KR20020006355A - Coating Weight Measurement System - Google Patents

Coating Weight Measurement System Download PDF

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Publication number
KR20020006355A
KR20020006355A KR1020000039972A KR20000039972A KR20020006355A KR 20020006355 A KR20020006355 A KR 20020006355A KR 1020000039972 A KR1020000039972 A KR 1020000039972A KR 20000039972 A KR20000039972 A KR 20000039972A KR 20020006355 A KR20020006355 A KR 20020006355A
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South Korea
Prior art keywords
sensor
magnetic
magnetic induction
plating amount
power supply
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KR1020000039972A
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Korean (ko)
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김정목
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이구택
포항종합제철 주식회사
신현준
재단법인 포항산업과학연구원
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Priority to KR1020000039972A priority Critical patent/KR20020006355A/en
Publication of KR20020006355A publication Critical patent/KR20020006355A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01B7/105—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 for measuring thickness of coating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/40—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

PURPOSE: A plated amounting measuring device is provided to precisely and simultaneously measure a minimum value, a maximum value, an average value and the like of the plated amount of a non-magnetic material of which a plating layer is ununiform with in a production site, thereby increasing the efficiency of the plating work. CONSTITUTION: A plated amount measuring device includes a sensor part(10) formed of a magnetic induction sensor(14) and a preprocessing unit(12), a main body part(20) formed of a central processing unit(CPU;24), input/output units(26,27), an external interface(28), a display unit(22) and a power supply(25), and a connecting wire(30) for transmission of the power supply and the data signals between the main body part and the sensor part.

Description

도금량 측정장치{Coating Weight Measurement System}Plating Weight Measurement System {Coating Weight Measurement System}

본 발명은 비자성물질의 도금량 측정장치에 관한 것으로서, 보다 상세하게는 코일에 유도되는 자기유도량을 검출하는 자기유도 센서를 이용하여 자성물질에 도금된 비자성물질의 도금량을 측정할 수 있는 장치에 관한 것이다.The present invention relates to an apparatus for measuring the plating amount of a nonmagnetic material, and more particularly, an apparatus capable of measuring a plating amount of a nonmagnetic material plated on a magnetic material by using a magnetic induction sensor for detecting a magnetic induction amount induced in a coil. It is about.

일반적으로, 아연강판과 같은 비철금속 도금강판은 자동차 외판재, 건축자재 등 다양한 용도로 사용되고 있다. 이러한 비철금속 도금강판의 제조방법으로는 전기도금이나 용융도금방법을 이용하여 도금을 실시하고 있다. 이때, 상기 강판상에 정확한 양의 도금을 실시하기 위하여 온라인 도금량측정이 필수적이지만, 현재의 기술로는 도금량이 일정량(230g/m2) 이상인 경우 온라인으로 측정한 값에 많은 오차가 발생하고 있다. 현재 온라인 측정장치로 형광엑스선을 사용하는 방법이 주류를 이루고 있다. 그러나 이러한 형광엑스선을 사용하는 측정방법은 도금량이 작을 경우 정확한 측정이 가능하지만 도금량이 많을 경우는 형광엑스선이 포화되어 정확한 측정이 어려워지는 단점이 있었다. 또한 기존의 자기유도방식을 이용한 측정기는 하나의 측정센서를 사용하고 있기 때문에 평균적인 도금량을 측정하기 힘들고 도금량과 센서의 출력관계를 나타내는 정확한 검량선을 만들지 못하는 단점이 있으며 강판의 두께변화에 따른 와류전류의 영향을 제거하지 못하는 단점이 있었다.In general, non-ferrous metal plated steel sheet such as zinc steel sheet is used for a variety of uses, such as automobile exterior materials, building materials. As a method of manufacturing such a nonferrous metal plated steel sheet, plating is performed using an electroplating or a hot dip plating method. In this case, in order to perform an accurate amount of plating on the steel sheet, online plating amount measurement is essential, but in the current technology, when the plating amount is more than a predetermined amount (230 g / m 2 ), many errors occur in the value measured online. Currently, the use of fluorescent X-rays as the online measuring device is the mainstream. However, the measurement method using the fluorescent X-rays has the disadvantage that accurate measurement is possible when the plating amount is small, but when the coating amount is large, the fluorescent X-rays are saturated, making accurate measurement difficult. In addition, the conventional magnetic induction measuring device has a disadvantage in that it is difficult to measure the average coating amount because it uses one measuring sensor, and it is impossible to make an accurate calibration curve indicating the output relationship between the coating amount and the sensor. There was a drawback of not being able to eliminate the effect of the

본 발명은 상기한 문제점을 해결하기 위하여 안출된 것으로서, 복수의 자기유도센서로부터 측정된 데이터를 가공하여 비자성물질의 정확한 도금량을 산출함으로써, 도금의 품질을 신속하고 정확하게 판단할 수 있을 뿐만 아니라 이동이나 휴대가 가능하도록 한 도금량 측정장치를 제공함에 그 목적이 있다.The present invention has been made to solve the above problems, by processing the data measured from a plurality of magnetic induction sensors to calculate the exact coating amount of the non-magnetic material, it is possible to quickly and accurately determine the quality of the plating as well as to move Another object of the present invention is to provide a plating amount measuring apparatus that is portable.

도 1은 본 발명에 따른 자기유도방식 센서의 측정원리를 나타낸 단면도 .1 is a cross-sectional view showing a measuring principle of a magnetic induction sensor according to the present invention.

도 2은 본 발명에 따른 도금량 측정장치의 개략적인 구성을 나타내는 블록도.2 is a block diagram showing a schematic configuration of a plating amount measuring apparatus according to the present invention.

도 3은 본 발명에 의한 실시예로서 아연도금량에 따른 자기유도센서의 출력값을 나타낸 도면.3 is a view showing the output value of the magnetic induction sensor according to the zinc plating amount as an embodiment according to the present invention.

도 4는 도3의 실시예에 있어서, 강판두께 변화에 따른 센서의 출력변화를 나타낸 도면.4 is a view showing a change in output of the sensor according to the steel sheet thickness change in the embodiment of FIG.

도면의 주요 부분에 대한 부호의 설명Explanation of symbols for the main parts of the drawings

4 : 아날로그프리엠프 6 : A/D변환기4: analog preamp 6: A / D converter

8 : 드라이빙소스 10 : 센서부8: driving source 10: sensor

12 : 전처리장치 14 : 자기유도센서12: pretreatment device 14: magnetic induction sensor

20 : 본체부 22 : 디스플레이장치20: main body 22: display device

24 : 중앙처리장치(CPU) 25 : 전원장치24: central processing unit (CPU) 25: power supply

26 : 입력장치 27 : 출력장치26: input device 27: output device

28 : 외부인터페이스장치 40 : 차동증폭기28: external interface device 40: differential amplifier

50 : 연자성 코아 52,52' : 2차 코일50: soft magnetic core 52,52 ': secondary coil

54 : 1차 코일 60 : 전원54: primary coil 60: power supply

본 발명은 상기와 같은 목적을 달성하기 위해서 다음과 같이 구성된다. 즉, 본 발명은 복수의 자기유도센서와 상기 자기유도센서의 출력신호를 증폭하고 디지털 값으로 변환하는 전처리장치로 구성되는 센서부와; 중앙처리장치(CPU)와,입력장치와,출력장치와,디스플레이장치와,외부인터페이스장치 및 전원장치로 구성되는 본체부와; 상기 센서부에 전원을 공급하고 상기 센서부로부터 디지털 신호를 전달하는 역할을 하는 연결선으로 구성되어 있다.The present invention is configured as follows to achieve the above object. That is, the present invention includes a sensor unit comprising a plurality of magnetic induction sensors and a preprocessing device for amplifying and converting the output signals of the magnetic induction sensors into digital values; A main body comprising a central processing unit (CPU), an input device, an output device, a display device, an external interface device, and a power supply device; It is composed of a connecting line that serves to supply power to the sensor unit and to transmit a digital signal from the sensor unit.

이하, 본 발명의 바람직한 실시예를 첨부도면에 의거 상세히 설명한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

첨부된 도면에서, 도 1은 본 발명에 따른 자기유도센서의 측정원리를 보여주는 도면으로서 이를 참조하면 자성물질(72)의 상부에 도금된 비자성물질(71)에는 연자성 코아(50)의 저면이 접속되어 있고 상기 연자성 코아(50)의 중앙부에는 1차코일(54)이 권선되어 있으며 이의 양 끝단에는 전원(60)과 연결되어 있다. 한편, 상기 연자성 코아(50)의 양단에는 2차코일(52,52')이 권선되어 차동증폭기(40)와 연결되어 있으며 나머지 양 끝단은 접지되어 있다.In the accompanying drawings, Figure 1 is a view showing the measuring principle of the magnetic induction sensor according to the present invention referring to the bottom surface of the soft magnetic core 50 in the non-magnetic material 71 plated on the magnetic material 72 The primary coil 54 is wound around the center of the soft magnetic core 50, and is connected to the power supply 60 at both ends thereof. On the other hand, secondary coils 52 and 52 'are wound around both ends of the soft magnetic core 50 and are connected to the differential amplifier 40, and both ends of the soft magnetic core 50 are grounded.

일단, 전원(60)에 저주파 교류전압을 인가하면 1차코일(54)에서는 자기가 발생되고, 이로 인해 연자성 코아(50)에 감겨져 있는 2차 코일(52,52')에 유도전압이발생하게 된다. 여기서, 외부의 영향이 배제된다면 상기 2개의 2차코일(52,52')에는 같은 기전력이 발생하게 되는데, 만약 상기 연자성 코아(50)의 일측에 자속을 모아줄 수 있는 자성물질(72)이 접근하게 되면 상기 연자성코아(50)에는 상기 자성물질(72)이 접근된 방향으로 자속이 집속하게 된다. 따라서 그 방면의 2차코일(52')에는 다른 방면의 2차코일(52)보다 상대적으로 높은 기전력이 유도되고 이와 연결된 차동증폭기(40)를 통해 상기 2개의 2차코일(52,52')의 기전력의 차를 측정함으로써 상기 자성물질(72)의 접근 정도, 즉 상기 자성물질(72)과의 거리 또는 도금두께를 알 수 있기 때문에 결과적으로 비자성물질(71)의 도금량을 측정할 수 있게 되는 것이다.Once a low frequency AC voltage is applied to the power supply 60, magnetism is generated in the primary coil 54, which causes induction voltage in the secondary coils 52 and 52 ′ wound around the soft magnetic core 50. Done. Here, if the external influence is excluded, the same electromotive force is generated in the two secondary coils 52 and 52 '. If the magnetic material 72 can collect magnetic flux on one side of the soft magnetic core 50, When the approach is made, the magnetic flux is focused on the soft magnetic core 50 in the direction in which the magnetic material 72 approaches. Accordingly, the secondary coils 52 'in the direction are induced with a relatively higher electromotive force than the secondary coils 52 in the other direction and are connected to the two secondary coils 52 and 52' through the differential amplifier 40 connected thereto. By measuring the difference in electromotive force of the magnetic material 72, that is, the distance to the magnetic material 72 or the plating thickness can be known, so that the plating amount of the non-magnetic material 71 can be measured as a result. Will be.

도2는 상술한 자기유도방식의 유도자기센서가 사용되는 도금량 측정장치의 개략적인 구성을 나타내는 도면으로, 크게는 센서부(10)와 본체부(20)와 이를 연결하는 연결부(30)로 구성되어 있다. 여기서 센서부(10)는 16개의 자기유도센서(14)와 아날로그프리엠프(4), A/D변환기(6), 드라이빙소스(8)가 구비되는 전처리장치(12)로 구성되어 있고, 본체부(20)는 중앙처리장치(CPU)(24)와 입출력장치(26,27), 디스플레이장치(22), 외부인터페이스장치(28) 및 전원장치(25)로 이루어져 있다.2 is a view showing a schematic configuration of a plating amount measuring apparatus using the inductive magnetic sensor of the above-described magnetic induction method, largely composed of the sensor unit 10 and the main body 20 and the connecting portion 30 connecting them. It is. Here, the sensor unit 10 includes 16 magnetic induction sensors 14, an analog preamplifier 4, an A / D converter 6, and a preprocessing device 12 equipped with a driving source 8. The unit 20 includes a central processing unit (CPU) 24, input / output devices 26 and 27, a display device 22, an external interface device 28, and a power supply device 25.

비자성물질(71)의 정확한 도금량측정을 위해서는 먼저 측정하고자 하는 비자성물질(71)에 알맞은 검량선을 설정하는 작업이 선행된다.(예를들어 아연도금일 경우 0~500g/m2에서 최고의 정확도를 나타내도록 검량선을 설정)In order to accurately measure the coating amount of the nonmagnetic material 71, the first step is to set a calibration curve suitable for the nonmagnetic material 71 to be measured (for example, in the case of zinc plating, the highest accuracy at 0 to 500 g / m 2) . Set the calibration curve to indicate

일단, 자성물질(72) 상부에 도금된 비자성물질(71)의 도금량을 측정하고자할 경우, 자기유도센서(14)를 상기 비자성물질(71)의 상부면에 접촉시키면 상술한 자기유도방식에 따라 비자성물질(71)의 두께에 해당되는 유도자기량이 검출되어진다. 여기서 아날로그 멀티플렉스의 입력수(포트)와 같은 하드웨어적인 측면과 측정값의 정확도 등을 고려하여 16개의 자기유도센서(14)를 사용하게 된다.Once, in order to measure the plating amount of the nonmagnetic material 71 plated on the magnetic material 72, the magnetic induction sensor 14 is in contact with the upper surface of the nonmagnetic material 71 described above. As a result, the amount of induction magnetic field corresponding to the thickness of the nonmagnetic material 71 is detected. Here, 16 magnetic induction sensors 14 are used in consideration of hardware aspects such as the number of inputs (ports) of the analog multiplex and accuracy of measured values.

한편 전처리장치(12)에서는 상기 16개의 유도자기센서(14)들로부터 검출된 아날로그신호가 아날로그 프리엠프(4)에 의해 증폭되어지며, 상기 증폭된 아날로그신호는 다시 A/D변환기(6)에 의해 디지털신호로 변환된다. 이때, 자성물질(72)의 판두께에 대한 측정오차를 최소화하기 위하여 상기 자성물질(72)의 판 두께가 일정범위(아연도금강판일 경우 0.2 ~ 2mm)에서 사용될 수 있도록 드라이빙소스(8)의 사용주파수를 적절하게 조정하게 된다. 참고로, 도3 아연도금강판에서 아연의 도금량에 따른 자기유도센서(14)의 출력특성을 나타낸 것이고, 도4는 드라이빙소스(8)의 주파수가 일정할 때 강판의 두께변화에 대한 측정값의 변화를 나타낸 것이다.Meanwhile, in the preprocessor 12, the analog signals detected from the 16 induction magnetic sensors 14 are amplified by the analog preamplifier 4, and the amplified analog signals are again supplied to the A / D converter 6. Is converted into a digital signal. At this time, in order to minimize the measurement error of the plate thickness of the magnetic material 72, the thickness of the magnetic material 72 can be used in a certain range (0.2 ~ 2mm in the case of galvanized steel sheet) of the driving source 8 Adjust the operating frequency accordingly. For reference, Figure 3 shows the output characteristics of the magnetic induction sensor 14 according to the zinc plating amount in the galvanized steel sheet, Figure 4 shows the measured value of the thickness change of the steel sheet when the frequency of the driving source 8 is constant It is a change.

한편, 센서부(10)로부터 출력된 디지털신호는 연결선(30)에 의해 본체부(20)로 전달되며, 상기 본체내(20)의 중앙처리장치(CPU)(24)의 연산작업에 의해 최대치,최소치,평균치의 값들로 산출되어진다. 상기 중앙처리장치(CPU)(24)는 상기 센서부(10)로부터 전달된 디지털데이터의 입/출력제어를 비롯하여 이밖에 측정하고자 하는 비자성물질(71)에 알맞은 검량선 설정을 위한 검량선설정용 알고리듬의 구현, 도금량계산과 같은 연산작업 및 외부장치의 제어를 수행하게 된다. 상기 연산 결과 산출된 데이터값은 디스플레이장치(22)를 통해 결과치를 사용자가 판단할 수 있도록 액정화면상에 표시되고, 외부인터페이스장치(28)에 의해 외부컴퓨터에 전송되거나 반대로 외부컴퓨터로부터 검량선설정 및 연산알고리듬 등과 같은 소프트웨어를 전송받게 된다. 한편 입력장치(26)에서는 사용자가 키를 누르는 작업에 의해서 상기 본체부(20)의 중앙처리장치로(CPU)(24)로 명령을 전달할 수 있게 되고, 상기 중앙처리장치(CPU)(24)의 연산작업에 의해 산출된 테이터값을 출력장치(27)에 의해 화면 또는 프린터로 출력할 수 있게 된다.On the other hand, the digital signal output from the sensor unit 10 is transmitted to the main body 20 by the connecting line 30, the maximum value by the calculation operation of the CPU 24 of the main body 20 Calculated as the minimum, average value. The central processing unit (CPU) 24 includes an input / output control of digital data transmitted from the sensor unit 10, and an calibration curve setting algorithm for setting calibration curves suitable for the nonmagnetic material 71 to be measured. The implementation of arithmetic operations, such as calculation of plating amount and control of external devices. The data value calculated as a result of the calculation is displayed on the LCD screen so that the user can determine the result value through the display device 22, and is transmitted to the external computer by the external interface device 28 or vice versa. Software such as algorithm is received. On the other hand, in the input device 26, the user can transmit a command to the central processing unit (CPU) 24 of the main body 20 by the operation of pressing a key, the central processing unit (CPU) 24 It is possible to output the data value calculated by the calculation operation of the output device 27 to the screen or a printer.

한편, 본체부(20)의 전원공급은 상기 본체내의 전원장치(25)를 통해서 이루어지는데, 케이블을 통하여 외부로부터 전원을 공급 받거나 또는 충전식으로 겸용할 수 있다.On the other hand, the power supply of the main body 20 is made through the power supply device 25 in the main body, can be supplied with power from the outside through a cable or can be used as a rechargeable.

이상에서와 같은 도금량 측정장치는 휴대가 가능하고 또한 이동하면서 측정할 수 있기 때문에 작업현장에서 신속하고 간편하게 비자성물질의 도금량을 측정할 수 있다. 또한 이를 위해 본체부(20)에 소정의 어깨걸이 수단이 구비될 수도 있다.Since the plating amount measuring device as described above is portable and can be measured while moving, it is possible to quickly and easily measure the plating amount of the nonmagnetic material at the work site. In addition, a predetermined shawl means may be provided in the main body 20 for this purpose.

본 발명은 전술한 실시 예에 국한되지 않고 본 발명의 기술 사상이 허용하는 범위 내에서 다양하게 변형하여 실시할 수가 있다.The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

이상과 같이 본 발명은 다수의 자기유도방식의 센서를 사용하여 도금층이 불균일한 비자성물질의 도금량을 최소치, 최대치, 평균치의 다양한 값으로 신속하고 동시에 정확하게 측정할 수 있기 때문에, 생산현장에서 사용할 경우 정확한 도금량을 현장에 신속하게 전달할 수 있어 작업의 효율을 증대 시킬 수 있고, 또한, 생산라인에서 온라인으로 도금량을 측정할 수 있어 제품의 품질을 판단할 수 있으며 과량의 도금으로 인한 원가의 손실이나 도금량 미달로 인한 제품의 불량을 최소화 할수 있다.As described above, the present invention can quickly and accurately measure the coating amount of non-magnetic material having a non-uniform coating layer with various values of the minimum, maximum, and average values by using a plurality of magnetic induction sensors. It is possible to deliver accurate plating amount on-site quickly to increase the work efficiency. Also, it is possible to measure the plating amount online on the production line to judge the quality of the product. Loss of cost or plating amount due to excessive plating It can minimize the defect of the product due to under.

Claims (4)

자성물질에 도금된 비자성물질의 도금량 측정장치에 있어서,In the plating amount measuring apparatus of a non-magnetic material plated on a magnetic material, 자기유도센서와 전처리장치로 구성되는 센서부와;A sensor unit comprising a magnetic induction sensor and a pretreatment device; 중앙처리장치(CPU), 입출력장치, 외부인터페이스, 디스플레이장치, 전원장치로 구성되는 본체부와;A main body unit including a central processing unit (CPU), an input / output device, an external interface, a display device, and a power supply device; 상기 본체부와 센서부 사이의 전원공급 및 데이터 신호가 전달되는 연결선으로 구성되는 것을 특징으로 하는 도금량 측정장치.Plating amount measuring device characterized in that consisting of a connecting line for transmitting the power supply and data signals between the main body and the sensor unit. 제 1항에 있어서, 자기유도센서는 자성물질 상부에 도금된 비자성물질에 저면이 접속되고 중앙부에 전원에 연결된 코일이 권선되며 양단에 코일이 권선되어 있는 연자성코아와, 상기 연자성코아 양단에 권선된 코일에 연결된 차동증폭기로 구성됨을 특징으로 하는 도금량 측정장치.The magnetic induction sensor of claim 1, wherein the magnetic induction sensor has a soft magnetic core having a bottom connected to a non-magnetic material plated on a magnetic material, a coil connected to a power supply at a central portion thereof, and a coil wound at both ends thereof, and both ends of the soft magnetic core. Plating amount measuring device, characterized in that consisting of a differential amplifier connected to the coil wound on. 제 1항에 있어서, 센서부는 16개의 자기유도센서와 아날로그프리엠프와 A/D변환기와 드라이빙소스로 구성되는 것을 특징으로 하는 도금량 측정장치.The plating amount measuring apparatus of claim 1, wherein the sensor unit comprises 16 magnetic induction sensors, an analog preamp, an A / D converter, and a driving source. 제 1항에 있어서, 중앙처리장치는 상기 자기유도센서로부터 측정된 데이터 값의 평균값, 최대값, 최소값을 산출하는 것을 특징으로 하는 도금량 측정장치.The plating amount measuring apparatus of claim 1, wherein the central processing unit calculates an average value, a maximum value, and a minimum value of data values measured by the magnetic induction sensor.
KR1020000039972A 2000-07-12 2000-07-12 Coating Weight Measurement System KR20020006355A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6138503A (en) * 1984-07-31 1986-02-24 Ketsuto Kagaku Kenkyusho:Kk Film thickness gauge
JPH04248408A (en) * 1991-02-01 1992-09-03 Nkk Corp Measuring method for thickness of coating film
JPH07332916A (en) * 1994-06-13 1995-12-22 Ket Kagaku Kenkyusho:Kk Film thickness meter
JPH08320201A (en) * 1995-05-24 1996-12-03 Ket Kagaku Kenkyusho:Kk Apparatus for measurement of film thickness with lowered drift by temperature
KR19980051093A (en) * 1996-12-23 1998-09-15 김종진 Non-magnetic material plating amount measuring device on top of magnetic material
KR100381095B1 (en) * 1998-10-10 2003-07-16 주식회사 포스코 Method of measuring thickness of zinc plating by magnetic induction method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6138503A (en) * 1984-07-31 1986-02-24 Ketsuto Kagaku Kenkyusho:Kk Film thickness gauge
JPH04248408A (en) * 1991-02-01 1992-09-03 Nkk Corp Measuring method for thickness of coating film
JPH07332916A (en) * 1994-06-13 1995-12-22 Ket Kagaku Kenkyusho:Kk Film thickness meter
JPH08320201A (en) * 1995-05-24 1996-12-03 Ket Kagaku Kenkyusho:Kk Apparatus for measurement of film thickness with lowered drift by temperature
KR19980051093A (en) * 1996-12-23 1998-09-15 김종진 Non-magnetic material plating amount measuring device on top of magnetic material
KR100381095B1 (en) * 1998-10-10 2003-07-16 주식회사 포스코 Method of measuring thickness of zinc plating by magnetic induction method

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