JPH03120268U - - Google Patents
Info
- Publication number
- JPH03120268U JPH03120268U JP2869190U JP2869190U JPH03120268U JP H03120268 U JPH03120268 U JP H03120268U JP 2869190 U JP2869190 U JP 2869190U JP 2869190 U JP2869190 U JP 2869190U JP H03120268 U JPH03120268 U JP H03120268U
- Authority
- JP
- Japan
- Prior art keywords
- transducer
- signal
- abnormality
- reflector
- ultrasonic waves
- 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
- 238000001514 detection method Methods 0.000 claims description 2
- 230000005856 abnormality Effects 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Emergency Alarm Devices (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2869190U JPH03120268U (en]) | 1990-03-20 | 1990-03-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2869190U JPH03120268U (en]) | 1990-03-20 | 1990-03-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03120268U true JPH03120268U (en]) | 1991-12-10 |
Family
ID=31531484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2869190U Pending JPH03120268U (en]) | 1990-03-20 | 1990-03-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03120268U (en]) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000043728A (ja) * | 1998-07-29 | 2000-02-15 | Railway Technical Res Inst | 通行異常検知装置 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5068290A (en]) * | 1973-10-17 | 1975-06-07 | ||
| JPS50153893A (en]) * | 1974-05-31 | 1975-12-11 |
-
1990
- 1990-03-20 JP JP2869190U patent/JPH03120268U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5068290A (en]) * | 1973-10-17 | 1975-06-07 | ||
| JPS50153893A (en]) * | 1974-05-31 | 1975-12-11 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000043728A (ja) * | 1998-07-29 | 2000-02-15 | Railway Technical Res Inst | 通行異常検知装置 |