Detection apparatus with a matching network for nulling and associated methods
US8781772B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2011 |
| Grant date | Jul 15, 2014 |
| Priority date | — |
| Expiry date | Aug 22, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/028
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.