Locatable object suitable for underground use and methods of loc

Details Locatable object suitable for underground use and methods of loc Locatable object suitable for underground use and methods of loc

1990-11-29

1992-04-21

Sikes, William L.

Optical waveguides

Optical transmission cable

343719, 340571, G02B 644

Patent

active

051061759

ABSTRACT:
An all-dielectric cable (20) or object which is destined to be buried is provided with at least one electronically resonant marker (44). After the cable or object is buried, a tradesperson may locate the cable or object by causing an electromagnetic signal (71), which comprises at least one frequency to be transmitted by a transceiver (60) and to be induced into the electronically resonant marker associated with the cable or object. A return signal (73), which is radiated by the electronically resonant marker at a frequency different from the at least frequency, is received by the transceiver. Characteristics of the return signal provide useful information for the determination of the location of the buried cable or object.

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