GB1291468A - Apparatus for detecting the presence in the atmosphere of a substance or gas - Google Patents
Apparatus for detecting the presence in the atmosphere of a substance or gasInfo
- Publication number
- GB1291468A GB1291468A GB5422669A GB5422669A GB1291468A GB 1291468 A GB1291468 A GB 1291468A GB 5422669 A GB5422669 A GB 5422669A GB 5422669 A GB5422669 A GB 5422669A GB 1291468 A GB1291468 A GB 1291468A
- Authority
- GB
- United Kingdom
- Prior art keywords
- paper
- photo
- exposed
- atmosphere
- light
- 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
- 239000000126 substance Substances 0.000 title 1
- 239000007789 gas Substances 0.000 abstract 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 abstract 3
- FLKPEMZONWLCSK-UHFFFAOYSA-N diethyl phthalate Chemical compound CCOC(=O)C1=CC=CC=C1C(=O)OCC FLKPEMZONWLCSK-UHFFFAOYSA-N 0.000 abstract 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 abstract 2
- HRNSEOMPRWUKQL-UHFFFAOYSA-N 2-hydroxy-n-(4-methoxyphenyl)-11h-benzo[a]carbazole-3-carboxamide Chemical compound C1=CC(OC)=CC=C1NC(=O)C1=CC2=CC=C(C=3C(=CC=CC=3)N3)C3=C2C=C1O HRNSEOMPRWUKQL-UHFFFAOYSA-N 0.000 abstract 1
- USFZMSVCRYTOJT-UHFFFAOYSA-N Ammonium acetate Chemical compound N.CC(O)=O USFZMSVCRYTOJT-UHFFFAOYSA-N 0.000 abstract 1
- 239000005695 Ammonium acetate Substances 0.000 abstract 1
- 235000019257 ammonium acetate Nutrition 0.000 abstract 1
- 229940043376 ammonium acetate Drugs 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 abstract 1
- 238000005070 sampling Methods 0.000 abstract 1
- 235000010288 sodium nitrite Nutrition 0.000 abstract 1
- 125000005628 tolylene group Chemical group 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
- G01N21/84—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)
Abstract
1291468 Detecting dangerous gases DUNLOP CO Ltd 28 Oct 1970 [5 Nov 1969] 54226/69 Heading G1A A device for detecting a dangerous gas comprises a strip of paper, whose optical characteristics are sensitive to the gas and which is passed so as to interrupt two light beams, one light beam being interrupted by a part of the paper which has been exposed to an atmosphere thought to contain the gas while the other beam is interrupted by a part of the paper which has not been so exposed; each light beam being incident on a photo-cell whose outputs are compared to detect the presence or absence of the dangerous gas. In an embodiment, Fig. 2, sensitized paper tape 28 is unwound from a roll 26 by means of a drive roll 27 so as to travel past two separate photo-cells 34 and 35. After the paper has past photo-cell 34 it is exposed to the atmosphere by means of a sampling gate 36 through which some of the atmosphere to be tested is pumped. A light beam from a source 37 is split by a semi-reflective mirror 38 so that one beam passes through exposed paper to photo-cell 35 and the other beam passes through unexposed paper to photo-cell 34. The electrical outputs of the two photo-cells are compared and any difference (indicating the presence of the dangerous gas) is fed via an amplifier to a meter, Fig. 3 (not shown), calibrated in p.p.m. The meter is monitored by a constant current device which actuates an alarm when the concentration exceeds a predetermined level. In another embodiment, Fig. 5, the light from a source is directed along two paths by a bifurcated light guide 40 on to two separate tracks 44, 45 on the sensitized paper. One track 45 being exposed to the atmosphere, the other 44 remaining unexposed. The light paths are directed so that the two beams are reflected off the tracks to be incident on two separate photocells 34 and 35. A further electrical circuit is disclosed similar to the above including a threshold amplifier to actuate the alarm. The detection of Tolylene di-isocynate by a paper treated with a solution of sodium nitrite, 2-Hydroxyl-11 H- benzo a carbazole-3-carboxy-p-aniside (Brenthol GB), ammonium acetate and diethyl phthalate in methanol is exemplified.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5422669A GB1291468A (en) | 1969-11-05 | 1969-11-05 | Apparatus for detecting the presence in the atmosphere of a substance or gas |
| AU21883/70A AU2188370A (en) | 1969-11-05 | 1970-11-05 | Improvements in and relating to detecting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5422669A GB1291468A (en) | 1969-11-05 | 1969-11-05 | Apparatus for detecting the presence in the atmosphere of a substance or gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1291468A true GB1291468A (en) | 1972-10-04 |
Family
ID=10470337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5422669A Expired GB1291468A (en) | 1969-11-05 | 1969-11-05 | Apparatus for detecting the presence in the atmosphere of a substance or gas |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU2188370A (en) |
| GB (1) | GB1291468A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0447931A3 (en) * | 1990-03-20 | 1992-02-26 | Tecsa S.P.A. | Infrared laser fibre optics gas detection device |
| RU2335755C1 (en) * | 2007-01-22 | 2008-10-10 | Федеральное государственное унитарное предприятие "Научно-исследовательский технологический институт имени А.П. Александрова" | Device for residue low-volatile substance detection on fingers |
-
1969
- 1969-11-05 GB GB5422669A patent/GB1291468A/en not_active Expired
-
1970
- 1970-11-05 AU AU21883/70A patent/AU2188370A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0447931A3 (en) * | 1990-03-20 | 1992-02-26 | Tecsa S.P.A. | Infrared laser fibre optics gas detection device |
| RU2335755C1 (en) * | 2007-01-22 | 2008-10-10 | Федеральное государственное унитарное предприятие "Научно-исследовательский технологический институт имени А.П. Александрова" | Device for residue low-volatile substance detection on fingers |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2188370A (en) | 1972-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |