Method of Interrogating a Sensor of Surface Acoustic Wave Type

A method of interrogating a sensor of surface acoustic wave type carrying out a measurement of at least one physical parameter, said method comprising:

• a first step of generating and emitting an electromagnetic signal corresponding to the time-reversal time-dilated by a dilation coefficient k, of an impulse response signature which is characteristic of said acoustic sensor corresponding to the signal received from the sensor as echo to a determined signal of impulse type,
• a second step of gathering a signal received as echo of the signal emitted during the first step,
• a third step of determining the maximum value of the amplitude or of the power of the said signal received as echo during the second step,
• said first step being applied in a new iteration with a dilation coefficient k increased or decreased by an amount of determined value, until said maximum value attains a maximum value,
• the measurement of said at least one physical parameter then being determined by the dilation coefficient k for which the maximum value is a maximum, and a coefficient of said physical parameter of the propagation delay of the surface waves which is characteristic of said acoustic sensor.