Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1993-01-12
1996-04-09
O'Shea, Sandra L.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324232, G01V 308, G01V 310, G01N 2772, G01R 3312
Patent
active
055065066
ABSTRACT:
A metal detector apparatus and a metal detection method for detecting and discriminatory interrogating a metal target buried in the ground. The detector includes a transmitter for providing a first varying magnetic field including at least two frequency components and a receiver for providing a resultant voltage dependent upon a second magnetic field resulting from the combined effects of the ground and metal targets buried in the ground, upon the first alternating magnetic field. The detector samples at least three voltage measurements of the resultant voltage over three different time periods to provide three sampled values which are then processed by a microprocessor to provide three average ground balanced signals from which at least two ratios are calculated and compared against a pre-defined response. The method of detecting and discriminating between metal targets includes providing a first varying magnetic field having at least two frequency components and receiving a resultant voltage dependent upon a second magnetic field resulting from the combined effects of the ground and metal targets buried in the ground, upon the first alternating magnetic field. The resultant voltage is sampled and processed over three different time periods to provide three average ground balanced signals from which at least two ratios are calculated and compared against a predefined response. This comparison is used to distinguish between ferrous and non-ferrous metals.
REFERENCES:
patent: 4110679 (1978-08-01), Payne
patent: 4128803 (1978-12-01), Payne
patent: 4249128 (1981-03-01), Karbowski
patent: 4325027 (1982-04-01), Dykstra et al.
patent: 4486713 (1984-12-01), Gifford
patent: 4628265 (1986-12-01), Johnson et al.
patent: 4677384 (1987-06-01), Payne
patent: 4700139 (1987-11-01), Podhrasky
patent: 4709213 (1987-11-01), Podhrasky
patent: 4783630 (1988-11-01), Shoemaker
patent: 4868504 (1989-09-01), Johnson
patent: 4894618 (1990-01-01), Candy
patent: 4942360 (1990-07-01), Candy
patent: 4975646 (1990-12-01), LlamasLlamas et al.
patent: 5039946 (1991-08-01), Mamontov et al.
patent: 5047718 (1991-09-01), Aittoniemi et al.
Halcro Nominees Pty Ltd.
O'Shea Sandra L.
Phillips Roger
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