Step current inductive antenna for pulse inductive metal...

Details Step current inductive antenna for pulse inductive metal... Step current inductive antenna for pulse inductive metal...

2006-12-12

2006-12-12

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

C324S329000

Reexamination Certificate

active

07148691

ABSTRACT:
A device and method to improve pulse inductive metal detector (MD) sensitivity uses multiple, current steps to reduce the voltage rating of electronic components. Current reduction in one implementation is done with multiple switched resistors coupled to a voltage source and connected to the transmitter coil. The current reduction in another implementation is done with multiple switched current sources that are connected to the transmitter coil and are switched inactive one by one to reduce the total current to the transmitter coil. The current is stepped down in rapid secession with a time delay between current transitions less than the time constant of the metal target under investigation.

REFERENCES:
patent: 5576624 (1996-11-01), Candy
patent: 6653838 (2003-11-01), Candy
patent: 6686742 (2004-02-01), Candy

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