CN105784324A - Optical fiber breakpoint position detection method, device and system - Google Patents
Optical fiber breakpoint position detection method, device and system Download PDFInfo
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- CN105784324A CN105784324A CN201610116117.5A CN201610116117A CN105784324A CN 105784324 A CN105784324 A CN 105784324A CN 201610116117 A CN201610116117 A CN 201610116117A CN 105784324 A CN105784324 A CN 105784324A
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- 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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Abstract
The invention discloses an optical fiber breakpoint position detection method, device and system. The method comprises the steps of: sampling optical fiber electrical signals to obtain a plurality of signal values and corresponding sampling time when the optical fiber electrical signal is obtained, wherein the optical fiber electrical signals are converted from optical signals reflected by the optical fiber; determining first sampling time corresponding to the signal value less than a first threshold; when the signal value corresponding to second sampling time before and adjacent to the first sampling time is larger than a second threshold, calculating a distance between an optical fiber breakpoint and an optical fiber tail end according to the second sampling time so as to determine the position of the optical fiber breakpoint. By means of the above mode, the precision and the efficiency of optical fiber breakpoint detection can be improved.
Description
Technical field
The present invention relates to fiber optic communication field, particularly relate to a kind of breakpoints of optical fiber method for detecting position, Apparatus and system.
Background technology
Optical fiber is fibre-optic writing a Chinese character in simplified form, and is a kind of fiber being made up of glass or plastics, can conduct instrument as light, and transmission principle is the total reflection of light.Which floor most optical fiber must protect structure to be coated with before use by, and namely the cable after cladding is referred to as optical cable.
In the use procedure of optical fiber, aging along with equipment, or optical fibre damage, cable protection layer damage, install the reasons such as the Pipeline damage of optical cable, to making optical fiber, disconnected fine situation occurs.Owing to the length of optical fiber is long, installation environment is complicated, the determination to breakpoints of optical fiber position is a difficult problem.
Generally, being by passing into test optical signal to optical fiber connector, each point in optical fiber can produce Rayleigh scattering, is not used in the feature of other position scattered signals according to the scattered signal of breakpoint location, it may be determined that breakpoints of optical fiber position.In this approach, due to affected by noise in test, in optical fiber, the Rayleigh scattering power of certain point is a stochastic process.Simultaneously, owing to back-scattering light signal is extremely faint, know the scattered signal of this point, it is generally adopted and repeatedly adds up the method averaged to improve signal to noise ratio, to reduce the impact of the intrinsic random noise of receptor, and, for long optical fiber, ask employing repeatedly to add up the method averaged and can consume the substantial amounts of time.Therefore, this method measuring accuracy is low, and the testing time is long.
Summary of the invention
The technical problem that present invention mainly solves is to provide a kind of breakpoints of optical fiber method for detecting position, Apparatus and system, it is possible to increase the precision of breakpoints of optical fiber detection and efficiency.
For solving above-mentioned technical problem, the technical scheme that the present invention adopts is: provide a kind of breakpoints of optical fiber method for detecting position, the method includes: when getting fiber optic telecommunications, and fiber optic telecommunications number is sampled, to obtain the sampling time of several signal values and correspondence；Wherein, fiber optic telecommunications number is to be converted to by the optical signal of fiber reflection；Determine first sampling time corresponding less than a signal value of first threshold；And the signal value that adjacent the second sampling time is corresponding before the first sampling time more than Second Threshold time, calculate the distance between breakpoints of optical fiber place and optical fiber connector according to the second sampling time, to determine the position of breakpoints of optical fiber.
Wherein, calculate the distance between breakpoints of optical fiber place and optical fiber connector according to the second sampling time, specifically include: calculate the distance between breakpoints of optical fiber place and optical fiber connector according to formula L=(c*T/n)/2；Wherein, c is light speed in a vacuum, and T was the second sampling time, and n is the refractive index of optical fiber.
Wherein, sampling period fiber optic telecommunications number sampled is 10ns.
Wherein, fiber optic telecommunications number is digital electric signal；Wherein, digital electric signal is converted by analog electrical signal and obtains, and analog electrical signal is to be converted to by the optical signal of fiber reflection.
Wherein, when signal value corresponding to the second sampling time adjacent before the first sampling time is more than Second Threshold, the distance between breakpoints of optical fiber place and optical fiber connector is calculated according to the second sampling time, specifically include: signal value that the second sampling time adjacent before the first sampling time the is corresponding and when meansigma methods of the signal value that continuous print multiple sampling time is corresponding is more than three threshold values before the second sampling time, calculate the distance between breakpoints of optical fiber place and optical fiber connector according to the second sampling time.
Wherein it is determined that first sampling time corresponding less than a signal value of first threshold, specifically include: determine the multiple signal values less than first threshold, and with the minimum time value of sampling time in multiple sampling times corresponding to multiple signal values for the first sampling time.
For solving above-mentioned technical problem, another technical solution used in the present invention is: provide a kind of breakpoints of optical fiber position detecting device, this device includes: sampling module, for when getting fiber optic telecommunications, fiber optic telecommunications number is sampled, to obtain the sampling time of several signal values and correspondence；Wherein, fiber optic telecommunications number is to be converted to by the optical signal of fiber reflection；Determine module, for determining first sampling time corresponding less than a signal value of first threshold；And for signal value corresponding to the second sampling time adjacent before the first sampling time more than Second Threshold time, calculate the distance between breakpoints of optical fiber place and optical fiber connector according to the second sampling time, to determine the position of breakpoints of optical fiber.
Wherein it is determined that module specifically for calculating the distance between breakpoints of optical fiber place and optical fiber connector according to formula L=(c*T/n)/2；Wherein, c is light speed in a vacuum, and T was the second sampling time, and n is the refractive index of optical fiber.
Wherein, fiber optic telecommunications number is digital electric signal；Wherein, digital electric signal is converted by analog electrical signal and obtains, and analog electrical signal is to be converted to by the optical signal of fiber reflection.
For solving above-mentioned technical problem, another technical solution used in the present invention is: provide a kind of breakpoints of optical fiber position detecting system, this system includes: signal receiving/transmission device, for inputting the first optical signal from optical fiber connector and obtaining the first optical signal and reflect the second optical signal obtained in a fiber；Photoelectric conversion device, for being converted into analog electrical signal by the second optical signal；Digiverter, for being converted into digital electric signal by analog electrical signal；Breakpoints of optical fiber position detecting device；Wherein, breakpoints of optical fiber position detecting device is breakpoints of optical fiber position detecting device as above.
The invention has the beneficial effects as follows: be different from the situation of prior art, the present invention can pass through the judgement of the first sampling time and second two signal values of sampling time, quickly the breakpoint location in optical fiber is positioned, adopt the mechanism of multiple judgement that the positioning precision of breakpoint location is improved simultaneously.
Accompanying drawing explanation
Fig. 1 is the flow chart of breakpoints of optical fiber method for detecting position the first embodiment of the present invention；
Fig. 2 is the schematic diagram of the second optical signal in breakpoints of optical fiber method for detecting position the first embodiment of the present invention；
Fig. 3 is the structural representation of breakpoints of optical fiber method for detecting position the first embodiment of the present invention；
Fig. 4 is the schematic diagram of the digital electric signal in breakpoints of optical fiber method for detecting position the first embodiment of the present invention after sampling；
Fig. 5 is the schematic diagram of the digital electric signal in breakpoints of optical fiber method for detecting position the second embodiment of the present invention after sampling；
Fig. 6 is the structural representation of breakpoints of optical fiber position detecting device one embodiment of the present invention；
Fig. 7 is the structural representation of breakpoints of optical fiber another embodiment of position detecting device of the present invention；
Fig. 8 is the structural representation of breakpoints of optical fiber position detecting system one embodiment of the present invention.
Detailed description of the invention
Consulting Fig. 1, the flow chart of breakpoints of optical fiber method for detecting position the first embodiment of the present invention, the method includes:
S11: when getting fiber optic telecommunications, samples to fiber optic telecommunications number, to obtain the sampling time of several signal values and correspondence；Wherein, fiber optic telecommunications number is to be converted to by the optical signal of fiber reflection.
Optionally, the optical signal of fiber reflection be from the first optical signal each position in a fiber that optical fiber connector passes into through Rayleigh scattering formed and the second optical signal of reflecting.
Optionally, fiber optic telecommunications number is digital electric signal；Wherein, digital electric signal is converted by analog electrical signal and obtains, and analog electrical signal is to be converted to by the optical signal of fiber reflection.Due to the optical signal of backscattering and faint, and its noise is smaller, and in the process to optical signal prosessing, difficulty is relatively big, precision is less, therefore converts optical signal into analog electrical signal and is easy to the process of signal.Here can be changed by general optical-electrical converter, for instance APD (AvalanchePhotoDiode, avalanche photodide) etc..
Optionally, analog electrical signal is converted to digital electric signal and can adopt analog-digital converter.
Optionally, the frequency of sampling arbitrarily can be arranged according to the precision of detection, the signal value of digital electric signal during to obtain time of each sampled point and this time.Optionally, sampling period digital electric signal sampled is 10ns.Understandable, just can analog electrical signal be converted to the discrete digital signal being spaced apart 10ns when analog electrical signal is converted to digital electric signal simultaneously, can also after converting digital signal to, then to digital signal samples, to form the digital electric signal that the cycle is 10ns.
Optionally, it is also possible to analog electrical signal is made directly sampling, and is not converted into digital electric signal, the cycle of sampling is it can also be provided that 10ns.
S12: determine first sampling time corresponding less than a signal value of first threshold.
Ruili scattering all can be produced due to from optical fiber connector to optical fiber end points, and the optical signal of scattering or scattering after end points place, will not be occurred less, therefore the signal value after end points place should be 0 or minimum, finds in practice, still have the signal of reflection after end points place, and signal value is less.Therefore, it can less than first threshold, breakpoints of optical fiber position carry out an anticipation according to signal value.
Optionally, first threshold here is an only small signal value, and its concrete numerical value is to determine according to many factors such as the optical signal passed into, optical fiber properties, is not limited as here.
Optionally, if while starting to receive the second optical signal of reflection, being just synchronously performed opto-electronic conversion and analog digital conversion, then can with first sampling time corresponding less than a signal value of first threshold detecting for the first sampling time.
Optionally, if carrying out opto-electronic conversion and analog digital conversion after signal has all received again, it is determined that less than multiple signal values of first threshold, and with the minimum time value of sampling time in multiple sampling times corresponding to multiple signal values for the first sampling time.
S13: when signal value corresponding to the second sampling time adjacent before the first sampling time is more than Second Threshold, calculates the distance between breakpoints of optical fiber place and optical fiber connector according to the second sampling time, to determine the position of breakpoints of optical fiber.
Owing to the first incident optical signal reflected energy at optical fiber end points place is relatively big, in therefore corresponding digital electric signal, the signal value at end points place is also just very big.Therefore, adopt this decision procedure, to determine the position of breakpoints of optical fiber.
Consult Fig. 2, the schematic diagram of the second optical signal in breakpoints of optical fiber method for detecting position the first embodiment of the present invention, wherein, abscissa T represents the time of the second optical signal of reception, vertical coordinate P represents light signal strength, i.e. the size of signal value, principle, above-mentioned S11-S13 is illustrated here:
0-t3 section: after the first optical signal passes into optical fiber, this the first optical signal can be carried out Rayleigh scattering backscattering by each point in optical fiber, namely major part signal energy keeps to front transfer, fraction signal energy is transmitted to opposite direction, owing to the distance of signal transmission is continuously increased, signal intensity constantly weakens.
T3-t2 section: in signal transmits, if running into breakpoint, signal cannot continue forward transmission, can only reflect to opposite direction, and therefore, signal intensity can increase suddenly.
T2-t1 section: in theory, the part after breakpoint does not have signal, but forms the variation of the reason of breakpoint due to breakpoint location; breakpoints of optical fiber is frequently not direct fracture, but fibre core, protective layer partial destruction, therefore; after t2, also tend to be able to detect that faint signal.
According to above-mentioned principle, in conjunction with S12 and S13, it is first determined the very first time t1 that signal intensity is faint, get rid of the distance after breakpoints of optical fiber；Judge the signal intensity of time t2 before t1 again, if the signal intensity of t2 is relatively big, then it can be assumed that t2 position is the breakpoint location of optical fiber.
Specifically, consult Fig. 3 and Fig. 4, Fig. 3 is the structural representation of breakpoints of optical fiber method for detecting position the first embodiment of the present invention, and Fig. 4 is the schematic diagram of the digital electric signal in breakpoints of optical fiber method for detecting position the first embodiment of the present invention after sampling, illustrates with a specific example below:
As it is shown on figure 3, light source (such as pulse laser) passes into the first optical signal from optical fiber connector, the first optical signal each position in a fiber all can be reflected, and receives, from optical fiber connector, the second optical signal that reflection obtains；Second optical signal is converted into the signal of telecommunication；The signal of telecommunication is sampled, to obtain the sampling time of several signal values and correspondence；The signal of telecommunication after sampling is as shown in Figure 4.
First determining the first sampling time t1 corresponding less than a signal value of first threshold, when having multiple less than a signal value of first threshold, the time value that the sampling time is minimum in multiple sampling times that multiple signal values are corresponding is for the first sampling time.
When adjacent second corresponding for sampling time t2 signal value is more than Second Threshold before the first sampling time t1, then may determine that the second corresponding for sampling time t2 position is breakpoints of optical fiber position.
The distance between breakpoints of optical fiber place and optical fiber connector is calculated, to determine the position of breakpoints of optical fiber finally according to the second sampling time t2.
Wherein, calculate the distance between breakpoints of optical fiber place and optical fiber connector according to the second sampling time, specifically include: calculate the distance between breakpoints of optical fiber place and optical fiber connector according to formula L=(c*T/n)/2；Wherein, c is light speed in a vacuum, and T is the second sampling time t2, n is the refractive index of optical fiber.
It should be noted that, also need to when calculating fiber lengths consider the optical fiber remaining length in optical cable, specifically it is referred to below equation: L1=(L-S)/(1+P), wherein, L is the distance that algorithm above records, and the unilateral dish that S is in cable splice closure stays length, generally takes 0.6-1.2m, P is the remaining length of this optical cable, different because cable configuration is different.
Optionally, S13 it may also is that
Signal value that the second sampling time adjacent before the first sampling time the is corresponding and when meansigma methods of the signal value that continuous print multiple sampling time is corresponding is more than Second Threshold before the second sampling time, calculates the distance between breakpoints of optical fiber place and optical fiber connector according to the second sampling time.
Referring particularly to Fig. 5, owing to the position of breakpoints of optical fiber is not likely to be an extremely short distance, namely it is likely to have the signal value that continuous several sampled point is corresponding both to be greater than a certain threshold value preset, and in these sampled points, the signal value maximum (signal value as corresponding in t3) of in the middle of often, and signal value corresponding for time t2 before time t 1 is likely to not reach default first threshold.
Adopt above method, multiple (such as 3 can be taken continuously before t1, t2, t3 and t4) signal value that sampled point is corresponding, averaged, judge that whether this meansigma methods is more than default first threshold, certainly, first threshold here can be identical with the first threshold of above-mentioned first embodiment, it is also possible to additionally resets a threshold value.
In this way, although determining that position corresponding for t2 is breakpoint location equally, but it is recognised that the multiple positions before t2 also there occurs breakpoint, and the degree being likely to breakpoint is more serious, when can avoid continuously breakpoint occurring, it is impossible to accurately detect the position that breakpoint is the most serious.
It is different from prior art, present embodiment can pass through the judgement of the first sampling time and second two signal values of sampling time, quickly the breakpoint location in optical fiber is positioned, adopt the mechanism of multiple judgement that the positioning precision of breakpoint location is improved simultaneously.
Consulting Fig. 6, the structural representation of breakpoints of optical fiber position detecting device one embodiment of the present invention, this device includes:
Sampling module 61, for when getting fiber optic telecommunications, sampling to fiber optic telecommunications number, to obtain the sampling time of several signal values and correspondence；Wherein, fiber optic telecommunications number is to be converted to by the optical signal of fiber reflection.
Determine module 62, for determining first sampling time corresponding less than a signal value of first threshold；And for signal value corresponding to the second sampling time adjacent before the first sampling time more than Second Threshold time, calculate the distance between breakpoints of optical fiber place and optical fiber connector according to the second sampling time, to determine the position of breakpoints of optical fiber.
Optionally, fiber optic telecommunications number is digital electric signal；Wherein, digital electric signal is converted by analog electrical signal and obtains, and analog electrical signal is to be converted to by the optical signal of fiber reflection.
Optionally, it is determined that module 62 specifically for calculating the distance between breakpoints of optical fiber place and optical fiber connector according to formula L=(c*T/n)/2；Wherein, c is light speed in a vacuum, and T was the second sampling time, and n is the refractive index of optical fiber.
Optionally, determine that module 62 is specifically for signal value corresponding to the second sampling time adjacent before the first sampling time with when the meansigma methods of the signal value that continuous print multiple sampling time is corresponding is more than Second Threshold before the second sampling time, calculates the distance between breakpoints of optical fiber place and optical fiber connector according to the second sampling time.
Optionally, it is determined that module 62 is specifically for determining the multiple signal values less than first threshold, and with the minimum time value of sampling time in multiple sampling times corresponding to multiple signal values for the first sampling time.
Consulting Fig. 7, the structural representation of breakpoints of optical fiber another embodiment of position detecting device of the present invention, this device 70 includes processor 71, memorizer 72, input equipment 73 and output device 74.Wherein, processor 71, memorizer 72, input equipment 73 and output device 74 may each be one or more, and only for one in Fig. 7, they can be connected by bus.
Memorizer 72 is used for storing system program, operation program or some necessary datas etc..
Input equipment 73 is used for obtaining fiber optic telecommunications number.Wherein, fiber optic telecommunications number is to be converted to by the optical signal of fiber reflection
Processor 71 is for sampling to fiber optic telecommunications number, to obtain the sampling time of several signal values and correspondence.
Processor 71 is for determining first sampling time corresponding less than a signal value of first threshold；And for signal value corresponding to the second sampling time adjacent before the first sampling time more than Second Threshold time, calculate the distance between breakpoints of optical fiber place and optical fiber connector according to the second sampling time, to determine the position of breakpoints of optical fiber.
In several embodiments provided by the present invention, it should be understood that disclosed method and device, it is possible to realize by another way.Such as, device embodiments described above is merely schematic, such as, the division of described module or unit, being only a kind of logic function to divide, actual can have other dividing mode when realizing, for instance multiple unit or assembly can in conjunction with or be desirably integrated into another system, or some features can ignore, or do not perform.
The described unit illustrated as separating component can be or may not be physically separate, and the parts shown as unit can be or may not be physical location, namely may be located at a place, or can also be distributed on multiple NE.Some or all of unit therein can be selected according to the actual needs to realize the purpose of present embodiment scheme.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it is also possible to be that unit is individually physically present, it is also possible to two or more unit are integrated in a unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, it would however also be possible to employ the form of SFU software functional unit realizes.
If the integrated unit in other embodiments above-mentioned is using the form realization of SFU software functional unit and as independent production marketing or use, it is possible to be stored in a computer read/write memory medium.Based on such understanding, part or all or part of of this technical scheme that prior art is contributed by technical scheme substantially in other words can embody with the form of software product, this computer software product is stored in a storage medium, including some instructions with so that a computer equipment (can be personal computer, server, or the network equipment etc.) or processor (processor) perform all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory (ROM, Read-OnlyMemory), the various media that can store program code such as random access memory (RAM, RandomAccessMemory), magnetic disc or CD.
Consulting Fig. 8, the structural representation of breakpoints of optical fiber position detecting system one embodiment of the present invention, this system includes:
Signal receiving/transmission device 81, for inputting the first optical signal from optical fiber connector and obtaining the first optical signal and reflect the second optical signal obtained in a fiber.
Photoelectric conversion device 82, for being converted into analog electrical signal by the second optical signal.
Digiverter 83, for being converted into digital electric signal by analog electrical signal.
Breakpoints of optical fiber position detecting device 84；Wherein, it is as above breakpoints of optical fiber position detecting device described in each embodiment that 84 devices are detected in breakpoints of optical fiber position, and its embodiment is similar, repeats no more here.
The foregoing is only embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure utilizing description of the present invention and accompanying drawing content to make or equivalence flow process conversion; or directly or indirectly it is used in other relevant technical fields, all in like manner include in the scope of patent protection of the present invention.
Claims (10)
1. a breakpoints of optical fiber method for detecting position, it is characterised in that including:
When getting fiber optic telecommunications, described fiber optic telecommunications number is sampled, to obtain the sampling time of several signal values and correspondence；Wherein, described fiber optic telecommunications number is to be converted to by the optical signal of fiber reflection；
Determine first sampling time corresponding less than a signal value of first threshold；And
When signal value corresponding to the second sampling time adjacent before described first sampling time is more than Second Threshold, calculate the distance between breakpoints of optical fiber place and described optical fiber connector according to described second sampling time, to determine the position of described breakpoints of optical fiber.
2. method according to claim 1, it is characterised in that described calculate the distance between breakpoints of optical fiber place and described optical fiber connector according to described second sampling time, specifically includes:
The distance between breakpoints of optical fiber place and optical fiber connector is calculated according to formula L=(c*T/n)/2；Wherein, c is light speed in a vacuum, and T is described second sampling time, and n is the refractive index of described optical fiber.
3. method according to claim 2, it is characterised in that the described sampling period that described fiber optic telecommunications number is sampled is 10ns.
4. method according to claim 1, it is characterised in that described fiber optic telecommunications number is digital electric signal；
Wherein, described digital electric signal is converted by analog electrical signal and obtains, and described analog electrical signal is to be converted to by the optical signal of fiber reflection.
5. method according to claim 1, it is characterized in that, when signal value corresponding to the second sampling time adjacent before described first sampling time is more than Second Threshold, calculates the distance between breakpoints of optical fiber place and described optical fiber connector according to described second sampling time, specifically include:
When the meansigma methods of the signal value that signal value corresponding to the second sampling time adjacent before described first sampling time is corresponding with continuous print multiple sampling time before described second sampling time is more than three threshold values, calculate the distance between breakpoints of optical fiber place and described optical fiber connector according to described second sampling time.
6. method according to claim 1, it is characterised in that described determine first sampling time corresponding less than a signal value of first threshold, specifically includes:
Determine the multiple signal values less than first threshold, and with the minimum time value of sampling time in multiple sampling times corresponding to the plurality of signal value for the first sampling time.
7. a breakpoints of optical fiber position detecting device, it is characterised in that including:
Sampling module, for when getting fiber optic telecommunications, sampling to described fiber optic telecommunications number, to obtain the sampling time of several signal values and correspondence；Wherein, described fiber optic telecommunications number is to be converted to by the optical signal of fiber reflection；
Determine module, for determining first sampling time corresponding less than a signal value of first threshold；And
During for signal value corresponding to the second sampling time adjacent before described first sampling time more than Second Threshold, calculate the distance between breakpoints of optical fiber place and described optical fiber connector according to described second sampling time, to determine the position of described breakpoints of optical fiber.
8. device according to claim 7, it is characterised in that described determine the module distance specifically for calculating between breakpoints of optical fiber place and optical fiber connector according to formula L=(c*T/n)/2；Wherein, c is light speed in a vacuum, and T is described second sampling time, and n is the refractive index of described optical fiber.
9. method according to claim 7, it is characterised in that described fiber optic telecommunications number is digital electric signal；
Wherein, described digital electric signal is converted by analog electrical signal and obtains, and described analog electrical signal is to be converted to by the optical signal of fiber reflection.
10. a breakpoints of optical fiber position detecting system, it is characterised in that including:
Signal receiving/transmission device, for inputting the first optical signal from optical fiber connector and obtaining described first optical signal and reflect the second optical signal obtained described optical fiber；
Photoelectric conversion device, for being converted into analog electrical signal by described second optical signal；
Digiverter, for being converted into digital electric signal by described analog electrical signal；
Breakpoints of optical fiber position detecting device；Wherein, described breakpoints of optical fiber position detecting device is the breakpoints of optical fiber position detecting device as described in any one of claim 7-9.
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