Method for locating buried markers which are disposed along the

Details Method for locating buried markers which are disposed along the Method for locating buried markers which are disposed along the

1977-08-24

1978-10-10

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 67, 340686, 340551, G01V 308, G01V 3302

Patent

active

041199081

ABSTRACT:
Systems and methods for locating re-access points along an underground conductor wherein tuned passive marker elements are disposed adjacent and alongside the conductor at the re-access points, a transmitted signal is coupled to the conductor to create a field about same such that a receiver that is swung to and fro laterally of the conductor by an operator traversing same will normally have a peak-null-peak output, but as a marker is approached the receiver will have a peak output in the normally null region due to a field generated by the passive marker element, thus permitting the location of the passive marker element to be precisely determined.

REFERENCES:
patent: 2438197 (1948-03-01), Wheeler
patent: 3418572 (1968-12-01), Humphreys
patent: 3740742 (1973-06-01), Thompson et al.
patent: 3836842 (1974-09-01), Zimmermann et al.
Eggleston, H., Locating Underground Pipes, Journal of the Southern California Meter Assoc., Instruments, vol. 24, Issue 1, Jan. 1951, pp. 105-108, 110.
Lougheed et al., Buried Marking of Point Locations, IEEE Transactions on Instrumentation and Measurement, vol. IM-22, No. 4, pp. 399-402, Dec. 1973.

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