CN106646754A - Device and method for eliminating end reflected light noise of fiber and optical cable - Google Patents
Device and method for eliminating end reflected light noise of fiber and optical cable Download PDFInfo
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- CN106646754A CN106646754A CN201611069992.9A CN201611069992A CN106646754A CN 106646754 A CN106646754 A CN 106646754A CN 201611069992 A CN201611069992 A CN 201611069992A CN 106646754 A CN106646754 A CN 106646754A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
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Abstract
The invention discloses a device and method for eliminating the end reflected light noise of a fiber and an optical cable. The device for eliminating the end reflected light noise of the fiber includes a light shielding cylinder having one closed end and a solid thermalized dual-component epoxy resin glue, after the light shielding cylinder is glued to the end of the fiber after being saturatedly and fully filled with the solid thermalized dual-component epoxy resin glue, the fiber is arranged on the end face in the light shielding cylinder, and the solid thermalized dual-component epoxy resin glue fills between the inner wall and the cylinder bottom of the light shielding cylinder. The device for eliminating the end reflected light noise of the optical cable includes the device for eliminating the end reflected light noise of the fiber and further includes a rapid bonding agent and a protective cover cylinder having one closed end, the protective cover cylinder is glued to the end of the optical cable after being saturatedly and fully filled with the rapid bonding agent, any one fiber included by the optical cable end is provided with the device for eliminating the end reflected light noise of the fiber, and the end face of the optical cable end is arranged in the protective cover cylinder. The device and method can effectively eliminate the reflected noise of the light end and improve the measurement precision of the light reflection signal.
Description
Technical field
The present invention relates to Fiber Filtering Technologies field, and in particular to a kind of device of elimination fiber end reflections optical noise.
Background technology
In outside environmental elements, when such as temperature, pressure, electric field, magnetic field change, it passes light characteristic optical fiber can occur
Change, by the change of the light phase in measurement optical fiber or light intensity, it is possible to extrapolate the change of measurand, utilize this
Sensor made by characteristic is referred to as sensing element type or functional Fibre-Optic Sensors.The spot light beam spread of laser instrument is flat
Traveling wave, Jing optical splitters are divided into reference light path and optical path, and external parameter (temperature, pressure, vibration etc.) causes fiber lengths
The light phase of change and phase place changes, and so as to produce the interference fringe of varying number, its mould is counted to movement, so that it may
The external physical quantity information such as measurement temperature or pressure.Sense in sensing element type or functional fiber for applying in prior art
Optical fiber in device, optical signal launch end and optical signal detecting end are generally arranged on same one end of optical fiber, but another for optical fiber
Simple section fixing process is only made in one end, or even untreated；In actually used, from optical signal detecting end capture it is anti-
Easily occurs the light noise cancellation signal of interference measurement results in feedback optical signal, these light noise cancellation signals can affect to a certain extent Fibre Optical Sensor
The certainty of measurement of device；To overcome this defect, this technology is covered in prior art using the means of sacrifice in measurement accuracy and is lacked
Fall into, but application space of the Fibre Optical Sensor in field of precision measurement is govern at quarter during the presence of this technological deficiency, to optical fiber
Following application prospect of sensor has also resulted in harmful effect.
It has been investigated that, above-mentioned smooth noise cancellation signal is mainly derived from the end face reflection of optical fiber connector, therefore researches and develops a elimination
The device of fiber end reflections optical noise, starts with from the source of light noise cancellation signal, eliminates optical noise, improves the signal of Fibre Optical Sensor
Sensitivity, to overcome above-mentioned technological deficiency to become a kind of required.
The content of the invention
It is an object of the invention to provide a kind of elimination optical fiber, the device and method of optical cable end reflection optical noise, have：Energy
Optical fiber, the technological merit of optical cable end face reflected light noise signal are effectively filtered out, being applied can be significantly in Fibre Optical Sensor
Lift the signal susceptibility of Fibre Optical Sensor.
The purpose of the present invention is to be achieved through the following technical solutions：
On the one hand, the present invention provides a kind of device for eliminating fiber end reflections optical noise, including：The shading of one end closing
Cover cylinder and solid thermalization bi-component epoxide-resin glue；The saturation filling solid thermalization bi-component epoxide-resin glue in the light shield cylinder
Afterwards, it is adhesive in the end of optical fiber；The optical fiber is located at the inwall and cylinder of the end face in the light shield cylinder and the light shield cylinder
Filled with the solid thermalization bi-component epoxide-resin glue between bottom.
In preferred embodiments, the solid thermalization bi-component epoxide-resin glue is 353ND.
In preferred embodiments, the radical of optical fiber gluing in the light shield cylinder is many.
On the other hand, the present invention also provides a kind of device comprising foregoing elimination fiber end reflections optical noise
The device of optical cable end reflection optical noise is eliminated, its structure still further comprises the protective cover of fast binder and one end closing
Cylinder；Saturation is filled after the fast binder in the protective cover cylinder, is adhesive in the end of optical cable；The optical cable end is included
Optical fiber be provided with it is described elimination fiber end reflections optical noise device；The end face of the end of the optical cable is located at the protection
In cover cylinder.
In preferred embodiments, the protective cover cylinder is metal tube.
In preferred embodiments, the internal diameter of the protective cover cylinder is 3.5mm, and external diameter is 4.5mm.
On the other hand, the present invention also provide it is a kind of elimination fiber end face reflect optical noise method, methods described include as
Lower step：The solid thermalization bi-component epoxide-resin glue of saturation filling liquid in the light shield cylinder closed at one end；By the end of optical fiber
The solid thermalization bi-component epoxide-resin glue of end insertion, optical fiber is inserted into the end face of one end with the inwall of light shield cylinder and cylinder bottom after insertion
Do not contact；Optical fiber is kept to stand relative to after the relative position of light shield cylinder, until solid thermalization bi-component epoxide-resin glue is complete
Solidification.
On the other hand, the present invention also provide it is a kind of elimination optical cable end reflection optical noise method, methods described include as
Lower step：According to the method that fiber end face reflects optical noise is eliminated, optical fiber connector will be eliminated positioned at the fiber placing of optical cable one end
The device of reflection optical noise；The full fast binder of saturation filling in the protective cover cylinder closed at one end；The end of optical cable is inserted
The protective cover cylinder, the outer wall of the optical cable insertion portion is gluing close by the fast binder with the inwall of the light shield cylinder
Envelope；Stand, until the fast binder solidifies completely.
In preferred embodiments, the inwall lap of the outer wall of the optical cable insertion portion and the light shield cylinder
Length range along direction of insertion is not less than 5mm.
In preferred embodiments, it is described except the method that fiber end face reflects optical noise includes：The screening closed at one end
The solid thermalization bi-component epoxide-resin glue of saturation filling liquid in light shield cylinder；By the solid thermalization bi-component epoxy of end insertion of optical fiber
Resin glue, optical fiber is inserted into the end face of one end and does not contact with the inwall of light shield cylinder and cylinder bottom after insertion；Keep optical fiber relative to
Stand after the relative position of light shield cylinder, until solid thermalization bi-component epoxide-resin glue solidifies completely.
Beneficial effects of the present invention are：
On the one hand the present invention has by providing the device of the elimination fiber end reflections optical noise of said structure and can reach
Effect filters the technique effect of fiber end face reflecting background.Wherein, optical fiber is arranging the device of elimination fiber end reflections optical noise
Before, end face reflection amplitude may be up to 160mv, and the end face reflection amplitude after said apparatus of the present invention that configures can be down to 0mv.Will
The fiber optic applications of said apparatus are configured with sensor, the induction sensitivity of Fibre Optical Sensor can be efficiently lifted, are significantly carried
Rise the measuring accuracy of fiber-optic signal.
Further, the present invention can reach highly efficient absorption optical signal by adopting 353ND, check light reflection
Technique effect.353ND is the bonding fiber agent product that Epoxy Technology companies of the U.S. develop and produce.It is applied to
The production of optic communication device, is widely used in the production of the joints of optical fibre.EPO-TEK 353ND are bi-components, 100% entity,
For a kind of heat-curable epoxy resin glue developed under hot conditions, although EPO-TEK 353ND designs are in 200 DEG C of continuous work.
But it also can work some minutes at 300-400 DEG C, EPO-TEK 353ND have excellent supporting to multi-solvents and chemicals
Resistance, is a kind of bonding agent for being preferably used to bind optical fiber, metal, glass, ceramics and most plastics.
Further, the present invention is by the gluing multifiber in same light shield cylinder, can meet every optical fiber
Needs of making an uproar are filtered, can be reached again and be saved the technique effect that light shield cylinder arranges quantity, be easy to the environment existed side by side in multifiber
Under, reducing after the device for eliminating fiber end reflections optical noise is arranged, the structure space for occupying is the device formed after setting
Miniaturization provides strong structural support.
On the other hand, the present invention can be effectively filtered out by providing a kind of device for eliminating optical cable end reflection optical noise
In the optical noise that optical cable end reflection is produced, the optical cable for being configured with said apparatus is applied in sensor or tester, energy
Enough induction sensitivities for efficiently lifting optical cable sensor, and the measuring accuracy that optical testing instrument is substantially improved；Wherein, in configuration
After stating device, no matter how many optical fiber are included in optical cable, can reach the technique effect that end face reflection amplitude is down to 0mv.Enter
One step, arranging for protective cover cylinder can form the mechanical protection of high intensity in optical cable end, can not only reach to cable end
Face forms the technique effect of waterproof sealing, additionally it is possible to allow optical cable end face further to tolerate the technology effect of at least 10Mpa ambient pressures
Really, the end face structure performance for making optical cable is increased dramatically.Further, due to all optical fiber in same optical cable also
Using fiber groupings are adhesive in multiple light shield cylinders, or all optical fiber can be adhesive in in same light shield cylinder this
Technological means, thus the volume of the final obtained device for eliminating optical cable end reflection optical noise can do it is very small, be adapted to
Apply in high-precision optical fiber sensor or optical testing instrument.
Further, the present invention is by providing the method and eliminate optical cable end reflection that elimination fiber end face reflects optical noise
The method of optical noise, is how to assemble and using the device and elimination optical cable end reflection light for eliminating fiber end reflections optical noise
The device of noise provides strong technical support.
Description of the drawings
The present invention is described in further detail below according to accompanying drawing.
Fig. 1 is the structural representation of the device that fiber end reflections optical noise is eliminated in the embodiment of the present invention 1；
Fig. 2 is the structural representation of the device that optical cable end reflection optical noise is eliminated in the embodiment of the present invention 2；
Fig. 3 is the structural representation of the device that optical cable end reflection optical noise is eliminated in the embodiment of the present invention 4；
Fig. 4 is the light path schematic diagram that light forms back-scattering light after fiber end face reflection in the embodiment of the present invention 5；
Fig. 5 is that light occurs in a fiber the light path schematic diagram formed after Raman scattering in Fig. 4；
Fig. 6 is back-scattering light " snapshot " in the embodiment of the present invention 5；
Fig. 7 is measured using distribution type fiber-optic detecting system when optical fiber connector is untreated in the embodiment of the present invention 5
Reflective light intensity curve map；
Fig. 8 is that filter is made according to prior art in optical fiber connector in the embodiment of the present invention 5 to make an uproar after process using distribution type fiber-optic
The reflective light intensity curve map that detecting system is measured；
Fig. 9 is to dispose above-mentioned elimination fiber end reflections optical noise of the invention in optical fiber connector in the embodiment of the present invention 5
The reflective light intensity curve map measured using distribution type fiber-optic detecting system after device.
In figure：
100th, the light shield cylinder of one end closing；200th, solid thermalization bi-component epoxide-resin glue；GXZ, elimination optical fiber connector are anti-
Penetrate the device of optical noise；300th, optical fiber；400th, fast binder；500th, the protective cover cylinder of one end closing；600th, optical cable；1st, light
Cable；2nd, fast binder；3rd, optical fiber；4th, steel pipe；5th, plastic straighttube；6、353ND；R, incident light；B, back-scattering light；Y, signal
Intensity；X, frequency shifting；S, Stokes；F, anti-Stokes；A1, the first reflection light；A2, the second reflection light；It is Z, anti-
Penetrate noise.
Specific embodiment
Embodiment 1：
As shown in figure 1, the present invention provides a kind of device for eliminating fiber end reflections optical noise, including：One end closing
Light shield cylinder 100 and solid thermalization bi-component epoxide-resin glue 200；The full solid thermalization of saturation filling in the light shield cylinder 100
After bi-component epoxide-resin glue 200, the end of optical fiber 300 is adhesive in；The optical fiber 300 is located in the light shield cylinder 100
Filled with the solid thermalization bi-component epoxide-resin glue between the inwall and cylinder bottom of end face and the light shield cylinder 100.
During assembling, the solid thermalization bi-component epoxide-resin glue of saturation filling liquid in the light shield cylinder closed at one end；Will
The solid thermalization bi-component epoxide-resin glue of end insertion of optical fiber, after insertion optical fiber be inserted into one end end face it is interior with light shield cylinder
Wall and cylinder bottom do not contact；Optical fiber is kept to stand relative to after the relative position of light shield cylinder, until solid thermalization bi-component epoxy tree
Fat glue solidifies completely.
When using, the fiber optic applications of the device of above-mentioned elimination fiber end reflections optical noise can will be provided with Fibre Optical Sensor
In device or test optical fiber instrument, because the optical signal that optical fiber feeds back no longer carries end face reflection signal, rear light is installed
Measuring accuracy after the induction sensitivity that fiber sensor is obtained, and the improvement of test optical fiber instrument can be significantly improved.
Preferably, in an optimal technical scheme of the present embodiment, the solid thermalization bi-component epoxide-resin glue is
353ND.The present invention can reach highly efficient absorption optical signal by adopting 353ND, check the technique effect of light reflection.
353ND is the bonding fiber agent product that Epoxy Technology companies of the U.S. develop and produce.Suitable for optic communication device
The production of part, is widely used in the production of the joints of optical fibre.EPO-TEK353ND is bi-component, and 100% entity is high temperature bar
A kind of heat-curable epoxy resin glue developed under part, although EPO-TEK 353ND designs are in 200 DEG C of continuous work.But it
300-400 DEG C also can work some minutes, and EPO-TEK 353ND have excellent repellence to multi-solvents and chemicals, are
A kind of bonding agent for being preferably used to bind optical fiber, metal, glass, ceramics and most plastics.
Preferably, in an optimal technical scheme of the present embodiment, the radical of gluing optical fiber in the light shield cylinder
For many.The present invention by the gluing multifiber in same light shield cylinder, make an uproar needs by the filter that can meet every optical fiber, and
Can reach and save the technique effect that light shield cylinder arranges quantity, be easy in the environment of multifiber is present side by side, reduction will disappear
After arranging except the device of fiber end reflections optical noise, the structure space for occupying, the device miniaturization to be formed after arranging is provided
Strong structural support.
Preferably, in an optimal technical scheme of the present embodiment, the internal diameter of the light shield cylinder is 2mm, and external diameter is
2.8mm.By adopt internal diameter for 2mm, external diameter is the light shield cylinder of 2.8mm to the present invention, and the filter that can meet simple optical fiber is made an uproar need
Will, the technique effect of material-saving can be reached again.
The device of the elimination fiber end reflections optical noise that the present invention passes through offer said structure can reach and effectively filter out
The technique effect of fiber end face reflecting background.Wherein, optical fiber was held before the device for eliminating fiber end reflections optical noise is arranged
Face reflection amplitudes may be up to 160mv, and the end face reflection amplitude after said apparatus of the present invention that configures can be down to 0mv.To be configured with
The fiber optic applications of said apparatus can efficiently lift the induction sensitivity of Fibre Optical Sensor in sensor, and optical fiber is substantially improved
The measuring accuracy of signal.
Embodiment 2：
Shown in Fig. 2, the present embodiment is on the basis of embodiment 1, it is further provided one kind eliminates optical cable end reflection light and makes an uproar
The device of sound, including the device GXZ of fiber end reflections optical noise is eliminated, also close including fast binder 400 and one end
Protective cover cylinder 500；In the protective cover cylinder 500 after the full fast binder 400 of saturation filling, the end of optical cable 600 is adhesive in
End；The optical fiber 300 that the end of the optical cable 600 is included is provided with the device of the elimination fiber end reflections optical noise；It is described
The end face of the end of optical cable is located in the protective cover cylinder.
Preferably, in an optimal technical scheme of the present embodiment, the protective cover cylinder is metal tube.
Preferably, in an optimal technical scheme of the present embodiment, the protective cover cylinder is 304 stainless-steel pipes.
Preferably, in an optimal technical scheme of the present embodiment, the internal diameter of the protective cover cylinder is 3.5mm, external diameter
For 4.5mm.
When using, according to the method that fiber end face reflects optical noise is eliminated, will eliminate positioned at the fiber placing of optical cable one end
The device of fiber end reflections optical noise；The full fast binder of saturation filling in the protective cover cylinder closed at one end；By optical cable
The protective cover cylinder is inserted in end, and the inwall of the outer wall of the optical cable insertion portion and the light shield cylinder is by the rapid link
Agent adhesive sealing；Stand, until the fast binder solidifies completely.It should be noted that in the present embodiment, being wrapped in optical cable
The each optical fiber for containing is required for doing end face filter and makes an uproar processs, when practical operation arranges the device of elimination fiber end reflections optical noise
The independent gluing light shield cylinder on each optical fiber can be selected；Optical fiber can also be divided into some groups, per group includes some
Optical fiber, is then respectively adhesive in each optical fiber group in corresponding shading sleeve；Can also be using after all optical fiber be all concentrated
Collective is adhesive in same light shield cylinder.Experiment shows that above-mentioned different embodiment can obtain good fiber end face filter and make an uproar
Technique effect.
Preferably, in an optimal technical scheme of the present embodiment, outer wall and the screening of the optical cable insertion portion
The inwall lap of light shield cylinder is not less than 5mm along the length range of direction of insertion.
It should be noted that the number of fibers wrapped up in optical cable in the present embodiment is unrestricted, it is used quick in the present invention
Bonding agent is prior art, and according to the fast binder of any condition acquired in prior art the present invention is may be applicable to, therefore with
The related manufacturer of fast binder and model will not be described here.
The present invention can be effectively filtered out in optical cable end by providing a kind of device for eliminating optical cable end reflection optical noise
The optical noise that reflection is produced, the optical cable for being configured with said apparatus is applied in sensor or tester, can efficiently be lifted
The induction sensitivity of optical cable sensor, and the measuring accuracy of optical testing instrument is substantially improved；Wherein, configure after said apparatus,
No matter how many optical fiber are included in optical cable, can reach the technique effect that end face reflection amplitude is down to 0mv.Further, protect
Arranging for shield cylinder can form the mechanical protection of high intensity in optical cable end, can not only reach and form waterproof to optical cable end face
The technique effect of sealing, additionally it is possible to allow optical cable end face further to tolerate the technique effect of at least 10Mpa ambient pressures, make optical cable
End face structure performance is increased dramatically.Further, incite somebody to action because all optical fiber in same optical cable can also be adopted
Fiber groupings are adhesive in multiple light shield cylinders, or all optical fiber are adhesive in into this technological means in same light shield cylinder,
Therefore the volume of the final obtained device for eliminating optical cable end reflection optical noise can do it is very small, be suitably applied in high-precision
In degree Fibre Optical Sensor or optical testing instrument.
Embodiment 3：
The present invention also provides a kind of method that elimination fiber end face reflects optical noise on the basis of above-described embodiment, described
Method comprises the steps：
The solid thermalization bi-component epoxide-resin glue of saturation filling liquid in the light shield cylinder closed at one end；
By the solid thermalization bi-component epoxide-resin glue of end insertion of optical fiber, optical fiber is inserted into the end face of one end and hides after insertion
The inwall of light shield cylinder and cylinder bottom do not contact；
Optical fiber is kept to stand relative to after the relative position of light shield cylinder, until solid thermalization bi-component epoxide-resin glue is complete
Solidification.
It should be noted that the number of fibers inserted in this method in same light shield cylinder is unrestricted, when multifiber simultaneously
In the presence of row, multifiber is adhesive in same light shield cylinder simultaneously should also fall into protection scope of the present invention.
The present invention furthermore provides a kind of side of elimination optical cable end reflection optical noise on the basis of above-described embodiment
Method, methods described comprises the steps：
According to the method that fiber end face reflects optical noise is eliminated, optical fiber connector will be eliminated positioned at the fiber placing of optical cable one end
The device of reflection optical noise；
The full fast binder of saturation filling in the protective cover cylinder closed at one end；
The protective cover cylinder is inserted in the end of optical cable, in the outer wall of the optical cable insertion portion and the light shield cylinder
Wall is by the fast binder adhesive sealing；
Stand, until the fast binder solidifies completely.
Preferably, the present embodiment is on the basis of above-described embodiment, outer wall and the shading of the optical cable insertion portion
The inwall lap of cover cylinder is not less than 5mm along the length range of direction of insertion.
Further, in an optimal technical scheme of the present embodiment, the above-mentioned side that optical noise is reflected except fiber end face
Method includes：
The solid thermalization bi-component epoxide-resin glue of saturation filling liquid in the light shield cylinder closed at one end；
By the solid thermalization bi-component epoxide-resin glue of end insertion of optical fiber, optical fiber is inserted into the end face of one end and hides after insertion
The inwall of light shield cylinder and cylinder bottom do not contact；
Optical fiber is kept to stand relative to after the relative position of light shield cylinder, until solid thermalization bi-component epoxide-resin glue is complete
Solidification.
The present invention is by providing the method and eliminate optical cable end reflection optical noise that elimination fiber end face reflects optical noise
Method, is how to assemble and using the dress of the device and elimination optical cable end reflection optical noise for eliminating fiber end reflections optical noise
Put there is provided strong technical support.
Embodiment 4：
As shown in figure 3, the present invention provides the device of optical cable end face reflecting background of a elimination only containing an optical fiber, its knot
Structure includes：Fast binder 2, steel pipe 4, plastic straighttube 5 and 353ND (6) composition.Internal diameter 2mm external diameters are adopted in the present embodiment
2.8mm length be 15mm plastic straighttube 5 in be put into the 353ND of the ratio of mixing up, in the tail end of optical fiber 3 insertion plastic straighttube.From
In being inserted into process of setting, the end face reflection of optical fiber 3 is all wholly absent.In the present embodiment using internal diameter be 3.5mm external diameters be 4.5mm
Length is 304 stainless-steel pipes 4 of 30mm, and tail end is closing, and the inside is filled with fast binder 2, the straight tube of internal diameter 2mm is inserted
In entering steel pipe, such straight tube and a part of optical cable are all fixed in steel pipe, and the tail end of optical cable 1 just plays sealing waterproof, resistance to 10Mpa's
Pressure.The present invention solves the problems, such as fiber end face reflection by said apparatus, and optical cable end face seal and pressure is solved again
Problem.Reduced to 0mv by 160mv using rear original facet surface reflection amplitudes.
Embodiment 5：
In the present embodiment, concrete scheme after said apparatus of the present invention and method are applied in Distributed Optical Fiber Sensing Techniques
And effect is as follows：
First, distribution type fiber-optic detecting system is mainly made up of two parts：Distribution type fiber-optic signal (FBG) demodulator is more with linear
Mould temperature sensing optical cable.The part such as distribution type fiber-optic signal (FBG) demodulator enclosed inside optical device, laser instrument, data processing constitutes, mainly
For functions such as the signals collecting of whole system, signal analysis and analysis result outputs.Multimode temperature sensing optical cable is sensed as line style
Device a, optical cable can be grown to several kilometers, or even dozens of kilometres, obtained by analyzing the light scattering signal in optical cable on diverse location
To corresponding temperature information.Distribution type fiber-optic detecting system can accurately measure thousands of location point temperature on whole optical fiber
Information.
Therefore distribution type fiber-optic has the advantage that：
1st, in temperature-measuring system of distributed fibers, optical cable is both temperature sensor and signal transmission passage, it is no longer necessary to
Other measurements or transmitting device；
2nd, optical cable can provide the information of up to ten thousand measurement points, quick for installation easy and with low cost, long after installation
Phase uses and non-maintaining；
3rd, optical fiber have high temperature resistant (high temperature more than 1000 DEG C can be born), it is anticorrosive, block water and long-life speciality,
Suitable for various complicated harmful or adverse circumstances；
4th, optical fiber has the speciality of anti-radio frequency and electromagnetism interference, it is adaptable to high pressure occasion；
5th, optical fiber has without electrostatic, radiationless speciality, will not produce electric spark, it is adaptable to inflammable and explosive environment；
6th, light thin soft and slender, the small volume of optical fiber itself, lightweight, is not only convenient for laying and installs, and to burying the material at position
Material performance and mechanics parameter affect very little, can realize lossless embedded etc..
The operation principle of above-mentioned distribution type fiber-optic detecting system is as follows：
Laser light pulse is injected among the optical fiber of sensing, close due to optical fiber in light pulse communication process forward
There is scattering phenomenon in the reasons such as degree, stress, material composition, temperature and flexural deformation, the scattered light of some can be according to incidence
The contrary direction of light is propagated, referred to as back-scattering light, and the back-scattering light of return includes：
1st, Rayleigh (RayLeigh) scattering, is caused by the minor variations of optical fibre refractivity, its frequency and incident light pulse one
Cause；
2nd, Raman (Raman) scattering, is interacted with optical phonon by photon and is caused, and its frequency differs several with incident light pulse
Ten Terahertzs；Shown in Fig. 4, incident light is entered after optical fiber there is Raman (Raman) scattering, into the incident light in optical fiber in optical fiber
Interior reflection path is as shown in Figure 5.In figure, incident light R forms back-scattering light B Jing after fiber reflection.
3rd, Brillouin (Brillouin) scattering, is caused by photon with elastic sound waves field low frequency phonon interaction in optical fiber.
Its frequency differs tens GHzs with incident light pulse；
" snapshot " of back-scattering light shown in Fig. 6, Raman scatterings can produce the signal of two different frequencies：Stokes
(Stokes) light (light longer than optical source wavelength) and anti-Stokes (Anti-Stokes) light (light shorter than optical source wavelength), light
Fibre is modulated by external temperature and makes anti-Stokes (Anti-Stokes) light intensity in optical fiber change, Anti-Stokes and
The ratio of Stokes provides the absolute instruction of temperature, can be realized to the distributed survey along fiber optic temperature field using this principle
Amount.Wherein, shown in Fig. 6, longitudinal axis Y is signal strength signal intensity, and transverse axis X is frequency shifting, and Stokes S is temperature independent, and anti-this support
Gram this F is relevant with temperature, and the wavelength of incident light R is 1064nm.
Wherein, distribution type fiber-optic detecting system positioning principle is as follows：
Optical time domain reflectance (OTDR) is used primarily for evaluating the performance of telecommunication optical fiber, optical cable and coupler, be for
Inspection fibre loss, the means of fiber failure.Typically DTS temperature-measurement principles and positioning principle are referred to as into ROTDR, its working mechanism is
Launch light pulse to tested optical fiber, Raman scattering phenomenon occurs, back-scattering light and forward scattering light are formed in a fiber.Its
In, the initiating terminal (injection end of namely light pulse) of back-scattering light back-propagation to optical fiber, because each is dorsad propagated
Scattered light all correspond to optical fiber on a scattering point, therefore, optical fiber just be can determine whether out according to the traveling time of back-scattering light
The upper position that scattering point occurs.
D=(c × t)/2 × (IOR)
Wherein, c is light speed in a vacuum, and t be signal transmitting after to the total time for receiving signal (round trip),
IOR is optical fibre refractivity.
Produced when gathering and analyzing incident light pulse and propagate in optical fiber from after one end (injection end) injection of optical fiber
The time and intensity information of Raman back-reflection light obtain corresponding position.
Shown in Fig. 7～Fig. 9, optical fiber connector it is untreated, only optical fiber connector is handled it according to prior art and according to this
Invention above-mentioned technical proposal optical fiber connector is handled it after reflective light intensity curve map, can clearly compare from figure, instead
Penetrate light A1 and A2 and there is light reflecting background Z in figures 7 and 8, wherein, the light reflecting background in Fig. 7 is the most obvious；Fig. 9
It is shown, using said apparatus of the present invention after, to the elimination of light reflecting background Z effect especially substantially, light reflecting background Z is obtained
Completely check, light reflected signal is very clear.
The present invention is not limited to above-mentioned preferred forms, and anyone can show that other are various under the enlightenment of the present invention
The product of form, however, make any change in its shape or structure, it is every with skill identical or similar to the present application
Art scheme, is within the scope of the present invention.
Claims (10)
1. it is a kind of eliminate fiber end reflections optical noise device, it is characterised in that include：Light shield cylinder and consolidate that one end is closed
Thermalization bi-component epoxide-resin glue；It is gluing in the light shield cylinder after the saturation filling solid thermalization bi-component epoxide-resin glue
In the end of optical fiber；Fill out between the inwall of end face and the light shield cylinder of the optical fiber in the light shield cylinder and cylinder bottom
Filled with the solid thermalization bi-component epoxide-resin glue.
2. it is according to claim 1 eliminate fiber end reflections optical noise device, it is characterised in that：The solid thermalization is double
Component epoxy glue is 353ND.
3. it is according to claim 1 eliminate fiber end reflections optical noise device, it is characterised in that：The light shield cylinder
The radical of interior gluing optical fiber is many.
4. it is a kind of comprising described in claim 1 elimination fiber end reflections optical noise device elimination optical cable end reflection light
The device of noise, it is characterised in that：Also include the protective cover cylinder that fast binder and one end are closed；Saturation in the protective cover cylinder
After filling the fast binder, the end of optical cable is adhesive in；The optical fiber that the optical cable end is included is provided with the elimination
The device of fiber end reflections optical noise；The end face of the end of the optical cable is located in the protective cover cylinder.
5. it is according to claim 4 eliminate optical cable end reflection optical noise device, it is characterised in that：The protective cover cylinder
For metal tube.
6. according to claim 4 or 5 elimination optical cable end reflection optical noise device, it is characterised in that：The protection
The internal diameter of cover cylinder is 3.5mm, and external diameter is 4.5mm.
7. a kind of to eliminate the method that fiber end face reflects optical noise, methods described comprises the steps：
The solid thermalization bi-component epoxide-resin glue of saturation filling liquid in the light shield cylinder closed at one end；
By the solid thermalization bi-component epoxide-resin glue of end insertion of optical fiber, optical fiber is inserted into the end face and light shield of one end after insertion
The inwall and cylinder bottom of cylinder is not contacted；
Optical fiber is kept to stand relative to after the relative position of light shield cylinder, until solid thermalization bi-component epoxide-resin glue coagulates completely
Gu.
8. a kind of method for eliminating optical cable end reflection optical noise, methods described comprises the steps：
According to the method that fiber end face reflects optical noise is eliminated, fiber end reflections will be eliminated positioned at the fiber placing of optical cable one end
The device of optical noise；
The full fast binder of saturation filling in the protective cover cylinder closed at one end；
The protective cover cylinder is inserted in the end of optical cable, the inwall quilt of the outer wall of the optical cable insertion portion and the light shield cylinder
The fast binder adhesive sealing；
Stand, until the fast binder solidifies completely.
9. method according to claim 8, it is characterised in that：The outer wall of the optical cable insertion portion and the light shield cylinder
Inwall lap along direction of insertion length range be not less than 5mm.
10. method according to claim 9, it is characterised in that：The method except fiber end face reflection optical noise includes：
The solid thermalization bi-component epoxide-resin glue of saturation filling liquid in the light shield cylinder closed at one end；
By the solid thermalization bi-component epoxide-resin glue of end insertion of optical fiber, optical fiber is inserted into the end face and light shield of one end after insertion
The inwall and cylinder bottom of cylinder is not contacted；
Optical fiber is kept to stand relative to after the relative position of light shield cylinder, until solid thermalization bi-component epoxide-resin glue coagulates completely
Gu.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611069992.9A CN106646754A (en) | 2016-11-29 | 2016-11-29 | Device and method for eliminating end reflected light noise of fiber and optical cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611069992.9A CN106646754A (en) | 2016-11-29 | 2016-11-29 | Device and method for eliminating end reflected light noise of fiber and optical cable |
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| CN201611069992.9A Pending CN106646754A (en) | 2016-11-29 | 2016-11-29 | Device and method for eliminating end reflected light noise of fiber and optical cable |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108426840A (en) * | 2018-05-21 | 2018-08-21 | 大连理工大学 | A kind of real-time sensor for measuring inside concrete humidity |
| CN112198591A (en) * | 2020-09-29 | 2021-01-08 | 中国石油天然气股份有限公司 | Fresnel noise suppression unit at tail end of optical fiber and manufacturing method thereof |
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