Detection apparatus with a matching network for nulling and associated methods
First Claim
1. A detection apparatus comprising:
- a transmitter configured to generate a detection signal;
a coil assembly comprising a transmit coil coupled to said transmitter and configured to transmit the detection signal toward an object to be detected, with the object to be detected emitting a target signal in response to the transmitted detection signal, and a single receive coil adjacent said transmit coil and configured to receive the target signal emitted from the object along with an undesired coupling signal from said transmit coil;
a matching network coupled to said transmitter and configured to generate an adjusted detection signal by adjusting a profile of the detection signal to match a profile of the undesired coupling signal;
wherein the matching network comprises an amplitude stage coupled to a filter stage; and
an output stage having a first input coupled to said single receive coil to receive the target signal and the undesired coupling signal, and a second input coupled to said matching network to receive the adjusted transmit signal, and configured to subtract the adjusted detection signal from the target signal and the undesired coupling signal so that the target signal remains.
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Abstract
A detection apparatus includes a transmitter to generate a detection signal, and a coil assembly including a transmit coil and a receive coil. The transmit coil transmits the detection signal toward an object to be detected, with the object to be detected emitting a target signal in response to the transmitted detection signal. The receive coil receives the target signal emitted from the object along with an undesired coupling signal from the transmit coil. A matching network is coupled to the transmitter and generates an adjusted detection signal by adjusting a profile of the detection signal to match a profile of the undesired coupling signal. An output stage has a first input coupled to the receive coil to receive the target signal and the undesired coupling signal, and a second input coupled to the matching network to receive the adjusted transmit signal. The output stage subtracts the adjusted detection signal from the target signal and the undesired coupling signal so that the target signal remains.
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Citations
15 Claims
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1. A detection apparatus comprising:
- a transmitter configured to generate a detection signal;
a coil assembly comprising a transmit coil coupled to said transmitter and configured to transmit the detection signal toward an object to be detected, with the object to be detected emitting a target signal in response to the transmitted detection signal, and a single receive coil adjacent said transmit coil and configured to receive the target signal emitted from the object along with an undesired coupling signal from said transmit coil;
a matching network coupled to said transmitter and configured to generate an adjusted detection signal by adjusting a profile of the detection signal to match a profile of the undesired coupling signal;
wherein the matching network comprises an amplitude stage coupled to a filter stage; and
an output stage having a first input coupled to said single receive coil to receive the target signal and the undesired coupling signal, and a second input coupled to said matching network to receive the adjusted transmit signal, and configured to subtract the adjusted detection signal from the target signal and the undesired coupling signal so that the target signal remains. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a transmitter configured to generate a detection signal;
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9. A method for operating a detection apparatus comprising a transmitter, a coil assembly comprising a transmit coil coupled to the transmitter and a single receive coil adjacent the transmit coil, a matching network coupled to the transmitter, and an output stage having a first input coupled to the single receive coil and a second input coupled to the matching network, wherein the matching network comprises an amplitude stage coupled to a filter stage;
- the method comprising;
operating the transmitter to generate a detection signal;
transmitting the detection signal from the transmit coil toward an object to be detected, with the object to be detected emitting a target signal in response to the transmitted detection signal;
receiving on the single receive coil the target signal emitted from the object along with an undesired coupling signal from the transmit coil;
operating the matching network to generate an adjusted detection signal by adjusting a profile of the detection signal to match a profile of the undesired coupling signal; and
operating the output stage to subtract the adjusted detection signal from the target signal and the undesired coupling signal so that the target signal remains. - View Dependent Claims (10, 11, 12, 13, 14, 15)
- the method comprising;
Specification