Electrical impedance tomography
First Claim
1. A method of measuring the distribution of electrical impedance of a fluid, comprising:
- surrounding the fluid with an electrically conductive ring electrode that comprises a plurality of metallic contacts embedded into the conductive ring and spatially distributed around the axis of the ring, in electric contact with an outside wall of the ring;
applying between two contacts, sequentially, an input electrical signal, which while applied to a pair of the contacts, causes respective output signals to be generated between any other pair of contacts;
measuring said output electrical signals between successive pairs of contacts, the contacts of each pair of contacts selected for signal generation and for signal reception, respectively, span an azimuthal angle of about π
/2 with respect to the axis of the conductive ring electrode.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods and apparatus are provided for obtaining a representation of the distribution of electrical impedance within a multiphase flow with an electrically continuous or discontinuous principle flow contained within an electrically conductive solid ring electrode, including providing a plurality of mutually spaced electrical contacts mounted at the outside wall of the ring and electrically contacting with the ring, applying currents or voltages to the ring from the electrical contacts, generating a more homogeneous electric field distribution within the material, measuring voltage or current distribution alone the ring from other electrical contacts, relatively intensifying the imaging sensitivity at the central area of the sensing domain using a π/2 angle sensing strategy and reconstructing the representation of the impedance distribution using CG method with an error processing strategy.
83 Citations
25 Claims
-
1. A method of measuring the distribution of electrical impedance of a fluid, comprising:
-
surrounding the fluid with an electrically conductive ring electrode that comprises a plurality of metallic contacts embedded into the conductive ring and spatially distributed around the axis of the ring, in electric contact with an outside wall of the ring;
applying between two contacts, sequentially, an input electrical signal, which while applied to a pair of the contacts, causes respective output signals to be generated between any other pair of contacts;
measuring said output electrical signals between successive pairs of contacts, the contacts of each pair of contacts selected for signal generation and for signal reception, respectively, span an azimuthal angle of about π
/2 with respect to the axis of the conductive ring electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. An apparatus for measuring the distribution of electrical impedance of a fluid comprising:
a cylindrical electrically conductive ring electrode surrounding the fluid, the ring electrode comprising a plurality of metallic contacts embedded into the conductive ring and spatially distributed around the axis of the ring, in electric contact with an outside wall of the ring, the the metallic contacts being responsive to a sequentially applied input electrical signal, which while applied to a pair of the contacts, causes respective output signals to be generated between any other pair of contacts, the contacts of each pair of contacts selected for signal generation and for signal reception, respectively, span an azimuthal angle of about σ
/2 with respect to the axis of the conductive ring electrode.
-
25. A method of determining an internal structure of a body comprising:
-
surrounding a body fluid with an electrically conductive ring electrode that comprises a plurality of metallic contacts embedded into the conductive ring and spatially distributed around the axis of the ring, in electric contact with an outside wall of the ring;
applying between two contacts, sequentially, an input electrical signal, which while applied to a pair of the contacts, causes respective output signals to be generated between any other pair of contacts;
measuring said output electrical signals between successive pairs of contacts, the contacts of each pair of contacts selected for signal generation and for signal reception, respectively, span an azimuthal angle of about π
/2 with respect to the axis of the conductive ring electrode.
-
Specification