Patent ID: 9429674
Filing Date: 2016-08-30
CPC Classification: G01V

Claim Text:
1. A method for detecting a target in a soil using a metal detector, comprising: generating a transmit magnetic field, using a transmit coil, for transmission into the soil based on a transmit signal; receiving a receive magnetic field, using a receive coil, to provide a receive signal induced by the receive magnetic field; processing the receive signal, using a processor, for producing a set of data which has effects of signals from the soil reduced therein or removed therefrom; producing, using the processor, at least two components of a form of at least one time constant spectrum based on the set of data to represent the target; and producing, using the processor, at least one indicator output signal based on the at least two components for indicating at least one of a presence and an identity of the target when the target is within an influence of the transmit magnetic field; wherein each of the at least two components corresponds to a time constant within the at least one time constant spectrum.