Method and apparatus for determining the presence of or absence

Details Method and apparatus for determining the presence of or absence Method and apparatus for determining the presence of or absence

1976-06-14

1978-04-18

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 67, G01V 310, G01R 3302

Patent

active

040853608

ABSTRACT:
An instrument for detecting the presence or absence of a buried pipe or cable employs three or more generally vertical coil aerials which define a triangular or polygonal area on the ground. The natural or induced electromagnetic radiation from any underground pipe or cable cutting that area gives rise to phase differences at the aerials which can be discriminated. The aerial array may be adjustable, and the discrimination may be direct or involve mixing the received signals. Facility for listening to various frequencies, perhaps simultaneously, can be provided.

REFERENCES:
patent: 1820953 (1931-09-01), Sundberg et al.
patent: 2358027 (1944-12-01), Penther et al.
patent: 3321700 (1967-05-01), Zimmerman
patent: 3388323 (1968-06-01), Stripling
patent: 3391334 (1968-07-01), Ruehle
patent: 3617865 (1971-11-01), Hakata
patent: 3889179 (1975-06-01), Cutler
patent: 3907136 (1975-09-01), Christides et al.
patent: 3930324 (1976-01-01), Wightman et al.
patent: 4010413 (1977-03-01), Daniel

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