JPS5742842A - Photoelectric smoke sensor - Google Patents
Photoelectric smoke sensorInfo
- Publication number
- JPS5742842A JPS5742842A JP11704780A JP11704780A JPS5742842A JP S5742842 A JPS5742842 A JP S5742842A JP 11704780 A JP11704780 A JP 11704780A JP 11704780 A JP11704780 A JP 11704780A JP S5742842 A JPS5742842 A JP S5742842A
- Authority
- JP
- Japan
- Prior art keywords
- photodetector
- scattered
- light
- photodetection
- projector
- 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.)
- Pending
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
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (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 Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
PURPOSE:To improve sensitivity by providing a projector, a reflecting plate for a light beam, and a photodetector for light scattered by smoke in an optical path, and by outputting a detection signal when the output voltage of the scattered-light detector increases above a prescribed value. CONSTITUTION:A light beam 2 emitted from a projector 1 is reflected more than once by a couple of reflecting plats 3 and 4. A photodetector 5 photodetects scattered light from its circumference to convert the detection result into a voltage which corresponds to the amount of photodetection, and the output voltage of the photodetector 5 is supplied to a detecting circuit 6. The detecting circuit 6, when the input voltage exceeds a certain value, outputs a detection signal. The photodetector 5 receives all of the light beams 2-1, 2-2, 2-3, 2-4, etc., scattered by striking smoke in passing by it, so the amount of photodetection increases to improve sensitivity.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11704780A JPS5742842A (en) | 1980-08-27 | 1980-08-27 | Photoelectric smoke sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11704780A JPS5742842A (en) | 1980-08-27 | 1980-08-27 | Photoelectric smoke sensor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5742842A true JPS5742842A (en) | 1982-03-10 |
Family
ID=14702104
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11704780A Pending JPS5742842A (en) | 1980-08-27 | 1980-08-27 | Photoelectric smoke sensor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5742842A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59221640A (en) * | 1983-05-31 | 1984-12-13 | Matsushita Electric Works Ltd | Smoke sensor |
JPS601541A (en) * | 1983-06-20 | 1985-01-07 | Nippon Denso Co Ltd | Smoke detecting device |
EP0203600A2 (en) * | 1985-05-28 | 1986-12-03 | Idemitsu Kosan Company Limited | Method of and apparatus for measuring floating fine particles |
EP0231542A2 (en) * | 1985-12-10 | 1987-08-12 | High Yield Technology | Particle detector for wafer processing equipment and method of detecting a particle |
EP0321265A2 (en) * | 1987-12-18 | 1989-06-21 | Fujitsu Limited | Optoelectrical particle detection apparatus |
JPH0283435A (en) * | 1988-09-20 | 1990-03-23 | Nec Corp | System for measuring light absorption factor of low light absorption factor object |
US5024526A (en) * | 1988-04-06 | 1991-06-18 | Deutsche Forschungs- Und Versuchsanstalt Fur Luft- Und Raumfahrt E.V. | Measuring instrument for determining the scattering and absorption coefficient of the atmosphere |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5036799A (en) * | 1973-07-13 | 1975-04-07 | ||
JPS5444582A (en) * | 1977-09-14 | 1979-04-09 | Matsushita Electric Ind Co Ltd | Smoke detector |
-
1980
- 1980-08-27 JP JP11704780A patent/JPS5742842A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5036799A (en) * | 1973-07-13 | 1975-04-07 | ||
JPS5444582A (en) * | 1977-09-14 | 1979-04-09 | Matsushita Electric Ind Co Ltd | Smoke detector |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59221640A (en) * | 1983-05-31 | 1984-12-13 | Matsushita Electric Works Ltd | Smoke sensor |
JPS601541A (en) * | 1983-06-20 | 1985-01-07 | Nippon Denso Co Ltd | Smoke detecting device |
JPH051415B2 (en) * | 1983-06-20 | 1993-01-08 | Nippon Denso Kk | |
EP0203600A2 (en) * | 1985-05-28 | 1986-12-03 | Idemitsu Kosan Company Limited | Method of and apparatus for measuring floating fine particles |
US4848905A (en) * | 1985-05-28 | 1989-07-18 | Idemitsu Kosan Company Limited | Method of and apparatus for measuring suspended fine particles |
EP0231542A2 (en) * | 1985-12-10 | 1987-08-12 | High Yield Technology | Particle detector for wafer processing equipment and method of detecting a particle |
EP0321265A2 (en) * | 1987-12-18 | 1989-06-21 | Fujitsu Limited | Optoelectrical particle detection apparatus |
US5094533A (en) * | 1987-12-18 | 1992-03-10 | Fujitsu Limited | Optoelectrical particle detection apparatus |
US5024526A (en) * | 1988-04-06 | 1991-06-18 | Deutsche Forschungs- Und Versuchsanstalt Fur Luft- Und Raumfahrt E.V. | Measuring instrument for determining the scattering and absorption coefficient of the atmosphere |
JPH0283435A (en) * | 1988-09-20 | 1990-03-23 | Nec Corp | System for measuring light absorption factor of low light absorption factor object |
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