Senseor

Centre National De La Recherche Scientifique

Total Sa

Université De Franche Comte

Total Se

Jean-Michel Friedt

Sylvain Ballandras

Christophe Droit

Gilles Martin

Luc Chommeloux

Jeremy Masson

Thibault Retornaz

Jérémy Masson

Simon Lamare

Frédéric Cherioux

François Gegot

An HS sensor includes at least one acoustic wave transducer and a film having a polymer matrix. The polymer matrix includes carboxylate functional groups and lead or zinc cations. The film may have a thickness of between a hundred nanometres and a 2 microns The HS sensor optionally includes an antenna to remotely interrogate the HS sensor.

Acoustic wave H2S sensor comprising a polymer film comprising carboxylate functional groups and lead or zinc cations and manufacturing process

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.

Method of interrogating a sensor of surface acoustic wave type

A system comprises a cavity being reflecting for RF waves and comprises at least one acoustic wave sensor exhibiting a resonance frequency band, coupled to a sensor antenna; and an interrogation/reception device for the sensor. The interrogation/reception device comprises: means for transmitting/receiving an RF signal transmitting within an interrogation frequency band comprising the resonance frequency band of the sensor; at least a first transmission/reception antenna and a second transmission antenna/reception, positioned within the cavity; means for dividing the signal into at least a first RF signal and a second RF signal, the first signal being transmitted to the first transmission/reception antenna and the second signal being transmitted to the second transmission/reception antenna; means for creating a phase-shift between the first RF signal and the second RF signal; means for analysing the power level of the received signal. An interrogation method used in the system is also provided.

System for interrogating a remotely interrogatable passive sensor integrated into a metal cavity with reduced system loss and interrogation method

A method of interrogating a surface acoustic wave differential sensor formed by two resonators is provided, wherein the method allows the measurement of a physical parameter by determination of the difference between the natural resonant frequencies of the two resonators, which difference is determined on the basis of the analysis of a signal representative of the level of a signal received as echo of an interrogation signal, for a plurality of values of a frequency of the interrogation signal in a domain of predetermined values; the analysis can be based on the cross-correlation of the said signal representative of the level according to a splitting into two distinct frequency sub-bands. An advantage is that it may be implemented in a radio-modem.

Method of interrogation of a differential sensor of acoustic type having two resonances and device implementing the method of interrogation

A method of remotely interrogating a passive sensor, comprising at least one resonator, so as to determine the resonant frequency of said resonator, having a resonant frequency response defined by the design of said resonator, includes: a preliminary frequency-scan step for interrogating said resonator over a frequency range allowing for the rapid determination of a first resonant frequency (fr) of said resonator by detecting the amplitude of the response signal of said resonator; a first step of a first couple of interrogations of said resonator at a first frequency (f) and a second frequency (f) such that: f=fr&#x2212;f/2 and f=fr+f/2, fbeing smaller than the width at half-maximum of the resonant frequency response defined by the design, allowing a first couple of amplitudes (Pf, Pf) of first and second reception signals to be defined; a second step of determining the amplitude difference (&#x394;(Pf&#x2212;Pf)), said difference being signed; a third step allowing a first resonant frequency (fr), controlled by said signed amplitude difference, to be defined and having the formula fr=fr+K*[&#x394;(Pf&#x2212;Pf)&#x2212;Ca], where Ca is a control set-point and K is a constant; and the reiteration of the first, second and third steps comprising the definition of an (i+1)th resonant frequency (fr) from an ith resonant frequency (fr) having the formula: fr=fr+K*[&#x394;(Pf&#x2212;Pf)&#x2212;Ca], so as to obtain a determined resonant frequency (fr) such that the signed amplitude difference (&#x394;(Pf&#x2212;Pf)) is equal to the control set-point (Ca).

Method of rapidly interrogating elastic wave sensors

A method for interrogating a passive sensor comprising at least one piezoelectric resonator includes the following steps: The invention also relates to an electronic device for interrogating a passive sensor comprising at least one piezoelectric resonator and comprising a micro-controller implementing the interrogation method of the invention.

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Besancon, France

Jean-Michel Friedt