Transmitter-receiver loop buried metal object locator with switc

Details Transmitter-receiver loop buried metal object locator with switc Transmitter-receiver loop buried metal object locator with switc

1979-05-18

1982-09-07

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

G01V 311, G01V 3165

Patent

active

043486398

ABSTRACT:
Apparatus and method are provided for locating the position, depth, and run of a longitudinal metal object. Specifically, apparatus and method are provided for the tracing of a longitudinal subterranean metal object such as pipes or cables. The apparatus is capable of energizing a subterranean metal object and thereafter detecting the electromagnetic field produced by the metal object with a search loop. The magnitude of a current produced in the search loop is precisely measured whereby the location of the pipe or cable is precisely established. Circuitry is provided to provide high noise immunity to the detection of electromagnetic fields not originating with the metal object. Means are provided to maintain the system sensitivity without relying upon tedious mechanical adjustments.

REFERENCES:
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patent: 2807777 (1957-09-01), Doll
patent: 3471772 (1969-10-01), Smith
patent: 3478263 (1969-11-01), Hentschel
patent: 3614600 (1971-10-01), Ronka
patent: 3676772 (1972-07-01), Lee
patent: 3826973 (1974-07-01), Pflaum
patent: 4016486 (1977-04-01), Pecori
patent: 4024468 (1977-05-01), Hirschi
patent: 4030026 (1977-06-01), Payne
patent: 4070612 (1978-01-01), McNeill et al.
patent: 4095180 (1978-06-01), Brown
patent: 4110679 (1978-08-01), Payne
Metrotech Corp. publication, "Underground Locator Products", Pipe and Cable Locator Model 480.

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