GB2198845A - Sensing - Google Patents

Sensing Download PDF

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Publication number
GB2198845A
GB2198845A GB08716543A GB8716543A GB2198845A GB 2198845 A GB2198845 A GB 2198845A GB 08716543 A GB08716543 A GB 08716543A GB 8716543 A GB8716543 A GB 8716543A GB 2198845 A GB2198845 A GB 2198845A
Authority
GB
United Kingdom
Prior art keywords
gas
temperature change
catalysing
sensing
produced
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.)
Withdrawn
Application number
GB08716543A
Other versions
GB8716543D0 (en
Inventor
Dr David Edward Williams
Dr John Oliver Wilson Norris
Dr Patrick Timothy Moseley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
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 by UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Publication of GB8716543D0 publication Critical patent/GB8716543D0/en
Publication of GB2198845A publication Critical patent/GB2198845A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
    • G01N31/10—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using catalysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
    • G01N25/22—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Combustion & Propulsion (AREA)
  • Engineering & Computer Science (AREA)
  • Molecular Biology (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

The present invention relates to sensing and more particularly to sensing finding application in the detection of gases. The invention provides a method for the detection of a gas which includes contacting the gas with a surface which surface has a region coated with a material which is capable of catalysing a reaction involving the gas when the gas is in the presence of the material such that a temperature change is produced, and sensing the temperature change. The gas may be, for example, a combustible gas such as H2, CO or H2S. The material may be, for example, one capable of catalysing combustion of a combustible gas. By way of example a thermal imaging camera may be used to sense the temperature range.

Description

Sensing The present invention relates to sensing and more particularly to sensing finding application in the detection of gases (e.g. combustible gases).
According to the present invention there is provided a method for the detection of a gas which includes contacting the gas with a surface said surface having a region coated with a material which is capable of catalysing a reaction involving the gas when the gas is in the presence of the material such that a temperature change is produced, and sensing the temperature change.
In accordance with one embodiment of the present invention there is provided a method for the detection of a combustible gas which includes contacting the gas with a surface said surface having a region coated with a material which is capable of catalysing combustion of the combustible gas when the combustible gas is in the presence of the material such that a temperature change is produced, and measuring the temperature change.
In the circumstances where the material catalyses the combustion of a combustible gas, the temperature change will generally be a temperature rise.
Temperature change produced in accordance with the present invention may be detected by any suitable means.
For example, a thermal imaging camera may be used to sense the temperature change produced by the catalysed reaction.
A method in accordance with the present invention may be used to detect a selected gas at low concentration, for example, at low concentration in air.
Examples of gases which may be detected in air by a method in accordance with the present invention are hydrogen, carbon monoxide and hydrogen sulphide.
Examples of materials capable of catalysing the combustion of gases are precious metal catalysts such as platinum and palladium and mixtures thereof.
The material may include a support for the catalyst e.g. tin oxide - and the catalyst may be finely divided.
It will be understood that the surface may be scanned by a thermal imaging camera and a change in temperature occuring as a result of the catalysed reaction may thereby LG sensed.
A thermal imagine camera may be used in accordance with one embodiment of the invention to scan an array of surfaces treated with regions of material capable of catalysing a reaction involving a gas.

Claims (7)

Claims
1. A method for the detection of a gas which includes contacting the gas with a surface said surface having a region coated with a material which is capable of catalysing a reaction involving the gas when the gas is in the presence of the material such that a temperature change is produced, and sensing the temperature change.
2. A method as claimed in Claim 1 wherein the gas to be detected is a combustible gas said method including contacting the gas with a surface said surface having a region coated with a material which is capable of catalysing combustion of the combustible gas when the combustible gas is in the presence of the material such that a temperature change is produced, and measuring the temperature- change.
3. A method as claimed in Claim 1 or Claim 2 wherein the temperature change produced is sensed by use of a thermal imaging camera.
4. A method as claimed in any one of the preceding Claims wherein hydrogen, carbon monoxide or hydrogen sulphide is detected in air.
5. A method as claimed in any one of the preceding Claims wherein the material capable of catalysing a reaction involving a gas comprises a precious metal catalyst.
6. A method as claimed in Claim 5 wherein the catalyst is platinum or palladium or a mixture of platinum or palladium.
7. A method as claimed in any one of the preceding Claims wherein the material capable of catalysing a reaction includes a support for a catalyst.
GB08716543A 1986-07-17 1987-07-14 Sensing Withdrawn GB2198845A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB868617429A GB8617429D0 (en) 1986-07-17 1986-07-17 Sensing

Publications (2)

Publication Number Publication Date
GB8716543D0 GB8716543D0 (en) 1987-08-19
GB2198845A true GB2198845A (en) 1988-06-22

Family

ID=10601204

Family Applications (2)

Application Number Title Priority Date Filing Date
GB868617429A Pending GB8617429D0 (en) 1986-07-17 1986-07-17 Sensing
GB08716543A Withdrawn GB2198845A (en) 1986-07-17 1987-07-14 Sensing

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB868617429A Pending GB8617429D0 (en) 1986-07-17 1986-07-17 Sensing

Country Status (1)

Country Link
GB (2) GB8617429D0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003023386A1 (en) * 2001-09-05 2003-03-20 Hte Aktiengesellschaft The High Throughput Experimentation Company Method and device for the analysis of a fluid medium

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1201503A (en) * 1966-11-05 1970-08-05 Gas Detector S P A Method and apparatus for detecting the presence of dangerous concentrations of combustible gases and vapors in the air
US3861879A (en) * 1974-01-02 1975-01-21 Minnesota Mining & Mfg Pyroelectric gas dosimeter
US3888630A (en) * 1973-12-26 1975-06-10 Borg Warner Breath testing method
GB2015175A (en) * 1977-11-24 1979-09-05 Johnson Matthey Co Ltd Detector for Combustible Gases
GB2091882A (en) * 1981-01-26 1982-08-04 Nat Res Dev Electrical catalytic gas detection systems
GB2167192A (en) * 1984-11-15 1986-05-21 Atomic Energy Authority Uk Gas sensor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1201503A (en) * 1966-11-05 1970-08-05 Gas Detector S P A Method and apparatus for detecting the presence of dangerous concentrations of combustible gases and vapors in the air
US3888630A (en) * 1973-12-26 1975-06-10 Borg Warner Breath testing method
US3861879A (en) * 1974-01-02 1975-01-21 Minnesota Mining & Mfg Pyroelectric gas dosimeter
GB2015175A (en) * 1977-11-24 1979-09-05 Johnson Matthey Co Ltd Detector for Combustible Gases
GB2091882A (en) * 1981-01-26 1982-08-04 Nat Res Dev Electrical catalytic gas detection systems
GB2167192A (en) * 1984-11-15 1986-05-21 Atomic Energy Authority Uk Gas sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003023386A1 (en) * 2001-09-05 2003-03-20 Hte Aktiengesellschaft The High Throughput Experimentation Company Method and device for the analysis of a fluid medium

Also Published As

Publication number Publication date
GB8617429D0 (en) 1986-08-28
GB8716543D0 (en) 1987-08-19

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)