Ground control unit for cable locating

Details Ground control unit for cable locating Ground control unit for cable locating

2007-05-17

2008-12-09

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

C324S066000, C324S067000

Reexamination Certificate

active

07463034

ABSTRACT:
A system for selectively grounding each of a plurality of short-haul buried utility conveyances coupled to a common long-haul buried utility conveyance to enable a conveyance locating signal transmitted through the long-haul conveyance to travel from the long-haul utility conveyance to a selected short-haul utility conveyance. The system includes a first optical switch for selecting each of the plurality of short-haul utility conveyances to be grounded, where the first optical switch is adapted to receive an optical signal and selectively output the optical signal on one of a plurality of optical fibers; and a second optical switch coupled to each of the plurality of optical fibers for grounding each short-haul utility conveyance in response to the optical signal on a corresponding optical fiber.

REFERENCES:
patent: 5363094 (1994-11-01), Staron et al.
patent: 5512819 (1996-04-01), Boudreaux
patent: 6700380 (2004-03-01), Eslambolchi et al.

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