Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1995-05-16
1997-04-15
O'Shea, Sandra L.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324 67, G01V 311, G01R 19145
Patent
active
056213255
ABSTRACT:
An apparatus and method is provided for determining if the signal received from an underground beacon (10) at a locator (22) is a true signal or a ghost signal. Orthogonal horizontal antenna (38) and vertical antenna (40) are used and a ratio is computed of the signal strengths measured by the two antennas. At the true location, the signal strength in the horizontal antenna (38) will be maximum and the signal strength of the vertical antenna (40) will be a null. If the ratio of the signal strength sensed by the horizontal antenna and vertical antenna is large, exceeding a predetermined value, the locator is receiving a valid signal from the beacon and a display of this fact is made on a display on the locator and the depth of the beacon is calculated. If the ratio is less than the predetermined value, a ghost signal is being received and this fact is displayed on the display on the locator (22).
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Draper Gregory W.
Gard Michael F.
Jin Jian J.
Nickel Frank S.
O'Shea Sandra L.
Phillips Roger C.
The Charles Machine Works, Inc.
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