A method of interrogating a sensor comprising at least two resonators whose natural resonant frequency (f 1, f 2) is dependent on a physical parameter, the method comprising: a step of emitting an electromagnetic signal whose frequency (f) is varied in a frequency band by increments of determined value (f), from a predetermined minimum value to a predetermined maximum value, the frequency band being split into two frequency sub-bands, each frequency sub-band containing at least the expected values respectively of each natural resonant frequency (f 1, f 2) of the two resonators, a step of gathering a signal received as an echo after a determined duration after the emission carried out in the emission step, for each frequency (f) of the electromagnetic signal emitted, characterised in that it also comprises: a step of transposing the signal received as the echo to low frequency by mixing with a radiofrequency signal whose frequency equals the frequency (f) of the electromagnetic signal emitted, a filtering step to eliminate the high frequencies of the signal mixed in the transposition step, a step of determining the difference between the respective natural resonant frequencies (f 1, f 2) of the said two resonators, on the basis of the cross-correlation maximum of the characteristics of the level of the signal (s 1, s 2) received as the echo for each frequency sub-band as a function of the frequency of the electromagnetic signal emitted. a step of emitting an electromagnetic signal whose frequency (f) is varied in a frequency band by increments of determined value (f), from a predetermined minimum value to a predetermined maximum value, the frequency band being split into two frequency sub-bands, each frequency sub-band containing at least the expected values respectively of each natural resonant frequency (f 1, f 2) of the two resonators, a step of gathering a signal received as an echo after a determined duration after the emission carried out in the emission step, for each frequency (f) of the electromagnetic signal emitted, characterised in that it also comprises: a step of transposing the signal received as the echo to low frequency by mixing with a radiofrequency signal whose frequency equals the frequency (f) of the electromagnetic signal emitted, a filtering step to eliminate the high frequencies of the signal mixed in the transposition step, a step of determining the difference between the respective natural resonant frequencies (f 1, f 2) of the said two resonators, on the basis of the cross-correlation maximum of the characteristics of the level of the signal (s 1, s 2) received as the echo for each frequency sub-band as a function of the frequency of the electromagnetic signal emitted. a step of transposing the signal received as the echo to low frequency by mixing with a radiofrequency signal whose frequency equals the frequency (f) of the electromagnetic signal emitted, a filtering step to eliminate the high frequencies of the signal mixed in the transposition step, a step of determining the difference between the respective natural resonant frequencies (f 1, f 2) of the said two resonators, on the basis of the cross-correlation maximum of the characteristics of the level of the signal (s 1, s 2) received as the echo for each frequency sub-band as a function of the frequency of the electromagnetic signal emitted.