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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. 6 figures.
Inventors:
; ; ;
Issue Date:
OSTI Identifier:
6647693
Assignee:
Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States) PTO; EDB-95-030723
Patent Number(s):
US 5384543; A
Application Number:
PPN: US 7-972776
Contract Number:
AC05-84OR21400
Resource Relation:
Patent File Date: 9 Nov 1992
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; MECHANICAL STRUCTURES; NONDESTRUCTIVE TESTING; PORTABLE EQUIPMENT; RADIOMETERS; MICROWAVE RADIATION; RADIATION SOURCES; ELECTROMAGNETIC RADIATION; EQUIPMENT; MATERIALS TESTING; MEASURING INSTRUMENTS; RADIATION DETECTORS; RADIATIONS; TESTING 420500* -- Engineering-- Materials Testing

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