Patent ID: 8392128

Claim:
A method for interrogating a passive sensor having at least one piezoelectric resonator, the method comprising the following steps: identifying, via an electronic assembly, a characteristic width of a resonant frequency band of the at least one piezoelectric resonator Δf 0S ; determining, via the electronic assembly, a scan interval equal to a third of the identified characteristic bandwidth Δf=ΔF 0S /3; defining, via the electronic assembly, a first resonance value (Y 1 ), a second resonance value (Y 2 ) and a third resonance value (Y 3 ) based at least in part on a first series of three interrogation measurements, respectively, at a first frequency (f 1 ), at a second frequency (f 2 ) and at a third frequency (f 3 ); determining, via the electronic assembly using a parabolic fitting operation of a resonator response curve, a first value of a frequency in real time (f 01 ) of the at least one piezoelectric resonator based at least in part on the first, second and third resonance values.