Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1978-05-23
1980-09-02
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324326, G01R 3108, G01V 308
Patent
active
042209137
ABSTRACT:
Apparatus for detecting underground conductors carrying AC, such as cables or pipelines, has two receiver coils with horizontal axes one above the other, and other coils. By making phase comparisons from a selection of these the apparatus is located directly above the conductor. Then using the two horizontal coils there is derived a signal corresponding to the depth of the conductor, which can be visually indicated. Also, this depth signal, which is continuously available as the conductor is followed, is used to modify an output from one of the coils so that as the depth varies that output remains constant provided there are no discontinuities or faults in the cable.
REFERENCES:
patent: 3526831 (1970-09-01), Smith
patent: 3562633 (1971-02-01), Swain
patent: 3617865 (1971-11-01), Hakata
patent: 3893025 (1975-07-01), Humphreys
patent: 3907136 (1975-09-01), Christides et al.
patent: 4085360 (1978-04-01), Howell
patent: 4091322 (1978-05-01), Stankoff
Young, C. A., Measuring the Depth of Buried Cable, Bell Laboratories Record, Nov. 1965, pp. 399-401.
Howell Mark I.
Sole Lloyd H.
Electrolocation Limited
Strecker Gerard R.
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