Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1988-05-11
1989-09-12
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324 67, 340551, G01V 311, G01V 3165
Patent
active
048663883
ABSTRACT:
A method and system for determining the location of a first insulated conductor and a plurality of similar branch conductors that are branches of the first conductor, but without ohmic contact being made with the first conductors. A passive marker having a resonant circuit that includes an inductor and capacitor is provided for each of the branch conductors and is positioned to be inductively coupled to the first conductor and the associated branch conductor. The first conductor is a part of a closed loop circuit and each branch conductor is a part of separate closed loop circuits. An alternating signal applied to any one of the closed loop circuits is inductively transmitted to each of the other closed loops that is inductively coupled to a passive marker having a resonant frequency equal to the frequency of the alternating signal. Flow of alternating signals in the closed loops and passive markers cause a detectable electromagnetic signal to be produced to identify the location of the first conductor, branch conductors and passive markers when conducting the alternating signals.
REFERENCES:
patent: 2148389 (1939-02-01), Yonkers
patent: 2167490 (1939-07-01), Ryan
patent: 4119908 (1978-10-01), Cosman et al.
patent: 4767237 (1988-08-01), Cosman et al.
Cosman Armond D.
Minarovic Joe T.
Kirn Walter N.
Marben Robert L.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Strecker Gerard R.
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