CN110518970A - A kind of uniaxial optical fibers interferometer and the positioning device for eliminating fiber-optic vibration blind area - Google Patents
A kind of uniaxial optical fibers interferometer and the positioning device for eliminating fiber-optic vibration blind area Download PDFInfo
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- CN110518970A CN110518970A CN201910885691.0A CN201910885691A CN110518970A CN 110518970 A CN110518970 A CN 110518970A CN 201910885691 A CN201910885691 A CN 201910885691A CN 110518970 A CN110518970 A CN 110518970A
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- 230000008030 elimination Effects 0.000 abstract description 6
- 238000003379 elimination reaction Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 description 22
- 238000000253 optical time-domain reflectometry Methods 0.000 description 10
- 238000001514 detection method Methods 0.000 description 7
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
- H04B10/0771—Fault location on the transmission path
Abstract
The invention discloses a kind of uniaxial optical fibers interferometer and the positioning devices of elimination fiber-optic vibration blind area.Uniaxial optical fibers interferometer includes: the first optical splitter, the first fiber delay line, the second fiber delay line, short fiber, the second optical splitter and still used fiber delay line is the selection switch of the first fiber delay line the second fiber delay line of series connection for selecting used fiber delay line for the first fiber delay line, and gives the connection relationship between each component.The present invention also provides a kind of positioning devices that fiber-optic vibration blind area is eliminated using uniaxial optical fibers interferometer.Uniaxial optical fibers interferometer provided by the invention and the positioning device for eliminating fiber-optic vibration blind area, the influence that fiber-optic vibration blind area positions fiber-optic vibration caused by capable of eliminating because of Fresnel reflection, the accuracy of fiber-optic vibration positioning is improved, and has the characteristics that structure is simply and low in cost.
Description
Technical field
The present invention relates to optic communication test and technical field of optical fiber sensing, more particularly to a kind of uniaxial optical fibers interferometer and
Eliminate the positioning device of fiber-optic vibration blind area.
Background technique
When safeguarding fiber optic network, in addition to optical time domain reflectometer (OTDR), there are also fiber failure trackers for common instrument.Light
Time-domain reflectomer can measure the fiber lengths of fiber failure point, and fiber failure tracker can measure the optical fiber of optical fiber disturbance point
Length can relatively accurately estimate fiber failure point by the difference of analysis optical fiber disturbance point and the fiber lengths of fiber failure point
Geographical location.
Different according to the perturbation scheme to optical fiber, current fiber failure tracker is mainly based upon following several principles:
Polarization-optical time domain reflectometer (P-OTDR) detection optical fiber bending change, to progress Distance positioning (Chinese patent at curved fiber
A kind of pair of pinpoint method of fiber failure point of CN201410662192.2)；Use Brillouin-optical time domain reflectometer (B-
OTDR) or Raman-optical time domain reflectometer (R-OTDR) detection optical fiber temperature, to carrying out Distance positioning at optical fiber heating；Use phase
The vibration of position-optical time domain reflectometer (Φ-OTDR) detection optical fiber carries out Distance positioning to tapping at optical fiber；Using uniaxial Sagnac
Fibre optic interferometer adds the differential phase-OTDR detection optical fiber of OTDR to vibrate, and Distance positioning (United States Patent (USP) is carried out at optical fiber to tapping
US20070264012A1-Identifying or Locating Waveguides)。
Exact position positioning is carried out to fiber failure using the mode of P-OTDR detection optical fiber bending change, the disadvantage is that requiring
The bending of diameter 1m or so can be carried out to optical fiber.If optical fiber is laid tighter, the optical fiber that can not take out sufficient length is used for
Bending, then implement fibre-optical bending with regard to relatively difficult, by using P-OTDR detection curved fiber mode to fiber failure into
The positioning of row exact position also just becomes to be inconvenient.Optical fiber disturbance point is carried out using B-OTDR, R-OTDR or Φ-OTDR accurate
Position positioning, primary disadvantage is that the cost of B-OTDR, R-OTDR or Φ-OTDR are too high.
Add the differential phase-OTDR of OTDR to put optical fiber disturbance (vibration) using uniaxial Sagnac fibre optic interferometer and carries out essence
True position positioning, moderate cost, and it is easy to operate.But in a fiber, exist because the factors such as connector, breakpoint, end face are drawn
The Fresnel reflection risen, for the Rayleigh scattering signal that is generated compared with optical fiber of optical signal that Fresnel reflection generates, intensity height number
A magnitude, it is luxuriant and rich with fragrance in place of Fresnel reflection occurs when the vibration position in detection fiber is removed in the light pulse using musec order
Alunite ear reflex signal may mask Rayleigh scattering signal completely, thus generate one to hundreds of meters blind area.It deposits this blind area
Seriously affecting the location accuracy to fiber-optic vibration position.Therefore, in the use differential phase-OTDR to fiber-optic vibration position
It sets when being accurately positioned, fiber-optic vibration blind location area caused by needing to solve the problems, such as because of optical fiber Fresnel reflection.
Summary of the invention
The object of the present invention is to provide a kind of uniaxial optical fibers interferometer and the positioning devices of elimination fiber-optic vibration blind area, can
The influence that fiber-optic vibration blind area positions fiber-optic vibration caused by eliminating because of Fresnel reaction improves the accurate of fiber-optic vibration positioning
Degree, and have the characteristics that structure is simply and low in cost.
To achieve the above object, the present invention provides following schemes:
A kind of uniaxial optical fibers interferometer, comprising: the first optical splitter, the first fiber delay line, the second fiber delay line, short
Optical fiber, the second optical splitter and be first fiber delay line or described for fiber delay line used in selecting
One fiber delay line connect second fiber delay line selection switch；
The output end of first optical splitter is connect with one end of first fiber delay line；
The other end of first fiber delay line is connect with the first input end of the selection switch；
Second input terminal of the selection switch and the second output terminal of the selection switch are prolonged by second optical fiber
When line connect；
First output end of the selection switch is connect with the input terminal of second optical splitter；
The input terminal of second optical splitter is connect with the output end of first optical splitter by a short fiber.
Optionally, described to select switch for 2x2 photoswitch.
Optionally, the length range of the length range of first optical-fibre delay line and second optical-fibre delay line is
500m~20km.
Optionally, first optical splitter is the 2x2 optical splitter that splitting ratio is 50 to 50；Second optical splitter
The 1x2 optical splitter for being 50 to 50 for splitting ratio.
A kind of positioning device for eliminating fiber-optic vibration blind area, comprising: above-mentioned uniaxial optical fibers interferometer and optical pulse transmitter,
Light pulse receiver；
The input terminal of the first optical splitter in the output end of the optical pulse transmitter and the uniaxial optical fibers interferometer
Connection；
The output end of the first optical splitter in the input terminal of the light pulse receiver and the uniaxial optical fibers interferometer
Connection；
The output end of the uniaxial optical fibers interferometer is connect with tested optical fiber.
Optionally, the length value of the second optical-fibre delay line in the uniaxial optical fibers interferometer is sent out greater than the light pulse
/ 5th of the width numerical value for the light pulse that the machine of penetrating is emitted.
Optionally, the range of the light impulse length value of the optical pulse transmitter is 50ns~5000ns.
Optionally, the periodic regime of the optical pulse transmitter transmitting light pulse is 0.1ms-2ms.
The specific embodiment provided according to the present invention, the invention discloses following technical effects: single shaft provided by the invention
Fibre optic interferometer selects the length of fiber delay line by using selection switch, relatively simple for structure, and only logical
The length of change fiber delay line is crossed to measure, operating cost is lower.And it is based on this uniaxial optical fibers interferometer, right
During fiber-optic vibration position is positioned, when section passes through the selected fiber delay line of selection switch in different times
When length difference, the position of fiber-optic vibration measurement blind area caused by Fresnel reflection point is also different in tested optical fiber, therefore different
In measuring section when measurement fiber-optic vibration, measured blind zone position is different, then by measuring in different time sections
Result screened and calculated, so that it may it is fixed to cause due to eliminate the fiber-optic vibration measurement blind area caused by Fresnel reflection effect
The inaccurate influence in position.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of uniaxial optical fibers of embodiment of the present invention interferometer；
Fig. 2 is the structural schematic diagram that the embodiment of the present invention eliminates fiber-optic vibration blind location area device；
Fig. 3 is using fiber-optic vibration location data curve graph acquired in the prior art；
Fig. 4 is the data graphs using fiber-optic vibration blind location area acquired in the prior art；
Fig. 5 is using fiber-optic vibration location data acquired in elimination fiber-optic vibration blind location area device provided by the invention
Curve graph.
Appended drawing reference: 1- uniaxial optical fibers interferometer, the first optical splitter of 11-, the first fiber delay line of 12-, the second light of 13-
Fine delay line, 14- short fiber, the second optical splitter of 15-, 16- selection switch, 2- optical pulse transmitter, 3- light pulse receiver,
4- tested optical fiber.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of uniaxial optical fibers interferometer and the positioning devices of elimination fiber-optic vibration blind area, can
The influence that fiber-optic vibration blind area positions fiber-optic vibration caused by eliminating because of Fresnel reaction improves the accurate of fiber-optic vibration positioning
Degree, and have the characteristics that structure is simply and low in cost.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is the structural schematic diagram of uniaxial optical fibers of embodiment of the present invention interferometer, as shown in Figure 1, a kind of uniaxial optical fibers are dry
Interferometer, comprising: the first optical splitter 11, the first fiber delay line 12, the second fiber delay line 13, short fiber 14, the second light point
Road device 15 and be that first fiber delay line 12 or first optical fiber prolong for fiber delay line used in selecting
When line 12 connect the selection switch 16 of upper second fiber delay line 13；
The output end of first optical splitter 11 is connect with one end of first fiber delay line 12；
The other end of first fiber delay line 12 is connect with the first input end of the selection switch 16；
The second output terminal of second input terminal of the selection switch 16 and the selection switch 16 passes through second light
Fine delay line 13 connects；
First output end of the selection switch 16 is connect with the input terminal of second optical splitter 15；
The output end of the input terminal of second optical splitter 15 and first optical splitter 11 passes through a short fiber 14
Connection.
Wherein, used in the present invention to select switch 16 for 2x2 photoswitch.
The length range of the length range of first optical-fibre delay line and second optical-fibre delay line be 500m~
20km。
First optical splitter 11 is the 2x2 optical splitter that splitting ratio is 50 to 50；Second optical splitter 15 is
The 1x2 optical splitter that splitting ratio is 50 to 50.
As shown in Fig. 2, the present invention also provides a kind of positioning devices for eliminating fiber-optic vibration blind area.Described device includes:
Above-mentioned uniaxial optical fibers interferometer 11 and optical pulse transmitter 2, light pulse receiver 3；
The output end of the optical pulse transmitter 2 is defeated with the first optical splitter 11 in the uniaxial optical fibers interferometer 1
Enter end connection；
The input terminal of the light pulse receiver 3 is defeated with the first optical splitter 11 in the uniaxial optical fibers interferometer 1
Outlet connection；
The output end of the uniaxial optical fibers interferometer 1 is connect with tested optical fiber 4.
The length value (unit is rice) of the second optical-fibre delay line in the uniaxial optical fibers interferometer 1 is greater than the smooth arteries and veins
It rushes 1/5th of the width numerical value (unit is nanosecond) for the light pulse that transmitter 2 is emitted wherein, is only between the two numerical value
Association numerically is unrelated with numerical value unit used by the two.
The range of the light impulse length value of the optical pulse transmitter 2 is 50ns~5000ns.The optical pulse transmitter 2
The periodic regime for emitting light pulse is 0.1ms-2ms.
In the apparatus of the present, light source type used by optical pulse transmitter 2 is F-P LD or SLD, operation wavelength
For the C-band of 1310nm wave band, 1490 wave bands or 1550nm, the L-band of 1550nm and any one among 1625nm wave band.
Its operation wavelength is preferably the C-band of 1550nm.
The detector that light pulse receiver 3 uses is APD or PIN.
The specific works of fiber-optic vibration positioning are carried out using elimination fiber-optic vibration blind location area device provided by the present invention
Principle is:
During being positioned to fiber-optic vibration position, in order to avoid the influence of fiber-optic vibration blind area bring, in light
After pulse transmitter 2 generates light pulse signal, after generated light pulse signal is transferred to uniaxial optical fibers interferometer 1, enter
Tested optical fiber 4.Backscatter signal and reflection signal in tested optical fiber 4 enter back into Guang Mai after entering uniaxial optical fibers interferometer 1
Rush receiver 3.
During the positioning of entire fiber-optic vibration, (first choice switch and the second selection switch) is switched by selection,
The fiber delay line (the first fiber delay line or the second fiber delay line) of different length is selected in different measuring sections；When
When the fiber delay time line length difference of uniaxial optical fibers interferometer, fiber-optic vibration caused by Fresnel reflection point is measured in tested optical fiber
Blind zone position is different, therefore in different measuring sections when measurement fiber-optic vibration, the position of measurement blind area is also different.When two light
The length difference of fine delay line is sufficiently large, and measurement blind area would not be overlapped；It is carried out to measuring to obtain result in two periods
After screening, calculating, so that it may eliminate the fiber-optic vibration measurement blind area caused by Fresnel reflection effect due to cause positioning inaccurate
Influence.
And use the concrete operations of measurement blind area caused by device provided by the present invention elimination optical fiber Fresnel reflection
Journey are as follows:
The time of one-shot measurement is divided into two periods, and guarantees that the mode of taken percussion optical fiber can make optical fiber
It is all vibrated more than once in every section of time of measuring；
In first measuring section, the first fiber delay line is accessed uniaxial optical fibers interferometer by control selections switch
In；After optical pulse transmitter emits light pulse signal every time, 1 frame optical fiber back scattering and backward anti-is obtained by light pulse receiver
Penetrate signal data DK1；The adjacent data of two frames are subtracted each other, it may be assumed that Δ DK1=DK1+1-DK1；Display signal number is carried out with curve mode
According to sequence Δ DK1, the variation of Y-axis expression backscatter signal amplitude, X-axis expression fiber lengths；Since coordinate origin, forward
Point-by-point displacement meter calculates data sequence Δ DK1, as signal data sequence Δ DK1In Y value occur be greater than setting threshold value Yt1When, note
The point on lower curve is recorded, is displaced, calculated point by point from the point toward coordinate origin direction, when the curve of certain point on curve is oblique
When rate begins to change into negative value (or zero) by positive value, which corresponds to fiber-optic vibration position, and the value of the X-axis of the point subtracts first light
The half of fine delay line length value, obtained value S1For the optical fiber optical length value of fiber-optic vibration position to measuring device；
In second measuring section, the second fiber delay line is accessed uniaxial optical fibers interferometer by control selections switch
In；After optical pulse transmitter emits light pulse signal every time, 1 frame optical fiber back scattering and backward anti-is obtained by light pulse receiver
Penetrate signal data DK2；The adjacent data of two frames are subtracted each other, it may be assumed that Δ DK2=DK2+1-DK；Display signal data is carried out with curve mode
Sequence Δ DK2, the variation of Y-axis expression backscatter signal amplitude, X-axis expression fiber lengths；Since coordinate origin, forward by
Point displacement calculates data sequence Δ DK2, as signal data sequence Δ DK2In Y value occur be greater than setting threshold value Yt2When, record
The point on lower curve, is displaced from the point toward coordinate origin direction, is calculated, point by point when the slope of curve of certain point on curve
When beginning to change into negative value (or zero) by positive value, which corresponds to fiber-optic vibration position, and the value of the X-axis of the point subtracts the second optical fiber and prolongs
When wire length angle value half, obtained value S2For the optical fiber optical length value of fiber-optic vibration position to measuring device；
Compare S1And S2Size, the small value of numerical value is final fiber-optic vibration position prolonging to measuring device among the two
When optical fiber length value.
The time of measuring of measuring section is 1s~180s, preferably 10s twice.The threshold value Y of settingt1With the threshold value of setting
Yt2Value range is 0.05~0.2dB.
In addition, further combined with test data curve come the advantages of verifying device provided by the present invention, it is specific as follows:
Fig. 3 is two after the OTDR data frame signal carried out using the uniaxial optical fibers interferometer provided in the prior art is subtracted each other
Group data, series 1 are data groups when not vibrating on optical fiber, and series 2 is data group when having vibration on optical fiber.From series 2
Data group can also learn vibration occur position at a point, the end of tested optical fiber is at e point.
If the end of tested optical fiber is more smooth, stronger Fresnel reflection will be generated, reflectivity may be up to -15dB,
And the scattered power of optical fiber then only has -50dB or so (1550nm wavelength, 1 microsecond of light impulse length), optical signal level differs
35dB.For the amplifier of light pulse receiver, for the scattered signal of normally reception optical fiber, certain increasing is needed
Benefit, when receiving stronger Fresnel reflection signal, amplifying circuit will go into saturation state.Enter saturation state in circuit
Period, the signal value obtained through A/D circuit will not generate variation, it is meant that be measurement blind area during signal saturation.
It is the single fiber line of time delay in the case where there is stronger Fresnel reflection in the end of tested optical fiber shown in Fig. 4
The differential phase-OTDR acquired in data.As can be seen that numerical value is 0 in b point to c point.If a point in position occurs for vibration
Unfortunately b point is fallen between c point, although still may determine that there is vibration on optical fiber at this time, will be unable to determine a point
The exact value of position.
And device provided by the present invention is used to carry out in the first measurement period of fiber-optic vibration position, vibrate location data
Curve is as shown in the series 1 in Fig. 5；In the second measurement period, location data curve is vibrated as shown in the series 2 in Fig. 5.System
The measurement blind area of 1 curve of column is b-c, and the measurement blind area of serial 2 curves is b'-c', and the region b-c and the region b'-c' are not overlapped.Cause
If this fiber-optic vibration point a falls into the region b-c, that would not fall into the region b'-c'；, whereas if fiber-optic vibration point a is fallen into
The region b'-c', that would not fall into the region b-c.Therefore, the measurement result of the first measurement period and the second measurement period is carried out
Merge, after screening, finally obtained fiber-optic vibration point position measurements are not by the shadow of Fresnel reflection present in optical fiber
It rings.
Uniaxial optical fibers interferometer provided by the invention selects the length of fiber delay line by using selection switch
It selects, it is relatively simple for structure, and measured simply by the length for changing fiber delay line, operating cost is lower.And it is based on
This uniaxial optical fibers interferometer, during being positioned to fiber-optic vibration position, when section passes through selection in different times
When switching the length difference of selected fiber delay line, the measurement of fiber-optic vibration caused by Fresnel reflection point is blind in tested optical fiber
The position in area is also different, therefore in different measuring sections when measurement fiber-optic vibration, measured blind zone position is different, then
By the way that the result measured in different time sections is screened and is calculated, so that it may light caused by eliminating because of Fresnel reflection effect
Fine vibration measurement blind area and cause to position inaccurate influence.
And in the positioning device provided by the invention for eliminating fiber-optic vibration blind area, using above-mentioned uniaxial optical fibers interferometer
It can be formed by the differential phase-OTDR, so that during being positioned to fiber-optic vibration position, just using lesser cost
It can eliminate and eliminate the fiber-optic vibration measurement blind area caused by Fresnel reflection effect due to cause to position inaccurate influence, in turn
Improve the accuracy of fiber-optic vibration position positioning.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (8)
1. a kind of uniaxial optical fibers interferometer characterized by comprising the first optical splitter, the first fiber delay line, the second optical fiber
Delay line, short fiber, the second optical splitter and be first fiber delay line for fiber delay line used in selecting
Or first fiber delay line connect second fiber delay line selection switch；
The output end of first optical splitter is connect with one end of first fiber delay line；
The other end of first fiber delay line is connect with the first input end of the selection switch；
The second output terminal of second input terminal of the selection switch and the selection switch passes through second fiber delay line
Connection；
First output end of the selection switch is connect with the input terminal of second optical splitter；
The input terminal of second optical splitter is connect with the output end of first optical splitter by a short fiber.
2. a kind of uniaxial optical fibers interferometer according to claim 1, which is characterized in that described that switch is selected to open for 2x2 light
It closes.
3. a kind of uniaxial optical fibers interferometer according to claim 1, which is characterized in that the length of first optical-fibre delay line
The length range for spending range and second optical-fibre delay line is 500m~20km.
4. a kind of uniaxial optical fibers interferometer according to claim 1, which is characterized in that first optical splitter is light splitting
Than the 2x2 optical splitter for 50 to 50；Second optical splitter is the 1x2 optical splitter that splitting ratio is 50 to 50.
5. a kind of positioning device for eliminating fiber-optic vibration blind area characterized by comprising such as claim 1-4 any one institute
Uniaxial optical fibers interferometer and optical pulse transmitter, the light pulse receiver stated；
The output end of the optical pulse transmitter is connect with the input terminal of the first optical splitter in the uniaxial optical fibers interferometer；
The input terminal of the light pulse receiver is connect with the output end of the first optical splitter in the uniaxial optical fibers interferometer；
The output end of the uniaxial optical fibers interferometer is connect with tested optical fiber.
6. a kind of positioning device for eliminating fiber-optic vibration blind area according to claim 5, which is characterized in that the single shaft light
The length value of the second optical-fibre delay line in fine interferometer is greater than the width for the light pulse that the optical pulse transmitter is emitted
/ 5th of numerical value.
7. a kind of positioning device for eliminating fiber-optic vibration blind area according to claim 6, which is characterized in that the light pulse
The range of the light impulse length value of transmitter is 50ns~5000ns.
8. a kind of positioning device for eliminating fiber-optic vibration blind area according to claim 5, which is characterized in that the light pulse
The periodic regime that transmitter emits light pulse is 0.1ms-2ms.
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| CN1635339A (en) * | 2005-01-01 | 2005-07-06 | 复旦大学 | Full optical fiber positioning and monitoring method and system therefor |
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