Improved method and apparatus for detecting and locating residua

Details Improved method and apparatus for detecting and locating residua Improved method and apparatus for detecting and locating residua

1980-07-08

1985-07-02

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

324 67, 324260, 324326, G01R 33022, G01R 3304

Patent

active

045271232

ABSTRACT:
Methods and apparatus for detecting and locating residually magnetized misplaced tools and the like are disclosed. A sensitive gradiometer having a hand-held probe provides a balanced, phase cancelling magnetic field. The presence of a weak residual mangetic field emanating from the misplaced tool upsets the balance of the generated field, and this imbalance provides an audio signal which is used to locate the tool.

REFERENCES:
patent: 2321356 (1943-06-01), Berman
patent: 3445928 (1969-05-01), Beynon
patent: 3460528 (1969-08-01), Carney
patent: 3541432 (1970-11-01), Scarbrough
patent: 3909704 (1975-09-01), Schonstedt
patent: 4068164 (1978-01-01), Schwartz et al.
patent: 4100492 (1978-07-01), Forster

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