(1)의 두께차이에 의하여 상기 펄스유도자속에서 변화가 발생되는 경우, 자기센서(46)가 측정신호를 발생한다.Then, when a change occurs in the pulse induction flux due to the thickness difference of the subject 1, the magnetic sensor 46 generates a measurement signal.

다음으로, 증폭회로(60)에 의해 측정신호를 증폭 및 필터링 한다.Next, the amplification circuit 60 amplifies and filters the measurement signal.

마지막으로, 신호처리부(80)가 증폭 및 필터링된 상기 측정신호를 처리하여 피검체(1)의 감육 또는 두께변화를 검출한다.
Finally, the signal processing unit 80 processes the amplified and filtered measurement signal to detect the thickness or thickness change of the subject 1.

이에 더하여, 상기 증폭 및 필터링된 측정신호를 신호처리기법에 의해 푸리에 변환하여 피검체(1)의 감육 또는 두께변화를 평가할 수 있다.
In addition, the amplified and filtered measurement signals may be Fourier transformed by a signal processing technique to evaluate the thickness or thickness change of the subject 1.

결과적으로, 본 발명은 절연재(2)로 감싸진 발전소 배관의 감육을, 절연재(2)를 해체하지 않고 비파괴적으로 평가할 수 있다.As a result, the present invention can non-destructively evaluate the thinning of power plant piping wrapped with the insulating material 2 without dismantling the insulating material 2.

이는 펄스폭이 짧은 펄스전류를 코일부(44)에 인가하여 발생하는 펄스자기장을 밀폐형 자화요크(42)를 사용하여 누설을 최소화하면서, 금속인 배관에 펄스유도자속을 유도되게하여, 상기 펄스유도자속을 자기센서(46)를 이용하여 측정함으로써, 배관의 두께변화와 결함을 디스플레이기 등을 통해 영상화할 수 있다.
This causes the pulse magnetic field generated by applying a pulse current having a short pulse width to the coil unit 44 to induce a pulse induced magnetic flux in a metal pipe while minimizing leakage using the sealed magnetization yoke 42, thereby inducing the pulse induction. By measuring the magnetic flux using the magnetic sensor 46, it is possible to image the thickness change and defects of the pipe through a display or the like.

이상과 같이, 본 발명은 비록 한정된 실시예와 도면에 의해 설명되었으나, 본 발명은 이것에 의해 한정되지 않으며 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해 본 발명의 기술사상과 아래에 기재될 특허청구범위의 균등범위 내에서 다양한 수정 및 변형 가능함은 물론이다.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

1 : 피검체 2 : 절연재
20 : 전원공급부 40 : 탐촉자
42 : 자화요크 44 : 코일부
46 : 자기센서 60 : 증폭회로
80 : 신호처리부1: Subject 2: Insulation Material
20: power supply 40: probe
42: magnetization yoke 44: coil portion
46: magnetic sensor 60: amplification circuit
80: signal processing unit

Claims (9)

삭제delete 피검체와 이격되어 비접촉하는 자화요크;
상기 자화요크에 권취되어, 상기 피검체에 펄스자기장을 형성시키는 코일부;
상기 코일부에 전기적으로 연계되어, 상기 코일부에 펄스전원을 공급하는 전원공급부;
상기 자화요크에 설치되며, 상기 펄스자기장에 의해 상기 피검체에 유도되는 펄스유도자속을 탐지하면서 상기 펄스유도자속의 변화를 검출하여 측정신호를 발생시키는 자기센서;
상기 자기센서에서 발생된 상기 측정신호를 수신하여 증폭 및 필터링하는 증폭회로; 및
상기 증폭회로에 의해 증폭 및 필터링된 측정신호를 수신 및 처리하여 상기 피검체의 감육 및 두께변화를 산출하는 신호처리부;
를 포함하고,
상기 피검체의 감육 또는 두께변화의 검사가 상기 피검체를 감싸는 절연재 외부에서 가능하며,
상기 신호처리부의 처리는, 상기 측정신호를 제곱하여 적분한 값 또는 퓨리에 변환법에 의해 상기 피검체의 감육 및 두께변화가 산출되는 것을 특징으로 하는 펄스유도자속을 이용한 배관감육 탐상장치.
Magnetized yoke that is spaced apart from the subject and is in contact with the subject;
A coil unit wound around the magnetizing yoke to form a pulse magnetic field on the subject;
A power supply unit electrically connected to the coil unit to supply pulse power to the coil unit;
A magnetic sensor installed in the magnetizing yoke and detecting a change in the pulse induction flux while detecting a pulse induction flux induced in the subject by the pulse magnetic field to generate a measurement signal;
An amplifier circuit for receiving, amplifying and filtering the measurement signal generated by the magnetic sensor; And
A signal processor configured to receive and process measurement signals amplified and filtered by the amplification circuit to calculate the thickness and thickness change of the subject;
Including,
Inspection of the thickness or thickness change of the subject is possible outside the insulating material surrounding the subject,
In the processing of the signal processing unit, the thinning and thinning pipe inspection apparatus using the pulse guide magnetic flux, characterized in that the thickness of the measurement signal is squared and the thickness or thickness change of the subject is calculated by a Fourier transform method.
제2항에 있어서,
상기 자기센서는,
상기 펄스유도자속의 변화에 의해 변경된 전압을 측정하며,
측정된 상기 전압의 레벨에 따라 상기 피검체의 감육 및 두께변화가 산출되는 것을 특징으로 하는 펄스유도자속을 이용한 배관감육 탐상장치.
The method of claim 2,
The magnetic sensor,
Measure the voltage changed by the change of the pulse induction flux,
The thinning and thinning pipe inspection apparatus using the pulse induction flux, characterized in that the thickness and thickness change of the subject is calculated according to the measured level of the voltage.
제2항에 있어서,
상기 자기센서는 유도코일 센서, 홀자기 센서 또는 GMR(Giant Magnetic Resistance) 센서인 것을 특징으로 하는 펄스유도자속을 이용한 배관감육 탐상장치.
The method of claim 2,
The magnetic sensor is an induction coil sensor, a Hall magnetic sensor or a GMR (Giant Magnetic Resistance) sensor, the pipe thinning flaw detection apparatus using a pulse induction magnetic flux.
제2항에 있어서,
상기 자화요크는 고투자율 재질로서 페라이트(ferrite) 또는 자기강판인 것을 특징으로 하는 펄스유도자속을 이용한 배관감육 탐상장치.
The method of claim 2,
The magnetizing yoke is a thin-walled flaw detector using a pulse induction magnetic flux, characterized in that the ferrite (magnetic) or magnetic steel sheet as a high permeability material.
삭제delete 제2항에 있어서,
상기 피검체는 자성체 또는 비자성체로 이루어진 발전소의 배관인 것을 특징으로 하는 펄스유도자속을 이용한 배관감육 탐상장치.
The method of claim 2,
Said object is a pipe thinning flaw detection apparatus using a pulse guide magnetic flux, characterized in that the pipe of the power plant consisting of a magnetic material or a non-magnetic material.
자화요크에 권취된 코일부에 펄스전원을 공급하여 펄스자기장을 형성시키는 펄스자기장 형성단계;
상기 펄스자기장에 의해 피검체에 유도된 펄스유도자속을 자기센서로 탐지하는 펄스유도자속 탐지단계;
상기 피검체의 두께차이에 의하여 상기 펄스유도자속에서 변화가 발생되는 경우 상기 자기센서가 측정신호를 발생하는 측정신호 발생단계;
상기 측정신호를 증폭 및 필터링 하는 증폭 및 필터링단계;
증폭 및 필터링된 상기 측정신호를 처리하여 상기 피검체의 감육 또는 두께변화를 검출하는 검출단계; 및
증폭 및 필터링된 상기 측정신호를 신호처리기법에 의해 푸리에 변환하여 상기 피검체의 감육 또는 두께변화를 평가하는 단계;
를 포함하는 펄스유도자속을 이용한 배관감육 탐상방법.
A pulse magnetic field forming step of supplying pulse power to a coil part wound around the magnetizing yoke to form a pulse magnetic field;
A pulse induction flux detecting step of detecting a pulse induction flux induced in the subject by the pulse magnetic field with a magnetic sensor;
A measurement signal generation step of generating a measurement signal by the magnetic sensor when a change in the pulse induction flux occurs due to a difference in thickness of the subject;
An amplifying and filtering step of amplifying and filtering the measured signal;
A detection step of processing the amplified and filtered measurement signal to detect thickness change or thickness change of the subject; And
Evaluating attenuation or thickness change of the subject by Fourier transforming the amplified and filtered measurement signal by a signal processing technique;
Pipe thinning flaw detection method using a pulse induction flux comprising a.
삭제delete
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