Patent ID: 7205775

Claim:
An inductive sensor for sensing a parameter, the inductive sensor comprising: a magnetic field generator operable to generate a magnetic field; a receive aerial electromagnetically coupled to the magnetic field generator via a resonant circuit, said electromagnetic coupling being variable in dependence on the sensed parameter so that a sense signal induced in the receive aerial in response to a magnetic field generated by the magnetic field generator is representative of the sensed parameter, wherein the magnetic field generator is operable to generate a magnetic field comprising a first magnetic field component at a first frequency which is operable to induce resonance in the resonant circuit and a second magnetic field component at a second frequency which is not operable to induce resonance in the resonant circuit; and a signal processor operable to process the sense signal to generate a signal component corresponding to a first component of the sense signal at said first frequency adjusted using a second component of the sense signal at the second frequency, and to determine a value representative of the sensed parameter using the signal component.