G01K 11/26 - Measuring temperature based on physical or chemical changes not covered by group , , , or using measurement of acoustic effects of resonant frequencies
G01K 1/02 - Means for indicating or recording specially adapted for thermometers
G08C 17/02 - Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
G01K 7/32 - Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat using change of resonant frequency of a crystal
G01L 1/16 - Measuring force or stress, in general using properties of piezoelectric devices
H01Q 1/22 - SupportsMounting means by structural association with other equipment or articles
G01L 9/00 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elementsTransmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
G01D 5/48 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using wave or particle radiation means
2.
Acoustic wave H2S sensor comprising a polymer film comprising carboxylate functional groups and lead or zinc cations and manufacturing process
G01N 33/00 - Investigating or analysing materials by specific methods not covered by groups
B06B 1/06 - Processes or apparatus for generating mechanical vibrations of infrasonic, sonic or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
C08L 33/06 - Homopolymers or copolymers of esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
H04B 5/00 - Near-field transmission systems, e.g. inductive or capacitive transmission systems
G01K 11/26 - Measuring temperature based on physical or chemical changes not covered by group , , , or using measurement of acoustic effects of resonant frequencies
H03H 9/145 - Driving means, e.g. electrodes, coils for networks using surface acoustic waves
H03H 9/17 - Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
H03H 9/19 - Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator consisting of quartz
H03H 9/25 - Constructional features of resonators using surface acoustic waves
B60C 23/04 - Signalling devices actuated by tyre pressure mounted on the wheel or tyre
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.
H04Q 5/22 - Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange with indirect connection, i.e. through subordinate switching centre the subordinate centre not permitting interconnection of subscribers connected thereto
H03B 7/14 - Generation of oscillations using active element having a negative resistance between two of its electrodes with frequency-determining element comprising distributed inductance and capacitance active element being semiconductor device
G06K 7/10 - Methods or arrangements for sensing record carriers by electromagnetic radiation, e.g. optical sensingMethods or arrangements for sensing record carriers by corpuscular radiation
G01K 11/26 - Measuring temperature based on physical or chemical changes not covered by group , , , or using measurement of acoustic effects of resonant frequencies
G01S 13/75 - Systems using reradiation of radio waves, e.g. secondary radar systemsAnalogous systems using transponders powered from received waves, e.g. using passive transponders
5.
LOW-COST PRESSURE AND TEMPERATURE SENSOR COMPRISING SAW RESONATORS, AND METHOD FOR MANUFACTURING SAME
The invention relates to a pressure and temperature sensor including at least one first SAW resonator (R11, R21) comprising a membrane-like piezoelectric substrate which is at least locally thinned, a second SAW resonator (R21, R22) including a piezoelectric substrate, and a third SAW resonator (R31, R32) including a piezoelectric substrate, characterized in that the first, second and third resonators are at the surface of a first, second and third piezoelectric unit substrates, respectively, each of the unit substrates being positioned at the surface of a common base (E), locally bored under said first resonator (R11) so as to expose the substrate of said resonator in order to render the latter operational for measuring pressure. The invention also relates to a method for manufacturing such a sensor.
G01L 9/00 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elementsTransmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
G01L 19/00 - Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
6.
TRANSPONDER HAVING COUPLED RESONANT MODES AND INCLUDING A VARIABLE LOAD
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (France)
UNIVERSITE DE FRANCHE COMTE (France)
Inventor
Ballandras, Sylvain
Daniau, William
Leguen, Jean-François
Abstract
The invention relates to a transponder comprising at least one first resonator (R1) and a series of second evanescent wave-coupling resonators (R2) having at least a first and a second resonant mode, said first resonator being connected, via a first port, to a first means enabling querying (antenna, wired link), characterized in that said second resonator(s) are connected, via at least one second port, to at least one variable-load element (ECV) capable of modifying the coupling conditions of the resonant modes and consequently the response measured over said first port.
The invention relates to a process for the collective fabrication of a remotely interrogable sensor having at least one first resonator and one second resonator. Each resonator exhibits respectively a first and a second operating frequency. A first series of first resonators are fabricated. The first resonators each have a first operating frequency belonging to a first set of frequencies centered on a first central frequency. A second series of second resonators are fabricated. The second resonators each having a second operating frequency belonging to a second set of frequencies centered on a second central frequency. A series of pairings of a first resonator and of a second resonator are conducted so as to form pairs of resonators exhibiting a difference of operating frequencies which is equal to the difference of the first and second central frequencies.
2), said arrays being situated on either side of said transducer, characterized in that the two arrays of reflectors exhibit nonsymmetric configurations with respect to the central axis of said central transducer.
3, etc.).
The invention relates to a pressure and/or temperature measuring device that can be remotely addressed and comprises at least: an acoustic wave sensor including at least one resonator coupled to a first antenna member; an addressing system including a second transmission and reception antenna member, characterised in that it includes an expansible tubular structure (42), wherein said structure comprises a biocompatible material (46) with the acoustic wave sensor (36, 38, 40) encapsulated in the biocompatible material, and in that the second antenna member operates at frequencies higher than several tens of Megahertz.
The invention relates to a method for querying a passive sensor that comprises at least one piezoelectric resonator, characterised in that the method comprises the following steps: identifying the characteristic width of the resonance frequency band of the resonator Δf0S; determining a scanning pitch equal to a third of the measured bandwidth Δf = Δf0S /3; performing a first series of three querying measures with signals having a first frequency (f1), a second frequency (f2) and a third frequency (f3), respectively, in order to determine a first resonance value (y1), a second resonance value (y2) and a third resonance value (y3); determining by a parabolic fit operation the response curve of the resonator from said first, second and third resonance values in order to calculate a first real-time frequency value (f01) of the resonator. The invention also relates to an electronic device for querying a passive sensor including at least one piezoelectric resonator, and including a micro-controller for implementing the querying method of the present invention.
The invention relates to a remotely testable passive sensor that comprises an antenna and at least one surface-wave resonator (R, P, T) including a transducer with electrodes interdigited with two ports (p1 , p2) at the surface of a piezoelectric substrate (S), characterised in that the antenna includes conducting members (B1, B2) connected to the two ports and integrated onto said piezoelectric substrate. Advantageously, the antenna members are folded back onto the substrate in order to improve compactness. The passive sensor can be used in medical applications of the tissue-analysis of blood-pressure measurement types.
G01L 9/00 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elementsTransmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
12.
STRESS GAUGE HAVING AN ACOUSTIC RESONANT STRUCTURE AND SENSOR FOR AT LEAST ONE PHYSICAL PARAMETER USING SUCH STRESS GAUGE
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (France)
SENSEOR (France)
Inventor
Ballandras, Sylvain Jean
Masson, Jérémy
Abstract
The invention relates to a stress gauge of the type having an acoustic resonant structure, including a piezoelectric transducer (10) connected to a holder (20), the holder (20) including opposite the piezoelectric transducer (10) an imbedded reflecting portion (40). The imbedded reflecting portion (40) reflects the volume acoustic waves generated by the piezoelectric transducer (10) when it is excited according to a harmonic mode of the structure and propagating into said holder (20), the reflecting portion (40) being arranged at a distance from the piezoelectric transducer (10) such that the integral of the stress on the propagation distance of the volume acoustic waves up to their reflection is different from zero.
G01L 1/16 - Measuring force or stress, in general using properties of piezoelectric devices
G01L 1/25 - Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, neutrons
G01L 3/10 - Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
G01L 5/16 - Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
G01L 9/00 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elementsTransmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
The invention relates to a surface acoustic wave resonator produced on a cut substrate with propagation axes for which a non-zero directivity exists and comprising at least one central transducer (Tc) having a central axis, a first array of reflectors (R1) and a second array of reflectors (R2), said arrays being located on either side of said transducer, characterized in that the two arrays of reflectors have configurations that are unsymmetrical with respect to the central axis of said central transducer. By introducing an asymmetry it is possible to greatly produce the parasitic resonances that can appear when the resonators are made in particular on piezoelectric substrates of the quartz type or made of any other material, and cut with propagation axes for which a natural directivity exists (LiTaO3, LiNbO3, langasite, GaPO4, LiB4O7, KNbO3, etc.)
The invention relates to a process for the collective fabrication of a remotely interrogable sensor and comprising at least first and second resonators, each resonator having first and second operating frequencies respectively, characterized in that the process comprises the following steps: the fabrication of a first series of first resonators, said resonators each having a first operating frequency falling within a first set of frequencies centred on a first central frequency; the fabrication of a second series of second resonators, said second resonators each having a second operating frequency falling within a second set of frequencies centred on a second central frequency; a series of pairings of a first resonator with a second resonator so as to form pairs of resonators having a difference in operating frequency equal to the difference between the first and second central frequencies.
G01K 7/32 - Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat using change of resonant frequency of a crystal
G01K 11/26 - Measuring temperature based on physical or chemical changes not covered by group , , , or using measurement of acoustic effects of resonant frequencies
15.
DEVICE FOR INTERROGATING A PASSIVE SENSOR OF THE SURFACE ACOUSTIC-WAVE TYPE
The invention relates to a device for remotely interrogating the resonance frequencies of a passive sensor, said device comprising means for transmitting an interrogation signal at a plurality of frequencies to said passive sensor, means for receiving a signal including the resonance frequencies of the passive sensor, means for analysing said frequencies, wherein the transmission signal is a continuous signal, and further comprising a demodulator and a low-pass filter for selecting a band of frequencies centred on the resonance frequency of the passive sensor.
G06K 7/08 - Methods or arrangements for sensing record carriers by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
patents
