Probe for detecting the presence of magnetic material in a groun

Details Probe for detecting the presence of magnetic material in a groun Probe for detecting the presence of magnetic material in a groun

1988-06-24

1990-02-20

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

By magnetic means

324221, 166 665, G01V 300, G01V 308, G01V 318, G01N 2772

Patent

active

049029762

ABSTRACT:
In use, the probe (1) is dropped into a ground-hole (3), for the purpose of detecting the depth of the steel casing (16) of the hole. The probe comprises a long, slim, tubular housing (2) made of stainless steel. Attached inside the housing is a springy stalk (10) made of PVC. The stalk is deflectable laterally, and carries a magnet (11) at its free end. The magnet responds to the steel, and causes the stalk to deflect while in the presence of the steel. The housing, and a stainless steel sleeve (12) around the magnet, comprise a pair of electrical contacts, which break apart and send a signal to the surface when the magnetic influence disappears. The probe is suspended on a cable (4) which is calibrated to indicate the depth of the probe when the signal is received.

REFERENCES:
patent: 2749663 (1956-06-01), Lemelson
patent: 4219773 (1980-08-01), Markfelt

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