CN208921273U - A kind of distributed optical fiber vibration sensing system - Google Patents
A kind of distributed optical fiber vibration sensing system Download PDFInfo
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- CN208921273U CN208921273U CN201821598461.3U CN201821598461U CN208921273U CN 208921273 U CN208921273 U CN 208921273U CN 201821598461 U CN201821598461 U CN 201821598461U CN 208921273 U CN208921273 U CN 208921273U
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Abstract
The utility model relates to a kind of distributed optical fiber vibration sensing systems, including narrow linewidth light source, acousto-optic modulator, fiber amplifier, circulator, the first two-way raman amplifier, the first optical fiber, the second two-way raman amplifier, the second optical fiber, bandpass filter, photodetector, signal processing apparatus and driver.Transmission range is improved using two two-way raman amplifiers, a two-way raman amplifier and a bandpass filter are increased on the basis of original optical path, not only Output optical power is improved, but also prevents multistage Raman amplifiction noise is excessive from signal quality being caused to deteriorate, improves the detection accuracy of signal light.
Description
Technical field
The utility model relates to technical field of optical fiber sensing, and in particular to a kind of distributed optical fiber vibration sensing system.
Background technique
There are many distributed vibrating sensing technology and methods based on optical fiber both at home and abroad at present, but are mainly based upon OTDR
(Optical Time Domain Reflectometry) technology and multiplexing are (as time division multiplexing, wavelength-division multiplex, frequency division are multiple
With etc.) technology.
The pulse laser that laser emits narrow linewidth is transmitted along sensor fibre, while constantly being generated the Rayleigh transmitted backward and being dissipated
Light is penetrated, and multiple-beam interference occurs for these Rayleigh scattering lights.Pulse laser can gradually decay when transmitting along optical fiber, lead to return
Rayleigh scattering luminous intensity is very faint, so that it cannot separating with ambient noise, then the vibration signal of this distance can not be detected
It arrives.
That there are effective detection ranges is short for the distributed optical fiber sensing system in industry at present, is set to accuracy not to vibration source
Disadvantage high, fiber optic interferometric sensitivity is low.
Utility model content
In view of this, the present invention provides a kind of distributed optical fiber vibration sensing systems, using two two-way Ramans
Amplifier improves transmission range, increases a two-way raman amplifier and a bandpass filtering on the basis of original optical path
Device not only improves Output optical power, but also prevents multistage Raman amplifiction noise is excessive from signal being caused to deteriorate, and improves the detection of signal light
Precision.
To achieve the above object, present invention employs a kind of technical solutions: a kind of distributed optical fiber vibration sensing includes narrow
Line width light source, acousto-optic modulator, fiber amplifier, circulator, the first two-way raman amplifier, the first optical fiber, the second two-way drawing
Graceful amplifier, the second optical fiber, bandpass filter, photodetector, signal processing apparatus and driver, the circulator include ring
Shape device input terminal, the first output end of circulator and circulator second output terminal.
Narrow linewidth light source output end is connect with one input terminal of acousto-optic modulator, the acousto-optic modulator output end
It is connect with the fiber amplifier input terminal, the fiber amplifier output end is connect with the input terminal of the circulator, described
The first output end of circulator is connect with the described first two-way raman amplifier input terminal, the first two-way raman amplifier output
End is connect with first optic fibre input end, and first fiber-optic output connects with the described second two-way raman amplifier input terminal
It connects, the second two-way raman amplifier output end is connect with second optic fibre input end, the circulator second output terminal
It is connect with the bandpass filter input terminal, the bandpass filter output end is connect with the photodetector input terminal, institute
It states photodetector output end to connect with the signal processing apparatus input terminal, the signal processing apparatus output end and the drive
Dynamic device input terminal connection, the driver output end are connect with another input terminal of the acousto-optic modulator.
The narrow linewidth light source, acousto-optic modulator, fiber amplifier, circulator, the first two-way raman amplifier, the first light
It is attached by optical fiber between fibre, the second two-way raman amplifier, the second optical fiber, bandpass filter and photodetector,
Pass through electric connection between the photodetector, signal processing apparatus, driver and acousto-optic modulator.
Further, the narrow linewidth light source is the continuous light that is concerned with.
Further, the fiber amplifier is pulsed erbium doped fiber amplifier.
Further, first optical fiber, the second optical fiber are general single mode fiber.
Further, the photodetector is avalanche photodide.
Further, the signal processing apparatus includes source of synchronising signal and capture card, and the source of synchronising signal output is same
Driving signal and synchronization signal are walked, generates pulse signal by the way that synchronized signal is transferred to the driver, while same
Step signal is transferred to the capture card, when pulse signal return carries out signal acquisition.
The utility model has the following beneficial effects: the utility model improves transmission distance using two two-way raman amplifiers
From, a two-way raman amplifier and a bandpass filter are increased on the basis of original optical path, both improve Output optical power,
It prevents multistage Raman amplifiction noise is excessive signal quality is caused to deteriorate again, improves the detection accuracy of signal light.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is 40km distributed optical fiber vibration test result；
Fig. 3 is 80km distributed optical fiber vibration test result.
In figure: 1- narrow linewidth light source, 2- acousto-optic modulator, 3- fiber amplifier, 4- circulator, 40- circulator input terminal,
The first output end of 41- circulator, 42- circulator second output terminal, the two-way raman amplifier of 5- first, the first optical fiber of 6-, 7-
Two two-way raman amplifiers, the second optical fiber of 8-, 9- bandpass filter, 10- photodetector, 11- signal processing apparatus, 12- drive
Dynamic device.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, all other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.
As shown in Figure 1, the embodiments of the present invention provide a kind of distributed optical fiber vibration sensing system, including narrow line
Wide light source 1, acousto-optic modulator 2, fiber amplifier 3, circulator 4, the first two-way raman amplifier 5, the first optical fiber 6, second pairs
It is described to raman amplifier 7, the second optical fiber 8, bandpass filter 9, photodetector 10, signal processing apparatus 11, driver 12
Circulator 4 includes circulator input terminal 40, the first output end of circulator 41 and circulator second output terminal 42.
1 output end of narrow linewidth light source is connect with 2 one input terminal of acousto-optic modulator, and the acousto-optic modulator 2 is defeated
Outlet is connect with 3 input terminal of fiber amplifier, the input terminal 40 of 3 output end of fiber amplifier and the circulator 4
Connection, 4 first output end 41 of circulator are connect with the described first two-way 5 input terminal of raman amplifier, and described first is two-way
5 output end of raman amplifier is connect with 6 input terminal of the first optical fiber, 6 output end of the first optical fiber and described second two-way
The connection of 7 input terminal of raman amplifier, second two-way 7 output end of raman amplifier are connect with 8 input terminal of the second optical fiber,
4 second output terminal 42 of circulator is connect with 9 input terminal of bandpass filter, 9 output end of bandpass filter and institute
The connection of 10 input terminal of photodetector is stated, 10 output end of photodetector and 11 input terminal of signal processing apparatus connect
Connect, 11 output end of signal processing apparatus is connect with the driver input end 12,12 output end of driver with it is described
The connection of another input terminal of acousto-optic modulator 2.
The narrow linewidth light source 1, acousto-optic modulator 2, fiber amplifier 3, circulator 4, the first two-way raman amplifier 5,
Pass through between first optical fiber 6, the second two-way raman amplifier 7, the second optical fiber 8, bandpass filter 9 and photodetector 10
Optical fiber is attached, and is passed through between the photodetector 10, signal processing apparatus 11, driver 12 and acousto-optic modulator 2
It is electrically connected.
Preferably, the narrow linewidth light source 1 is the continuous light that is concerned with.
Preferably, the fiber amplifier 3 is pulsed erbium doped fiber amplifier.
Preferably, first optical fiber 6, the second optical fiber 8 are general single mode fiber.
Preferably, the photodetector 10 is avalanche photodide.
Preferably, the signal processing apparatus 11 includes source of synchronising signal and capture card, and the source of synchronising signal output is same
Driving signal and synchronization signal are walked, generates pulse signal, while handle by the way that synchronized signal is transferred to the driver 12
Synchronous transmission of signal is to the capture card, when pulse signal return carries out signal acquisition.
The narrow linewidth light source 1 exports continuous light, is modulated into pulsed light through the acousto-optic modulator 2, then through the optical fiber
It after amplifier 3 amplifies, is inputted from the circulator input terminal 40, then from described in first output end of circulator 41 output entrance
First raman amplifier 5 carries out light amplification, anti-due to first optical fiber 6 subsequently into transmitting in first optical fiber 6
The effect of penetrating, a part of light generate reflection, and reflected light is produced from relevant in 6 transmission process of the first optical fiber, and return to institute
It states the first raman amplifier 5 to amplify again, and enters first output end of circulator 41, then exported from the circulator second
42 output of end, enters the photodetector 10 after the bandpass filter 9 filtering and is converted into electric signal, the signal processing
After device 11 collects electric signal, then by data processing come the case where analyzing vibration；Another part light continues described first
It is transferred into the described second two-way raman amplifier 7 in optical fiber 6 to amplify, second optical fiber 8 is entered back into, also due to institute
The reflex of the second optical fiber 8 is stated, a part of light generates reflection, and reflected light is produced from 8 transmission process of the second optical fiber
It is relevant, and amplify again back to the described second two-way raman amplifier 7, then photosynthetic one with the reflection of first optical fiber 6
It rises and is used as same Shu Guang, another part light is directly exported from second optical fiber 8.
It is the test of 40km distributed optical fiber vibration and 80km distributed optical fiber vibration test result, figure respectively such as Fig. 2, Fig. 3
3 test result is carried out according to Fig. 1 optical path, and the test result of Fig. 2 is that the two-way Raman is reduced on the basis of Fig. 1 optical path
What amplifier 7, the second optical fiber 8 and bandpass filter 9 carried out.The test process of Fig. 2 is as follows: opening 1 He of narrow linewidth light source
The power supply of fiber amplifier 3 slowly modulates the electric current of the described first two-way raman amplifier 5, until optical signal transmission effect reaches
To best, stop increasing electric current when optical signal transmission is farthest, the electric current of the described first two-way raman amplifier 5 is at this time
Optimum current；If continuing growing the electric current of the described first two-way raman amplifier 5, it is found that noise increases in transmission process, light
The distance of signal transmission is reduced instead.
The test process of Fig. 3 is as follows: connecting all devices according to Fig. 1 optical path optical fiber, first connects first optical fiber 6
(for example, 6 length of the first optical fiber is set as 40km), it is the same with aforesaid operations, open the narrow linewidth light source 1 and fiber amplifier 3
Power supply, slowly modulate the electric current of the described first two-way raman amplifier 5, the described first two-way raman amplifier 5 be transferred to most
Good electric current, then connects the described second two-way raman amplifier 7, reconnects second optical fiber 8 (for example, the second fiber lengths are set
For 40km), then the electric current of the described second two-way raman amplifier 7 is adjusted, gradually increases the described second two-way raman amplifier 7
Electric current, while the electric current of the described first two-way raman amplifier 5 is also reduced, guarantee the signal matter of the first optical fiber 6 described in 40km
Amount, until optical signal has all arrived optimum state in first optical fiber 6 and the second optical fiber 8, just stopping adjusts first Raman
The electric current of two-way amplifier 5 and the second two-way raman amplifier 7, optical signal transmission distance increases one times at this time, and corresponding
Signal quality does not deteriorate.
The innovative point of the utility model is to improve transmission range using two two-way raman amplifiers, in original optical path base
A two-way raman amplifier and a bandpass filter are increased on plinth, not only improves Output optical power, but also prevent multistage Raman
Noise is excessive that signal quality is caused to deteriorate for amplification, improves the detection accuracy of signal light.
It is worth noting that: in the description of the present invention, unless otherwise clearly defined and limited, term " peace
The terms such as dress ", " connected ", " connection ", " fixation " shall be understood in a broad sense, for example, it may be being fixedly connected, be also possible to detachable
Connection, or be integrally connected, it can be mechanical connection, it for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
Herein, the nouns of locality such as related front, rear, top, and bottom are to be located in figure with components in attached drawing and zero
Part mutual position defines, only for the purpose of expressing the technical solution clearly and conveniently.It should be appreciated that the noun of locality
Use should not limit the claimed range of the application.
In the absence of conflict, the feature in embodiment and embodiment herein-above set forth can be combined with each other.
Above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；Although referring to aforementioned reality
Example is applied the utility model is described in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and model of various embodiments of the utility model technical solution that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (7)
1. a kind of distributed optical fiber vibration sensing system, it is characterised in that: the distributed optical fiber vibration sensing system includes narrow
Line width light source, acousto-optic modulator, fiber amplifier, circulator, the first two-way raman amplifier, the first optical fiber, the second two-way drawing
Graceful amplifier, the second optical fiber, bandpass filter, photodetector, signal processing apparatus and driver, the circulator include ring
Shape device input terminal, the first output end of circulator and circulator second output terminal；
Narrow linewidth light source output end is connect with one input terminal of acousto-optic modulator, the acousto-optic modulator output end and institute
The connection of fiber amplifier input terminal is stated, the fiber amplifier output end is connect with the input terminal of the circulator, the annular
The first output end of device is connect with the described first two-way raman amplifier input terminal, the first two-way raman amplifier output end with
The first optic fibre input end connection, first fiber-optic output are connect with the described second two-way raman amplifier input terminal,
The second two-way raman amplifier output end is connect with second optic fibre input end, the circulator second output terminal and institute
The connection of bandpass filter input terminal is stated, the bandpass filter output end is connect with the photodetector input terminal, the light
Electric explorer output end is connect with the signal processing apparatus input terminal, the signal processing apparatus output end and the driver
Input terminal connection, the driver output end are connect with another input terminal of the acousto-optic modulator；
The narrow linewidth light source, acousto-optic modulator, fiber amplifier, circulator, the first two-way raman amplifier, the first optical fiber,
It is attached by optical fiber between second two-way raman amplifier, the second optical fiber, bandpass filter and photodetector, it is described
Pass through electric connection between photodetector, signal processing apparatus, driver and acousto-optic modulator.
2. a kind of distributed optical fiber vibration sensing system as described in claim 1, it is characterised in that: the narrow linewidth light source is phase
Involvement continues light.
3. a kind of distributed optical fiber vibration sensing system as described in claim 1, it is characterised in that: the fiber amplifier is arteries and veins
Rush erbium-doped fiber amplifier.
4. a kind of distributed optical fiber vibration sensing system as described in claim 1, it is characterised in that: first optical fiber is common
Single mode optical fiber.
5. a kind of distributed optical fiber vibration sensing system as described in claim 1, it is characterised in that: second optical fiber is common
Single mode optical fiber.
6. a kind of distributed optical fiber vibration sensing system as described in claim 1, it is characterised in that: the photodetector is snow
Avalanche photo diode.
7. a kind of distributed optical fiber vibration sensing system as described in claim 1, it is characterised in that: the signal processing apparatus packet
Source of synchronising signal and capture card, the source of synchronising signal output synchronized signal and synchronization signal are included, by driving synchronous
Signal is transferred to the driver and generates pulse signal, while synchronous transmission of signal to the capture card, when pulse signal returns
Signal acquisition is carried out back.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821598461.3U CN208921273U (en) | 2018-09-28 | 2018-09-28 | A kind of distributed optical fiber vibration sensing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821598461.3U CN208921273U (en) | 2018-09-28 | 2018-09-28 | A kind of distributed optical fiber vibration sensing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111912543A (en) * | 2020-07-29 | 2020-11-10 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Distributed optical fiber temperature sensing system |
| CN112213000A (en) * | 2020-11-10 | 2021-01-12 | 姚峰 | Distributed optical fiber temperature sensing system and application thereof |
-
2018
- 2018-09-28 CN CN201821598461.3U patent/CN208921273U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111912543A (en) * | 2020-07-29 | 2020-11-10 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Distributed optical fiber temperature sensing system |
| CN112213000A (en) * | 2020-11-10 | 2021-01-12 | 姚峰 | Distributed optical fiber temperature sensing system and application thereof |
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