Connect public, paid and private patent data with Google Patents Public Datasets

Capacitive-impedance type humidity/moisture sensing apparatus and method

Info

Publication number
WO2001090732A3
WO2001090732A3 PCT/US2001/040304 US0140304W WO2001090732A3 WO 2001090732 A3 WO2001090732 A3 WO 2001090732A3 US 0140304 W US0140304 W US 0140304W WO 2001090732 A3 WO2001090732 A3 WO 2001090732A3
Authority
WO
Grant status
Application
Patent type
Prior art keywords
moisture
capacitor
gas
impedance
sensing
Prior art date
Application number
PCT/US2001/040304
Other languages
French (fr)
Other versions
WO2001090732A2 (en )
Inventor
Gerald Cooper
Original Assignee
Matheson Tri Gas Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
    • G01N27/02Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means by investigating the impedance of the material
    • G01N27/22Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means by investigating the impedance of the material by investigating capacitance
    • G01N27/223Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means by investigating the impedance of the material by investigating capacitance for determining moisture content, e.g. humidity
    • G01N27/225Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means by investigating the impedance of the material by investigating capacitance for determining moisture content, e.g. humidity by using hygroscopic materials

Abstract

The moisture content of a gas is sensed by subjecting a moisture-sensing capacitor to the gas and then measuring the impedance of the capacitor. The moisture-sensing capacitor comprises a pair of closely spaced, porous, and parallel metal electrodes having a thin coating of a water-absorbing dielectric, such as zeolite therebetween. In a two-sensor system, the impedance of a dry reference capacitor is differentially compared to the impedance of the moisture-sensing capacitor in order to eliminate any effects that variations in gas temperature and/or gas pressure may have on the measurement of the moisture content of the gas.
PCT/US2001/040304 2000-05-10 2001-03-15 Capacitive-impedance type humidity/moisture sensing apparatus and method WO2001090732A3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US56911200 true 2000-05-10 2000-05-10
US09/569,112 2000-05-10

Publications (2)

Publication Number Publication Date
WO2001090732A2 true WO2001090732A2 (en) 2001-11-29
WO2001090732A3 true true WO2001090732A3 (en) 2003-02-13

Family

ID=24274148

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/040304 WO2001090732A3 (en) 2000-05-10 2001-03-15 Capacitive-impedance type humidity/moisture sensing apparatus and method

Country Status (1)

Country Link
WO (1) WO2001090732A3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010003710A1 (en) * 2010-04-08 2011-10-13 Endress + Hauser Gmbh + Co. Kg Method and apparatus for determining a proportion of an adsorbed substance contained in an adsorber
WO2015014379A1 (en) * 2013-08-02 2015-02-05 Universität Duisburg-Essen Electrical capacitor comprising nanoparticles of a semiconductive material
CN103630582B (en) * 2013-12-11 2016-02-10 江苏物联网研究发展中心 Mems one kind of humidity sensor and method of preparation

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2976728A (en) * 1958-01-20 1961-03-28 Union Carbide Corp Electrolytic moisture measuring apparatus
US3315518A (en) * 1966-02-07 1967-04-25 Research Corp Humidity sensing devices
DE2536778A1 (en) * 1975-08-19 1977-03-03 Issel Wolfgang Continuous determination of plant water content - is for irrigation control using capacitive probe containing adsorption layer
US4876890A (en) * 1988-06-29 1989-10-31 Uop Moisture sensing apparatus and method
US5143696A (en) * 1989-11-04 1992-09-01 Dornier Gmbh Selective gas sensor
WO1997037288A1 (en) * 1996-03-29 1997-10-09 Netzer, Yohay A window capacitive moisture sensor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2976728A (en) * 1958-01-20 1961-03-28 Union Carbide Corp Electrolytic moisture measuring apparatus
US3315518A (en) * 1966-02-07 1967-04-25 Research Corp Humidity sensing devices
DE2536778A1 (en) * 1975-08-19 1977-03-03 Issel Wolfgang Continuous determination of plant water content - is for irrigation control using capacitive probe containing adsorption layer
US4876890A (en) * 1988-06-29 1989-10-31 Uop Moisture sensing apparatus and method
US5143696A (en) * 1989-11-04 1992-09-01 Dornier Gmbh Selective gas sensor
WO1997037288A1 (en) * 1996-03-29 1997-10-09 Netzer, Yohay A window capacitive moisture sensor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
G. J. SZEPAROWICZ: "continuous humidity monitor for large computer systems", IBM TECHNICAL DISCLOSURE BULLETIN, vol. 22, no. 10, 1980, pages 4652 - 4653, XP002206186 *

Also Published As

Publication number Publication date Type
WO2001090732A2 (en) 2001-11-29 application

Similar Documents

Publication Publication Date Title
Hanai et al. An investigation by electrical methods of lecithin-in-hydrocarbon films in aqueous solutions
US4772560A (en) Laminated wafer for sensing and monitoring exposure to gases
US4399687A (en) Apparatus for analyzing and identifying odorants
US4399684A (en) Gas measurement method
Gerhardt Impedance and dielectric spectroscopy revisited: distinguishing localized relaxation from long-range conductivity
Yamazoe et al. Humidity sensors: principles and applications
Sakai et al. Humidity sensor using cross-linked poly (chloromethyl styrene)
US6173602B1 (en) Transition metal oxide gas sensor
US6042634A (en) Moisture extractor system for gas sampling
Frietsch et al. CuO catalytic membrane as selectivity trimmer for metal oxide gas sensors
Endres et al. Optimization of the geometry of gas-sensitive interdigital capacitors
WO1996007901A1 (en) Odour sensor
US5969231A (en) Sensor for monitoring concentration of gaseous substances
US4549134A (en) Moisture probe and technique
US5522980A (en) Gas sensor and sensing device
Chvojka et al. Dual photometric-contactless conductometric detector for capillary electrophoresis
US4532797A (en) Instrumentation for sensing moisture content of material using a transient thermal pulse
Chou et al. Sensing mechanism of a porous ceramic as humidity sensor
Scorsone et al. Development of an electronic nose for fire detection
Basu et al. Study of electrical characteristics of porous alumina sensors for detection of low moisture in gases
US5777206A (en) Method and measuring device for determining the water content of a gas
US4755473A (en) Method of detecting carbon dioxide gas
US4858063A (en) Spiral configuration of electrodes and dielectric material for sensing an environmental property
CN1455250A (en) Capacitance type relative humidity sensor
WO2005023111A1 (en) Glucose sensor and glucose level measuring apparatus

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase in:

Ref country code: JP