Method and apparatus including a sensing head with a pair of str

Electricity: measuring and testing – Conductor identification or location – Inaccessible

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324 3, 333 10, G01R 3100, G01V 308

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active

039709272

ABSTRACT:
Apparatus, primarily for the short-range detection of metallic objects, includes a sensing head formed by a pair of strip transmission lines located in close proximity to one another and in association with a ground plane. Pulse generating means is arranged to apply pulses to one end of one strip-line, and pulse receiving means is connected to the corresponding end of the other strip-line for detecting an output pulse induced in the line. The strip-lines are terminated by their characteristic impedances, and output pulses from the said other line are characterized by any change in coupling between the lines due to the interposition between them of a material having a dielectric constant different from that of the medium surrounding the metallic objects.

REFERENCES:
patent: 2242312 (1941-05-01), Machts
patent: 3315155 (1967-04-01), Colani
patent: 3490034 (1970-01-01), Marshall
patent: 3601716 (1971-08-01), Bolt et al.
patent: 3659228 (1972-04-01), Napoli
patent: 3742341 (1973-06-01), Clowes et al.
patent: 3863024 (1975-01-01), Caragliano et al.

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