Simultaneous time-domain and frequency-domain metal detector

Details Simultaneous time-domain and frequency-domain metal detector Simultaneous time-domain and frequency-domain metal detector

2006-07-18

2006-07-18

Lefkowitz, Edward (Department: 2862)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

C324S239000, C324S326000

Reexamination Certificate

active

07078906

ABSTRACT:
A metal detector capable of operating in both a time-domain mode and a frequency-domain mode includes a transmitter component and a receiver component. The transmitter component includes a transmitter coil that can receive both an AC and DC current source for frequency-and time-domain operation respectively. The AC signal is impressed on the DC signal such that while the transmitter coil is charging, frequency-domain sensing is occurring and when the transmitter coil is switched off, time-domain sensing is occurring. The receiver component uses a primary field bucking method to ensure that both time-and frequency-domain modes can operate with the receiver coil.

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