JPS54133371A - Underground depth measuring method of subaqueous cable - Google Patents
Underground depth measuring method of subaqueous cableInfo
- Publication number
- JPS54133371A JPS54133371A JP4083878A JP4083878A JPS54133371A JP S54133371 A JPS54133371 A JP S54133371A JP 4083878 A JP4083878 A JP 4083878A JP 4083878 A JP4083878 A JP 4083878A JP S54133371 A JPS54133371 A JP S54133371A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- cable
- distance
- search coil
- voltage
- 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
- Electric Cable Installation (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
PURPOSE: To measure the underground depth of a cable accurately and promptly, by using search coil and echo sounder and finding the difference between the distance of search coil and cable measured by search coil and the distance of search coil and bottom of water measured by echo sounder.
CONSTITUTION: A search coil 7 having a plurality of solenoid coils 7' disposed on a straight line at specified intervals is suspended in water, and an echo sounder 9 is disposed above the search coil aboard a survery ship 4. By this ship the search coil 7 is moved in a direction orthogonal to a cable 1. When the voltage of solenoid coil 7'a recorded in a receiving set 8 reaches the maximum, the voltage of coil 7'b is determined, and the distance between the coil 7 and cable 1 is obtained from the ratio K of the voltage and the spacing D of both coils, according to formula [I]. When the voltage induced to the reference coil 7' reaches the maximum, the distance d2 between the coil 7 and bottom of water 2 is determined from the observation by the echo sounder 9. Hence, from (d1-d2), the distance between cable 1 and bottom 2, namely, the underground depth, is determined.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4083878A JPS54133371A (en) | 1978-04-07 | 1978-04-07 | Underground depth measuring method of subaqueous cable |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4083878A JPS54133371A (en) | 1978-04-07 | 1978-04-07 | Underground depth measuring method of subaqueous cable |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54133371A true JPS54133371A (en) | 1979-10-17 |
Family
ID=12591750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4083878A Pending JPS54133371A (en) | 1978-04-07 | 1978-04-07 | Underground depth measuring method of subaqueous cable |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54133371A (en) |
-
1978
- 1978-04-07 JP JP4083878A patent/JPS54133371A/en active Pending
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