Method of interrogating a sensor of surface acoustic wave type

摘要

A method of interrogating sensors of SAW type, which allows notably the gathering of physical measurements of parameters carried out by SAW sensors, the method for gathering the measurement of an SAW sensor comprising a first step of generating and emitting an electromagnetic signal corresponding to the dilated time-reversal of a dilation coefficient k, of an impulse response signature which is characteristic of the SAW sensor, a second step of gathering a signal received as echo originating from the SAW sensor, a third step of determining a maximum of cross-correlation of the signal received as echo during the second step, the first step being applied with a set of values of the dilation coefficient k in a determined domain, the measurement of a physical parameter then being determined by the dilation coefficient k for which the power or the amplitude of the signal gathered as echo is a maximum.

主权项

1. A method of interrogating an acoustic 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 related to an impulse response signature, the electromagnetic signal being a time-reversal and a time-dilation, by a dilation coefficient k, of the impulse response signature, said impulse response signature being associated with an echo to a determined impulse signal, the impulse response signature being characteristic of said acoustic sensor, wherein the time-reversal includes mirroring the impulse response signature about a time axis and the time-dilation includes a scaling along a time axis of the impulse response signature based upon the dilation coefficient k, a second step of gathering a signal received as the echo of the electromagnetic 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.