Patent ID: 7208945

Claim:
A sensor for sensing a parameter and for providing a value representative of the parameter being sensed, the sensor comprising: an excitation winding; a resonator; a sensor winding electromagnetically coupled to the excitation winding via the resonator; a signal generator operable to generate an excitation signal and arranged to apply the generated excitation signal to the excitation winding in order to generate a periodic electric signal in the sensor winding indicative of the value of the parameter to be measured by the sensor, wherein the excitation signal comprises a periodic carrier signal having a first frequency, which is operable to induce a resonant signal in the resonator, modulated by a periodic modulation signal having a second frequency, the first frequency being greater than the second frequency; a demodulator operable to demodulate the electric signal generated in the sensor winding to obtain a signal at the second frequency; and a signal processor operable to process said signal at the second frequency to determine a value representative of the parameter being measured.