CN206556760U - Raman amplifier for increasing distributed optical fiber vibration sensing system detection range - Google Patents
Raman amplifier for increasing distributed optical fiber vibration sensing system detection range Download PDFInfo
- Publication number
- CN206556760U CN206556760U CN201621484971.9U CN201621484971U CN206556760U CN 206556760 U CN206556760 U CN 206556760U CN 201621484971 U CN201621484971 U CN 201621484971U CN 206556760 U CN206556760 U CN 206556760U
- Authority
- CN
- China
- Prior art keywords
- raman amplifier
- wave multiplexer
- optical fiber
- sensing system
- detection range
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Lasers (AREA)
Abstract
The utility model discloses a kind of for increasing the raman amplifier of distributed optical fiber vibration sensing system detection range, including raman amplifier, it is characterized in that distributed optical fiber vibration sensing system includes light-pulse generator, the first end connection of the light-pulse generator and circulator, second end of circulator is connected with the output end of the first wave multiplexer, the raman amplifier is connected with an input of the first wave multiplexer, the raman amplifier includes the second wave multiplexer, the input of second wave multiplexer is connected with the output end of several high power semi-conductor pump light sources, the output end of second wave multiplexer is connected with the input of the first wave multiplexer.The utility model has the advantage of raman amplifier is integrated into original DVS systems, the effective detection range of system is significantly improved；So as to reduce equipment cost, and construction and maintenance cost.
Description
Technical field
The utility model is related to distributed optical fiber vibration sensing system, more particularly to one kind is shaken for increasing distribution type fiber-optic
The raman amplifier of dynamic sensor-based system detection range.
Background technology
Distributed optical fiber vibration sensing system（DVS）Based on the optical time domain reflection with phase information（Ф-OTDR）Technology, with
G652 single-mode fibers are sensor information.The pulse laser of laser transmitting narrow linewidth is transmitted along sensor fibre, while constantly producing
The Rayleigh scattering light transmitted backward, and multiple-beam interference occurs for these Rayleigh scattering lights.When sensor fibre is vibrated by the external world
During interference, Rayleigh scattering light phase dorsad can change, and cause the intensity distribution of multiple-beam interference to change.Photoelectricity
Conversion equipment detects the change of these interference light intensities distribution, and is demodulated into vibration signal.Shaken here it is DVS can detect the external world
Dynamic the reason for.
Pulse laser can gradually be decayed when being transmitted along optical fiber, cause the Rayleigh scattering luminous intensity returned to increase with transmission range
And gradually weaken.When transmission range increases to a limiting value, the Rayleigh scattering luminous intensity of return is very faint, so that it cannot
Distinguished with ambient noise, then the vibration signal of this distance can not be detected.Therefore, the list of the like product in current industry
Passage effective detection range is substantially all within 25 kilometers.
And for the engineering project of some a wide range of, long ranges, this effective detection range is difficult to meet application.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of for increasing distributed optical fiber vibration sensing system
The raman amplifier of detection range, can increase distributed optical fiber vibration sensing system detection range.
In order to solve the above problems, the utility model is realized by following scheme：One kind is used to increase distributed light
The raman amplifier of fine vibration sensing system detection range, including raman amplifier, it is characterised in that distributed optical fiber vibration is passed
Sensing system includes light-pulse generator, and the first end of the light-pulse generator and circulator is connected, the second end and the first multiplex of circulator
The output end connection of device, the raman amplifier is connected with an input of the first wave multiplexer, the first wave multiplexer it is another defeated
Enter end to be connected with test optical fibre cables, the 3rd end of circulator then successively with erbium-doped fiber amplifier, wave filter, adjustable optical attenuator mould
Block and the connection of APD circuits, the raman amplifier include the second wave multiplexer, and the input of second wave multiplexer is big with several
The output end connection of power semiconductor pump light source, the output end of the second wave multiplexer is connected with the input of the first wave multiplexer.
According to preferred embodiment of the present utility model, isolator is additionally provided between the second wave multiplexer and test optical fibre cables.
According to preferred embodiment of the present utility model, the length of the test optical fibre cables is preferably 40 ~ 50km.
According to preferred embodiment of the present utility model, the light-pulse generator includes continuous wave laser source, the sound being sequentially connected
Optical modulator, erbium-doped fiber amplifier, wave filter, the output end of the wave filter are connected with circulator.
Raman amplifier is fused in sensor fibre by the utility model by wave multiplexer, because of stimulated Raman scattering and incidence
The transmission direction of light is unrelated, therefore the pulse laser and reverse Rayleigh scattering light in sensor fibre all obtain distributed air-defense.This reality
Distributed air-defense done to the light signal strength transmitted in optical fiber by raman amplifier with new, with the transmission of this compensated optical signal
Decay, so as to increase DVS effective detection range.In the engineering project of long range（Such as anti-intrusion along oil pipeline, high ferro）
Using when, single DVS detection range is bigger, and the DVS host numbers of requirement of engineering are fewer.So as to reduce equipment cost,
And construction and maintenance cost.
The utility model has the advantage of raman amplifier is integrated into original DVS systems, system is significantly improved
Effective detection range；Raman amplifier is modular, it is easy to integrated, and system other parts keep constant, thus is modified to
This is small, and technical risk is low；Optical system after improvement does distributed air-defense to flashlight, helps to suppress various non-in optical fiber
Linear effect, so as to improve the signal to noise ratio of system.
Brief description of the drawings
Fig. 1 is Raman amplifier structure schematic diagram.
Fig. 2 is the DVS optical structure charts after the utility model is improved.
Fig. 3 is that DVS the vibration signal figure not detected during integrated raman amplifier.
Fig. 4 is the vibration signal figure that detects after the integrated raman amplifiers of DVS.
Embodiment
The main composition of raman amplifier has：High power semi-conductor pump light source (LD), wave multiplexer (WDM), isolator
(ISO) etc..Fig. 1 is Raman amplifier structure schematic diagram.The raman amplifier includes the first wave multiplexer, first wave multiplexer
Input be connected with the output end of several high power semi-conductor pump light sources, the output end of the first wave multiplexer and the second multiplex
The input connection of device, the input of the second wave multiplexer is connected with fiber-optic signal input, and the output end of the second wave multiplexer is letter
Number output end, the fiber-optic signal input is additionally provided with isolator.
In optical medium, sub-fraction incident power is transferred to another longer wavelengths of light by the shorter pump light of wavelength
Beam, the difference of the two wavelength is determined that this process is referred to as stimulated raman scattering by the vibration mode of medium.In quantum mechanics
In, it is another low frequency photon that this process, which can be described as a photon of incident light wave by medium molecule scattering, is referred to as this
The frequency displacement light of lentor ripple (Stokes), remaining energy is by medium with molecular vibration（Optical phonon）Form absorb, complete
Transition between vibrational state.Or one phonon of a photonic absorption, produce another high frequency photon, referred to as anti-Stokes light
Ripple (anti-Stokes).
Raman amplifier utilizes stimulated raman scattering, and the part energy of the shorter pump light of wavelength is transferred into light
The flashlight transmitted in fibre, to offset the signal optical attenuation that optical fiber is caused in itself.
Raman amplifier is using Transmission Fibers as gain media, to flashlight distributed air-defense, with simple in construction, Yi Yuxian
Have the advantages that system is blended.With erbium-doped fiber amplifier（EDFA）Concentrate amplification form different etc. discrete, distributed air-defense
The various non-linear phenomenas in optical fiber can be suppressed to greatest extent, system noise is reduced.
Fig. 2 is a kind of distributed optical fiber vibration sensing system, and distributed optical fiber vibration sensing system includes what is be sequentially connected
Continuous wave laser source 1, acousto-optic modulator 2, erbium-doped fiber amplifier 3, wave filter 4, the output end and circulator of the wave filter 4
6 first end connection, it is characterised in that the second end of circulator 6 is connected with the output end of the first wave multiplexer 7, the first wave multiplexer 7
An input be connected with raman amplifier 8, external 40 ~ 60 kilometers of long test lights of another input of the first wave multiplexer 7
Cable 9, the 3rd end of circulator 6 then successively with erbium-doped fiber amplifier 10, wave filter 11, adjustable optical attenuator module 12 and APD
Circuit 13 is connected.APD is that each module is prior art in avalanche photodide, the utility model, be will not be repeated here.
Raman amplifier is fused in sensor fibre by the utility model by wave multiplexer, because of stimulated Raman scattering and incidence
The transmission direction of light is unrelated, therefore the pulse laser and reverse Rayleigh scattering light in sensor fibre all obtain distributed air-defense.
Before and after integrated raman amplifier, following test has been done to DVS systems：Single channel accesses nearly 41 kilometers of long a roll
Sensor fibre（Bare fibre）, this roll of sensor fibre is gently patted, then whole 41 kilometers of long scopes of passage all generate vibration,
Vibration signal is observed with DVS software kits（Energy curve figure）.
Fig. 3 shows the vibration signal of the whole passage when not having integrated raman amplifier（Spatial resolution is in figure
10m/Point, therefore 4000 Points correspondence length distances are 40 kilometers）, it can be seen that the vibration letter of DVS detections relatively distal end
It is number very faint.In this case, the intrusion event of distal end is difficult to be detected.
Fig. 4 shown under the conditions of same test, the vibration letter detected after DVS system integrations raman amplifier
Number.Comparison diagram 3 it can be seen that, now the vibration signal of distal end, which has, significantly increases, and illustrates flashlight whole 41 kilometers long
Substantially do not weaken when being transmitted in optical fiber, i.e., raman amplifier compensate for the decay that optical fiber is caused.In this case, system is held very much
Easily detect the intrusion event of channel distal end generation.
Above content is to combine specific preferred embodiment further detailed description of the utility model, it is impossible to
Assert that the utility model specific implementation is confined to these above-mentioned explanations.For the common skill of the utility model art
For art personnel, without departing from the concept of the premise utility, some simple deduction or replace can also be made, all should
It is considered as belonging to protection domain of the present utility model.
Claims (2)
1. a kind of be used to increase the raman amplifier of distributed optical fiber vibration sensing system detection range, including raman amplifier,
It is characterized in that distributed optical fiber vibration sensing system includes light-pulse generator, the first end of the light-pulse generator and circulator connects
Connect, the second end of circulator is connected with the output end of the first wave multiplexer, one of the raman amplifier and the first wave multiplexer is defeated
Enter end connection, another input of the first wave multiplexer is connected with test optical fibre cables, the 3rd end of circulator then successively with Er-doped fiber
Amplifier, wave filter, adjustable optical attenuator module and the connection of APD circuits, the raman amplifier includes the second wave multiplexer, described
The input of second wave multiplexer is connected with the output end of several high power semi-conductor pump light sources, the output end of the second wave multiplexer
It is connected with the input of the first wave multiplexer.
2. a kind of be used to increase the raman amplifier of distributed optical fiber vibration sensing system detection range, it is characterised in that second
Isolator is additionally provided between wave multiplexer and test optical fibre cables.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621484971.9U CN206556760U (en) | 2016-12-31 | 2016-12-31 | Raman amplifier for increasing distributed optical fiber vibration sensing system detection range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621484971.9U CN206556760U (en) | 2016-12-31 | 2016-12-31 | Raman amplifier for increasing distributed optical fiber vibration sensing system detection range |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206556760U true CN206556760U (en) | 2017-10-13 |
Family
ID=60359552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621484971.9U Expired - Fee Related CN206556760U (en) | 2016-12-31 | 2016-12-31 | Raman amplifier for increasing distributed optical fiber vibration sensing system detection range |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206556760U (en) |
-
2016
- 2016-12-31 CN CN201621484971.9U patent/CN206556760U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106441447B (en) | Distributed optical fiber sensing system based on chaos Brillouin's dynamic raster | |
| CN102226703B (en) | Distributed fiber multi-parameter sensor and multi-parameter measuring method | |
| CN105136178B (en) | The distribution type optical fiber sensing equipment and method of the relevant domain analysis of chaos Brillouin light | |
| CN105136177B (en) | The distribution type optical fiber sensing equipment and method of a kind of submillimeter spatial resolution | |
| Wang et al. | Long-range and high-precision correlation optical time-domain reflectometry utilizing an all-fiber chaotic source | |
| CN106595776B (en) | A kind of more physical quantity sensor-based systems of distribution type fiber-optic and method | |
| Zornoza et al. | Long-range hybrid network with point and distributed Brillouin sensors using Raman amplification | |
| CN105675031A (en) | Pre-pumped pulse and Gray code based BOTDA (Brillouin Optical Time Domain Analysis) instrument | |
| CN103152097A (en) | Long-distance polarization and phase-sensitive optical time domain reflectometer amplified by random laser | |
| GB2500484A (en) | Apparatus and methods utilizing optical sensors operating in the reflection mode | |
| CN107543567A (en) | BOCDA distribution type optical fiber sensing equipments and method based on the modulation of physical accidental code | |
| CN104111086B (en) | Apparatus and method based on the optical time domain reflectometer of low Brillouin scattering threshold-sensitive optical fiber | |
| CN113758509B (en) | Temperature, strain and vibration integrated optical fiber sensing device | |
| CN204087417U (en) | Temperature detected by optical fiber fire detector system | |
| CN112038878B (en) | Distributed optical fiber acoustic wave sensing system based on far pump amplifier and Raman amplifier | |
| CN102072741A (en) | Ultra-long distance distribution type optical fiber sensor and using method thereof | |
| CN102564481A (en) | Method and device for improving signal-to-noise ratio of distributed optical fiber Brillouin sensor | |
| CN202041323U (en) | Distributed multi-parameter optical fiber sensor | |
| CN206523220U (en) | A kind of distributed optical fiber vibration sensing system | |
| CN104361707A (en) | Fiber-optic temperature-sensing fire detector system | |
| CN107817362B (en) | Miniature wind speed sensor and distributed wind speed detection device based on sensor | |
| CN103376124A (en) | Brillouin optical time domain analyzer | |
| CN206556760U (en) | Raman amplifier for increasing distributed optical fiber vibration sensing system detection range | |
| CN102564642A (en) | Fully-distributed optical fiber sensor for optical fiber Raman frequency shifter fused with Raman amplification effect | |
| CN206523221U (en) | A kind of distributed optical fiber vibration sensing system of two detection channels |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171013 Termination date: 20211231 |