JPS6415897A - Fire sensor - Google Patents
Fire sensorInfo
- Publication number
- JPS6415897A JPS6415897A JP17105887A JP17105887A JPS6415897A JP S6415897 A JPS6415897 A JP S6415897A JP 17105887 A JP17105887 A JP 17105887A JP 17105887 A JP17105887 A JP 17105887A JP S6415897 A JPS6415897 A JP S6415897A
- Authority
- JP
- Japan
- Prior art keywords
- loss
- optical fiber
- location
- fire
- variation
- 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
Landscapes
- Fire Alarms (AREA)
Abstract
PURPOSE:To detect the location of fire occurrence by providing plural pieces of thermal sensors constituted of a junction surface where the optical axis shifts due to temperature variation in series connection to an optical fiber, and detecting the variation in the reflection loss of a laser beam by the thermal sensor. CONSTITUTION:The thermal sensors a A1-A4 are constituted in a manner that the optical fiber is cut and the cut ends brought into contact with each other so that the optical fiber axis will shift at the splicing part by the variation of temperature. These sensors A1-A4 are arranged in series to one piece of optical fiber B0. An electric pulse is converted to a pulse-shaped optical signal, which is made incident on the fiber B0. The incident beam is reflected by the thermal sensors A1-A4, the amount of loss of the beam is measured, and the loss amount is A/D-converted then stored in a digital memory. In the memory, the data of beam-loss amount at a normal time is separately stored. In case of a fire, the beam loss detected by the thermal sensor in the location of the fire increases, and this increased loss is compared with the data at normal time, and the location of the fire occurrence is thus detected.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17105887A JPS6415897A (en) | 1987-07-10 | 1987-07-10 | Fire sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17105887A JPS6415897A (en) | 1987-07-10 | 1987-07-10 | Fire sensor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6415897A true JPS6415897A (en) | 1989-01-19 |
Family
ID=15916287
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17105887A Pending JPS6415897A (en) | 1987-07-10 | 1987-07-10 | Fire sensor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6415897A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112735074A (en) * | 2020-12-15 | 2021-04-30 | 中安物联云科技(深圳)有限公司 | Early warning communication sending system for electrical fire equipment |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5923884B2 (en) * | 1980-02-20 | 1984-06-05 | 新日本製鐵株式会社 | Tension control method |
JPS59157910A (en) * | 1983-02-24 | 1984-09-07 | 株式会社フジクラ | Power wire with temperature monitor |
-
1987
- 1987-07-10 JP JP17105887A patent/JPS6415897A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5923884B2 (en) * | 1980-02-20 | 1984-06-05 | 新日本製鐵株式会社 | Tension control method |
JPS59157910A (en) * | 1983-02-24 | 1984-09-07 | 株式会社フジクラ | Power wire with temperature monitor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112735074A (en) * | 2020-12-15 | 2021-04-30 | 中安物联云科技(深圳)有限公司 | Early warning communication sending system for electrical fire equipment |
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