Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1996-02-08
1997-07-15
Brown, Glenn W.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
324532, 324557, 340605, G01N 2700, G01R 3111
Patent
active
056487240
ABSTRACT:
An apparatus for detecting the presence, location, and extent of the moise in a roof using metallic time-domain reflectomerry (TDR) includes an electrical pulses, a transmission line embedded within the roof and connected with the pulse generator, and a signal analyzer which interprets the electrical pulses transmitted along the transmission line. When the transmission line is exposed to moisture, the dielectric constant of the transmission line changes, thereby causing a portion of the energy of the transmitted pulse to be reflected back toward the source and a portion to pass through to the end of transmission line. The distance from the source and the length of the dielectric discontinuity are determined by analyzing the round-trip travel time of the reflected pulse.
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Flanders Stephen N.
Yankielun Norbert E.
Brown Glenn W.
Marsh Luther A.
U.S. Army Corps of Engineers as represented by the Secretary of
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