CN209446189U - A kind of distribution single mode optical fiber extra long distance Raman temperature transducer - Google Patents
A kind of distribution single mode optical fiber extra long distance Raman temperature transducer Download PDFInfo
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- CN209446189U CN209446189U CN201920244949.4U CN201920244949U CN209446189U CN 209446189 U CN209446189 U CN 209446189U CN 201920244949 U CN201920244949 U CN 201920244949U CN 209446189 U CN209446189 U CN 209446189U
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- optical fiber
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Abstract
It is related to the distributed single mode optical fiber extra long distance Raman temperature transducer of optical field the utility model discloses a kind of, include laser and waveform generator, laser is connect with switch type semiconductor light amplifier, waveform generator connection switch type semiconductor optical amplifier, the connection of the input terminal of switch type semiconductor light amplifier output end and EDFA Erbium-Doped Fiber Amplifier, the output end of EDFA Erbium-Doped Fiber Amplifier and the input terminal of fiber grating filter connect, using larger optical power laser, by the dual amplification of switch type semiconductor light amplifier and EDFA Erbium-Doped Fiber Amplifier, extinction ratio with superelevation, by filtering outside fiber grating filter bandwidth and being filtered in Mach-Zehnder modulators bandwidth, significantly improve the signal-to-noise ratio of light pulse, it can be used for detecting single mode optical fiber, the detection range of single mode optical fiber 30km may be implemented, system System installation is simple, it is easy to accomplish the accurate thermometric of extra long distance, and do not rung by optical fiber strain shadow.
Description
Technical field
The utility model relates to a kind of optical field, specifically a kind of distribution single mode optical fiber extra long distance Raman thermometric is passed
Sensor.
Background technique
Optical fiber is both information transmitting medium and sensing unit in Distributed Optical Fiber Sensing Techniques, and distributed Raman temperature passes
Sense technology is the optical fiber sensing technology for real-time measurement thermo parameters method, based on the anti-Stokes (Anti- in Raman scattering
Stokes) light is temperature sensitive, but Stokes (Stokes) light can measure entirely temperature-insensitive with the attribute
Profiling temperatures on fiber lengths.Existing distributed optical fiber temperature sensor is situated between using multimode fibre as sensing mostly
Matter, but since the dispersion mode of multimode fibre limits the raising of System spatial resolution.
The one kind of distribution as unimodal formula Raman temperature transducers technology as Distributed Optical Fiber Sensing Techniques is different from traditional more
Mould distributed Raman temperature transducers technology, the difficult point of measurement essentially consist in the detection to small-signal, and ultra long haul difficult to realize
From distributed temperature monitoring, current distributed Raman temperature transducers technology such as notification number be 105910728 B of CN application
A kind of high spatial resolution Raman temperature transducer and temp measuring method are disclosed, the application that notification number is 108020345 A of CN is public
A kind of distributed fiber temperature measuring device etc. based on single mode optical fiber Raman scattering effect is opened, these current systems all cannot be same
Shi Shixian single mode optical fiber sensing, extra long distance monitoring, the measurement of accurate temperature.
Utility model content
The purpose of this utility model is to provide a kind of distributed single mode optical fiber extra long distance Raman temperature transducers, with solution
Certainly the problems mentioned above in the background art.
To achieve the above object, the utility model provides the following technical solutions:
A kind of distribution single mode optical fiber extra long distance Raman temperature transducer, including laser and waveform generator, it is described
The output end of laser and the input terminal of switch type semiconductor light amplifier connect, and the waveform generator connection switch type is partly led
The input terminal of body image intensifer, the switch type semiconductor light amplifier output end and EDFA Erbium-Doped Fiber Amplifier connects, described to mix
The input terminal of the output end of bait fiber amplifier and fiber grating filter connects, the output end of the fiber grating filter with
The input terminal of Mach-Zehnder modulators connects, and the output end of the Mach-Zehnder modulators passes through coupler connection one
Number optical fibre wavelength division multiplexer and No. two optical fibre wavelength division multiplexers, the No.1 optical fibre wavelength division multiplexer and No. two optical fibre wavelength-division multiplexes
The output port of device is connect with the input terminal of No.1 optical fiber filter and No. two optical fiber filters respectively, the No.1 optical fiber filtering
The output port of device and No. two optical fiber filters is connect with the input port of No.1 detector and No. two detectors respectively, and described one
The output port of number detector and No. two detectors is all connected with two-way amplifying circuit, and the two-way amplifying circuit is adopted by two channels
Truck connects computer.
As a further solution of the present invention: the coupler is equipped with an input port and three output ports,
The input port of coupler connects Raman Back Scattering light occurring source, and the first output port of the coupler connects single-mode optics
Fibre, the second output terminal mouth and third output port of coupler are separately connected No.1 optical fibre wavelength division multiplexer and No. two optical fiber wavelength divisions
Multiplexer.
The waveform generator is connect with Mach-Zehnder modulators as a further solution of the present invention,.
The waveform generator connects computer as a further solution of the present invention,.
The laser is narrow linewidth superpower laser as a further solution of the present invention,.
The extinction ratio of the Mach-Zehnder modulators is greater than 30dBm as a further solution of the present invention,.
The waveform generator, which is set, as a further solution of the present invention, generates electric impulse signal there are two synchronous
Channel.
The No.1 optical fiber filter and No. two optical fiber filters are as a further solution of the present invention,
1450nm optical fiber filter and 1663nm optical fiber filter.
The No.1 optical fiber filter and No. two optical fiber filters are as a further solution of the present invention,
The single mode optical fiber wavelength division multiplexer of 1450nm and the single mode optical fiber wavelength division multiplexer of 1663nm.
Compared with prior art, the utility model has the beneficial effects that using larger optical power laser, by switching mode
The dual amplification of semiconductor optical amplifier and EDFA Erbium-Doped Fiber Amplifier can make the peak-to-peak value function for injecting the light pulse of single mode optical fiber
Rate reaches 34dBm；Extinction ratio with superelevation, by filtering and Mach-Zehnder modulators outside fiber grating filter bandwidth
Filtering, significantly improves the signal-to-noise ratio of light pulse in bandwidth, and the light pulse extinction ratio for injecting single mode optical fiber can be made to reach
70dB；It can be used for detecting single mode optical fiber, the detection range of single mode optical fiber 30km may be implemented, there is ± 1 DEG C of measurement accuracy,
Spatial resolution is 3m；System installation is simple, it is easy to accomplish the accurate thermometric of extra long distance, and do not rung by optical fiber strain shadow,
The utility model structure is simple, practical, easy to use and promote.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of distributed single mode optical fiber extra long distance Raman temperature transducer.
Wherein: wherein: laser 1, switch type semiconductor light amplifier 2 (SOA), EDFA Erbium-Doped Fiber Amplifier 3 (EDFA), light
Fine grating filter 4, Mach-Zehnder modulators 5 (MZM), coupler 6, single mode optical fiber 7, No.1 optical fibre wavelength division multiplexer 8
(WDM1), No. two optical fibre wavelength division multiplexers 9 (WDM2), No.1 optical fiber filter 10, No. two optical fiber filters 11, No.1 detectors
12 (APD1), No. two detectors 13 (APD2), two-way amplifying circuit 14, two channel capture cards 15, computer 16, waveform generator
17(AWG)。
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Embodiment 1:
Referring to Fig. 1, in the utility model embodiment, a kind of distribution single mode optical fiber extra long distance Raman temperature transducers
The output end of device, the laser 1 is connect with the input terminal of switch type semiconductor light amplifier 2, the list exported for laser 1
In frequency continuous laser access switch type semiconductor optical amplifier 2；
The 17 connection switch type semiconductor optical amplifier 2 of waveform generator, the electric arteries and veins exported for waveform generator 17
It rushes in signal loading to switch type semiconductor light amplifier 2, continuous laser is modulated into pulsed light；The waveform generator 17
It is also connect with Mach-Zehnder modulators 5, exports synchronous electric impulse signal for waveform generator 17 and be loaded into Mach-Zehnder
That modulator 5, generates synchronous light pulse signal.
2 output end of switch type semiconductor light amplifier is connect with the input terminal of EDFA Erbium-Doped Fiber Amplifier 3, is used for pulse
The amplification of optical power.
The output end of the EDFA Erbium-Doped Fiber Amplifier 3 is connect with the input terminal of fiber grating filter 4, for filtering out filtering
Noise outside device bandwidth, to improve signal-to-noise ratio.
The output end of the fiber grating filter 4 is connect with the input terminal of Mach-Zehnder modulators 5, for eliminating
Noise in bandwidth obtains the light pulse signal of High Extinction Ratio.
The output end of the Mach-Zehnder modulators 5 is connect with the input terminal of coupler 6, and the coupler is equipped with one
The input port of a input port and three output ports, coupler connects Raman Back Scattering light occurring source, dissipates backwards to Raman
It penetrates light to input by 6 input port of coupler, the first output port of the coupler 6 connects single mode optical fiber 7, coupler 6
Second output terminal mouth and third output port are separately connected No.1 optical fibre wavelength division multiplexer 8 and No. two optical fibre wavelength division multiplexers 9, lead to
6 first output port of overcoupling device injects pulsed light in single mode optical fiber 7, and second output terminal mouth is connected with third output port
No.1 optical fibre wavelength division multiplexer 8 and No. two optical fibre wavelength division multiplexers 9, for by stokes light Stokes and anti-Stokes
Light Anti-Stokes is separated.
8 output port of No.1 optical fibre wavelength division multiplexer and No. two 9 output ports of optical fibre wavelength division multiplexer are respectively with one
Number optical fiber filter 10 is connected with the input terminal of No. two optical fiber filters 11, for filtering out stokes light Stokes and this anti-support
The white noise of Ke Si light Anti-Stokes, and improve the inhibition ratio of sideband.
The output port of the No.1 optical fiber filter 10 and No. two optical fiber filters 11 respectively with No.1 detector 12
The input port of input port and No. two detectors 13 connection, for converting optical signal into electric signal.
The input port of the No.1 detector 12 and the output port of No. two detectors 13 are all connected with two-way amplifying circuit
14, the amplification for faint electric signal.
The output end of the two-way amplifying circuit 14 is connect with the input terminal of two channel capture cards 15, is used for two path signal
Acquisition, two channel capture card 15 connects computer 16 by cable, and for the transmission of data, waveform generator 17 is connected
Computer 16, computer 16 control waveform generator 17 by cable, it is made to control the output of 17 pulse of waveform generator.
Specifically, the laser 1 is narrow linewidth superpower laser, can ensure the propagation of optical signal long range.
Specifically, the Mach-Zehnder modulators 5, extinction ratio need to reach 30dBm or more.
Specifically, the waveform generator 17 is set there are two channel, generates two synchronous electric impulse signals, to guarantee to add
It is loaded in the synchronism of the light pulse of switch type semiconductor light amplifier 2 and Mach-Zehnder modulators 5.
Specifically, the No.1 optical fiber filter 10 and No. two optical fiber filters 11 be 1450nm optical fiber filter and
The single mode optical fiber wavelength division multiplexer of the single mode optical fiber wavelength division multiplexer and 1663nm of 1663nm optical fiber filter or 1450nm, with
Equally play the role of promoting sideband inhibition ratio.
Embodiment 2:
The distribution single mode optical fiber extra long distance Raman Temperature detecting sensor, when specific operation the following steps are included:
Step 1: the light of laser 1 enters in switch type semiconductor light amplifier 2, it is modulated into the pulsed light of amplification；
Step 2: pulsed light is amplified by EDFA Erbium-Doped Fiber Amplifier 3；
Step 3: the pulsed light of amplification is carried out noise filtering outside bandwidth by fiber grating filter 4；
Step 4: the noise in bandwidth is filtered by Mach-Zehnder modulators 5, while improving signal-to-noise ratio；
Step 5: entering single mode sensor fibre by the first output port of coupler 6 again；
Step 6: Raman scattering signal backwards is inputted by the input port of coupler 6, pass through second port and third
Port is exported；
Step 7: by No.1 optical fibre wavelength division multiplexer 8 and No. two optical fibre wavelength division multiplexers 9, by stokes light and anti-
Stokes light is separated；
Step 8: carrying out noise filtering by No.1 optical fiber filter 10 and No. two optical fiber filters 11 again；
Step 9: using No.1 detector 12 and No. two detectors 13 respectively, optical signal is converted to electric signal；
Step 10: carrying out the amplification of Raman electric signal by two-way amplifying circuit 14；
Step 11: carrying out the acquisition of signal by two channel capture cards 15；
Data are carried out Step 12: the collected data of two channel capture card 15 are transferred in computer 16 by cable
Processing.
The distribution single mode optical fiber extra long distance Raman Temperature detecting sensor, using larger optical power laser, warp
The dual amplification of switch type semiconductor light amplifier and EDFA Erbium-Doped Fiber Amplifier is crossed, the light pulse for injecting single mode optical fiber can be made
Peak-to-peak value power reaches 34dBm；Extinction ratio with superelevation, by filtering and Mach-Zehnder outside fiber grating filter bandwidth
Filtering in your modulator bandwidth, significantly improves the signal-to-noise ratio of light pulse, can make the light pulse delustring for injecting single mode optical fiber
Than reaching 70dB；It can be used for detecting single mode optical fiber, the detection range of single mode optical fiber 30km may be implemented, with ± 1 DEG C of survey
Accuracy of measurement, spatial resolution 3m；System installation is simple, it is easy to accomplish the accurate thermometric of extra long distance, and do not answered by optical fiber
Becoming influences.
It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and
And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this is practical new in other specific forms
Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this is practical new
The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in
All changes in justice and range are embraced therein.It should not treat any reference in the claims as limiting
Related claim.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (9)
1. a kind of distribution single mode optical fiber extra long distance Raman temperature transducer, including laser (1) and waveform generator (17),
It is characterized in that, the output end of the laser (1) is connect with the input terminal of switch type semiconductor light amplifier (2), the wave
Shape generator (17) connection switch type semiconductor optical amplifier (2), switch type semiconductor light amplifier (2) output end with mix
The input terminal of bait fiber amplifier (3) connects, the output end of the EDFA Erbium-Doped Fiber Amplifier (3) and fiber grating filter (4)
Input terminal connection, the output end of the fiber grating filter (4) connect with the input terminal of Mach-Zehnder modulators (5),
The output end of the Mach-Zehnder modulators (5) passes through coupler (6) connection No.1 optical fibre wavelength division multiplexer (8) and No. two
Optical fibre wavelength division multiplexer (9), the output port of the No.1 optical fibre wavelength division multiplexer (8) and No. two optical fibre wavelength division multiplexers (9)
It is connect respectively with the input terminal of No.1 optical fiber filter (10) and No. two optical fiber filters (11), the No.1 optical fiber filter
(10) and the input with No.1 detector (12) and No. two detectors (13) respectively of the output port of No. two optical fiber filters (11)
The output port of port connection, the No.1 detector (12) and No. two detectors (13) is all connected with two-way amplifying circuit (14),
The two-way amplifying circuit (14) passes through two channel capture cards (15) connection computer (16).
2. distribution single mode optical fiber extra long distance Raman temperature transducer according to claim 1, which is characterized in that described
Coupler is equipped with an input port and three output ports, and the input port connection Raman Back Scattering light of coupler occurs
First output port in source, the coupler (6) connects single mode optical fiber (7), and the second output terminal mouth and third of coupler (6) are defeated
Exit port is separately connected No.1 optical fibre wavelength division multiplexer (8) and No. two optical fibre wavelength division multiplexers (9).
3. distribution single mode optical fiber extra long distance Raman temperature transducer according to claim 1, which is characterized in that described
Waveform generator (17) is connect with Mach-Zehnder modulators (5).
4. distribution single mode optical fiber extra long distance Raman temperature transducer according to claim 1, which is characterized in that described
Waveform generator (17) connects computer (16).
5. distribution single mode optical fiber extra long distance Raman temperature transducer according to claim 1, which is characterized in that described
Laser (1) is narrow linewidth superpower laser.
6. distribution single mode optical fiber extra long distance Raman temperature transducer according to claim 1, which is characterized in that described
The extinction ratio of Mach-Zehnder modulators (5) is greater than 30dBm.
7. distribution single mode optical fiber extra long distance Raman temperature transducer according to claim 3, which is characterized in that described
Waveform generator (17) synchronizes the channel for generating electric impulse signal there are two setting.
8. distribution single mode optical fiber extra long distance Raman temperature transducer according to claim 1, which is characterized in that described
No.1 optical fiber filter (10) and No. two optical fiber filters (11) are 1450nm optical fiber filter and 1663nm optical fiber filter.
9. distribution single mode optical fiber extra long distance Raman temperature transducer according to claim 1, which is characterized in that described
The single mode optical fiber wavelength division multiplexer and 1663nm that No.1 optical fiber filter (10) and No. two optical fiber filters (11) are 1450nm
Single mode optical fiber wavelength division multiplexer.
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