JPS6439596U - - Google Patents
Info
- Publication number
- JPS6439596U JPS6439596U JP13427787U JP13427787U JPS6439596U JP S6439596 U JPS6439596 U JP S6439596U JP 13427787 U JP13427787 U JP 13427787U JP 13427787 U JP13427787 U JP 13427787U JP S6439596 U JPS6439596 U JP S6439596U
- Authority
- JP
- Japan
- Prior art keywords
- optical signal
- reference optical
- warning
- reflected
- time
- 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
- 230000003287 optical effect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 claims 1
- 230000005856 abnormality Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Emergency Alarm Devices (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13427787U JPS6439596U (en, 2012) | 1987-09-02 | 1987-09-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13427787U JPS6439596U (en, 2012) | 1987-09-02 | 1987-09-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6439596U true JPS6439596U (en, 2012) | 1989-03-09 |
Family
ID=31392889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13427787U Pending JPS6439596U (en, 2012) | 1987-09-02 | 1987-09-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6439596U (en, 2012) |
-
1987
- 1987-09-02 JP JP13427787U patent/JPS6439596U/ja active Pending
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