CN111504607A - Method for searching optical cable breakpoint by using acoustic principle - Google Patents
Method for searching optical cable breakpoint by using acoustic principle Download PDFInfo
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- CN111504607A CN111504607A CN202010396577.4A CN202010396577A CN111504607A CN 111504607 A CN111504607 A CN 111504607A CN 202010396577 A CN202010396577 A CN 202010396577A CN 111504607 A CN111504607 A CN 111504607A
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- optical cable
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
- G01M11/3109—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR
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- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention belongs to a method for searching an optical cable breakpoint, and particularly relates to a method for searching an optical cable breakpoint by using an acoustic principle. The method utilizes the acoustic principle, thereby accurately and quickly finding out the optical cable breakpoint under special conditions that the optical cable has no obvious trauma and the like. The method comprises the following steps: step 1, measuring the length m of the optical cable breakpoint distance test point by using OTDR. Step 2, knowing that the twisting percentage of the optical cable is X, and according to a formula M = M/(X + 1); and calculating the actual calibration length M of the optical cable breakpoint distance test point. And 3, finding out the length position of the test breakpoint on site according to the actual calibration length M. Step 4, knocking the optical cable with the break point at the test break point position, and testing at the test point by using an optical cable general inspection instrument, wherein if a test signal exists at the knock position, the optical cable break point is not detected, and continuously inspecting in the extending direction; if no test signal exists at the knocking part, continuously checking towards the direction of the test point; and performing fine positioning. And 5, until the breakpoint is found.
Description
Technical Field
The invention belongs to a method for searching an optical cable breakpoint, and particularly relates to a method for searching an optical cable breakpoint by using an acoustic principle.
Background
In the traditional optical cable breakpoint searching, the length of a breakpoint distance test point is mostly tested by using an OTDR (optical time Domain reflectometer), and the breakpoint is searched by searching the optical cable, but if the optical cable has no obvious external damage or the conditions that the underground direct-buried optical cable excavation searching is time-consuming and labor-consuming and the like, the traditional searching method can have the problems that the optical cable breakpoint is difficult to judge and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for searching an optical cable breakpoint by using an acoustic principle. Under the condition that the OTDR searches the optical cable breakpoint, the acoustic principle is utilized, and the optical cable general-searching instrument equipment is added, so that the optical cable breakpoint under the special conditions that the optical cable has no obvious trauma and the like can be accurately and quickly searched.
In order to achieve the purpose, the invention adopts the following technical scheme that the method comprises the following steps: step 1, measuring the length m of the optical cable breakpoint distance test point by using OTDR.
Step 2, knowing that the twisting percentage of the optical cable is X, and according to a formula M = M/(X + 1); wherein M represents the actual calibration length of the photoelectric breakpoint distance test point; and calculating the actual calibration length M of the optical cable breakpoint distance test point.
And 3, finding out the length position of the test breakpoint on site according to the actual calibration length M to finish coarse positioning.
Step 4, knocking the optical cable with the break point at the test break point position, and testing at the test point by using an optical cable general inspection instrument, wherein if a test signal exists at the knock position, the optical cable break point is not detected, and continuously inspecting in the extending direction; if no test signal exists at the knocking part, continuously checking towards the direction of the test point; and performing fine positioning.
And 5, until the breakpoint is found.
Further, in step 1, the length m of the optical cable breakpoint distance test point is measured in the test room or the interval test point by using the OTDR.
Further, the unit of the length m of the optical cable breakpoint distance test point is meter.
Further, the unit of the actual length M of the photoelectric breakpoint to the test point is meter.
Furthermore, in step 3, the length position of the test breakpoint is searched on site by integrating several types and factors of the optical cable breakpoint in the trench, the direct-buried optical cable breakpoint or the aerial optical cable breakpoint.
Compared with the prior art, the invention has the beneficial effects.
The invention utilizes the acoustic principle and adds the optical cable general-searching instrument equipment under the condition that the OTDR searches the optical cable breakpoint, thereby accurately and quickly finding the optical cable breakpoint under the special conditions that the optical cable has no obvious trauma and the like.
Drawings
The invention is further described with reference to the following figures and detailed description. The scope of the invention is not limited to the following expressions.
FIG. 1 is a schematic diagram of a cable census instrument.
Fig. 2 is a schematic diagram of the waveform of the laser emission signal in the interference mode after tapping.
Fig. 3 is a schematic diagram of a specific embodiment.
Detailed Description
The invention comprises the following steps: step 1, measuring the length m of the optical cable breakpoint distance test point by using OTDR.
Step 2, knowing that the twisting percentage of the optical cable is X, and according to a formula M = M/(X + 1); wherein M represents the actual calibration length of the photoelectric breakpoint distance test point; and calculating the actual calibration length M of the optical cable breakpoint distance test point.
And 3, finding out the length position of the test breakpoint on site according to the actual calibration length M to finish coarse positioning.
Step 4, knocking the optical cable with the break point at the test break point position, and testing at the test point by using an optical cable general inspection instrument, wherein if a test signal exists at the knock position, the optical cable break point is not detected, and continuously inspecting in the extending direction; if no test signal exists at the knocking part, continuously checking towards the direction of the test point; and performing fine positioning.
And 5, until the breakpoint is found.
Further, in step 1, the length m of the optical cable breakpoint distance test point is measured in the test room or the interval test point by using the OTDR.
Further, the unit of the length m of the optical cable breakpoint distance test point is meter.
Further, the unit of the actual length M of the photoelectric breakpoint to the test point is meter.
Furthermore, in step 3, the length position of the test breakpoint is searched on site by integrating several types and factors of the optical cable breakpoint in the trench, the direct-buried optical cable breakpoint or the aerial optical cable breakpoint.
The working principle is as follows: as shown in fig. 1, the cable prover combines the rayleigh scattering technology with Sagnac effect to convert the vibration signal of the optical cable into the visual signal and the audio signal by coherent demodulation of light, and accurately search and identify the optical cable.
As shown in fig. 2, in a steady state, the interference mode of the signal emitted by the laser does not change, and once the optical cable is knocked, the refractive index of the knocked optical cable area is instantaneously changed according to the elastic effect, so that the phase of the polarization of light is changed, the interference mode is changed, and the display waveform is also changed correspondingly.
The specific embodiment is as follows, as shown in fig. 3.
1) After the optical cable is found to have a breakpoint, corresponding tools such as ODTR (optical fiber logging device), an optical cable general-survey instrument and the like are prepared and the optical cable reaches a specific nearest test point or a test machine room.
2) After finding out the optical cable core wire of the breakpoint, if the end is formed, the connection tail fiber tests the breakpoint distance A by using OTDR; if not, the breakpoint distance A is tested by using a V-shaped groove to butt the core wire.
3) The test optical cable is connected with an optical cable general survey instrument, and field personnel hit the optical cable when reaching the test distance A.
4) If the optical cable general survey instrument has a knocking reaction, the point A is not close to the optical cable breakpoint, the knocking is continued to the extending direction until the optical cable signal has no knocking change point B, and the point B is the optical cable breakpoint.
5) If the optical cable general survey instrument does not have a knocking reaction, the point A is shown to exceed the optical cable breakpoint, and the point A is knocked towards the direction of the test point until the optical cable signal knocking change point C occurs, wherein the point C is the optical cable breakpoint.
It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (5)
1. The method for searching the optical cable breakpoint by using the acoustic principle is characterized by comprising the following steps of:
step 1, measuring the length m of a breakpoint distance test point of an optical cable by using an OTDR (optical time Domain reflectometer);
step 2, knowing that the twisting percentage of the optical cable is X, and according to a formula M = M/(X + 1); wherein M represents the actual calibration length of the photoelectric breakpoint distance test point; calculating the actual calibration length M of the optical cable breakpoint distance test point;
step 3, finding out the length position of the test breakpoint on site according to the actual calibration length M to complete coarse positioning;
step 4, knocking the optical cable with the break point at the test break point position, and testing at the test point by using an optical cable general inspection instrument, wherein if a test signal exists at the knock position, the optical cable break point is not detected, and continuously inspecting in the extending direction; if no test signal exists at the knocking part, continuously checking towards the direction of the test point; fine positioning is carried out;
and 5, until the breakpoint is found.
2. The method for finding a breakpoint of an optical cable according to claim 1, wherein: in step 1, measuring the length m of the optical cable breakpoint distance test point in a test room or an interval test point by using OTDR.
3. The method for finding a breakpoint of an optical cable according to claim 1, wherein: the unit of the length m of the optical cable breakpoint distance test point is meter.
4. The method for finding a breakpoint of an optical cable according to claim 1, wherein: the unit of the actual length M of the photoelectric breakpoint to the test point is meter.
5. The method for finding a breakpoint of an optical cable according to claim 1, wherein: in step 3, the length position of the test breakpoint is searched on site by integrating several types and factors of the optical cable breakpoint in the trench, the direct-buried optical cable breakpoint or the aerial optical cable breakpoint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010396577.4A CN111504607A (en) | 2020-05-12 | 2020-05-12 | Method for searching optical cable breakpoint by using acoustic principle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010396577.4A CN111504607A (en) | 2020-05-12 | 2020-05-12 | Method for searching optical cable breakpoint by using acoustic principle |
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| CN111504607A true CN111504607A (en) | 2020-08-07 |
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| CN202010396577.4A Pending CN111504607A (en) | 2020-05-12 | 2020-05-12 | Method for searching optical cable breakpoint by using acoustic principle |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375981A (en) * | 2015-10-09 | 2016-03-02 | 武汉光谷互连科技有限公司 | An optical cable general locating system and method |
| CN107888286A (en) * | 2017-12-08 | 2018-04-06 | 河南宏博测控技术有限公司 | A kind of Cable's Fault point detecting method |
| CN109120335A (en) * | 2018-09-26 | 2019-01-01 | 昆仑杰信（北京）科技有限责任公司 | A kind of buried cable failure terrestrial positioning instrument and localization method |
| CN110011728A (en) * | 2019-05-24 | 2019-07-12 | 昆仑杰信（北京）科技有限责任公司 | Buried cable fault locating system of the breaking point detection in conjunction with vibration detection |
-
2020
- 2020-05-12 CN CN202010396577.4A patent/CN111504607A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375981A (en) * | 2015-10-09 | 2016-03-02 | 武汉光谷互连科技有限公司 | An optical cable general locating system and method |
| CN107888286A (en) * | 2017-12-08 | 2018-04-06 | 河南宏博测控技术有限公司 | A kind of Cable's Fault point detecting method |
| CN109120335A (en) * | 2018-09-26 | 2019-01-01 | 昆仑杰信（北京）科技有限责任公司 | A kind of buried cable failure terrestrial positioning instrument and localization method |
| CN110011728A (en) * | 2019-05-24 | 2019-07-12 | 昆仑杰信（北京）科技有限责任公司 | Buried cable fault locating system of the breaking point detection in conjunction with vibration detection |
Non-Patent Citations (1)
| Title |
|---|
| 郭中华: "利用光时域反射仪对光缆故障点准确定位及其测试误差分析", 《宁夏工程技术》 * |
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Application publication date: 20200807 |