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Title: Portable microwave instrument for non-destructive evaluation of structural characteristics

A portable microwave instrument for evaluating characteristics of a structural member includes a source of microwave energy, a transmitter coupled to the source of microwave energy for transmitting a microwave signal at the structural member, and a receiver positioned on the same side of the structural member as the transmitter and being disposed to receive a microwave signal reflected by the structural member. A phase angle difference is determined between the transmitted microwave signal and the received microwave signal using a signal splitter and a balanced mixer. The difference in phase angle varies in accordance with differences in size, shape and locations of constituent materials within the structural member.
Inventors:
 [1];  [2];  [3];  [4]
  1. (Clinton, TN)
  2. (Knoxville, TN)
  3. (Oak Ridge, TN)
  4. (Loudon, TN)
Issue Date:
OSTI Identifier:
869721
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
Patent Number(s):
US 5384543
Contract Number:
AC05-84OR21400
Research Org:
LOCKHEED MARTIN ENRGY SYST INC
Country of Publication:
United States
Language:
English
Subject:
portable; microwave; instrument; non-destructive; evaluation; structural; characteristics; evaluating; source; energy; transmitter; coupled; transmitting; signal; receiver; positioned; disposed; receive; reflected; phase; angle; difference; determined; transmitted; received; splitter; balanced; mixer; varies; accordance; differences; size; shape; locations; constituent; materials; structural characteristics; microwave signal; phase angle; microwave energy; wave energy; non-destructive evaluation; wave signal; receiver positioned; microwave instrument; transmitter coupled; portable microwave; constituent material; /324/