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Title: Impedance sensing of flaws in non-homogeneous materials

An apparatus and method are disclosed for sensing impedances of materials placed in contact therewith. The invention comprises a plurality of drive electrodes and one or more sense electrodes. Both rotating electric fields and differently shaped electric fields are provided for, as are analysis of structure and composition at different orientations and depths. 10 figs.
Inventors:
Issue Date:
OSTI Identifier:
441874
Assignee:
Sandia Corp., Albuquerque, NM (United States) SNL; SCA: 420500; PA: EDB-97:042915; SN: 97001739258
Patent Number(s):
US 5,602,486/A/
Application Number:
PAN: 8-336,999
Contract Number:
AC04-76DP00789
Resource Relation:
Other Information: PBD: 11 Feb 1997
Research Org:
AT&T Corporation
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; ELECTRICAL TESTING; DEFECTS; MEASURING METHODS; ELECTRODES; ELECTRIC FIELDS; IMPEDANCE