Assessment of the Measurement Procedure for Dimensional Metrology with X-ray Computed Tomography

Kraemer, Alexandra; Lanza, Gisela

doi:10.1016/j.procir.2016.02.018

Cited by 22 publications

(15 citation statements)

References 4 publications

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“…Significant research has been performed in relation to dimensional metrology using XCT. This dimensional research includes measurement accuracy [2,3], scaling error compensation [4] and development of XCT measurement procedures and workflows [5,6]. Surface texturefrom-XCT extraction and characterisation, however, is in its infancy, but If XCT is to be used as an industrial inspection tool for component surface texture acceptance then this measurement and characterisation will need to be performed per accepted reference standards, such as ISO 25178.…”

Section: Introductionmentioning

confidence: 99%

Factors affecting the accuracy of areal surface texture data extraction from X-ray CT

et al. 2017

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The ability to perform non-destructive areal surface analysis of the internal surfaces of additively manufactured (AM) components would be advantageous during product development, process control and product acceptance. Currently industrial X-ray computed tomography (XCT) is the only practical method for imaging the internal surfaces of AM components. A viable method of extracting useable areal surface texture data from XCT scans has now been developed and this paper reports on three measurement and data processing factors affecting the value of areal parameters per ISO 25178-2 generated from XCT volume data using this novel technique. X-ray, Metrology, Additive manufacturing 2.1. Measurement plates Individual rectangular plates, approximately 10 mm x 20 mm, were cut from a Rubert Microsurf 334 (casting) test panel. The casting panel was used as this surface was considered to most closely represent the surface of a powder bed fusion (PBF) metal AM component. The nominal surface Ra values for the plates used for this work were 50 µm and 25 µm as these approximate the as-Contents lists available at SciVerse ScienceDirect

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Section: Introductionmentioning

confidence: 99%

Factors affecting the accuracy of areal surface texture data extraction from X-ray CT

et al. 2017

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“…The reference value for each material is usually calculated as the peak value assigned to that material in the histogram graph ( Figure 4). Although this method is widely used in multiple applications due to its simplicity, it does not guarantee an accurate determination of the surface [22,28]. Therefore, in this work, the threshold value obtained by the ISO50 method has been corrected.…”

Section: Local Threshold Methods (Ct1)mentioning

confidence: 99%

“…Different measuring strategies are also compared in [25], where three different inspection software packages for volume and surface data analysis were applied. Additionally, the authors in [26] evaluated and quantified the repeatability of post-processing settings, such as data fitting, the definition of the datum system and surface determination, which is also analyzed in [27,28]. As some of these works show, the surface extraction technique used is one of the most influent factors in the final measurement uncertainty.…”

Section: Introductionmentioning

confidence: 99%

Comparison of surface extraction techniques performance in computed tomography for 3D complex micro-geometry dimensional measurements

Torralba

Jiménez

Yagüe‐Fabra

et al. 2018

Int J Adv Manuf Technol

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The number of industrial applications of Computed Tomography (CT) for dimensional metrology in 10 0-10 3 mm range has been continuously increasing, especially in the last years. Due to its specific characteristics Computed Tomography has the potential to be employed as a viable solution for measuring 3D complex micro-geometries as well (i.e. in the sub-mm dimensional range). However, there are different factors that may influence the CT process performance, being one of them the surface extraction technique used. In this paper two different extraction techniques are applied to measure a complex miniaturized dental file by CT in order to analyze its contribution to the final measurement uncertainty in complex geometries at the mm to sub-mm scales. The first method is based on a similarity analysis: the threshold determination; while the second one is based on a gradient or discontinuity analysis: the 3D Canny algorithm. This algorithm has proven to provide accurate results in parts with simple geometries, but its suitability for 3D complex geometries has not been proven so far. To verify the measurement results and compare both techniques, reference measurements are performed on an optical coordinate measuring machine (OCMM). The systematic errors and uncertainty results obtained show that the 3D Canny adapted method slightly lower systematic deviations and a more robust edge definition than the local threshold method for 3D complex micro-geometry dimensional measurements.

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“…Therefore, the investigation of permeability was performed by measurement of remaining air inside the specimen. Pores filled with air were segmented by an ISO50 threshold between the air and bone foam material peak in the grey value histogram [10]. Eventually detected bubbles of air outside of the bone foam material were removed manually from the data.…”

Section: Image Processingmentioning

confidence: 99%

In-Situ Compression Test of Artificial Bone Foams in Controlled Environment Using X-Ray Micro-Computed Tomography

Glinz

Kytýř

Fíla

et al. 2019

APP

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In this study, we investigated specimens of artiﬁcial bone foams, developed by the research group for surgical simulators at the UAS Linz, which are used to mimic the haptic feedback of physiologic and pathologic bone for more realistic surgery training. Specimens with two kinds of mineral ﬁller material as well as diﬀerent amounts of foaming agent were tested in an environmental in-situ loading stage developed by the ITAM CAS and scanned via X-ray micro-computed tomography. In this in-situ stage, specimens can be immersed in liquid and tested under temperature-controlled conditions. Consequently, a total amount of 12 specimens was subjected to compression loading; half of them immersed in water at 36.5◦C and half in dry condition. Results showed that there is no signiﬁcant inﬂuence of liquid immersion to the compression outcome. However, foams with less amount of foaming agent appeared to have smaller pores resulting in higher compression strength.

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Assessment of the Measurement Procedure for Dimensional Metrology with X-ray Computed Tomography

Cited by 22 publications

References 4 publications

Factors affecting the accuracy of areal surface texture data extraction from X-ray CT

Factors affecting the accuracy of areal surface texture data extraction from X-ray CT

Comparison of surface extraction techniques performance in computed tomography for 3D complex micro-geometry dimensional measurements

In-Situ Compression Test of Artificial Bone Foams in Controlled Environment Using X-Ray Micro-Computed Tomography

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