Patents Assigned to Minelab Electronics Pty Limited
  • Patent number: 10969511
    Abstract: A metal detector, includes a transmitter for transmitting a repeating sequence of transmit magnetic field, each of the sequence includes a period of changing or constant non-zero transmit magnetic field, immediately followed by period of rapid change of transmit magnetic field, immediately followed by a period of substantially constant or zero transmit magnetic field; a receive coil; and a damping resistor. An end of the receive coil is connected to one end of the damping resistor and the other end of the damping resistor is connectable to a circuit with a variable parameter. A signal is induced in the receive coil during the period of rapid change of transmit magnetic field, and the signal induced in the receive coil decays at least at a termination of the period of rapid change of transmit magnetic field.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: April 6, 2021
    Assignee: Minelab Electronics Pty. Limited
    Inventor: Bruce Halcro Candy
  • Patent number: 10838103
    Abstract: A method for detecting an electrically conductive target in soil using a metal detector including the steps of: generating a transmit magnetic field for transmission into the soil based on the transmit signal; receiving a receive magnetic field; providing a receive signal induced by the receive magnetic field; determining a noise in the receive signal or a signal to noise ratio of the receive signal; and estimating, based on either the noise in the receive signal, or the signal to noise ratio of the received signal, or both, at least one effective detection depth of one or more types of electrically conductive targets in the soil.
    Type: Grant
    Filed: August 29, 2018
    Date of Patent: November 17, 2020
    Assignee: Minelab Electronics Pty. Limited
    Inventor: Ruifeng Huang
  • Patent number: 10078148
    Abstract: A method for detecting an electrically conductive target in soil using a metal detector, including the steps of: processing a receive signal using at least two different functions for producing at least two processed signals, each of the processed signals is at least partly insensitive to at least one unwanted signal due to the soil or an electromagnetic interference noise; determining a noise level of each of the at least two processed signals for producing at least two noise signals; and producing, from at least one of the at least two processed signals, an indicator output signal indicative of the presence of the electrically conductive target when the electrically conducting target is within the influence of a transmit magnetic field transmitted by the metal detector; wherein the step of producing an indicator output signal is dependent upon characteristics of the at least two noise signals.
    Type: Grant
    Filed: November 25, 2014
    Date of Patent: September 18, 2018
    Assignee: Minelab Electronics Pty Limited
    Inventor: Bruce Halcro Candy
  • Publication number: 20180106925
    Abstract: A metal detector transmitting, through a transmit coil, a repeating transmit signal cycle, which includes at least one receive period and at least one non zero transmit coil reactive voltage period; and sensing a current in the transmit coil during at least one receive period to control a magnitude and/or duration of the at least one non zero transmit coil reactive voltage period such that the average value of the current during at least one receive period of every repeating transmit signal cycle is substantially constant from cycle to cycle, and the current during at least one receive period is substantially independent of the inductance of the transmit coil.
    Type: Application
    Filed: November 22, 2017
    Publication date: April 19, 2018
    Applicant: Minelab Electronics Pty Limited
    Inventor: Bruce Halcro Candy
  • Patent number: 9829598
    Abstract: A method for reducing unwanted signals, due to a back emf decay, within a receive signal received by a receive coil of a metal detector during a demodulation of the receive signal after a transmission by a transmit coil of the metal detector, including controlling a T/R switch to control a characteristic of the back emf decay to reduce a duration of the period of the back emf decay.
    Type: Grant
    Filed: December 11, 2014
    Date of Patent: November 28, 2017
    Assignee: Minelab Electronics Pty Limited
    Inventor: Bruce Halcro Candy
  • Patent number: 9557390
    Abstract: A method for detecting a change of an impedance of a magnetic field receiver of a metal detector, including: having a first network of passive components, including the impedance of the magnetic field receiver; having a second network of passive components, excluding the impedance of the magnetic field receiver; and processing a first measurement signal from a first node of the first network with a second measurement signal from a second node of the second network to detect the change in the impedance of the magnetic field receiver; wherein the first network, the second network, the first node, the second node is configured such that in an absence of an external influence which affects the impedance of the magnetic field receiver, the first measurement signal is substantially the same with the second measurement signal; and in a presence of the external influence, the first measurement signal is different from the second measurement signal.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: January 31, 2017
    Assignee: Minelab Electronics Pty Limited
    Inventors: Laurentiu Stamatescu, Sergii Shapoval, Lachlan Gunn
  • Patent number: 9547065
    Abstract: A method for reducing a delay, between a transition of a transmission of a metal detector and a process of a receive signal received by a receive coil of the metal detector, due to a critically damped time constant of the receive coil, including: introducing a negative capacitance into the receive coil to reduce the critically damped time constant.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: January 17, 2017
    Assignee: Minelab Electronics Pty Limited
    Inventor: Bruce Halcro Candy
  • Patent number: 9429674
    Abstract: A method for detecting a target in a soil using a metal detector, including: generating a transmit magnetic field for transmission into the soil based on a transmit signal; receiving a receive magnetic field; providing a receive signal induced by the receive magnetic field; processing the receive signal for producing a set of data which has effects of signals from the soil reduced therein or removed therefrom; producing at least two components of a form of at least one time constant spectrum based on the set of data; and producing, at least one indicator output signal based on the at least two components for indicating the presence and/or identity of the target when the target is within, an influence of the transmit magnetic field.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: August 30, 2016
    Assignee: Minelab Electronics Pty Limited
    Inventor: Philip Shane Wahrlich
  • Patent number: 9366779
    Abstract: A method for detecting a target in a soil using a metal detector, including: generating a transmit magnetic field for transmission into the soil based on a transmit signal; receiving a receive magnetic field; providing a receive signal induced by the receive magnetic field; determining, based on the receive signal, a model of at least two independent components of the receive signal which are due to signals from the soil; processing the receive signal to produce a set of data which is with effects of the signals from the soil reduced therein or removed therefrom by fitting the model to the receive signal, then subtracting the fitted model from the receive signal; and producing, based on the set of data, an indicator output signal for indicating a presence and/or identity of the target.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: June 14, 2016
    Assignee: Minelab Electronics Pty Limited
    Inventor: Philip Shane Wahrlich
  • Patent number: 9348053
    Abstract: The present invention relates to a method for detecting an electrically conducting target in soil, including the steps of generating a repeating transmit signal cycle of a fundamental period using transmit electronics, the repeating transmit signal cycle including a first period and a second period within each fundamental period; generating a transmit magnetic field using a magnetic field transmitter, based on the repeating transmit signal cycle, for transmission into the soil; receiving a receive magnetic field using a magnetic field receiver; producing a receive signal induced by the receive magnetic field; arranging for a current flowing through the magnetic field transmitter to flow to a first potential through a damping resistor during the second period for providing a damping effect on the current flowing through the magnetic field transmitter; arranging for the current flowing through the magnetic field transmitter to flow to a second potential, predominantly through an alternative path with a lower re
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: May 24, 2016
    Assignee: Minelab Electronics Pty Limited
    Inventor: Bruce Halcro Candy
  • Patent number: 9250348
    Abstract: A metal detector has one or more feedback loops to control its repeating transmit signal cycle so that there is no reactive voltage drop across the transmit coil of the metal detector during at least one receive period of the metal detector.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: February 2, 2016
    Assignee: Minelab Electronics Pty Limited
    Inventor: Bruce Halcro Candy
  • Patent number: 9239400
    Abstract: A method for detecting electrically conductive targets in soil including the steps of: generating a transmit magnetic field for transmission into the soil based on a transmit signal; receiving a receive magnetic field; providing a receive signal induced by the receive magnetic field; selecting at least two models, each approximating a form of a signal due to a different type of source; processing the receive signal using the at least two models to produce at least two independent signals, each representing a component of the receive signal due to a different type of source; and producing, based on at least two independent signals, an indicator output signal indicative of the presence of the electrically conductive target.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: January 19, 2016
    Assignee: Minelab Electronics Pty Limited
    Inventor: Gregory Peter Harmer
  • Patent number: 8854043
    Abstract: A method for detecting an electrically conductive target in a soil using a metal detector, including: generating a transmit magnetic field for transmission into the soil based on a transmit signal; receiving a receive magnetic field; providing a receive signal induced by the receive magnetic field; processing the receive signal to produce a processed signal; processing a duration of the receive signal, the duration begins after a time the processed signal exceeds a threshold value and ends after a time the processed signal no longer exceeds the threshold value, to produce more than one estimations indicative of a presence of the electrically conductive target when the target is within an influence of the transmit magnetic field; and presenting graphically the more than one estimations.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: October 7, 2014
    Assignee: Minelab Electronics Pty Limited
    Inventors: Bruce Halcro Candy, Gregory Peter Harmer, Laurentiu Stamatescu, Pavel Valentine Kursa
  • Publication number: 20130299541
    Abstract: This invention relates to a support arrangement for an implement such as a metal detector, the support arrangement comprising a harness worn by a user, the harness comprising an attachment point for a first load-bearing element transferring a load associated with the implement to the attachment point, and a second load-bearing element transferring the load from the attachment point to a further point on the harness.
    Type: Application
    Filed: May 6, 2013
    Publication date: November 14, 2013
    Applicant: Minelab Electronics Pty Limited
    Inventor: Minelab Electronics Pty Limited
  • Publication number: 20130234716
    Abstract: A method for detecting an electrically conductive target in a soil using a metal detector, including: generating a transmit magnetic field for transmission into the soil based on a transmit signal; receiving a receive magnetic field; providing a receive signal induced by the receive magnetic field; processing the receive signal to produce a processed signal; processing a duration of the receive signal, the duration begins after a time the processed signal exceeds a threshold value and ends after a time the processed signal no longer exceeds the threshold value, to produce more than one estimations indicative of a presence of the electrically conductive target when the target is within an influence of the transmit magnetic field; and presenting graphically the more than one estimations.
    Type: Application
    Filed: March 5, 2013
    Publication date: September 12, 2013
    Applicant: Minelab Electronics Pty Limited
    Inventors: Bruce Halcro CANDY, Gregory Peter HARMER, Laurentiu STAMATESCU, Pavel Valentine KURSA
  • Publication number: 20130154649
    Abstract: A metal detector for detecting a metallic target in a soil including: transmit electronics for generating a repeating transmit signal cycle, the repeating transmit signal cycle including at least one receive period and at least one non-zero transmit coil reactive voltage period; a transmit coil connected to the transmit electronics for receiving the repeating transmit signal cycle and generating a transmit magnetic field; a receive coil for receiving a receive magnetic field during the at least one receive period and providing a receive signal induced by the receive magnetic field; and receive electronics connected to the receive coil for processing the receive signal during the at least one receive period to produce an indicator output signal, the indicator output signal including a signal indicative of a presence of the metallic target when under an influence of the transmit magnetic field; wherein the repeating transmit signal cycle is generated such that a waveform of the repeating transmit signal cycle i
    Type: Application
    Filed: December 19, 2012
    Publication date: June 20, 2013
    Applicant: Minelab Electronics Pty Limited
    Inventor: Minelab Electronics Pty Limited
  • Publication number: 20130147487
    Abstract: A method for detecting electrically conductive targets in soil including the steps of: generating a transmit magnetic field for transmission into the soil based on a transmit signal; receiving a receive magnetic field; providing a receive signal induced by the receive magnetic field; selecting at least two models, each approximating a form of a signal due to a different type of source; processing the receive signal using the at least two models to produce at least two independent signals, each representing a component of the receive signal due to a different type of source; and producing, based on at least two independent signals, an indicator output signal indicative of the presence of the electrically conductive target.
    Type: Application
    Filed: February 8, 2013
    Publication date: June 13, 2013
    Applicant: MINELAB ELECTRONICS PTY LIMITED
    Inventor: Minelab Electronics Pty Limited
  • Patent number: D686924
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: July 30, 2013
    Assignee: Minelab Electronics Pty Limited
    Inventors: Skye McQuillen, Brendan Smith, Richard Escane, Liam Gall, Evan Pryce, Cosmo Luppino
  • Patent number: D756247
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: May 17, 2016
    Assignee: Minelab Electronics Pty Limited
    Inventors: Nathan Anderson Pollock, Michael Rossignuolo, Lee Anthony Rodezno, Troy Christiaan Nyssen, Lars Milde
  • Patent number: D920139
    Type: Grant
    Filed: June 4, 2019
    Date of Patent: May 25, 2021
    Assignee: Minelab Electronics Pty. Limited
    Inventors: David Campbell Newport-Peace, Cosmo Luppino, Nicholas Schultz