WO2007064370A3 - Ultra low cost ndir gas sensors - Google Patents

Ultra low cost ndir gas sensors Download PDF

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Publication number
WO2007064370A3
WO2007064370A3 PCT/US2006/030440 US2006030440W WO2007064370A3 WO 2007064370 A3 WO2007064370 A3 WO 2007064370A3 US 2006030440 W US2006030440 W US 2006030440W WO 2007064370 A3 WO2007064370 A3 WO 2007064370A3
Authority
WO
WIPO (PCT)
Prior art keywords
cycle
source
temperature
driving
low cycle
Prior art date
Application number
PCT/US2006/030440
Other languages
French (fr)
Other versions
WO2007064370A2 (en
Inventor
Jacob Y Wong
Chi Wai Tse
Original Assignee
Airware Inc
Jacob Y Wong
Chi Wai Tse
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
Priority claimed from US11/197,790 external-priority patent/US7358489B2/en
Priority claimed from US11/198,106 external-priority patent/US7329870B2/en
Application filed by Airware Inc, Jacob Y Wong, Chi Wai Tse filed Critical Airware Inc
Publication of WO2007064370A2 publication Critical patent/WO2007064370A2/en
Publication of WO2007064370A3 publication Critical patent/WO2007064370A3/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
    • G01N21/35—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
    • 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
    • G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
    • 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
    • G01N21/59—Transmissivity
    • G01N21/61—Non-dispersive gas analysers

Abstract

The concentration of a single gas species can be detected using a single beam NDIR gas sensor having a differential infrared source element producing radiation having a first spectrum at a first high temperature and a second spectrum at a second lower temperature, a detector and a dual pass band filter. The gas sensor further includes a driver driving the source at either the fjrst or second temperatures; a feed back loop; a differential gain amplifier creating a high cycle amplified output during a high cycle and a low cycle amplified output during a low cycle; a controller for synchronizing the driver and driving the source at the first temperature and applying high cycle amplification during the high cycle and driving the source at the second temperature and applying a low cycle amplification during the low cycle; and a signal processor for determining the concentration of he gas species.
PCT/US2006/030440 2005-08-04 2006-08-03 Ultra low cost ndir gas sensors WO2007064370A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US11/197,790 US7358489B2 (en) 2005-08-04 2005-08-04 Ultra low cost NDIR gas sensors
US11/197,790 2005-08-04
US11/198,106 US7329870B2 (en) 2005-08-05 2005-08-05 Simple multi-channel NDIR gas sensors
US11/198,106 2005-08-05

Publications (2)

Publication Number Publication Date
WO2007064370A2 WO2007064370A2 (en) 2007-06-07
WO2007064370A3 true WO2007064370A3 (en) 2007-11-15

Family

ID=38092682

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/030440 WO2007064370A2 (en) 2005-08-04 2006-08-03 Ultra low cost ndir gas sensors

Country Status (1)

Country Link
WO (1) WO2007064370A2 (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7329870B2 (en) * 2005-08-05 2008-02-12 Airware, Inc. Simple multi-channel NDIR gas sensors
WO2014105071A1 (en) 2012-12-28 2014-07-03 Halliburton Energy Services, Inc. Pulse width modulation of continuum sources for determination of chemical composition
US8917183B2 (en) * 2013-03-12 2014-12-23 Airware, Inc Methane and water vapor gas sensors integrated into a personal miner's alarm
FR3055703B1 (en) * 2016-09-05 2020-12-18 Elichens GAS ANALYSIS PROCESS
FR3062912A1 (en) 2017-02-14 2018-08-17 Elichens METHOD OF ESTIMATING THE INTENSITY OF A WAVE EMITTED BY A TRANSMITTING SOURCE
FR3063811B1 (en) 2017-03-10 2021-08-27 Elichens OPTICAL GAS SENSOR
FR3066023B1 (en) 2017-05-04 2019-06-28 Elichens DEVICE AND METHOD FOR MEASURING AND MONITORING THE QUANTITY OR CONCENTRATION OF A COMPONENT IN A FLUID
FR3067813B1 (en) 2017-06-15 2021-05-14 Elichens METHOD OF ESTIMATING A QUANTITY OF A GASEOUS SPECIES
FR3072775B1 (en) 2017-10-23 2019-09-27 Elichens COMPACT GAS SENSOR
FR3077387B1 (en) * 2018-01-29 2020-01-17 Elichens METHOD FOR ESTIMATING A QUANTITY OF GAS
FR3077640B1 (en) * 2018-02-05 2023-06-30 Elichens METHOD FOR ANALYZING A GAS BY DOUBLE ILLUMINATION
CN108801967B (en) * 2018-06-21 2021-06-15 长春理工大学 Double-passband filter device, infrared thermal imaging detection system and method for detecting methane
FR3089009B1 (en) 2018-11-27 2020-12-04 Elichens Gas sensor incorporating a pulsed light source
FR3095517B1 (en) 2019-04-25 2021-05-14 Elichens Compact gas sensor
FR3096461B1 (en) 2019-05-23 2021-10-29 Elichens Device for emitting and controlling infrared light and gas sensor using such a device
FR3099828A1 (en) 2019-08-06 2021-02-12 Elichens Method for analyzing a gas by an optical sensor
FR3115104B1 (en) 2020-10-10 2022-09-30 Elichens Gas sensor optimized light emitting device and method of manufacture
FR3119021B1 (en) 2021-01-21 2023-02-10 Elichens Method for calibrating a gas sensor and method for measuring a gas implementing the calibration
FR3121751A1 (en) 2021-04-13 2022-10-14 Elichens Gas sensor calibration process
FR3124264B1 (en) 2021-06-22 2023-06-30 Elichens Method for estimating a concentration of a gaseous species from a signal emitted by a gas sensor.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5026992A (en) * 1989-09-06 1991-06-25 Gaztech Corporation Spectral ratioing technique for NDIR gas analysis using a differential temperature source
US5608219A (en) * 1993-11-12 1997-03-04 Saphir Device for detecting gas by infrared absorption
US5834777A (en) * 1994-02-14 1998-11-10 Telaire Systems, Inc. NDIR gas sensor
US6825471B1 (en) * 1999-03-08 2004-11-30 Gasbeetle Gas detector and method of operating a gas detector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5026992A (en) * 1989-09-06 1991-06-25 Gaztech Corporation Spectral ratioing technique for NDIR gas analysis using a differential temperature source
US5608219A (en) * 1993-11-12 1997-03-04 Saphir Device for detecting gas by infrared absorption
US5834777A (en) * 1994-02-14 1998-11-10 Telaire Systems, Inc. NDIR gas sensor
US6825471B1 (en) * 1999-03-08 2004-11-30 Gasbeetle Gas detector and method of operating a gas detector

Also Published As

Publication number Publication date
WO2007064370A2 (en) 2007-06-07

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