Browsing by Subject "tomografia gamma"

Now showing 1 - 7 of 7

Access status: Open Access ,
Algorytmy rekonstrukcji obrazów w dualnym systemie tomograficznym
(Wydawnictwa AGH, 2005) Włodarczyk, Jarosław; Mosorov, Volodymyr; Lewandowski, Sławomir
In many cases tomographic systems containing the single set of measuring sensors are not sufficient to the calculation of all important characteristic of investigated flows. Nowadays more and more a dual modality systems containing two independent sets of measuring sensors are used. The best example is the connection of the gamma tomography with an electrical capacitance tomography. These two modalities are complimentary both for spatial and temporal resolutions. The article presents the review of algorithms enabling the processing of data from both electrical capacitance and gamma ray tomography systems.
Access status: Open Access ,
Analiza wpływu szumów na jakość rekonstrukcji w dualnym systemie tomograficznym
(Wydawnictwa AGH, 2006) Włodarczyk, Jarosław; Lewandowski, Sławomir
The article presents the analysis of the noise influence existing in measuring raw data on the quality of the reconstruction images in Dual Modality Tomography DMT (Dual Modality Tomography) which consists of the gamma tomograph and the electrical capacitance tomograph. During an experiments all combinations of the noise-free and noise-data were analyzed by introducing to raw data 10 percent white noise, then examined his influence on the quality of the reconstruction and the ability of the reconstruction algorithm DMR to correct the data.
Access status: Open Access ,
Analiza zniekształceń obrazów w tomografii gamma
(2005) Lewandowski, Sławomir; Mosorov, Volodymyr; Włodarczyk, Jarosław
Gamma-ray tomography is one of the most often use techniques for industrial process control. Computerised tomography is a system of indirect imaging, it means that the image is not obtained directly, but it is obtained on the way of numeric calculations (so-called image reconstruction). This paper presents analysis of images distortion and the relationship between distortion and sources' and detectors' layout.
Access status: Open Access ,
Generowanie macierzy wag na potrzeby rekonstrukcji obrazu w przemysłowej tomografii gamma
(Wydawnictwa AGH, 2006) Lewandowski, Sławomir; Włodarczyk, Jarosław
Weight matrix is indispensable element in algebraic image reconstruction techniques (ART, SIRT etc.) in computed tomography. Classical approaches to weight matrix generation are well-known. In this paper a new approach to weight matrix generation for gamma-ray tomography is given.
Access status: Open Access ,
Multimodality measurement data fusion in image reconstruction for multiphase flow measurements
(Wydawnictwa AGH, 2010) Nowakowski, Jacek; Hammer, Erling; Sankowski, Dominik; Styra, Darius; Wajman, Radosław; Banasiak, Robert; Romanowski, Andrzej
The multiphase flow measurements are very important tasks in many areas of industrial processes applications. The image reconstruction algorithms allow to visualize cross section of a flow (2D) reconstruction or 3D volumetric reconstruction. In many industrial applications for process control it is not necessary to perform image reconstruction resulting high-resolution image. The main goal is to offer method of accurate measurement and precise and robust calculation algorithm leading to phase fraction calculation. The submitted paper presents results of theoretical research and experiments performed both in the University in Lodz and University of Bergen using installed there multi phase flow rig. The paper shows possibilities of applying both image reconstruction algorithms for data obtained from electrical impedance and capacitance tomography and combining it with data obtained simultaneously from gamma sensors. The experiments showed applicability of assumed approach and good concordance of data obtained from measurements with real parameters of a flow.
Access status: Open Access ,
New concept of ECT/ERT/GRT tomography for multiphase flow measurements
(Wydawnictwa AGH, 2010) Nowakowski, Jacek; Hammer, Erling; Sankowski, Dominik; Styra, Darius; Wajman, Radosław; Banasiak, Robert; Romanowski, Andrzej
The multiphase flow measurements are very important tasks in many areas of industrial processes applications. One of them is undersea exploration of oil in the petroleum industry. The submitted paper presents application of multi modality: capacitance, impedance and gamma ray tomography for performing measurements of a flow composed of sea water, oil and gas flow, theoretical principles applied to design multimodality tomograph and results of experiments performed in University of Bergen. The experiments were done using ECRT tomograph designed and built in Technical University of Lodz and combined measurements of signals acquired from all measuring modalities. Measurement confirmed that multi modality approach allows to give fast and reliable on-line results of measurements of composition of multi phase flow. Applied algorithm allowed to speed up on-line measurements and presented results in a form required in industrial applications. The derived conclusions can be used as a guidelines for preparation of industrial applicable construction of tomograph.
Access status: Open Access ,
Zalety dualnego systemu tomograficznego na tle klasycznej tomografii gamma
(Wydawnictwa AGH, 2007) Włodarczyk, Jarosław; Lewandowski, Sławomir
This paper presents comparison of images quality obtained from classical gamma-ray tomography system and dual modality tomography system. Dual modality system was made by combining gamma-ray tomograph and electrical capacitance tomograph.