Results 171 to 180 of about 6,117,689 (215)

Accuracy evaluation of an X-ray microtomography system

Micron, 2016
Microstructural parameter evaluation of reservoir rocks is of great importance to petroleum production companies. In this connection, X-ray computed microtomography (μ-CT) has proven to be a quite useful method for the assessment of rocks, as it provides important microstructural parameters, such as porosity, permeability, pore size distribution and ...
Jaquiel S, Fernandes, Carlos R, Appoloni, Celso P, Fernandes   +2 more
openaire   +2 more sources

X-ray microtomography on beamline X at SSRL

Review of Scientific Instruments, 1989
This article describes a high-resolution three-dimensional CT system which has been tested on the new wiggler beamline X-2 at the Stanford Synchrotron Radiation Laboratory. The present system is a rotate-only design which uses a virtual phase CCD array camera optically coupled to a high-resolution phosphor screen.
Kinney, J. H., Johnson, Q. C., Nichols, M. C., Bonse, U., Saroyan, R. A., Nusshardt, R., Pahl, R.   +6 more
openaire   +2 more sources

X-ray Microtomography of Ceramic Artifacts

MRS Proceedings, 1995
In this paper we describe the analysis of ceramic artifacts with a new type of three dimensional x-ray microscopy which can have micron spatial resolution. The x-ray microscopy is based on a microtomographic technique which reconstructs the three dimensional structure of millimeter sized specimens from high resolution digital radiographs of the ...
H. Dunsmuir, P.B. Vandiver, R.R. Chlanelll, H.W. Deckman, J.H. Hardenbergh   +4 more
openaire   +1 more source

The effect of beam hardening on resolution in x-ray microtomography

SPIE Proceedings, 2004
Spatial resolution describes the ability to distinguish adjacent objects. It is often used as a measure of the quality of an image. By studying the edge of a cylindrical object a value for the spatial resolution is obtained. However, as a consequence of the polychromatic source used in micro-CT, beam hardening will occur which has the effect of ...
Elke Van de Casteele, Dirk Van Dyck, Jan Sijbers, Erik Raman   +3 more
openaire   +3 more sources

X-Ray Synchrotron Microtomography

2014
A brief summary of the principles behind X-ray Synchrotron microtomography is reported. Applications to polymer and membrame science are alo described.
openaire   +3 more sources

Microwave sintering explored by X-ray microtomography

2010
Microwave energy is seen as offering potential energy and time savings for the processing of materials. For metal-diamond composite for example, selective heating of the metallic grain, could preserve the diamonds from allotropic conversion to graphite while the matrix could be brought to its sintering temperature.
Ishizaki, Kotaro, Battabyal, Manjusha, Pitini, Yoko Y., Nicula, Radu, Vaucher, Sébastien   +4 more
openaire   +2 more sources

X-ray energy optimisation in computed microtomography

Physics in Medicine and Biology, 1989
Expressions describing the absorbed dose and the number of incident photons necessary for the detection of a contrasting detail in x-ray transmission CT imaging of a circular phantom are derived as functions of the linear attenuation coefficients of the materials comprising the object and the detail.
openaire   +2 more sources

X-ray microtomography: past and present

SPIE Proceedings, 2008
The way in which microtomography developed in the authors' laboratory in the early 1980s is described, together with some background material. Later developments in scanning geometries and detectors, mainly in other laboratories, are described. Some present problems and possible future directions will be considered.
J. C. Elliott, G. R. Davis, S. D. Dover
openaire   +1 more source

Artefacts in X-ray microtomography of materials

Materials Science and Technology, 2006
X-ray microtomography is becoming an increasingly popular tool in the study of microstructure and failure mechanisms in biological and engineering materials, producing three-dimensional (3D) maps of the X-ray linear attenuation coefficient. Limitations of the technique are due to, for example, limited X-ray flux, use of polychromatic radiation (in ...
G. R. Davis, J. C. Elliott
openaire   +1 more source

Magnified hard X-ray microtomography

2000 IEEE Nuclear Science Symposium. Conference Record (Cat. No.00CH37149), 2002
Summary form only given. In the field of hard X-ray microtomography one goal is the enhancement of resolution. Several ways can be followed to obtain this objective. One possibility is the use of high-resolution X-ray films or detector screens coupled with a microscope optical system.
C. Rau, T. Weitkamp, A. Snigirev, C.G. Schroer, J. Tummler, B. Lengeler   +5 more
openaire   +1 more source