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Title: Development of an electrical impedance computed tomographic two-phase flows analyzer. Final report

Abstract

This report summarizes the work on the research project on this cooperative program between DOE and Hitachi, Ltd. Major advances were made in the computational reconstruction of images from electrical excitation and response data with respect to existing capabilities reported in the literature. A demonstration is provided of the imaging of one or more circular objects within the measurement plane with demonstrated linear resolution of six parts in two hundred. At this point it can be said that accurate excitation and measurement of boundary voltages and currents appears adequate to obtain reasonable images of the real conductivity distribution within a body and the outlines of insulating targets suspended within a homogeneous conducting medium. The quality of images is heavily dependent on the theoretical and numerical implementation of imaging algorithms. The overall imaging system described has the potential of being both fast and cost effective in comparison with alternative methods. The methods developed use multiple plate-electrode excitation in conjunction with finite element block decomposition, preconditioned voltage conversion, layer approximation of the third dimension and post processing of boundary measurements to obtain optimal boundary excitations. Reasonably accurate imaging of single and multiple targets of differing size, location and separation is demonstrated andmore » the resulting images are better than any others found in the literature. Recommendations for future effort include the improvement in computational algorithms with emphasis on internal conductivity shape functions and the use of adaptive development of quadrilateral (2-D) or tetrahedral or hexahedral (3-D) elements to coincide with large discrete zone boundaries in the fields, development of a truly binary model and completion of a fast imaging system. Further, the rudimentary methods shown herein for three-dimensional imaging need improving.« less

Authors:
;
Publication Date:
Research Org.:
Rensselaer Polytechnic Inst., Troy, NY (United States)
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States)
OSTI Identifier:
677190
Report Number(s):
DOE/ER/13032-T3
ON: DE99001023; TRN: AHC29821%%325
DOE Contract Number:  
FG02-90ER13032
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Aug 1998
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; PROGRESS REPORT; COMPUTERIZED TOMOGRAPHY; TWO-PHASE FLOW; IMAGE PROCESSING; FLOW VISUALIZATION; ALGORITHMS; ELECTRIC IMPEDANCE; RESEARCH PROGRAMS

Citation Formats

Ovacik, L, and Jones, O C. Development of an electrical impedance computed tomographic two-phase flows analyzer. Final report. United States: N. p., 1998. Web. doi:10.2172/677190.
Ovacik, L, & Jones, O C. Development of an electrical impedance computed tomographic two-phase flows analyzer. Final report. United States. https://doi.org/10.2172/677190
Ovacik, L, and Jones, O C. 1998. "Development of an electrical impedance computed tomographic two-phase flows analyzer. Final report". United States. https://doi.org/10.2172/677190. https://www.osti.gov/servlets/purl/677190.
@article{osti_677190,
title = {Development of an electrical impedance computed tomographic two-phase flows analyzer. Final report},
author = {Ovacik, L and Jones, O C},
abstractNote = {This report summarizes the work on the research project on this cooperative program between DOE and Hitachi, Ltd. Major advances were made in the computational reconstruction of images from electrical excitation and response data with respect to existing capabilities reported in the literature. A demonstration is provided of the imaging of one or more circular objects within the measurement plane with demonstrated linear resolution of six parts in two hundred. At this point it can be said that accurate excitation and measurement of boundary voltages and currents appears adequate to obtain reasonable images of the real conductivity distribution within a body and the outlines of insulating targets suspended within a homogeneous conducting medium. The quality of images is heavily dependent on the theoretical and numerical implementation of imaging algorithms. The overall imaging system described has the potential of being both fast and cost effective in comparison with alternative methods. The methods developed use multiple plate-electrode excitation in conjunction with finite element block decomposition, preconditioned voltage conversion, layer approximation of the third dimension and post processing of boundary measurements to obtain optimal boundary excitations. Reasonably accurate imaging of single and multiple targets of differing size, location and separation is demonstrated and the resulting images are better than any others found in the literature. Recommendations for future effort include the improvement in computational algorithms with emphasis on internal conductivity shape functions and the use of adaptive development of quadrilateral (2-D) or tetrahedral or hexahedral (3-D) elements to coincide with large discrete zone boundaries in the fields, development of a truly binary model and completion of a fast imaging system. Further, the rudimentary methods shown herein for three-dimensional imaging need improving.},
doi = {10.2172/677190},
url = {https://www.osti.gov/biblio/677190}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Aug 01 00:00:00 EDT 1998},
month = {Sat Aug 01 00:00:00 EDT 1998}
}