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1. WO1996009535 - METHOD AND APPARATUS FOR SENSING COMBUSTIBLE GASES EMPLOYING AN OXYGEN-ACTIVATED SENSING ELEMENT

Publication Number WO/1996/009535
Publication Date 28.03.1996
International Application No. PCT/US1995/012055
International Filing Date 21.09.1995
IPC
G01N 27/00 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
G01N 27/12 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
02by investigating impedance
04by investigating resistance
12of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid
CPC
G01N 27/002
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
002by investigating the work function voltage
G01N 27/12
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
02by investigating impedance
04by investigating resistance
12of 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
Y10T 436/207497
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
436Chemistry: analytical and immunological testing
20Oxygen containing
207497Molecular oxygen
Y10T 436/208339
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
436Chemistry: analytical and immunological testing
20Oxygen containing
207497Molecular oxygen
208339Fuel/air mixture or exhaust gas analysis
Applicants
  • ARIZONA BOARD OF REGENTS [US]/[US]
Inventors
  • GLAUNSINGER, William
  • SORENSEN, Ian
  • CHELVAYOHAN, Mahesan
Agents
  • GREENE, Donald, R.
Priority Data
08/311,10123.09.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND APPARATUS FOR SENSING COMBUSTIBLE GASES EMPLOYING AN OXYGEN-ACTIVATED SENSING ELEMENT
(FR) PROCEDE ET APPAREIL DE DETECTION DE GAZ COMBUSTIBLES UTILISANT UN ELEMENT DE DETECTION ACTIVE PAR L'OXYGENE
Abstract
(EN)
A combustible gas sensor (50) having a noble metal sensor element with a surface that is heated above its critical temperature at which the surface dissociates oxygen from a passing gas stream and adsorbs the dissociated oxygen onto its surface, thus enhancing the reactivity of the sensor element to combustible gases that would otherwise have little or no affinity for the particular sensor element. The adsorption of the oxygen and combustible gas on the sensor surface causes a change in an electrical property that is measured to determine the presence, identity or concentration of combustible gas in the passing gas stream, for example by incorporating the sensor element as a component of a variable capacitor contained in an electrical circuit (20).
(FR)
Détecteur (50) de gaz combustible comportant un élément de détection en métal précieux dont la surface est chauffée à une température supérieure à la température critique à laquelle la surface dissocie l'oxygène d'un courant de gaz en circulation et adsorbe l'oxygène dissocié sur sa surface, ce qui a pour effet d'augmenter la réactivité de l'élément de détection par rapport aux gaz combustibles qui, sans cela, ne présenteraient qu'une affinité faible ou nulle avec cet élément de détection particulier. L'adsorption de l'oxygène et du gaz combustible à la surface du détecteur provoque une modification d'une caractéristique électrique qui est mesurée pour déterminer la présence, l'identité, ou la concentration de gaz combustible dans le courant de gaz, par exemple par introduction de l'élément de détection comme composant d'un condensateur variable placé dans un circuit électrique (20).
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