Method and apparatus for metal detection employing digital...

Details Method and apparatus for metal detection employing digital... Method and apparatus for metal detection employing digital...

2005-08-26

2008-10-07

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

By magnetic means

C324S239000, C324S331000

Reexamination Certificate

active

07432715

ABSTRACT:
A metal detector employing digital means for the generation of highly quality reference signals used for transmission and demodulation and capable of continuously monitoring the parameters of the transmitting and receiving coils. Using the monitored signals and calibration of the measurements paths in both amplitude-frequency and phase-frequency, the effects of the targets and magnetic and/or conductive grounds on the transmitting and receiving coils are greatly reduced, leaving the received signals substantially free of instrumental effects. Methods of ground tracking and filtering are described to separate target information from the ground plus-target receive signals. Single-and multi-frequency operation, with or without modulation for both sinusoidal and square wave transmission, is described, as are means to detect abnormal situations and to find and operate at resonance.

REFERENCES:
patent: 5691640 (1997-11-01), King
patent: 2002/0163346 (2002-11-01), Arndt et al.
patent: 02/25318 (2002-03-01), None
IJ Won et al., GEM-3 Monostatic Broadband Electromagnetic Induction Sensor, http://www.geophex.com/Publications/GEM-3%20by%20Won%et%20al%201997, 12 pages.

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