Active impulse magnetometer with bipolar magnetic impulse generator and fast fourier transform receiver to detect sub-surface metallic materials
First Claim
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1. An active impulse magnetometer system, comprising:
- a magnetic transmitter element;
a pulse generator for driving said transmitter element to transmit first and second magnetic pulses of opposite polarity in rapid succession to provide a rapid rate of change of magnetic field from a first polarity to a second polarity and thereby create a wide bandwidth of energy, said first and second pulses providing a bipolar magnetic impulse waveform transmitted by said transmitter element;
a magnetic receiver element;
means for measuring an impulse response of objects within a detection region to said transmitted bipolar magnetic impulse waveform, said means comprising means responsive to magnetic signals received at said receiver element in response to said transmitted bipolar magnetic impulse waveform for performing a fast Fourier transformation of said received signals; and
signal processor responsive to said transformed received signals to indicate the presence of metal objects causing disturbances in said magnetic impulse response.
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Abstract
An active impulse magnetometer includes a magnetic field transmitter which generates a low frequency magnetic impulse waveform. A separate magnetometer receiver responds to the transmitted waveform, and produces a receive waveform which is transformed by a Fast Fourier Transform device into the frequency domain. The transformed signal is processed to indicate the presence of any detected objects.
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Citations
18 Claims
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1. An active impulse magnetometer system, comprising:
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a magnetic transmitter element; a pulse generator for driving said transmitter element to transmit first and second magnetic pulses of opposite polarity in rapid succession to provide a rapid rate of change of magnetic field from a first polarity to a second polarity and thereby create a wide bandwidth of energy, said first and second pulses providing a bipolar magnetic impulse waveform transmitted by said transmitter element; a magnetic receiver element; means for measuring an impulse response of objects within a detection region to said transmitted bipolar magnetic impulse waveform, said means comprising means responsive to magnetic signals received at said receiver element in response to said transmitted bipolar magnetic impulse waveform for performing a fast Fourier transformation of said received signals; and signal processor responsive to said transformed received signals to indicate the presence of metal objects causing disturbances in said magnetic impulse response. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An active impulse magnetometer, comprising:
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a magnetic transmitter element secured on a movable vehicle; a pulse generator for driving said transmitter element to transmit first and second magnetic pulses of opposite polarity in rapid succession to provide a rapid rate of change of magnetic field from a first polarity to a second polarity and thereby create a wide bandwidth of energy, said first and second pulses providing a bipolar magnetic impulse waveform transmitted by said transmitter element; a magnetic receiver element secured on said vehicle in a spaced relationship relative to said transmitter element; means for measuring an impulse response of objects within a detection region to said transmitted bipolar magnetic impulse waveform, said means comprising means responsive to magnetic signals received at said receiver element in response to said transmitted bipolar magnetic impulse waveform for performing a fast Fourier transformation of said received signals; means for providing a vehicle location signal indicative of a present location of said vehicle; and signal processor responsive to said transformed received signals and to said vehicle location signal to locate metal targets causing disturbances in said magnetic impulse response. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A mine detector for detection of sea mines, comprising:
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a magnetic transmitter element secured on a movable sea-going vessel having respective port and starboard sides; a pulse generator for driving said transmitter element to transmit first and second magnetic pulses of opposite polarity in rapid succession to provide a rapid rate of change of magnetic field from a first polarity to a second polarity and thereby create a wide bandwidth of energy, said first and second pulses providing a bipolar magnetic impulse waveform transmitted by said transmitter element; a magnetic receiver element secured on said vessel in a spaced relationship relative to said transmitter element; means for measuring an impulse response of objects within a detection region to said transmitted bipolar magnetic impulse waveform, said means comprising means responsive to magnetic signals received at said receiver element in response to said transmitted bipolar magnetic impulse waveform for performing a fast Fourier transformation of said received signals; and signal processor responsive to said transformed received signals to locate mines within said detection region causing disturbances in said magnetic impulse response. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification