Modeling of a scan type magnetic camera image using the improved dipole model

Hwang, Jiseong; Lee, Jinyi

doi:10.1007/bf02916273

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…Figure 1 shows the simplified 2D dipole model of the thickness changing on the boiler water-cooled wall tube due to corrosion [21,22]. A U-type magnetizer is placed on the surface of the membrane.…”

Section: Measurement Of Magnetic Flux Densitymentioning

confidence: 99%

“…The corrosion depth and length are d and D/2 + W, respectively. The distance between the magnetizer and the specimen, i.e., lift-off, is expressed as h. Then, the lift-off at the corrosion is h + d. In the dipole model, magnetic charges ±m per unit area are assumed to be distributed along the length of the magnetizer poles, membrane length, and corrosion length according to the assumption in the dipole model [21,22]. The magnetic flux density in the y-axis direction at the position of P(x p ,y p ) is the summary of the magnetic field produced from the magnetic charges, as expressed in Equation (1).…”

Section: Measurement Of Magnetic Flux Densitymentioning

confidence: 99%

“…poles, membrane length, and corrosion length according to the assumption in the dipole model [21,22]. The magnetic flux density in the y-axis direction at the position of P(xp,yp is the summary of the magnetic field produced from the magnetic charges, as expressed in Equation (1).…”

Section: H Y = H Lu + H Ld + H Ru + H Rdmentioning

confidence: 99%

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Measurement of Thinned Water-Cooled Wall in a Circulating Fluidized Bed Boiler Using Ultrasonic and Magnetic Methods

et al. 2021

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In this paper, a nondestructive inspection system is proposed to detect and quantitatively evaluate the size of the near- and far-side damages on the tube, membrane, and weld of the water-cooled wall in the fluidized bed boiler. The shape and size of the surface damages can be evaluated from the magnetic flux density distribution measured by the magnetic sensor array on one side from the center of the magnetizer. The magnetic sensors were arrayed on a curved shape probe according to the tube’s cross-sectional shape, membrane, and weld. On the other hand, the couplant was doped to the water-cooled wall, and a thin film was formed thereon by polyethylene terephthalate. Then, the measured signal of the flexible ultrasonic probe was used to detect and evaluate the depth of the damages. The combination of the magnetic and ultrasonic methods helps to detect and evaluate both near and far-side damages. Near-side damages with a minimum depth of 0.3 mm were detected, and the depth from the surface of the far-side damage was evaluated with a standard deviation of 0.089 mm.

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Section: Measurement Of Magnetic Flux Densitymentioning

confidence: 99%