WO2008029171A3 - Gas detector - Google Patents

Gas detector Download PDF

Info

Publication number
WO2008029171A3
WO2008029171A3 PCT/GB2007/003407 GB2007003407W WO2008029171A3 WO 2008029171 A3 WO2008029171 A3 WO 2008029171A3 GB 2007003407 W GB2007003407 W GB 2007003407W WO 2008029171 A3 WO2008029171 A3 WO 2008029171A3
Authority
WO
WIPO (PCT)
Prior art keywords
radiation
detector
gas detector
sources
frequency
Prior art date
Application number
PCT/GB2007/003407
Other languages
French (fr)
Other versions
WO2008029171A2 (en
Inventor
Paul John Basham
Original Assignee
Crowcon Detection Instr Ltd
Paul John Basham
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 Crowcon Detection Instr Ltd, Paul John Basham filed Critical Crowcon Detection Instr Ltd
Priority to EP07804205A priority Critical patent/EP2062028A2/en
Priority to US12/440,261 priority patent/US20100078560A1/en
Publication of WO2008029171A2 publication Critical patent/WO2008029171A2/en
Publication of WO2008029171A3 publication Critical patent/WO2008029171A3/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
    • G01N21/3151—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths using two sources of radiation of different wavelengths
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Toxicology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

A gas detector (10) comprising a first radiation source (12) for emitting radiation at a first frequency, a second radiation source (14) for emitting radiation at a second frequency, a radiation detector (18) adapted simultaneously to detect temporally overlapping radiation from both the first and second radiation sources which in use pass through a sample region (16) located between the first and second radiation sources (12, 14) and the detector (18), and further, comprising a processor (20) enabling comparison of the radiation detected by the detector (18) from the first and second radiation sources (12, 14) thereby to determine the level of a pre-determined gas in the sample region.
PCT/GB2007/003407 2006-09-08 2007-09-10 Gas detector WO2008029171A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07804205A EP2062028A2 (en) 2006-09-08 2007-09-10 Gas detector
US12/440,261 US20100078560A1 (en) 2006-09-08 2007-09-10 Gas detector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0617719.0A GB0617719D0 (en) 2006-09-08 2006-09-08 Gas detector
GB0617719.0 2006-09-08

Publications (2)

Publication Number Publication Date
WO2008029171A2 WO2008029171A2 (en) 2008-03-13
WO2008029171A3 true WO2008029171A3 (en) 2008-05-02

Family

ID=37232617

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/003407 WO2008029171A2 (en) 2006-09-08 2007-09-10 Gas detector

Country Status (5)

Country Link
US (1) US20100078560A1 (en)
EP (1) EP2062028A2 (en)
CN (1) CN101583861A (en)
GB (2) GB0617719D0 (en)
WO (1) WO2008029171A2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8785857B2 (en) 2011-09-23 2014-07-22 Msa Technology, Llc Infrared sensor with multiple sources for gas measurement
JP6054715B2 (en) * 2012-11-20 2016-12-27 日本電子株式会社 Mass spectrometer and control method of mass spectrometer
GB201513313D0 (en) * 2015-07-28 2015-09-09 Gas Measurement Instr Ltd Gas detection apparatus and method
US9612195B1 (en) 2015-11-11 2017-04-04 Bert Friedman Gas detector and method for monitoring gas in a confined space
US10422740B2 (en) 2016-04-21 2019-09-24 Honeywell International Inc. Dual wavelength source gas detector
AU2018310450A1 (en) * 2017-08-01 2020-01-30 Zoetis Services Llc Apparatus for analyzing a media, and associated egg identification apparatus and method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4586026A (en) * 1983-11-07 1986-04-29 Liston Edwards, Inc. Infrared gas analyzer using count quadrature sampling
EP0502717A1 (en) * 1991-03-05 1992-09-09 SensorMedics Corporation Photoplethysmographics using phase-division multiplexing
US5800348A (en) * 1995-08-31 1998-09-01 Hewlett-Packard Company Apparatus and method for medical monitoring, in particular pulse oximeter
WO2001044781A2 (en) * 1999-12-17 2001-06-21 Datex-Ohmeda, Inc. Oversampling pulse oximeter
WO2001044780A2 (en) * 1999-12-17 2001-06-21 Datex-Ohmeda, Inc. Synchronized modulation/demodulation method and apparatus for frequency division multiplexed spectrophotometric system
US6370408B1 (en) * 1993-12-17 2002-04-09 Mallinckrodt, Inc. Medical sensor with amplitude independent output
WO2005088275A1 (en) * 2004-03-09 2005-09-22 Senscient Limited Gas detection

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5774213A (en) * 1995-04-21 1998-06-30 Trebino; Rick P. Techniques for measuring difference of an optical property at two wavelengths by modulating two sources to have opposite-phase components at a common frequency
EP0760223A1 (en) * 1995-08-31 1997-03-05 Hewlett-Packard GmbH Apparatus for monitoring, in particular pulse oximeter
US5995858A (en) * 1997-11-07 1999-11-30 Datascope Investment Corp. Pulse oximeter
DE19911260A1 (en) * 1999-03-13 2000-09-14 Leybold Vakuum Gmbh Infrared gas analyzer and method for operating this analyzer
WO2003041248A2 (en) * 2001-11-05 2003-05-15 Siemens Ag Österreich Voltage converter
US20080008625A1 (en) * 2004-10-27 2008-01-10 Thomas Ross C Infrared sensor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4586026A (en) * 1983-11-07 1986-04-29 Liston Edwards, Inc. Infrared gas analyzer using count quadrature sampling
EP0502717A1 (en) * 1991-03-05 1992-09-09 SensorMedics Corporation Photoplethysmographics using phase-division multiplexing
US6370408B1 (en) * 1993-12-17 2002-04-09 Mallinckrodt, Inc. Medical sensor with amplitude independent output
US5800348A (en) * 1995-08-31 1998-09-01 Hewlett-Packard Company Apparatus and method for medical monitoring, in particular pulse oximeter
WO2001044781A2 (en) * 1999-12-17 2001-06-21 Datex-Ohmeda, Inc. Oversampling pulse oximeter
WO2001044780A2 (en) * 1999-12-17 2001-06-21 Datex-Ohmeda, Inc. Synchronized modulation/demodulation method and apparatus for frequency division multiplexed spectrophotometric system
WO2005088275A1 (en) * 2004-03-09 2005-09-22 Senscient Limited Gas detection

Also Published As

Publication number Publication date
US20100078560A1 (en) 2010-04-01
EP2062028A2 (en) 2009-05-27
GB0717608D0 (en) 2007-10-17
CN101583861A (en) 2009-11-18
GB0617719D0 (en) 2006-10-18
GB2442101A (en) 2008-03-26
WO2008029171A2 (en) 2008-03-13

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