Metal detector

Details Metal detector Metal detector

2005-11-02

2009-08-25

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

C324S228000, C324S337000

Reexamination Certificate

active

07579839

ABSTRACT:
A real time electronic metal detector including a magnetic transmitter (1) and a receiver (3), wherein the receiver includes approximate sine-wave weighted synchronous demodulation and a switched voltage signal is applied to the magnetic transmitter and the said receiver approximate sine-wave weighted synchronous demodulation is selected to receive synchronously with the switched voltage signal, such that the switched voltage signal and the receiver approximate sine-wave weighted synchronous demodulation may be altered by means of operator selection.

REFERENCES:
patent: 4628265 (1986-12-01), Johnson et al.
patent: 4868504 (1989-09-01), Johnson
patent: 4948265 (1990-08-01), Futerman
patent: 5537041 (1996-07-01), Candy
patent: 5576624 (1996-11-01), Candy
patent: 5654638 (1997-08-01), Shoemaker

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