Metal detector apparatus utilizing controlled phase response to

Details Metal detector apparatus utilizing controlled phase response to Metal detector apparatus utilizing controlled phase response to

1981-09-28

1984-12-04

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

324233, 324239, G01V 310, G01R 3302

Patent

active

044867131

ABSTRACT:
Metal detector apparatus includes a controlled phase responsiveness to allow operation with reduced ground effects while discriminating between different types of metals. A phase relationship is predetermined that will reject unwanted signals from mineralized ground and trash metals and will be responsive to the signals from desired metals. The algebraic relationship between two signals is determined so that only input signals falling within the desired algebraic relationship are used to provide an output signal.

REFERENCES:
patent: 4024468 (1977-05-01), Hirschi
patent: 4030026 (1977-06-01), Payne
patent: 4110679 (1978-08-01), Payne
patent: 4128803 (1978-12-01), Payne
patent: 4325027 (1982-04-01), Dykstro et al.
LeGaye, E. S., "Induction Balance Detector," Electronic Metal Detector Handbook, Western Heritage Press, Mar. 1975, pp.95-99.

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