GB1470381A - Absorption measurement apparatus for analysing internal com bustion engine exhaust gas - Google Patents

Absorption measurement apparatus for analysing internal com bustion engine exhaust gas

Info

Publication number
GB1470381A
GB1470381A GB1535073A GB1535073A GB1470381A GB 1470381 A GB1470381 A GB 1470381A GB 1535073 A GB1535073 A GB 1535073A GB 1535073 A GB1535073 A GB 1535073A GB 1470381 A GB1470381 A GB 1470381A
Authority
GB
United Kingdom
Prior art keywords
signals
detector
components
filter wheel
exhaust gas
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
Application number
GB1535073A
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.)
Philips Components Ltd
Original Assignee
Mullard Ltd
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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB1535073A priority Critical patent/GB1470381A/en
Priority to DE19742414229 priority patent/DE2414229A1/en
Priority to NL7404028A priority patent/NL7404028A/xx
Priority to IT6798274A priority patent/IT1011642B/en
Priority to FR7411399A priority patent/FR2223691B1/fr
Priority to CA196,397A priority patent/CA1000070A/en
Priority to JP3519774A priority patent/JPS5030580A/ja
Publication of GB1470381A publication Critical patent/GB1470381A/en
Expired legal-status Critical Current

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

Landscapes

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

Abstract

1470381 Infra-red gas analyzer MULLARD Ltd 18 June 1974 [30 March 1973] 15350/73 Heading G1A An infrared gas analyzer is arranged to measure the concentrations of a plurality of components in vehicle exhaust. Infrared radiation having passed through the gas mixture is passed through a rotating filter wheel which has sections passing peak absorption wavelengths characteristic of the various components. The detected radiation signals are stored, compared with a reference level and corrected for any overlapping regions of the absorption characteristics. As shown in Fig. 1, the exhaust gas passes through a cell formed by two concave mirrors, source 1 and detector 10 being at their foci. The filter wheel 9, is formed of a circularly variable continuous interference film but is masked off by mask 15 to allow transmission only through apertures 19 at positions corresponding, to the absorption wavelengths characteristic of the various components, Fig. 2. A projection 16 associated with a photo-electric system provides synchronizing signals for multi-plex de-coder which receives signals from the detector 10 and distributes them to respective integration circuits 35-40, which store the detector outputs corresponding to the different gas components. Integration circuit 41 is reserved for detector signals relating to cut-out 20 of the filter wheel, which characterises none of the gases but is used as a reference. Its output. is fed back to input amplifier 31 where in an automatic gain control circuit it is compared with a reference. The reference provided by 41 is used in amplifiers 42 to standardize the signals on all channels, which signals are then linearized in logarithmic units 47-51 for all but that channel including integrator 38, which does not produce a high enough output to require such correction. Overlapping absorption bands are dealt with by combining the outputs of channels e.g. the H 2 O signal from 51 with the CO 2 signal from 47, in amplifier 60, to obtain accurate concentration representative signals for all components.
GB1535073A 1973-03-30 1973-03-30 Absorption measurement apparatus for analysing internal com bustion engine exhaust gas Expired GB1470381A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB1535073A GB1470381A (en) 1973-03-30 1973-03-30 Absorption measurement apparatus for analysing internal com bustion engine exhaust gas
DE19742414229 DE2414229A1 (en) 1973-03-30 1974-03-25 DEVICE FOR ANALYZING GASEOUS MIXTURES
NL7404028A NL7404028A (en) 1973-03-30 1974-03-26
IT6798274A IT1011642B (en) 1973-03-30 1974-03-27 EQUIPMENT FOR ANALYSIS OF GASEOUS MIXTURES
FR7411399A FR2223691B1 (en) 1973-03-30 1974-03-29
CA196,397A CA1000070A (en) 1973-03-30 1974-03-29 Gaseous mixture analyser using multiple frequency bands
JP3519774A JPS5030580A (en) 1973-03-30 1974-03-30

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1535073A GB1470381A (en) 1973-03-30 1973-03-30 Absorption measurement apparatus for analysing internal com bustion engine exhaust gas

Publications (1)

Publication Number Publication Date
GB1470381A true GB1470381A (en) 1977-04-14

Family

ID=10057587

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1535073A Expired GB1470381A (en) 1973-03-30 1973-03-30 Absorption measurement apparatus for analysing internal com bustion engine exhaust gas

Country Status (7)

Country Link
JP (1) JPS5030580A (en)
CA (1) CA1000070A (en)
DE (1) DE2414229A1 (en)
FR (1) FR2223691B1 (en)
GB (1) GB1470381A (en)
IT (1) IT1011642B (en)
NL (1) NL7404028A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5973326A (en) * 1996-08-10 1999-10-26 Eev Limited Gas monitors
CN102621106A (en) * 2012-03-27 2012-08-01 北京智威宇讯科技有限公司 Multiple optical path reflection cavity
CN102016550B (en) * 2008-02-21 2012-12-19 热费希尔科学公司 Gas analyzer system
WO2014150447A1 (en) * 2013-03-15 2014-09-25 Grove Instruments Inc. Multiplexing and non-multiplexing noninvasive analyte concentration measurement system and methods

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4480191A (en) * 1982-09-27 1984-10-30 Sun Electric Corporation Automatic gain control for an infrared source of an automotive emissions analyzer
AT379452B (en) * 1983-04-21 1986-01-10 Avl Verbrennungskraft Messtech METHOD FOR DETERMINING THE SIZES OF ABSORBENT PROPORTIONS OF A SAMPLE, AND DEVICE FOR IMPLEMENTING THE METHOD
US4549080A (en) * 1983-06-17 1985-10-22 Infrared Industries, Inc. Double-pass flue gas analyzer
FI75675C (en) * 1984-03-23 1988-07-11 Saehkoeliikkeiden Oy A method for determining the hydrocarbon content of liquids containing its α.
EP0404207B1 (en) * 1984-11-13 1995-09-13 Shields Instruments Limited Infrared spectrophotometric method
AT391208B (en) * 1985-12-09 1990-09-10 Avl Verbrennungskraft Messtech METHOD FOR THE QUANTITATIVE MEASUREMENT OF HYDROCARBONS
US5055690A (en) * 1989-02-10 1991-10-08 Gas Research Institute Method of eliminating water vapor interference in detecting gases
US4958076A (en) * 1989-02-10 1990-09-18 Gas Research Institute Selective natural gas detecting apparatus
US4996431A (en) * 1989-02-10 1991-02-26 Gas Research Institute Selective gas detecting apparatus
JPH02144277U (en) * 1989-04-28 1990-12-06
JP3228080B2 (en) * 1995-08-07 2001-11-12 富士電機株式会社 Multiple reflection sample cell
JP7289272B2 (en) * 2019-11-27 2023-06-09 ポリマー キャラクタライゼーション，エセ．アー． Infrared detector and method for measuring component absorbance in samples
WO2023120231A1 (en) * 2021-12-20 2023-06-29 株式会社堀場製作所 Analysis device and analysis method
DE102022204582A1 (en) 2022-05-11 2023-11-16 Robert Bosch Gesellschaft mit beschränkter Haftung Method and device for correctly assigning at least one filter to given light, in particular for use in molecular or medical diagnostics

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5973326A (en) * 1996-08-10 1999-10-26 Eev Limited Gas monitors
CN102016550B (en) * 2008-02-21 2012-12-19 热费希尔科学公司 Gas analyzer system
EP2252877A4 (en) * 2008-02-21 2016-08-31 Thermo Fisher Scientific Inc Gas analyzer system
CN102621106A (en) * 2012-03-27 2012-08-01 北京智威宇讯科技有限公司 Multiple optical path reflection cavity
WO2014150447A1 (en) * 2013-03-15 2014-09-25 Grove Instruments Inc. Multiplexing and non-multiplexing noninvasive analyte concentration measurement system and methods

Also Published As

Publication number Publication date
FR2223691A1 (en) 1974-10-25
FR2223691B1 (en) 1977-10-21
NL7404028A (en) 1974-10-02
CA1000070A (en) 1976-11-23
IT1011642B (en) 1977-02-10
DE2414229A1 (en) 1974-10-10
JPS5030580A (en) 1975-03-26

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee