Patent ID: 6690169
Filing Date: 2004-02-10
Classification: G01V

Abstract:
A method for effecting metal detection using a metal detector including transmit and receive electronic timing control circuitry, power supplies, and receive and transmit signal electronic circuitry, and at least first and second inductive coils, comprising the steps of:connecting at least the first coil to said transmit signal electronic circuitry to transmit magnetic field signals from said at least first coil when a pulsed current flows through said first coil in response to signals from said electronic timing control circuitry; connecting at least the first coil to said receive signal electronic circuitry to thereby produce a first receive electronic signal; connecting at least the second coil to said receive signal electronic circuitry to thereby produce a second receive electronic signal in response to signals from said electronic timing control circuitry; linearly combining at least a portion of said first receive electronic signal with a proportion of said second receive electronic signal; producing a first resultant linear combination signal; and processing said combination signal to produce an output signal for coupling to indicator means.