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Iovea M.,Accent Pro 2000 Ltd. | Neagu M.,Accent Pro 2000 Ltd. | Duliu O.G.,University of Bucharest | Oaie G.,Romanian National Institute of Marine Geology and Geoecology GeoEcoMar | And 2 more authors.
Journal of Nondestructive Evaluation | Year: 2011

A dedicated on-board dual energy computer tomograph able to generate both tomographic and digital radiographic images of unconsolidated sediments cores with a diameter up to 12 cm and a height up to 1 m was built and tested on-board of the R/V Mare Nigrum. This instrument, designed to be used on-board of any oceanographic research vessel with minimum adaptations, can work very well on stationary laboratory too, provided that there is adequate protection against hard X-rays. The tomograph has a single 160 kV X-ray tube and two set of 240 in-line X-ray detectors separated by a copper attenuator (dual-energy arrangement) allowing one to obtain tomographic as well as digital radiographic images depicting the distribution of both density and effective atomic number of the objects. In tomographic and radiographic mode, the spatial resolution of reconstructed images of the linear attenuation coefficient is about 0.5 mm while in dual-energy mode, when reconstructed images depict the distribution of densities and effective atomic numbers that requires an additional smoothing filtering, the spatial resolution is about 1 mm. By using a set of standard samples with known values of densities and effective atomic numbers we have estimated the precision in calculating the local values of these parameters to a maximum of 8%. By its performance and by its ability to work on-board, the tomograph could be useful not only for oceanographic researches but also for any exploratory tests performed on open sea. © Springer Science+Business Media, LLC 2009.


Iovea M.,Accent Pro 2000 Ltd. | Neagu M.,Accent Pro 2000 Ltd. | Mateiasi G.,Accent Pro 2000 Ltd. | Duliu O.,University of Bucharest
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

A novel portable and autonomous X-ray dual-energy Radioscopy equipment, developed for bomb squad interventions and NDT applications and capable of in-situ digital radiography imaging with measurement of the effective Atomic number of materials (Zeff), is presented. The system consists of a 2D dual-energy X-ray detector based on a rapidly translated linear array, a portable X-ray source and dedicated software running on a laptop or tablet PC. By measurement of the collected x-ray intensities at two different energy spectra, the system can directly compute the material Zeff value for various organic materials contained in the scanned object and then identify them from a database list. The entire system calibration has been obtained using explosive simulants with known Zeff values, the measurement error of Zeff being around ±3.5 % with respect to the reference values. The excellent image resolution and the ability of the automated threat identification algorithm are presented for experiments with a briefcase and a hand-held baggage having various domestic objects and an explosive simulant inside. © 2011 SPIE.


Ponomarev M.G.,Brunel University | Kappatos V.,Brunel University | Selcuk C.,Brunel University | Gan T.-H.,Brunel University | And 4 more authors.
Powder Metallurgy | Year: 2013

The ability of radiography data processing algorithms for detection and segmentation of cloud-like discontinuities and cracks in both green and sintered PM parts has been demonstrated. A Volterra kernel series can be considered as an analytic description for radiography imaging, which relates the ideal image G(x,y) and the sensed image F(x,y) using some operator. The sensor gives the image F(x,y), which is connected with the ideal image G. The extraction of an image that is as close as possible to the ideal image occurs during the preprocessing stage. Thresholds can be determined from pixel intensity histogram analyses by determining the valley points that can serve as thresholds. Another set of radiography images may require another approach such as the Laplacian technique. After confirming the ability of the algorithms to obtain defect segmentation, the next step will be to build a database of defects. The best approach is likely to be to use representation in moment space.


Emandi I.,University of Bucharest | Iovea M.,Accent Pro 2000 Ltd. | Duliu O.G.,University of Bucharest | Emandi A.,University of Bucharest
International Journal of Conservation Science | Year: 2011

Nondestructive investigation methods with penetrating radiations, such as digital radiography and computed tomography proved to be very useful not only in assessing the cultural heritage, but also but also in any restoration and conservation activity by supplying a multitude of micro-structural details regarding a great diversity of works of art. Consequently, present paper presents two case studies regarding the use of digital radiography in investigating panel icons from the Popa Tatu Church, Bucharest. In both cases it was possible to evidence not only the actual state of conservation of wooden panels but also fragments of the oil picture, allowing a better planning of the future conservation work.


Ponomarev M.G.,Brunel University | Selcuk C.,Brunel University | Gan T.-H.,Brunel University | Amos M.,Twi Ltd. | And 5 more authors.
Powder Metallurgy | Year: 2014

Digital radiography is a promising nondestructive testing tool for powder metallurgy (PM) parts, in which transmitted X-rays are recorded to generate data for an advanced defect detection system. An important part of this system is the data processing platform for pattern recognition in X-ray images. Combinations of advanced techniques for noise reduction, contrast enhancement and image segmentation are employed. Algorithms of registration for images in regions of interest are discussed, e.g. the scale invariant feature transform (SIFT). Modern pattern recognition methodologies such as smoothing, moment representation, image alignment and optical flow towards feature classification are evaluated. The proposed defect detection and classification capability for automatic analysis of digital radiographic images from PM parts potentially allows integration into multiple-view inspection systems, which should enhance quality control in the PM manufacturing and production environment. Defect detection systems able to work at the speed of current production lines are of great interest to both PM manufacturers and users. © 2014 Institute of Materials, Minerals and Mining.


Daito I.,Kyoto University | Ohgaki H.,Kyoto University | Suliman G.,Horia Hulubei National Institute of Physics and Nuclear Engineering | Iancu V.,Horia Hulubei National Institute of Physics and Nuclear Engineering | And 2 more authors.
Energy Procedia | Year: 2016

Non-destructive inspection carried out by using nuclear resonances excited by an MeV energy region gamma ray is a promising method. The high penetrability of MeV gamma ray of nuclear resonant energy makes possible the detection of nuclides surrounded by massive materials. As an application of this method, computed tomography imaging of nuclear distribution inside objects can be reconstructed from transmission factor of gamma rays. We have studied the image reconstruction of the nuclear distribution using Monte-Carlo simulations to estimate the gamma-ray transmission factor assuming the ELI-NP facility where about 3 order higher intensity of quasi-monoenergetic gamma rays will be available. © 2016 The Authors.


Accent Pro 2000 Ltd. | Entity website

Copyright 2000 - 2014 Accent Pro 2000


Accent Pro 2000 Ltd. | Entity website

Copyright 2000 - 2014 Accent Pro 2000


Accent Pro 2000 Ltd. | Entity website

Copyright 2000 - 2014 Accent Pro 2000


Accent Pro 2000 Ltd. | Entity website

The implementation of an automated X-ray inspection for detecting counterfeit electronic components (primarily integrated circuits) was devoted to presenting the results of a last experiment conducted in optimized conditions, and to achieving a new general draft of such facilities. Experiments were conducted with a TDI type radiation detector but this time we used a microfocus source this combination being ideal for the projects purpose ...

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