Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1988-02-16
1989-09-19
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324329, 324326, G01N 2772, G01V 311
Patent
active
048689106
ABSTRACT:
A metal detector for use in locating objects such as coins includes analog and digital circuits, further combined with a microprocessor and stored program routines, to provide enhanced ground exclusion balance, target discrimination, and ease of use. Both discrimination and ground exclusion balance are under microprocessor control. A ground exclusion balancing routine is automated and can automatically track any changes in ground mineralization, changing the ground balance setting whenever required. A plurality of memory registers, each corresponding to a different range of phase angles, can be coded by the user to indicate whether a target producing a signal in that phase angel range is a desirable object. When a target response is detected, its characteristic phase angle is calculated. The memory register corresponding to the calculated phase angle is then checked. If the register contains an ACCEPT code, the metal detector signals the user that an accepted target has been found. The program of the microprocessor allows the user to program the metal detector to accept or reject a particular type of metallic item by passing the search head loop assembly over a sample item a few times, allowing the metal detector to determine and store in a memory register the sample's characteristic phase angle.
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Eisenzopf Reinhard J.
Solis Jose M.
White's Electronics, Inc.
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