EP0135362B1 - Optische Rauchdetektoren - Google Patents
Optische Rauchdetektoren Download PDFInfo
- Publication number
- EP0135362B1 EP0135362B1 EP84305514A EP84305514A EP0135362B1 EP 0135362 B1 EP0135362 B1 EP 0135362B1 EP 84305514 A EP84305514 A EP 84305514A EP 84305514 A EP84305514 A EP 84305514A EP 0135362 B1 EP0135362 B1 EP 0135362B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sampling chamber
- light
- window
- reflector means
- reflector
- 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 - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
- G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
- G08B17/113—Constructional details
Definitions
- This invention relates to an optical smoke detector of extremely high sensitivity.
- a similar detector is disclosed in my European Patent Application EP-A-140 502 with the same priority date as the present application.
- the present invention is particularly adapted for use with an axial-light absorber as described in my European Application EP-A-135 361, also having the same priority date, and can utilise a sampling chamber as disclosed in my European Application EP-A-140 502.
- optical smoke detectors it is necessary to provide a light source of low capacity to irradiate any smoke particles that are drawn into the sampling chamber.
- Reduction in energy input lengthens the operational life of the light tube and serves to decrease current drain from a standby battery required to maintain operation in the event of mains failure. Reduction in current drain either increases the life of the battery or reduces the capacity requirement and therefore the cost of the standby battery.
- the present invention is directed at allowing the use of low energy consumption light sources to provide the aforementioned advantage.
- light sources such as Xenon flash tubes
- the instant invention has as an object the provision of a smoke detector which is able to use such elongate light sources, by including suitable reflecting means to usefully focus the light energy produced.
- U.S. Patent No. 2,812,686 discloses a pollution detector. It, however, relies on a substantially point-source light source, and uses lenses rather than a specially configured reflector as in the instant invention.
- French Patent No. FR-A-2348502 discloses various reflectors for light sources. It does not teach the application of these light sources to pollution detection apparatus. It further does not reach the use in a pollution detector of an elongate light source, nor a reflector having a corresponding configuration to an elongate light source.
- the present invention provides smoke detecting apparatus comprising:
- the reflector means is supported by means comprising a mounting base and peripheral flanges for mounting said reflector means in sealed relation on said sampling chamber.
- the window in the sampling chamber may be an open window to enable circulation of the atmosphere in the sampling chamber within the reflector body when in operation.
- the reflector body 60 includes a concave U-shaped reflector element 61 designed to focus light impinging thereon from each infinitesimal cross-sectional element of a U-shaped Xenon flash tube into a central region 72 of air sampling chamber 70.
- the body 60 is attached to a flat surface of the chamber 70 by sealing flanges 60a and 60b.
- the flat surface 71 of chamber 70 enables simplified sealing and allows the use of an open window 74 for transmission of light into the chamber.
- the open window allows for circulation of air around the flash tube 62 thereby preventing the build up of potentially damaging ozone in the device.
- the light window 74 may be sealed by clear glass or plastic (not shown) to seal the reflector chamber, whereby the reflector chamber 60 can be filled with an inert gas such as nitrogen.
- an inert gas such as nitrogen.
- a flash tube of quartz glass which prevents the formation of potentially corrosive ozone, can be used.
- an inert gas is costly whereas the latter alternative prevents detection of scattered ultra-violet light, thereby altering the calibration of the sampling tube in respect of certain products of combustion.
- the reflector 60 is provided with a mounting base 63 which is preferably in the form of a printed circuit board serving as a mounting for the electrode leads of the flash tube 62. Sealing of the circuit board base 63 to the reflector body 60 by sealing flange 60c and sealing of the flanges 60a and 60b to the side of the sampling tube 71 is preferably achieved by a silicone rubber glue. This allows operation of the chamber at other than atmospheric pressure.
- the size of the window aperture 74 and the spacing between the light tube 62 and the window together with the focal distance of the concave curved reflector are each optimized to maximize light intensity within the sampling chamber without unduly increasing spurious or stray incident light reflected off the internal walls of the sampling chamber.
- the curvature of the reflecting element is developed to follow the "U" shape of the flash tube such that the light output from the whole length of the tube is focused through the flash window into the centre of the sampling chamber.
- the use of the present invention directly results in a reduction of energy consumption of the lamp by a factor of 2 and without any loss of sensitivity in the detector.
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fire-Detection Mechanisms (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Claims (3)
dadurch gekennzeichnet, daß besagte Lichtquelle (62) einen U-förmigen Xenon-Röhrenblitz umfaßt;
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84305514T ATE51963T1 (de) | 1983-08-12 | 1984-08-13 | Optische rauchdetektoren. |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU822/83 | 1983-08-12 | ||
AUPG082283 | 1983-08-12 | ||
AU31843/84A AU577538B2 (en) | 1983-08-12 | 1984-08-10 | Optical smoke detectors |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0135362A2 EP0135362A2 (de) | 1985-03-27 |
EP0135362A3 EP0135362A3 (en) | 1986-06-25 |
EP0135362B1 true EP0135362B1 (de) | 1990-04-11 |
Family
ID=25621949
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84305514A Expired - Lifetime EP0135362B1 (de) | 1983-08-12 | 1984-08-13 | Optische Rauchdetektoren |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0135362B1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0462278A4 (en) * | 1990-01-05 | 1993-03-03 | Sredneaziatsky Nauchno-Issledovatelsky I Proektny Institut Tsvetnoi Mettallurgii | Device for measuring gas optical density |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2812686A (en) * | 1953-12-22 | 1957-11-12 | Johns Manville | Smoke photometer |
DE1797079C3 (de) * | 1968-08-12 | 1981-05-14 | Olympus Optical Co., Ltd., Tokyo | Mit einer photographischer Kamera verbindbares Blitzlichtgerät |
SE393864B (sv) * | 1975-12-01 | 1977-06-20 | Svenska Traeforskningsinst | Forfarande for koncentrationsbestemning |
FR2348502A1 (fr) * | 1976-04-15 | 1977-11-10 | Luderitz Willy | Reflecteur trifocal a miroirs |
DE2624977A1 (de) * | 1976-06-03 | 1977-12-08 | Rumpf Hans Prof Dr Ing | Streulichtmesseinrichtung zur ermittlung von partikelgroessenverteilungen und partikelstromdichten disperser phasen in stroemungen |
DE3112816A1 (de) * | 1981-03-31 | 1982-10-14 | Gebr. Kaiser Gmbh & Co Leuchten Kg Lichttechnische Spezialfabrik, 5760 Arnsberg | Downlight-leuchte |
-
1984
- 1984-08-13 EP EP84305514A patent/EP0135362B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0135362A2 (de) | 1985-03-27 |
EP0135362A3 (en) | 1986-06-25 |
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