Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1997-06-09
1999-05-04
Mullen, Jr., Thomas J.
Communications: electrical
Condition responsive indicating system
Specific condition
7317029, 324663, G08B 1902
Patent
active
059008202
ABSTRACT:
A system for detecting accretion of frazil ice on underwater gratings inces a housing for disposition beneath a water surface and spaced from but proximate an underwater intake grating. A pair of parallel electrically conductive bars are mounted side-by-side in the housing and extend therefrom. The bars are in communication with an electromagnetic wave generator in the housing. A coaxial transmission line is connected at a first end to the housing and in communication with the pair of bars for extension from the housing upwardly above the water surface. A monitoring station is disposed above the water surface for receiving signals from the bars, the monitoring station having a second end of the transmission line fixed thereto. The wave generator propagates electromagnetic waves to the bars for further travel to distal ends of the bars, and back to the housing and thence to the monitoring station. The monitoring station is adapted to compute wave round trip travel time in the bars and to compute changes in the round trip travel time, from which is determined absence, presence, and build-up of frazil ice on the bars, thereby providing an indication of same on the grating.
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Marsh Luther A.
Mullen Jr. Thomas J.
The United States of America as represented by the Secretary of
LandOfFree
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