Development of Signal Processing Circuit of a Magnetic Camera for the NDT of a Paramagnetic Material

Jun, Jong Woo; Hwang, Ji Seong; Kim, Kee Joo; Ogawa, Kōichi; Lee, Jin Yi

doi:10.4028/0-87849-456-1.2379

Cited by 2 publications

(2 citation statements)

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“…The distribution of the magnetic field can be measured quantitatively; then, the crack can be evaluated with a scan type magnetic camera [10]. On the other hand, a type of area magnetic camera using a Hall sensor array (HSA) has merit; that is, a crack can be detected with high speed without sensor scanning.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive evaluation of a crack on austenitic stainless steel using a sheet type induced current and a Hall sensor array

Jun

Lee

2008

J Mech Sci Technol

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Austenitic stainless steels (hereafter A-STS) such as STS304 and STS316 are paramagnetic metals. However, a small amount of partial magnetization is generated in A-STS because of the imperfect final heat treatment and mechanical processing. Surface cracks on paramagnetic metal with a partially magnetized region (hereafter PMR) are difficult to inspect. In this paper, we propose a method for high speed inspection and evaluation of a crack on A-STS. Cracks can be inspected with high speed by using 64 arrayed Hall sensors (HSA) with 3.5 mm spatial resolution and a sheet type induced current (STIC). Then, a crack can be evaluated quantitatively by using the detailed distribution of the magnetic field obtained by using single Hall sensor scanning (SSS) around the inspected crack area. Several cracks on A-STS with partially magnetized areas were examined and the experimental formulas were derived.

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Section: Introductionmentioning

confidence: 99%

Nondestructive evaluation of a crack on austenitic stainless steel using a sheet type induced current and a Hall sensor array

Jun

Lee

2008

J Mech Sci Technol

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“…This study proposes the use of a magnetic camera [1]- [4] that can automatically separate coins and identify their legitimacy based upon a given criteria. The simultaneous excitation of induced current and magnetic flux leakage known as the Complex Induced Current-Magnetic Flux Leakage (CIC-MFL) [5]- [6] method was applied as the magnetic source [7].…”

Section: Introductionmentioning

confidence: 99%

The Discrimination of Metallic Coins Using a Scan Type Magnetic Camera

Jun

Lee

2010

2010 Fifth IEEE International Symposium on Electronic Design, Test &Amp; Applications

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Coins from different countries having similar sizes and weights could be used in a crime because they may have a large difference in economic value. An algorithm, which can be used to discriminate these coins, employs a scanning magnetic camera, which uses a linearly integrated 64 InSb Hall sensor array (LIHaS) on a NiZn ferrite wafer and a complex induced current-magnetic flux leakage method (CIC-MFL). The coins consist of paramagnetic metals or magnetically combined metals. The distribution of the magnetic field around each coin was measured at a lift-off of 1mm, and processed by using the V RMS / x term. It is possible to apply the peak-distances and the integrated absolute minimum values of V RMS / x in order to discriminate the coins. 170 cases that used 85 coins of 43 different denominations from 10 countries were examined to verify the proposed algorithm. The discrimination probability was 90.7 %.

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Development of Signal Processing Circuit of a Magnetic Camera for the NDT of a Paramagnetic Material

Cited by 2 publications

References 0 publications

Nondestructive evaluation of a crack on austenitic stainless steel using a sheet type induced current and a Hall sensor array

Nondestructive evaluation of a crack on austenitic stainless steel using a sheet type induced current and a Hall sensor array

The Discrimination of Metallic Coins Using a Scan Type Magnetic Camera

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