Portable microwave instrument for non-destructive evaluation of structural characteristics
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United States of America Patent
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Jan 24, 1995
Grant Date -
N/A
app pub date -
Nov 9, 1992
filing date -
Nov 9, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.
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