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GB2016142A - Apparatus for detecting the presence of a specific substance in a gas stream - Google Patents

Apparatus for detecting the presence of a specific substance in a gas stream

Info

Publication number
GB2016142A
GB2016142A GB7907845A GB7907845A GB2016142A GB 2016142 A GB2016142 A GB 2016142A GB 7907845 A GB7907845 A GB 7907845A GB 7907845 A GB7907845 A GB 7907845A GB 2016142 A GB2016142 A GB 2016142A
Authority
GB
United Kingdom
Prior art keywords
chamber
test paper
specific substance
light beam
amplifier
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.)
Granted
Application number
GB7907845A
Other versions
GB2016142B (en
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.)
Noranda Inc
Original Assignee
Noranda 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
Application filed by Noranda Inc filed Critical Noranda Inc
Publication of GB2016142A publication Critical patent/GB2016142A/en
Application granted granted Critical
Publication of GB2016142B publication Critical patent/GB2016142B/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
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/8483—Investigating reagent band

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (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 The Use Of Chemical Reactions (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

Apparatus for detecting the presence of a specific substance in a gas stream comprises a sensing chamber (10) receiving a test paper (16) which is subject to colouration when contacted by a specific substance in a gas in the chamber (10), means (24,26,28,30,32, 34) generating a light beam and directing it toward the test paper (16) in the chamber (10), a light beam sensing device (42) responsive to the extent to which the test paper in the chamber undergoes colouration in response to exposure to the specific substance, an amplifier (48) connected to the device (42) and providing an output voltage proportional to the colouration of the test paper, and differentiator (56) and non-linearity compensation means (60) connected to the amplifier (48) for providing an output signal which is an instantaneous indication of the concentration of the specific substance. A beam splitter (34) divides the light beam into two separate beams, one directed toward the test paper (16) in the chamber (10) and the other toward a variable optical density filter (36). A second light beam sensing device (46) is responsive to the transmittance of the filter (36). The amplifier (48) is responsive to the two light beam sensing devices (42, 46) for providing an output which is a function of the ratio of the light sensed by the devices (42, 46) irrespective of light source intensity variations. Before each measurement, zeroing is performed via reset amplifier 50 controlling the position of filter 36. <IMAGE>
GB7907845A 1978-03-07 1979-03-06 Apparatus for detecting the presence of a specific substance in a gas stream Expired GB2016142B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA298,415A CA1085647A (en) 1978-03-07 1978-03-07 Apparatus for detecting the presence of a specific substance in a gas stream

Publications (2)

Publication Number Publication Date
GB2016142A true GB2016142A (en) 1979-09-19
GB2016142B GB2016142B (en) 1982-07-07

Family

ID=4110933

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7907845A Expired GB2016142B (en) 1978-03-07 1979-03-06 Apparatus for detecting the presence of a specific substance in a gas stream

Country Status (7)

Country Link
JP (1) JPS5912132B2 (en)
BE (1) BE874449A (en)
CA (1) CA1085647A (en)
DE (1) DE2903017C2 (en)
FI (1) FI69930C (en)
FR (1) FR2419517A1 (en)
GB (1) GB2016142B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0241666A3 (en) * 1986-02-18 1988-04-20 Dragerwerk Aktiengesellschaft Gas meter and warning device
CN106248595A (en) * 2016-08-04 2016-12-21 西安热工研究院有限公司 Bivalent mercury and the test system and method for nonvalent mercury in a kind of coal-fired plant flue gas

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT391759B (en) * 1988-05-27 1990-11-26 Wolfbeis Otto S Method and device for the determination of solvent vapours
DE4021556A1 (en) * 1990-07-06 1992-01-09 Draegerwerk Ag Concn. measuring arrangement for gaseous and/or vapour components - uses substance causing colour reaction in test tube, opto-electronic and/or visual detection
US5297421A (en) * 1991-03-05 1994-03-29 Mitsui Toatsu Chemicals, Inc. Leak detection system for gas, steam or the like that involves multi-point sampling
DE4303858C2 (en) * 1993-02-10 1995-08-31 Draegerwerk Ag Device for the colorimetric detection of gaseous and / or vaporous components of a gas mixture due to the discoloration of a reaction zone arranged in a channel

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2768370A (en) * 1952-10-30 1956-10-23 Vitro Corp Of America Continuous automatic gas analyzer
DE1055849B (en) * 1957-12-20 1959-04-23 Maihak Ag Device and method for the continuous determination of a component in gas mixtures
NL7106648A (en) * 1970-05-18 1971-11-22 Kyoto Daiichi Kagaku Kk
DE2219552A1 (en) * 1972-04-21 1973-11-08 Bodenseewerk Perkin Elmer Co PHOTOMETRIC ANALYSIS PROCEDURE
DE2407224C3 (en) * 1974-02-15 1980-01-10 H. Maihak Ag, 2000 Hamburg Device for determining a component in a gas mixture

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0241666A3 (en) * 1986-02-18 1988-04-20 Dragerwerk Aktiengesellschaft Gas meter and warning device
CN106248595A (en) * 2016-08-04 2016-12-21 西安热工研究院有限公司 Bivalent mercury and the test system and method for nonvalent mercury in a kind of coal-fired plant flue gas
CN106248595B (en) * 2016-08-04 2023-06-27 西安热工研究院有限公司 System and method for testing bivalent mercury and zero-valent mercury in flue gas of coal-fired power plant

Also Published As

Publication number Publication date
FR2419517B1 (en) 1984-01-06
FI69930C (en) 1986-05-26
JPS54157689A (en) 1979-12-12
JPS5912132B2 (en) 1984-03-21
FR2419517A1 (en) 1979-10-05
GB2016142B (en) 1982-07-07
BE874449A (en) 1979-06-18
DE2903017C2 (en) 1983-12-08
CA1085647A (en) 1980-09-16
FI790325A7 (en) 1979-09-08
FI69930B (en) 1985-12-31
DE2903017A1 (en) 1979-09-20

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Legal Events

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