TITLE: Development of an electrical impedance tomography system for an air-water vertical bubble column.

AUTHOR: T. J. O'Hern;   J. R. Torczynski;   S. L. Ceccio;   A. L. Tassin; G. L. Chahine.

INST.  AUTHOR: Sandia National Labs., Albuquerque, NM.

SPONSOR: Department of Energy, Washington, DC.


PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  1995,  8p.


NOTES: International mechanical engineering congress and exhibition - winter annual meeting of the American Society of Mechanical Engineers, San Francisco, CA (United States), 12-17 Nov 1995. Sponsored by Department of Energy, Washington, DC.


Because the components of a multiphase flow often exhibit different electrical properties, a variety of probes have been developed to study such flows by measuring impedance in the region of interest. Researchers are now using electric fields to reconstruct the impedance distribution within a measurement volume via Electrical Impedance Tomography (EIT). EIT systems employ voltage and current measurements on the boundary of a domain to create a representation of the impedance distribution within the domain. The development of the Sandia EIT system (S-EIT) is reviewed The construction of the projection acquisition system is discussed and two specific EIT inversion algorithms are detailed. The first reconstruction algorithm employs boundary element methods, and the second utilizes finite elements. The benefits and limitations of EIT systems are also discussed.  Preliminary results are provided.

REPORT  NUMBER: SAND-95-1992C;   CONF-951135-17