Artifact reduction in non-destructive testing by means of complementary data fusion of x-ray computed tomography and ultrasonic pulse-echo testing

Schrapp, Michael; Scharrer, Thomas; Goldammer, Matthias; Rupitsch, Stefan J.; Sutor, Alexander; Ermert, H.; Lerch, Reinhard

doi:10.1088/0957-0233/24/12/125403

Cited by 12 publications

(7 citation statements)

References 37 publications

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“…A coupling agent is usually necessary, which is difficult to adapt to in-process practices. The radiography equipment used in optical testing makes such an approach a relatively complex and expensive method, during which it is difficult to quantify the defect assessment due to the existence of the oxide layer [8][9][10]. Due to the presence of a skin and lift-off effects, it is difficult for the accuracy of the excitation coil and detection coil in eddy current testing to reach 1 mm or less; as a result, the ability to detect small defects is severely limited [11][12][13].…”

Section: Measurement Science and Technologymentioning

confidence: 99%

A magnetostatic force inspection method for monitoring the oscillation marks of continuous casting

Chen¹,

Wang²,

Ren³

et al. 2015

Meas. Sci. Technol.

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Based on the well-known fact that ferromagnetic materials can be significantly attracted by a permanent magnet (PM), we develop an innovative magnetostatic force inspection method to monitor the oscillating marks formed during continuous casting. A small PM produces a static magnetic field that penetrates into the ferromagnetic material slab formed via continuous casting. This magnet forms a localized magnetic sensing zone (MSZ) within the ferromagnetic material. The magnetostatic force acting on the ferromagnetic material can be expressed as the Maxwell tensor integral over the surface of the ferromagnetic material within the MSZ. This force provides local surface profile information. The reaction force of the magnetostatic force acting on the PM can be measured using a laser-cantilever system (a high force resolution method), and thus the profile features of the oscillation marks can be obtained. A measuring device with a laser-cantilever system is designed, constructed, and applied in a series of prototypes and a static experiment. A numerical model is simultaneously constructed to validate the measurement results. The differences between the actual and measured profiles are analyzed. An actual steel specimen with oscillation marks is measured using this device, and the accuracy is evaluated. In summary, the potential for the application of this method in the metallurgy industry is demonstrated.

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Section: Measurement Science and Technologymentioning

confidence: 99%

A magnetostatic force inspection method for monitoring the oscillation marks of continuous casting

Chen¹,

Wang²,

Ren³

et al. 2015

Meas. Sci. Technol.

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“…In further studies, a combination of other measurement methods beyond FP (e.g. ultrasound, focal microscopy) was investigated, although, the focus was not on surface geometry determination [17][18][19][20]. This paper advances the state of the art presented in [4,[8][9][10][11][15][16][17][18][19][20] by:…”

Section: Introductionmentioning

confidence: 99%

Adaptive surface geometry determination in multi-material x-ray computed tomography using fringe projection

Großeheide¹,

Geiger²,

Schmidt³

et al. 2022

Meas. Sci. Technol.

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One of the main challenges during digital post-processing of x-ray computed tomographic (XCT) measurement data is the reconstruction of the surface geometry of the measured objects. Conventionally, the surface geometry is defined as an isosurface of identical greyscale values, i.e. the x-ray absorbance of the material, based on a linear interpolation between neighboring voxels. Due to the complex surface geometry and rough surface, XCT measurements of additively manufactured (AM) parts are particularly prone to measurement artefacts caused by various physical effects when the x-rays penetrate the material. The irregular greyscale values at the measured surface geometry render commonly used single threshold greyscale value based isosurfaces as insufficient for representing the external and internal surface of the measured objects. This issue becomes particularly apparent when measuring multi-material objects, such as additively manufactured objects with integrated RFID tags. To address this challenge, this study presents a methodology for reliable surface geometry determination of XCT data based on previously acquired fringe projection (FP) data. For this purpose, the conventionally acquired surfaces geometries from the XCT and FP measurements are extracted, pre-processed and registered to each other before being merged into a single mesh. This merged data set is subsequently used as a starting point or reference for a locally adaptive threshold surface detection algorithm, which is able to capture the surface geometry at a sub-voxel resolution. In order to validate the methodology and confirm the envisaged benefits, selected geometry elements of the resulting surface geometry from measurements samples manufactured by additive manufacturing with integrated RIFD tags are compared to coordinate measurement machine (CMM) reference measurements. The results indicate a more robust surface geometry detection against artifacts especially for multi-material applications.

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“…The multi-mode tomography technique has recently offered a new insight into industry, whose sensors can be integrated to seek more precise description of measured objects [16][17][18][19][20]. Meanwhile, ultrasound has been considered as a promising green source for process tomography [21].…”

Section: Introductionmentioning

confidence: 99%

A transmission and reflection coupled ultrasonic process tomography based on cylindrical miniaturized transducers using PVDF films

Yang

Fan

et al. 2017

J. Inst.

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A transmission and reflection coupled ultrasonic process tomography has been developed, which is characterized by a proposed dual-mode (DM) reconstruction algorithm, as well as an adaptive search approach to determine an optimal image threshold during the image binarization. In respect of hardware, to improve the accuracy of time-of-flight (TOF) and extend the lowest detection limit of particle size, a cylindrical miniaturized transducer using polyvinylidene fluoride (PVDF) films is designed. Besides, the development of range-gating technique for the identification of transmission and reflection waves in scanning is discussed. A particle system with four iron particles is then investigated numerically and experimentally to evaluate these proposed methods. The sound pressure distribution in imaging area is predicted numerically, followed by the analysis of the relationship between the emitting surface width of transducer and particle size. After the processing of experimental data for effective waveform extraction and fusion, the comparison between reconstructed results from transmission-mode (TM), reflection-mode (RM), and dual-mode reconstructions is carried out and the latter manifests obvious improvements from the blurring reduction to the enhancement of particle boundary.

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Artifact reduction in non-destructive testing by means of complementary data fusion of x-ray computed tomography and ultrasonic pulse-echo testing

Cited by 12 publications

References 37 publications

A magnetostatic force inspection method for monitoring the oscillation marks of continuous casting

A magnetostatic force inspection method for monitoring the oscillation marks of continuous casting

Adaptive surface geometry determination in multi-material x-ray computed tomography using fringe projection

A transmission and reflection coupled ultrasonic process tomography based on cylindrical miniaturized transducers using PVDF films

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