Computed Tomography Metrology in Industrial Research and Development

Kasperl, Stefan; Hiller, Jochen; Krumm, Michael

doi:10.3139/120.110053

Cited by 26 publications

(23 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is one of the recent topics in CT metrology. Several studies document that artifacts in CT images have a great influence on dimensional measurements [4,5]. Among artifacts which mostly occur in CT images belong beam hardening, scatter radiation, ring artifacts, being the physical effects in CT.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A study on evaluation strategies in dimensional X-ray computed tomography by estimation of measurement uncertainties

Müller

Hiller

Cantatore

et al. 2012

Int. J. Metrol. Qual. Eng.

View full text Add to dashboard Cite

Abstract.Computed tomography has entered the industrial world in 1980's as a technique for nondestructive testing and has nowadays become a revolutionary tool for dimensional metrology, suitable for actual/nominal comparison and verification of geometrical and dimensional tolerances. This paper evaluates measurement results using different measuring strategies applied in different inspection software packages for volume and surface data analysis. The strategy influence is determined by calculating the measurement uncertainty. This investigation includes measurements of two industrial items, an aluminium pipe connector and a plastic toggle, a hearing aid component. These are measured using a commercial CT scanner. Traceability is transferred using tactile and optical coordinate measuring machines, which are used to produce reference measurements. Results show that measurements of diameter for both parts resulted in smaller systematic errors compared to distance and height measurements. It was found that uncertainties of all measurands evaluated on surface data were generally greater compared to measurements performed on volume data.

show abstract

Section: Introductionmentioning

confidence: 99%

“…In particular, they followed ISO 15530-3 describing the use of calibrated workpieces. The Monte Carlo method for uncertainty estimations in CT was used in [4,16]. By CT, a complete volumetric 3D model of a scanned part is obtained, both as a volume model or a surface model, defined from the volume model by creating a polygonal mesh.…”

Section: Introductionmentioning

confidence: 99%

A study on evaluation strategies in dimensional X-ray computed tomography by estimation of measurement uncertainties

Müller

Hiller

Cantatore

et al. 2012

Int. J. Metrol. Qual. Eng.

View full text Add to dashboard Cite

show abstract

“…Therefore, the CT can be used not only as a simple inspection method but also as a measuring principle capable of providing accurate geometrical information. CT is in the process of revolutionizing quality engineering in industry [87][88][89]. The Metrotom CT machine together with Calypso software are able to provide also internal and external 3D modeling of the measured part.…”

Section: D-ct Technique One Of the New Developed Conceptsmentioning

confidence: 99%

Advanced Nanomeasuring Techniques for Surface Characterization

Ali

2012

ISRN Optics

View full text Add to dashboard Cite

Advanced precise and accurate nanomeasurement techniques play an important role to improve the function and quality of surface characterization. There are two basic approaches, the hard measuring techniques and the soft computing measuring techniques. The advanced soft measuring techniques include coordinate measuring machines, roundness testing facilities, surface roughness, interferometric methods, confocal optical microscopy, scanning probe microscopy, and computed tomography at the level of nanometer scale. On the other hand, a new technical committee in ISO is established to address characterization issues posed by the areal surface texture and measurement methods. This paper reviews the major advanced soft metrology techniques obtained by optical, tactile, and other means using instruments, classification schemes of them, and their applications in the engineering surfaces. Furthermore, future trends under development in this area are presented and discussed to display proposed solutions for the important issues that need to be addressed scientifically.

show abstract

“…Several research groups have developed a simulation tool for X-ray imaging for different purposes, e.g. VXI [5,6,7,8,9], XRayImagingSimulator [10,11,12], ScorpiusXLab [13], XRSIM [14], etc. However, most of these tools are developed in-house to meet specific needs for their own research and are not readily available.…”

Section: Introductionmentioning

confidence: 99%

A realistic projection simulator for laboratory based X-ray micro-CT

Dhaene

Pauwels

Schryver

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

In X-ray Computed Tomography (CT) each voxel of the reconstructed image contains a calculated grey value which represents the linear attenuation coefficient for the materials in that voxel. Conventional laboratory based CT scanners use polychromatic X-ray sources and integrating detectors with an energy dependent efficiency. Consequently the reconstructed attenuation coefficients will depend on the spectrum of the source and the spectral sensitivity of the detector. Beam hardening will alter the spectrum significantly as the beam propagates through the sample. Therefore, sample composition and shape will affect the reconstructed attenuation coefficients as well. A polychromatic projection simulator has been developed at the "Centre for X-ray Tomography" of the Ghent University (UGCT) which takes into account the aforementioned variables, allowing for complete and realistic simulations of CT scans for a wide range of geometrical setups. Monte Carlo simulations of the X-ray tubes and detectors were performed to model their spectral behaviour. In this paper, the implementation and features of the program are discussed. Simulated and real CT scans are compared to demonstrate the quantitative correctness of the simulations. Experiments performed at two different UGCT scanners yield a maximum deviation of 3.9% and 6.5% respectively, between the measured and simulated reconstructed attenuation coefficients.

show abstract

Computed Tomography Metrology in Industrial Research and Development

Cited by 26 publications

References 3 publications

A study on evaluation strategies in dimensional X-ray computed tomography by estimation of measurement uncertainties

A study on evaluation strategies in dimensional X-ray computed tomography by estimation of measurement uncertainties

Advanced Nanomeasuring Techniques for Surface Characterization

A realistic projection simulator for laboratory based X-ray micro-CT

Contact Info

Product

Resources

About