METAL DETECTOR TARGET DISCRIMINATION IN MINERALIZED SOILS
First Claim
1. Receive electronics of a metal detector for processing a received signal from a target in a soil, the receive electronics including:
- processing electronics for synchronous demodulating or sampling the received signal to produce at least two substantially ground balanced signals;
processing electronics for processing the at least two substantially ground balanced signals to produce at least two substantially ground balanced processed signals, a first substantially ground balanced processed signal being more indicative of a spread of a time constant density spectrum of the received signal than is a second substantially ground balanced processed signal, and the second substantially ground balanced processed signal being more indicative of an average time constant of the received signal than is the first substantially ground balanced processed signal; and
processing electronics for processing the at least two substantially ground balanced processed signals to produce an output signal indicative of at least the spread of the time constant density spectrum.
1 Assignment
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Accused Products
Abstract
This invention relates to receive electronics of a metal detector for processing a received signal from a target in a soil, the receive electronics including: processing electronics for synchronous demodulating or sampling the received signal to produce at least two substantially ground balanced signals; processing electronics for processing the at least two substantially ground balanced signals to produce at least two substantially ground balanced processed signals, a first substantially ground balanced processed signal being more indicative of a spread of a time constant density spectrum of the received signal than a second substantially ground balanced processed signal, and the second substantially ground balanced processed signal being more indicative of an average time constant of the received signal than the first substantially ground balanced processed signal; and processing electronics for processing the at least two substantially ground balanced processed signals to produce an output signal indicative of at least the spread of the time constant density spectrum.
20 Citations
13 Claims
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1. Receive electronics of a metal detector for processing a received signal from a target in a soil, the receive electronics including:
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processing electronics for synchronous demodulating or sampling the received signal to produce at least two substantially ground balanced signals; processing electronics for processing the at least two substantially ground balanced signals to produce at least two substantially ground balanced processed signals, a first substantially ground balanced processed signal being more indicative of a spread of a time constant density spectrum of the received signal than is a second substantially ground balanced processed signal, and the second substantially ground balanced processed signal being more indicative of an average time constant of the received signal than is the first substantially ground balanced processed signal; and processing electronics for processing the at least two substantially ground balanced processed signals to produce an output signal indicative of at least the spread of the time constant density spectrum. - View Dependent Claims (2, 3, 4, 5)
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6. A metal detector used for detecting a target in a soil including:
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a) transmit electronics for generating a repeating transmit signal cycle; b) a magnetic field transmitter connected to the transmit electronics for receiving the repeating transmit signal cycle and generating a transmitted magnetic field; c) a magnetic field receiver for receiving a received magnetic field and providing a received signal induced by the received magnetic field; d) receive electronics connected to the magnetic field receiver for processing the received signal, the receive electronics including; processing electronics for synchronous demodulating or sampling the received signal to produce at least two substantially ground balanced signals; processing electronics for processing the at least two substantially ground balanced signals to produce at least two substantially ground balanced processed signals, a first substantially ground balanced processed signal being more indicative of a spread of a time constant density spectrum of the received signal than is a second substantially ground balanced processed signal, and the second substantially ground balanced processed signal being more indicative of an average time constant of the received signal than is the first substantially ground balanced processed signal; and processing electronics for processing the at least two substantially ground balanced processed signals to produce an output signal indicative of at least the spread of the time constant density spectrum. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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Specification