CN207946520U - A kind of ground determines the device of power cable fore-and-aft distance - Google Patents
A kind of ground determines the device of power cable fore-and-aft distance Download PDFInfo
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- CN207946520U CN207946520U CN201820475107.5U CN201820475107U CN207946520U CN 207946520 U CN207946520 U CN 207946520U CN 201820475107 U CN201820475107 U CN 201820475107U CN 207946520 U CN207946520 U CN 207946520U
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Abstract
The utility model belongs to power cable operation and maintenance technical field, more particularly to a kind of ground determines the device of power cable fore-and-aft distance, including the narrow linewidth laser being sequentially connected, acousto-optic modulator, pulse amplifier, coupler, two communications optical cables for being close to be laid with parallel with the power cable of two genesis analysis, every communications optical cable is connected by circulator with the coupler, every communications optical cable passes through circulator and narrow band filter, photodetector, data collecting card is sequentially connected, described two data collecting cards are connected by data processor with computer；Shot freely falling body device is equipped at ground above the communications optical cable.The accurate measurement of the fore-and-aft distance of existing two power cables, can accurately determine the fore-and-aft distance between each power cable.
Description
Technical Field
The utility model belongs to the technical field of power cable operation maintenance, especially, relate to a device of power cable longitudinal distance is confirmed to ground.
Background
With the continuous development of urban construction, urban land is increasingly tense, power supply and distribution cables are increasingly increased, and the requirement of pipeline development can be better met by designing a comprehensive power cable pipe trench with unified planning, design, construction and operation for limited underground space. The comprehensive underground cable pipe trench can effectively utilize the urban underground space, saves resources and avoids the circuitous arrangement of pipelines. The underground cable pipe trench can improve the comprehensive disaster resistance of the city, and lays a foundation for the stable development of the city by avoiding the influence of wind, rain and fire. However, in the process of urbanization, the laying of various underground power cables is not completed at one time, even a plurality of pipelines are constructed by different constructors, the phenomena of cross aliasing and the like of the same power cable in a pipe ditch are often caused in the continuous laying process of the power cables, the phenomenon that the power cables are not orderly arranged along the line is caused until each same power cable cannot be identified, and when a certain cable is aged due to faults, the cables are difficult to clearly search along the cable in the replacement and repair processes.
Traditional power cable seeks the method that cable path in-process adopted the manual work to carry out the manual work along the circuit to distinguish usually, and this method consumes a large amount of manpower and materials, and the manual work can't effectively be tracked when power cable passes through special operating mode if passing through complicated scenes such as river, tunnel, culvert and cause the work to break off, the utility model discloses can measure in any position, high-efficient accuracy.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome above-mentioned prior art at least a defect, provide a device of ground definite power cable longitudinal distance, realize two power cable's longitudinal distance's accurate measurement, but the longitudinal distance between each power cable of accurate determination, through contrast with measured data affirmation and numbering, effectively reduce the problem that cable hash can't be discerned.
In order to solve the technical problem, the utility model discloses a technical scheme is: a device for determining the longitudinal distance of a power cable on the ground comprises a narrow-linewidth laser, an acoustic-optical modulator, a pulse amplifier, a coupler and two communication optical cables, wherein the narrow-linewidth laser, the acoustic-optical modulator, the pulse amplifier and the coupler are sequentially connected, the two communication optical cables are laid in a manner of being in close contact with the two power cables which are longitudinally distributed in parallel, each communication optical cable is connected with the coupler through a circulator, each communication optical cable is sequentially connected with a narrow-band filter, a photoelectric detector and a data acquisition card through the circulators, and the two data acquisition cards are connected with a computer through a; and a shot free falling body device is arranged on the ground above the communication optical cable.
Furthermore, the laser wavelength emitted by the narrow-linewidth laser is 1550.12nm, the linewidth is less than 3KHz, and the emission power is 20 mW.
Furthermore, the light splitting ratio of the coupler is 50:50, and the pulse laser amplified by the pulse light amplifier is uniformly split into two beams.
Further, the frequency of the narrow-band filter is 80GHz-120GHz, and preferably 100 GHz.
Further, the computer comprises a power cable longitudinal distance display module connected to the optical fiber vibration sensing host.
Compared with the prior art, the beneficial effects are: the accurate measurement of the longitudinal distance of the two power cables is realized, the longitudinal distance between the power cables can be accurately determined, the longitudinal distance is confirmed and numbered by comparing with the measurement data, and the problem that the cables in the pipe ditch are disordered and cannot be identified is effectively solved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic longitudinal distance of the power cable.
In the figure, 1, a narrow linewidth laser; 2. An acousto-optic modulator; 3. driving; 4. a pulsed light amplifier; 5. a coupler; 6. a circulator; 7. a narrow linewidth filter; 8. a photodetector; 9. a data acquisition card; 10. a data processor; 11. a computer; 12. a communications cable; 13. shot free fall device.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
As shown in fig. 1, a device for determining a longitudinal distance of a power cable on the ground includes a narrow linewidth laser 1, an acoustic-optical modulator 2, a pulse amplifier 4, a coupler 5, and two communication optical cables 12 laid in parallel and closely to the two power cables distributed longitudinally, each communication optical cable 12 is connected to the coupler 5 through a circulator 6, each communication optical cable 12 is connected to a narrow-band filter 7, a photodetector 8, and a data acquisition card 9 through the circulator 6, and the two data acquisition cards 9 are connected to a computer 11 through a data processor 10; a shot free falling body device 13 is arranged on the ground above the communication optical cable 12. Wherein,
the laser 1 with narrow line width emits laser with wavelength of 1550.12nm, line width of less than 3KHz, and emission power of 20 mW.
And the acousto-optic modulator 2 is used for modulating continuous laser emitted by the narrow linewidth laser.
The pulse optical amplifier 4 amplifies the pulse laser signal modulated by the acousto-optic modulator by 1000 times, and the power meets the real-time measurement of two links behind a subsequent light splitting optical path.
The light splitting ratio of the coupler 5 is 50:50, and the pulse laser amplified by the pulse light amplifier is uniformly split into two beams.
The circulator 6 is a three-port circulator, wherein one port is connected with one light splitting arm of the coupler, one port is connected with the communication optical cable, and the other port is connected with the line width filter 7; the narrow-band filter 7 has a filtering bandwidth of 100 GHz.
The photoelectric detector 8 detects the size of coherent Rayleigh scattering in backward scattering of the optical fiber by adopting a high-sensitivity avalanche diode, converts a detected optical signal into a current signal, performs current-voltage conversion through a circuit part in the current signal and finally outputs the current signal to the data acquisition card.
And the data acquisition card 9 adopts a high-performance operational amplifier circuit to carry out signal preprocessing on the acquired voltage signals, and the sampling frequency of the data acquisition card is 100 MHz.
The computer 11 comprises a power cable longitudinal positioning detection display module which automatically records the vibration response time difference of the two optical cables and automatically calculates the longitudinal distance of the two optical cables according to the vibration response time difference.
The shot free-fall device 13 is used to create vibrations.
The operation of the device for determining the longitudinal distance of a power cable from the ground is as follows,
the free falling body device 13 is brought to a position needing to be identified on a power cable road, a shot-put action is carried out on one side of the power cable through the free falling body device 13, when the shot falls on the ground, an optical cable t1 close to a shot vibration point vibrates, an optical cable t2 far away from the shot vibration point vibrates, the vibration time difference t = t2-t1 of the two optical cables is obtained, and the propagation speed of the shot vibration in the corresponding ground is equal to that of the shot vibration inThe longitudinal distance s = vt of the two power cables.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (5)
1. An apparatus for determining the longitudinal distance of a power cable from the ground, characterized by: the device comprises a narrow linewidth laser (1), an acousto-optic modulator (2), a pulse light amplifier (4) and a coupler (5) which are sequentially connected, and two communication optical cables (12) which are laid in a close contact manner in parallel with two longitudinally distributed power cables, wherein each communication optical cable (12) is connected with the coupler (5) through a circulator (6), each communication optical cable (12) is sequentially connected with a narrow linewidth filter (7), a photoelectric detector (8) and a data acquisition card (9) through the circulators (6), and the two data acquisition cards (9) are connected with a computer (11) through a data processor (10); and a shot free falling device (13) is arranged on the ground above the communication optical cable (12).
2. An apparatus for determining the longitudinal distance of a power cable from the ground according to claim 1, characterized in that: the narrow linewidth laser (1) has the advantages that the emitting laser wavelength is 1550.12nm, the linewidth is less than 3KHz, and the emitting power is 20 mW.
3. An apparatus for determining the longitudinal distance of a power cable from the ground according to claim 1, characterized in that: the light splitting ratio of the coupler (5) is 50:50, and the pulse laser amplified by the pulse light amplifier (4) is uniformly divided into two beams.
4. An apparatus for determining the longitudinal distance of a power cable from the ground according to claim 1, characterized in that: the frequency of the narrow linewidth filter (7) is 80GHz-120 GHz.
5. An apparatus for determining the longitudinal distance of a power cable from the ground according to claim 1, characterized in that: the computer (11) comprises a power cable longitudinal distance display module connected to the optical fiber vibration sensing host.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820475107.5U CN207946520U (en) | 2018-04-04 | 2018-04-04 | A kind of ground determines the device of power cable fore-and-aft distance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820475107.5U CN207946520U (en) | 2018-04-04 | 2018-04-04 | A kind of ground determines the device of power cable fore-and-aft distance |
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| CN207946520U true CN207946520U (en) | 2018-10-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387889A (en) * | 2018-04-04 | 2018-08-10 | 广东电网有限责任公司 | A kind of ground determines the device of power cable fore-and-aft distance |
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2018
- 2018-04-04 CN CN201820475107.5U patent/CN207946520U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387889A (en) * | 2018-04-04 | 2018-08-10 | 广东电网有限责任公司 | A kind of ground determines the device of power cable fore-and-aft distance |
| CN108387889B (en) * | 2018-04-04 | 2024-01-16 | 广东电网有限责任公司 | Device for determining longitudinal distance of power cable on ground |
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