CA950556A - Smoke detectors - Google Patents
Smoke detectorsInfo
- Publication number
- CA950556A CA950556A CA126,662,A CA126662A CA950556A CA 950556 A CA950556 A CA 950556A CA 126662 A CA126662 A CA 126662A CA 950556 A CA950556 A CA 950556A
- Authority
- CA
- Canada
- Prior art keywords
- smoke detectors
- detectors
- smoke
- 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
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
- G08B17/11—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
-
- 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
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Emergency Management (AREA)
- Business, Economics & Management (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Theoretical Computer Science (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Mathematical Physics (AREA)
- Engineering & Computer Science (AREA)
- Fire-Detection Mechanisms (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5589170 | 1970-11-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA950556A true CA950556A (en) | 1974-07-02 |
Family
ID=10475138
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA126,662,A Expired CA950556A (en) | 1970-11-24 | 1971-11-02 | Smoke detectors |
Country Status (4)
Country | Link |
---|---|
CA (1) | CA950556A (en) |
GB (1) | GB1313877A (en) |
MY (1) | MY7400050A (en) |
ZA (1) | ZA717125B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110675591A (en) * | 2019-09-14 | 2020-01-10 | 杭州拓深科技有限公司 | Anti-interference photoelectric smoke detection method and detection module |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0011364B1 (en) * | 1978-09-29 | 1983-05-18 | Chubb Fire Limited | Heat detector circuit |
US4306230A (en) * | 1979-12-10 | 1981-12-15 | Honeywell Inc. | Self-checking photoelectric smoke detector |
US9189940B2 (en) * | 2011-12-14 | 2015-11-17 | Microchip Technology Incorporated | Method and apparatus for detecting smoke in an ion chamber |
US9207209B2 (en) * | 2011-12-14 | 2015-12-08 | Microchip Technology Incorporated | Method and apparatus for detecting smoke in an ion chamber |
EP3131073A1 (en) * | 2015-08-13 | 2017-02-15 | Siemens Schweiz AG | Smoke detection unit having light emitting diodes and photoreceiver, and with an led chip in the light emitting diode and photosensor for determining an aging level and/or a light current compensation value, and light emitting diode |
-
1970
- 1970-11-24 GB GB5589170A patent/GB1313877A/en not_active Expired
-
1971
- 1971-10-25 ZA ZA717125A patent/ZA717125B/en unknown
- 1971-11-02 CA CA126,662,A patent/CA950556A/en not_active Expired
-
1974
- 1974-12-31 MY MY197450A patent/MY7400050A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110675591A (en) * | 2019-09-14 | 2020-01-10 | 杭州拓深科技有限公司 | Anti-interference photoelectric smoke detection method and detection module |
Also Published As
Publication number | Publication date |
---|---|
ZA717125B (en) | 1972-12-27 |
MY7400050A (en) | 1974-12-31 |
GB1313877A (en) | 1973-04-18 |
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