Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1992-11-09
1995-01-24
Regan, Maura K.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324637, G01R 2700
Patent
active
053845439
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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Bible Don W.
Crutcher Richard I.
Maddox Stephen R.
Sohns Carl W.
Marcus Michael S.
Martin Marietta Energy Systems Inc.
Pennington Edward A.
Regan Maura K.
Spicer James M.
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