GB1401942A - Method and system for the infrared analysis of gases - Google Patents
Method and system for the infrared analysis of gasesInfo
- Publication number
- GB1401942A GB1401942A GB1268573A GB1268573A GB1401942A GB 1401942 A GB1401942 A GB 1401942A GB 1268573 A GB1268573 A GB 1268573A GB 1268573 A GB1268573 A GB 1268573A GB 1401942 A GB1401942 A GB 1401942A
- Authority
- GB
- United Kingdom
- Prior art keywords
- background
- compensated
- components
- component
- signal
- 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.)
- Expired
Links
- 239000007789 gas Substances 0.000 title 1
- 239000000203 mixture Substances 0.000 abstract 4
- 230000005855 radiation Effects 0.000 abstract 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract 1
- 239000001569 carbon dioxide Substances 0.000 abstract 1
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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Engineering & Computer Science (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
1401942 Measuring components present in a gas CHRYSLER CORP 16 March 1973 12685/73 Heading G1A In a spectrophotometer for measuring the amounts of a number of components (e.g. carbon dioxide, water vapour, &c.) present in a gas mixture (e.g. automobile exhaust), infrared radiation passing through a sample cell 15, through which the gas mixture flows, is received by a detector 30 after it has passed through a one of a number of filters 72, or 73, including a reference filter and filters sensitive to the components of interest, on a rotating disc 71 which also contains an opaque portion designed to cut off the radiation from the source 12 so that the detector substantially only receives the background radiation. The detector's output signals corresponding to the background reference and components are stored sequential by sample and hold circuits controlled by sychronizing means such as provided by small holes in the periphery of the disc Figs.9-13 (not shown), passing between an elongated source and a plurality of detectors, Fig.13. The stored signals are then processed by compensating the reference and component signals for background radition and then dividing each background compensated component signal by the background compensated reference signal to produce a ratio signal, for each component being investigated, representative of the amount present in the gas mixture. The description discloses processing circuits Figs. 15-19 (not shown), for the detector output signals and discusses at length the mathematics behind the signal processing and the errors involved. In one processing circuit, Fig.17 (not shown), each component signal after being compensated for background radiation and "divided" by the reference signal is compensated for any interference or error due to water vapour components present in the gas mixture. This extra compensation is further developed, Figs.17 and 18 (not shown), in further circuits where each component is compensated for the effects of interference from all the other components present in the gas. The description discloses ways of calibrating the circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1268573A GB1401942A (en) | 1973-03-16 | 1973-03-16 | Method and system for the infrared analysis of gases |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1268573A GB1401942A (en) | 1973-03-16 | 1973-03-16 | Method and system for the infrared analysis of gases |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1401942A true GB1401942A (en) | 1975-08-06 |
Family
ID=10009260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1268573A Expired GB1401942A (en) | 1973-03-16 | 1973-03-16 | Method and system for the infrared analysis of gases |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1401942A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0091692A3 (en) * | 1982-04-14 | 1984-09-05 | Kozponti Elelmiszeripari Kutato Intezet | Method and apparatus for measuring spectra of materials |
| EP0158506A3 (en) * | 1984-04-09 | 1987-04-01 | Eastman Kodak Company | Method and apparatus for determination of an analyte and method of calibrating such apparatus |
| EP1408325A3 (en) * | 2002-09-13 | 2004-08-18 | Delphi Technologies, Inc. | Method of measuring exhaust flow constituents |
| DE102011111836A1 (en) * | 2011-08-27 | 2013-02-28 | Inficon Gmbh | Apparatus and method for refrigerant identification |
| CN110068542A (en) * | 2019-06-03 | 2019-07-30 | 宁波舜宇红外技术有限公司 | Detect the device of target gas levels in mixed gas |
| CN114414506A (en) * | 2021-11-29 | 2022-04-29 | 重庆川仪自动化股份有限公司 | A Calibrated Absorbance Measurement Circuit |
| CN115371823A (en) * | 2022-10-24 | 2022-11-22 | 南京智谱科技有限公司 | Real-time calibration method of multi-spectral-band infrared camera core system based on double-temperature-control blocking sheet |
-
1973
- 1973-03-16 GB GB1268573A patent/GB1401942A/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0091692A3 (en) * | 1982-04-14 | 1984-09-05 | Kozponti Elelmiszeripari Kutato Intezet | Method and apparatus for measuring spectra of materials |
| EP0158506A3 (en) * | 1984-04-09 | 1987-04-01 | Eastman Kodak Company | Method and apparatus for determination of an analyte and method of calibrating such apparatus |
| EP1408325A3 (en) * | 2002-09-13 | 2004-08-18 | Delphi Technologies, Inc. | Method of measuring exhaust flow constituents |
| DE102011111836A1 (en) * | 2011-08-27 | 2013-02-28 | Inficon Gmbh | Apparatus and method for refrigerant identification |
| US10031075B2 (en) | 2011-08-27 | 2018-07-24 | Inficon Gmbh | Device and method for identifying refrigerants |
| CN110068542A (en) * | 2019-06-03 | 2019-07-30 | 宁波舜宇红外技术有限公司 | Detect the device of target gas levels in mixed gas |
| CN114414506A (en) * | 2021-11-29 | 2022-04-29 | 重庆川仪自动化股份有限公司 | A Calibrated Absorbance Measurement Circuit |
| CN115371823A (en) * | 2022-10-24 | 2022-11-22 | 南京智谱科技有限公司 | Real-time calibration method of multi-spectral-band infrared camera core system based on double-temperature-control blocking sheet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |