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GB1288009A - - Google Patents

Info

Publication number
GB1288009A
GB1288009A GB1288009DA GB1288009A GB 1288009 A GB1288009 A GB 1288009A GB 1288009D A GB1288009D A GB 1288009DA GB 1288009 A GB1288009 A GB 1288009A
Authority
GB
United Kingdom
Prior art keywords
particles
semi
porous
conductor
electrodes
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
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
Application filed filed Critical
Publication of GB1288009A publication Critical patent/GB1288009A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

1288009 Gas detecting devices NAOYOSHI TAGUCHI 22 Sept 1970 45110/70 Heading G1N Reducing gases, e.g. hydrogen, propane, butane or smoke, are detected by a porous and permeable body of metal oxide semi-conductor material 4 provided with a pair of electrodes. As shown, one electrode is formed by a housing 2 and the other by a heater 12, the material 4 having rough-surfaced particles 6, e.g. quartz, alumina, dispersed therein to increase sensitivity. The device shown is made by press-shaping the powder at a temperature below the fusing or sintering point of the material 4. In an alternative, instead of the particles 6, the material 4 is first mixed with decomposable particles, e.g. of starch, and the mixture is press-shaped and heated to a temperature sufficient to burn away the starch particles leaving the block extremely porous. In further alternatives, Figs.2 to 9 (not shown), the device is formed by a housing enclosing material 4 and one or two electrodes, a pair of semi-cylindrical electrodes surrounding the material 4 and bonded by insulating pieces, and applying a film of the material 4 on a block of insulating material having an electrode at each end. The device may be manufactured by mixing powdered metal oxide semi-conductor material with stealic acid or other liquid organic substance to form a slurry which is coated on an insulating base, then heating to burn away the stealic acid thereby to leave the semi-conductor porous and permeable.
GB1288009D 1970-09-22 1970-09-22 Expired GB1288009A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4511070 1970-09-22

Publications (1)

Publication Number Publication Date
GB1288009A true GB1288009A (en) 1972-09-06

Family

ID=10435925

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1288009D Expired GB1288009A (en) 1970-09-22 1970-09-22

Country Status (2)

Country Link
GB (1) GB1288009A (en)
IE (1) IE35630B1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2468119A1 (en) * 1979-10-20 1981-04-30 Draegerwerk Ag GAS DETECTION ELEMENT FOR DETECTING THE PRESENCE OF HYDROGEN SULFIDE AND PROCESS FOR MAKING SAME
EP0280540A2 (en) * 1987-02-24 1988-08-31 American Intell-Sensors Corporation Method and apparatus for simultaneous detection of target gases in ambient air
GB2276726A (en) * 1993-03-30 1994-10-05 Univ Keele Gas and Vapour Sensor; Smoke Detector
US5427740A (en) * 1991-04-05 1995-06-27 British Gas Plc Tin oxide gas sensors
EP2752658A4 (en) * 2011-08-29 2015-03-04 Toyota Motor Co Ltd MICROPARTICLE SENSOR AND METHOD FOR MANUFACTURING MICROPARTICLE SENSOR

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2468119A1 (en) * 1979-10-20 1981-04-30 Draegerwerk Ag GAS DETECTION ELEMENT FOR DETECTING THE PRESENCE OF HYDROGEN SULFIDE AND PROCESS FOR MAKING SAME
EP0280540A2 (en) * 1987-02-24 1988-08-31 American Intell-Sensors Corporation Method and apparatus for simultaneous detection of target gases in ambient air
EP0280540A3 (en) * 1987-02-24 1989-12-06 American Intell-Sensors Corporation Method and apparatus for simultaneous detection of target gases in ambient air
US5427740A (en) * 1991-04-05 1995-06-27 British Gas Plc Tin oxide gas sensors
GB2276726A (en) * 1993-03-30 1994-10-05 Univ Keele Gas and Vapour Sensor; Smoke Detector
US5629474A (en) * 1993-03-30 1997-05-13 Keele University Production of a sensor for carbon monoxide or water vapor including a semi conductor metallic oxide, catalyst, and rheological agent
EP2752658A4 (en) * 2011-08-29 2015-03-04 Toyota Motor Co Ltd MICROPARTICLE SENSOR AND METHOD FOR MANUFACTURING MICROPARTICLE SENSOR

Also Published As

Publication number Publication date
IE35630L (en) 1972-03-22
IE35630B1 (en) 1976-04-14

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years