WO2012166585A3 - Re-calibration of ab ndir gas sensors - Google Patents

Re-calibration of ab ndir gas sensors Download PDF

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Publication number
WO2012166585A3
WO2012166585A3 PCT/US2012/039539 US2012039539W WO2012166585A3 WO 2012166585 A3 WO2012166585 A3 WO 2012166585A3 US 2012039539 W US2012039539 W US 2012039539W WO 2012166585 A3 WO2012166585 A3 WO 2012166585A3
Authority
WO
WIPO (PCT)
Prior art keywords
ndir gas
signal channel
gas sensor
pathlength
channel
Prior art date
Application number
PCT/US2012/039539
Other languages
French (fr)
Other versions
WO2012166585A2 (en
Inventor
Jacob Y. Wong
Original Assignee
Airware, Inc.
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 US13/149,738 external-priority patent/US8178832B1/en
Priority claimed from US13/348,568 external-priority patent/US8222606B1/en
Priority claimed from US13/420,323 external-priority patent/US8217355B1/en
Application filed by Airware, Inc. filed Critical Airware, Inc.
Priority to AU2012262488A priority Critical patent/AU2012262488A1/en
Priority to CA2837588A priority patent/CA2837588A1/en
Priority to EP12794011.2A priority patent/EP2715291A4/en
Publication of WO2012166585A2 publication Critical patent/WO2012166585A2/en
Publication of WO2012166585A3 publication Critical patent/WO2012166585A3/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • 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
    • G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
    • G01N21/274—Calibration, base line adjustment, drift correction
    • 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
    • G01N21/59—Transmissivity
    • G01N21/61—Non-dispersive gas analysers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/066—Modifiable path; multiple paths in one sample
    • G01N2201/0662—Comparing measurements on two or more paths in one sample
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/12—Circuits of general importance; Signal processing
    • G01N2201/127—Calibration; base line adjustment; drift compensation
    • G01N2201/12746—Calibration values determination

Landscapes

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

Abstract

Absorption-biased NDIR gas sensors can be recalibrated by adjusting a calibration curve obtained from a gamma ratio ("G") that has been normalized by the gamma ratio when no sample gas is present in the sample chamber (*Go"), G being the ratio of a signal channel output ("Vs") of the NDIR gas sensor divided by a reference channel output ("VR") of the NDIR gas sensor. An AB NDIR gas sensor uses an identical spectral narrow band pass filter for wavelength selection for both a signal channel having a signal channel pathlength and a reference channel having a reference channel pathlength and an absorption bias is applied to the signal channel by making the signal channel path length longer than the reference channel pathlength. Recalibration can be achieved by adjusting Go based upon a reversed calibration curve algorithm that uses a concentration of sample gas determined by a master NDIR gas sensor.
PCT/US2012/039539 2011-05-31 2012-05-25 Re-calibration of ab ndir gas sensors WO2012166585A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2012262488A AU2012262488A1 (en) 2011-05-31 2012-05-25 Re-calibration of AB NDIR gas sensors
CA2837588A CA2837588A1 (en) 2011-05-31 2012-05-25 Re-calibration of ab ndir gas sensors
EP12794011.2A EP2715291A4 (en) 2011-05-31 2012-05-25 Re-calibration of ab ndir gas sensors

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US13/149,738 2011-05-31
US13/149,738 US8178832B1 (en) 2011-05-31 2011-05-31 Re-calibration methodology for NDIR gas sensors
US13/348,568 US8222606B1 (en) 2011-05-31 2012-01-11 Air sampler for recalibration of absorption biased designed NDIR gas sensors
US13/348,568 2012-01-11
US13/420,323 US8217355B1 (en) 2011-05-31 2012-03-14 Self-commissioning NDIR gas sensors
US13/420,323 2012-03-14

Publications (2)

Publication Number Publication Date
WO2012166585A2 WO2012166585A2 (en) 2012-12-06
WO2012166585A3 true WO2012166585A3 (en) 2014-05-08

Family

ID=47260211

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2012/039539 WO2012166585A2 (en) 2011-05-31 2012-05-25 Re-calibration of ab ndir gas sensors

Country Status (4)

Country Link
EP (1) EP2715291A4 (en)
AU (1) AU2012262488A1 (en)
CA (1) CA2837588A1 (en)
WO (1) WO2012166585A2 (en)

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DE102015106632A1 (en) * 2015-04-29 2016-11-03 Smartgas Mikrosensorik Gmbh Sensor for detecting the concentration of at least one medium and method for operating such a sensor
IT201900006920A1 (en) * 2019-05-16 2020-11-16 Ft System Srl Method and apparatus for recognizing the presence of leaks from sealed containers
SE544494C2 (en) 2020-10-21 2022-06-21 Senseair Ab Temperature controller for a temperature control mechanism
SE544539C2 (en) * 2020-11-18 2022-07-05 Senseair Ab Method and device for determining a concentration of a component in a fluid
EP4363831A1 (en) * 2021-07-01 2024-05-08 Boehringer Ingelheim Vetmedica GmbH Method for calibrating an optical system
CN117470795B (en) * 2023-12-27 2024-03-29 成都千嘉科技股份有限公司 Non-spectroscopic infrared gas sensor and gas testing method thereof

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Also Published As

Publication number Publication date
AU2012262488A1 (en) 2014-01-16
EP2715291A2 (en) 2014-04-09
CA2837588A1 (en) 2012-12-06
EP2715291A4 (en) 2015-10-21
WO2012166585A2 (en) 2012-12-06

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