WO2000020850A1 - Multi-sensor device for gravimetric chemical measurements by means of resonant piezoelectric layers by thick film technology - Google Patents
Multi-sensor device for gravimetric chemical measurements by means of resonant piezoelectric layers by thick film technology Download PDFInfo
- Publication number
- WO2000020850A1 WO2000020850A1 PCT/EP1999/006957 EP9906957W WO0020850A1 WO 2000020850 A1 WO2000020850 A1 WO 2000020850A1 EP 9906957 W EP9906957 W EP 9906957W WO 0020850 A1 WO0020850 A1 WO 0020850A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- substrate
- sensors
- titanate
- compounds
- thick film
- Prior art date
Links
- 238000005516 engineering process Methods 0.000 title claims abstract description 8
- 238000005259 measurement Methods 0.000 title description 5
- 239000000126 substance Substances 0.000 title description 5
- 239000000758 substrate Substances 0.000 claims abstract description 35
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052451 lead zirconate titanate Inorganic materials 0.000 claims abstract description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 230000003321 amplification Effects 0.000 claims abstract description 3
- 230000005540 biological transmission Effects 0.000 claims abstract description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 3
- 238000011282 treatment Methods 0.000 claims abstract description 3
- 150000001875 compounds Chemical class 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 4
- 238000007650 screen-printing Methods 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 229910000464 lead oxide Inorganic materials 0.000 claims 1
- 230000004044 response Effects 0.000 description 8
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000012491 analyte Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000010304 firing Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- -1 poly(N- vinylpyrrolidone) Polymers 0.000 description 2
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 206010070834 Sensitisation Diseases 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013626 chemical specie Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 229920000191 poly(N-vinyl pyrrolidone) Polymers 0.000 description 1
- 229920000962 poly(amidoamine) Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 229940116411 terpineol Drugs 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 230000000699 topical effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
- G01G3/13—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing having piezoelectric or piezoresistive properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/025—Change of phase or condition
- G01N2291/0256—Adsorption, desorption, surface mass change, e.g. on biosensors
Definitions
- the present invention relates to a device for detecting, measuring and monitoring a plurality of gaseous and/or vapor state analytes, based on resonant piezoelectric elements, by means of a thick film technology.
- a device for detecting, measuring and monitoring a plurality of gaseous and/or vapor state analytes, based on resonant piezoelectric elements by means of a thick film technology.
- the availability of chemical sensors having a good metrologic performance and low realization cost is required by many application situations.
- the detection of gaseous compounds and vapors in the air is an object of deep and topical interest for the environment monitoring, and for measurements in domestic and industrial environments .
- Object of this invention is to provide a device for the detection, measurement and monitoring of gaseous and/or vapor state analytes different from one another and present at the same time in given environments, with high sensitivity and high selectivity and specificity.
- Another object of the invention is to provide a flexible, low cost multi-sensor device for gravimetric chemical measurements.
- a device for detecting and measuring gaseous and/or vapor state analytes, based on resonant piezoelectric layers which device, according to the present invention, comprises: - a substrate, a plurality of sensors made from piezoelectric elements based on compounds of polarized ferroelectric ceramics, realized by means of a thick film technology on said substrate and coated with sensitive coatings suitable to selectively and reversibly absorb said analytes, at least a heating element incorporated in said substrate, provided with a suitable regulation circuit apt to thermostate said substrate, suitable circuits being also provided for the amplification, transmission and elaboration of the signals emitted by the sensors and suitable means for the treatment and electronic data processing and/or software.
- said substrate is made from alumina.
- the substrate may be also made from any other suitably insulated material, such as an enameled metal material, for instance enameled steel or the like.
- said compounds of ferroelectric ceramics are made from lead zirconate-titanate, and are realized by silk-screen printing on said substrate from alumina.
- the thick film technology allows to realize electronic devices and circuits by means of silk-screen printing processes of pastes having specific and different properties on suitable substrates, followed by thermal cycles to stabilize the mechanical and functional properties of the deposits.
- the base material employed as an active phase for the preparation of the piezoelectric elements is lead zirconate-titanate of various compositions and particle sizes .
- a binder is added to the powder lead zirconate- titanate, generally made from lead oxide (PbO) powder or vitreous compounds, to promote the compacting of lead zirconate-titanate and its adhesion to the substrate during firing.
- the mixture made from lead zirconate-titanate and the binder is then dissolved in a liquid carrier made from an organic solvent and a thickener, typically ethyl cellulose in terpineol, to obtain a fluid compound having the right rheology to allow silk-screen printing. After the printing, the layers are dried at about 150 °C and then submitted to a firing process at about 950°C.
- the piezoelectric activity is induced in the layers by means of a polarization process, namely the application of an electric field in the order of 4-5 MV/m for about 10 minutes, at a temperature near the Curie one (the typical values employed range from 100 to 200°C) , followed by the return to ambient temperature with the applied field.
- a polarization process namely the application of an electric field in the order of 4-5 MV/m for about 10 minutes, at a temperature near the Curie one (the typical values employed range from 100 to 200°C) , followed by the return to ambient temperature with the applied field.
- the piezoelectric and mechanical characteristics of the film depend on the composition of the paste and the mean particle size of the powders (typically comprised
- the lead zirconate-titanate based resonant sensor on alumina substrate allows to detect small mass amounts integral with the vibrating structure through the decrease in the resonance frequency of the product, and can therefore advantageously detect a chemical species by means of the sensitization of the resonator with a material capable of reversibly absorbing the analyte of interest, with ensuing variation in its own mass.
- the material that makes up said sensitive coatings that cover said piezoelectric elements and that are capable of reversibly absorbing the analyte of interest is generally a polymeric material, selected according to the analyte to be detected and measured.
- the substrate from alumina has an active role in the determination of the resonance frequency measured, which is not due to the piezoelectric layer only, but to the substrate/piezoelectric layer whole which constitutes therefore a composite resonator: in fact, it has been found that a reduction in the thickness of the substrate leads to an increase in resonance frequency and, correspondingly, in mass sensitivity.
- piezoelectric layer having a thickness of about 100 ⁇ m
- the frequency is of about 6,5 MHz and the sensitivity of -450 kHz/ g, which value is a remarkable result.
- the device according to the invention is a gravimetric multi-sensor on one only substrate.
- Each microbalance of the whole is typically coated with a different sensitive material, so as to obtain for each analyte a range of different and complementary responses, to allow the detection through a suitable electronic processing and/or software.
- the methods for processing response signals are complementary to the gravimetric multi-sensor system according to the present invention.
- the device according to the invention comprises a substrate 1 from alumina of 2.5 x 2.5 cm.
- Four resonant piezoelectric layer sensors 2a, 2b, 2c and 2d from lead zirconate-titanate having a circular shape are present on substrate 1, near the corners of said substrate 1.
- the piezoelectric element 2a is coated with poly(N- vinylpyrrolidone) and is sensitive to relative humidity; element 2b is coated with poly (amidoamine) and is sensitive to sulfur dioxide; element 2c is coated with polystyrene and is sensitive to aromatic hydrocarbons (e.g., toluene), while element 2d is coated with poly (ethylenglicole) and is sensitive to aliphatic hydrocarbons (for instance, hexane) .
- the meander-shaped, metal-based heating element 3 is also present in the central region of the substrate, according to a cross-geometry, to optimize symmetry.
- sensor 2b of the example is sensitive to S0 2 , but not only to it; in particular the sensitivity to S0 2 is appraisably affected, for instance, by the content of relative humidity of the environment (sensed by 2a) . This fact is due to the complexity of the chemical reactions involved in the analyte detection process which prevents an absolute response specificity.
- the device according to the present invention provides an economical way to solve such problem as, to go back to the specific example, one would not be able to tell, from the response of the individual sensor 2b, if said response is originated by S0 2 , humidity or a mixture of the same.
- the response of 2a allows to determine the humidity content and therefore to separate from the signal of 2b only the contribution due to S0 2 .
- the device according to the invention provides with respect to those of the known art - are in particular the following ones: - the resonant piezoelectric layer sensing elements are planar, hence they need no additional and particular working steps; the realization of multi-sensor matrices is technically easy and economical; - thermostating carefully all the matrix of the multi- sensor matrix is technically feasible and advantageous, as the thick film technology often allows to realize heating elements having widely variable geometries and sizes, and their localization on the same high thermal conductivity alumina substrate whereon sensors are placed maximizes the effectiveness of temperature regulation, keeping power consumption low;
- the system is miniaturized, compact, sturdy, without moving parts and has a low realization cost, even by reduced production volumes.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Acoustics & Sound (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU64662/99A AU6466299A (en) | 1998-10-07 | 1999-09-21 | Multi-sensor device for gravimetric chemical measurements by means of resonant piezoelectric layers by thick film technology |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT002153 IT1302616B1 (it) | 1998-10-07 | 1998-10-07 | Dispositivo multisensore per misure chimiche gravimetriche mediantestrati piezoelettrici risonanti in tecnologia a film spesso. |
ITMI98A002/153 | 1998-10-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000020850A1 true WO2000020850A1 (en) | 2000-04-13 |
Family
ID=11380822
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/006957 WO2000020850A1 (en) | 1998-10-07 | 1999-09-21 | Multi-sensor device for gravimetric chemical measurements by means of resonant piezoelectric layers by thick film technology |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU6466299A (it) |
IT (1) | IT1302616B1 (it) |
WO (1) | WO2000020850A1 (it) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004070335A1 (en) * | 2003-02-05 | 2004-08-19 | Brunel University | Resonant sensor assembly |
WO2006078229A1 (en) * | 2004-10-17 | 2006-07-27 | Board Of Regents Of The University And Community College System Of Nevada | Self-sensing array of microcantilevers for chemical detection |
GB2432001A (en) * | 2003-10-17 | 2007-05-09 | Nevada System Of Higher Education | Self-sensing array of microcantilevers for chemical detection |
US7279131B2 (en) | 2004-07-01 | 2007-10-09 | Uop Llc | Method and apparatus for mass analysis of samples |
WO2009141516A1 (fr) * | 2008-05-20 | 2009-11-26 | Commissariat A L'energie Atomique | Dispositif pour la detection gravimetrique de particules en milieu fluide, comprenant un oscillateur traverse par une veine fluidique, procede de realisation et methode de mise en oeuvre du dispositif. |
WO2009141515A1 (fr) * | 2008-05-20 | 2009-11-26 | Commissariat A L'energie Atomique | Dispositif pour la detection gravimetrique de particules en milieu fluide comprenant un oscillateur entre deux canaux fluidiques, procede de realisation et methode de mise en oeuvre du dispositif |
US7694346B2 (en) | 2004-10-01 | 2010-04-06 | Board Of Regents Of The Nevada System Of Higher Education On Behalf Of The University Of Nevada | Cantilevered probe detector with piezoelectric element |
RU2486498C2 (ru) * | 2011-08-03 | 2013-06-27 | Федеральное государственное военное образовательное учреждение высшего профессионального образования "Военный авиационный инженерный университет" (г. Воронеж) Министерства обороны Российской Федерации | Способ измерения относительной влажности воздуха |
US10156585B2 (en) | 2003-03-11 | 2018-12-18 | Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The University Of Nevada, Reno | Cantilevered probes having piezoelectric layer, treated section, and resistive heater, and method of use for chemical detection |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4719441A (en) * | 1985-02-26 | 1988-01-12 | Navasina Ag | Sensor for measuring electrical conductivity |
EP0603945A1 (en) * | 1992-12-23 | 1994-06-29 | ENIRICERCHE S.p.A. | Gas sensor based on semiconductor oxide, for gaseous hydrocarbon determination |
-
1998
- 1998-10-07 IT IT002153 patent/IT1302616B1/it active IP Right Grant
-
1999
- 1999-09-21 WO PCT/EP1999/006957 patent/WO2000020850A1/en active Application Filing
- 1999-09-21 AU AU64662/99A patent/AU6466299A/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4719441A (en) * | 1985-02-26 | 1988-01-12 | Navasina Ag | Sensor for measuring electrical conductivity |
EP0603945A1 (en) * | 1992-12-23 | 1994-06-29 | ENIRICERCHE S.p.A. | Gas sensor based on semiconductor oxide, for gaseous hydrocarbon determination |
Non-Patent Citations (4)
Title |
---|
ALTHAINZ P ET AL: "MULTISENSOR MICROSYSTEM FOR CONTAMINANTS IN AIR", SENSORS AND ACTUATORS B,CH,ELSEVIER SEQUOIA S.A., LAUSANNE, vol. B33, no. 1/03, 1996, pages 72-76, XP000632926, ISSN: 0925-4005 * |
MORTEN B ET AL: "A THICK-FILM RESONANT SENSOR FOR HUMIDITY MEASUREMENTS", SENSORS AND ACTUATORS A,CH,ELSEVIER SEQUOIA S.A., LAUSANNE, vol. A37-A38, June 1993 (1993-06-01), pages 337-342, XP000411411, ISSN: 0924-4247 * |
QU W ET AL: "DICKSCHICHT-GASSENSOREN IN INTEGRIERTER ANORDNUNG", TECHNISCHES MESSEN TM,DE,R.OLDENBOURG VERLAG. MUNCHEN, vol. 63, no. 11, November 1996 (1996-11-01), pages 425-429, XP000679685, ISSN: 0171-8096 * |
V. FERRARI ET AL.: "Gravimetric chemical sensors in thick-film technology with hybrid electronics", CONFERENCE PROCEEDINGS. SAA '96 NATIONAL MEETING ON SENSORS FOR ADVANCED APPLICATIONS, BRESCIA, ITALY, 16-17 MAY 1996, vol. 54, 1997, pages 3 - 10, XP000865731 * |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004070335A1 (en) * | 2003-02-05 | 2004-08-19 | Brunel University | Resonant sensor assembly |
US7498721B2 (en) | 2003-02-05 | 2009-03-03 | Brunel University | Resonant sensor assembly |
US10156585B2 (en) | 2003-03-11 | 2018-12-18 | Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The University Of Nevada, Reno | Cantilevered probes having piezoelectric layer, treated section, and resistive heater, and method of use for chemical detection |
GB2432001A (en) * | 2003-10-17 | 2007-05-09 | Nevada System Of Higher Education | Self-sensing array of microcantilevers for chemical detection |
US8524501B2 (en) | 2003-10-17 | 2013-09-03 | Board Of Regents Of The Nevada System Of Higher Education | Self-sensing array of microcantilevers for chemical detection |
GB2432001B (en) * | 2003-10-17 | 2009-04-15 | Nevada System Of Higher Education | Self-sensing array of microcantilevers for chemical detection |
US7279131B2 (en) | 2004-07-01 | 2007-10-09 | Uop Llc | Method and apparatus for mass analysis of samples |
US7533587B2 (en) | 2004-07-01 | 2009-05-19 | Uop Llc | Method and apparatus for mass analysis of samples |
US7533586B2 (en) | 2004-07-01 | 2009-05-19 | Uop Llc | Method and apparatus for mass analysis of samples |
US10473636B2 (en) | 2004-10-01 | 2019-11-12 | Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The University Of Nevada | Cantilevered probe detector with piezoelectric element |
US8713711B2 (en) | 2004-10-01 | 2014-04-29 | Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The University Of Nevada | Cantilevered probe detector with piezoelectric element |
US7694346B2 (en) | 2004-10-01 | 2010-04-06 | Board Of Regents Of The Nevada System Of Higher Education On Behalf Of The University Of Nevada | Cantilevered probe detector with piezoelectric element |
US8434161B1 (en) | 2004-10-01 | 2013-04-30 | Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The University Of Nevada | Cantilevered probe detector with piezoelectric element |
US8434160B1 (en) | 2004-10-01 | 2013-04-30 | Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The University Of Nevada | Cantilevered probe detector with piezoelectric element |
WO2006078229A1 (en) * | 2004-10-17 | 2006-07-27 | Board Of Regents Of The University And Community College System Of Nevada | Self-sensing array of microcantilevers for chemical detection |
FR2931550A1 (fr) * | 2008-05-20 | 2009-11-27 | Commissariat Energie Atomique | Dispositif pour la detection gravimetrique de particules en milieu fluide comprenant un oscillateur entre deux canaux fluidiques, procede de realisation et methode de mise en oeuvre du dispositif |
FR2931549A1 (fr) * | 2008-05-20 | 2009-11-27 | Commissariat Energie Atomique | Dispositif pour la detection gravimetrique de particules en milieu fluide, comprenant un oscillateur traverse par une veine fluidique, procede de realisation et methode de mise en oeuvre du dispositif |
US8746048B2 (en) | 2008-05-20 | 2014-06-10 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Device for the gravimetric detection of particles in a fluid medium, comprising an oscillator between two fluid channels |
US8844340B2 (en) | 2008-05-20 | 2014-09-30 | Commissariat a l'Energie et aux Energies Alternatives | Device for the gravimetric detection of particles in a fluid medium, comprising an oscillator over which a fluid stream flows, production process and method of employing the device |
WO2009141515A1 (fr) * | 2008-05-20 | 2009-11-26 | Commissariat A L'energie Atomique | Dispositif pour la detection gravimetrique de particules en milieu fluide comprenant un oscillateur entre deux canaux fluidiques, procede de realisation et methode de mise en oeuvre du dispositif |
WO2009141516A1 (fr) * | 2008-05-20 | 2009-11-26 | Commissariat A L'energie Atomique | Dispositif pour la detection gravimetrique de particules en milieu fluide, comprenant un oscillateur traverse par une veine fluidique, procede de realisation et methode de mise en oeuvre du dispositif. |
RU2486498C2 (ru) * | 2011-08-03 | 2013-06-27 | Федеральное государственное военное образовательное учреждение высшего профессионального образования "Военный авиационный инженерный университет" (г. Воронеж) Министерства обороны Российской Федерации | Способ измерения относительной влажности воздуха |
Also Published As
Publication number | Publication date |
---|---|
ITMI982153A1 (it) | 2000-04-07 |
IT1302616B1 (it) | 2000-09-29 |
AU6466299A (en) | 2000-04-26 |
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SU1763960A1 (ru) | Датчик относительной влажности и температуры |
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