JPS5636043A - Gas detecting system - Google Patents
Gas detecting systemInfo
- Publication number
- JPS5636043A JPS5636043A JP11222279A JP11222279A JPS5636043A JP S5636043 A JPS5636043 A JP S5636043A JP 11222279 A JP11222279 A JP 11222279A JP 11222279 A JP11222279 A JP 11222279A JP S5636043 A JPS5636043 A JP S5636043A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- beams
- time
- laser beams
- leakage
- 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
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
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Optics & Photonics (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
PURPOSE:To find out exactly the place of leakage of the gas based on the amount of absorption of laser beams and the change with time thereof by using parallel infrared laser beams in plural. CONSTITUTION:Parallel laser beams B1 and B2 arranged at an interval (d) reach detectors S1 and S2 from the sources of beams L1 and L2. When the gas leaks at the point A in a zone Z3 and if the velocity of diffusion is nearly at a fixed value (v), the gas diffuses from the point A in the form of a concentric circle. And, when the absorption of beams by the gas is detected with the system of the beam B1 at a time t1 and with the system of the beam B2 at a time t2, the output of the detectors S1 and S2 show the difference in time (t2-t1) as shown by curved lines P<1> and P2, thereby the respective transmitting beams P is reduced. Based on the ratio between times t1 and t2, the position of leakage of the gas can be detected exactly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11222279A JPS608734B2 (en) | 1979-08-31 | 1979-08-31 | gas detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11222279A JPS608734B2 (en) | 1979-08-31 | 1979-08-31 | gas detection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5636043A true JPS5636043A (en) | 1981-04-09 |
| JPS608734B2 JPS608734B2 (en) | 1985-03-05 |
Family
ID=14581302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11222279A Expired JPS608734B2 (en) | 1979-08-31 | 1979-08-31 | gas detection system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS608734B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004219379A (en) * | 2003-01-17 | 2004-08-05 | Mitsubishi Heavy Ind Ltd | System for monitoring gas concentration |
| JP2015045614A (en) * | 2013-08-29 | 2015-03-12 | 日本電信電話株式会社 | Space temperature estimation method and device |
-
1979
- 1979-08-31 JP JP11222279A patent/JPS608734B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004219379A (en) * | 2003-01-17 | 2004-08-05 | Mitsubishi Heavy Ind Ltd | System for monitoring gas concentration |
| JP2015045614A (en) * | 2013-08-29 | 2015-03-12 | 日本電信電話株式会社 | Space temperature estimation method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS608734B2 (en) | 1985-03-05 |
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