CN104949698A - Radial pipe network monitoring system and method - Google Patents
Radial pipe network monitoring system and method Download PDFInfo
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Abstract
Disclosed in the invention is a radial pipe network monitoring system comprising a broad-band laser light source (1), an optical fiber coupler (2), a first optical fiber reflective device (3), an optical fiber delay coil (4), a second optical fiber reflective device (5), a first phase modulator (6), a second phase modulator (7), a first optical fiber splitter (8), a second optical fiber splitter (9), a wavelength division multiplexer (10), a light receiving device (11), and a collector and computer (12). The second optical fiber reflective device (5), the optical fiber delay coil (4), and the optical fiber coupler (2) are successively connected in sequence. With the system and method, a problem that the existing fiber sensing monitoring host applied to a long-distance pipeline is only capable of monitoring a unidirectional one-path or bidirectional two-path pipelines and can not monitor the radial urban underground pipe network in a spider thread shape simultaneously can be solved.
Description
Technical field
The invention belongs to underground pipe network safety monitoring technology, be specifically related to a kind of Distributed Optical Fiber Sensing Techniques and be applied to underground pipe network monitoring.
Background technology
Along with the fast development of China's urban infrastructure, the scale amounts of underground utilities sharply increases, according to statistics, and only nearly 50,000 kilometers of China Tianjin underground utilities total length, this length be equivalent to around the earth one enclose more than, the underground utilities length of whole country reaches surprising stage especially.In recent years because artificial destruction or third party's construction cause underground utilities security incident constantly to occur, serious adverse effect and loss is brought to people's lives and national wealth, national security supervision general bureau is sent the documents again and again require to strengthen safety monitoring early warning gordian technique, the safety management of underground pipelines intentinonally.
Still few in number for the effective technology means of underground pipe network safety monitoring at present, mainly contain infrared heat sensing imaging technique, ultrasonic guided wave detecting system, based on the wireless sensing monitoring system of RFID technique.Wherein infrared heat sensing imaging technique, ultrasonic guided wave detecting system is all a kind of line walking detection means, can not accomplish Real-Time Monitoring, and this kind equipment is mostly import equipment, and price is very expensive; Wireless sensing monitoring system based on RFID technique is subject to the impact of underground utilities complexity, as buried pipe linear light kind just divides all kinds such as draining, power supply, draining, electric power, communication, combustion gas, oil transportation, heating power, CATV (cable television), the buried depth of each pipeline, medium, installation environment are all not quite similar, thus the safety monitoring of RFID wireless sensor technology a certain class pipeline under can only being applicable to some environment, its application is subject to larger restriction.
In recent years along with the development of optical fiber sensing technology, its application progressively extends to the safety monitoring of underground utilities.In prior art, patent CN1932369 (application number 200610113044.0), is applied to the safety monitoring of long-distance oil & gas pipeline by optical fiber sensing technology.Because fiber optic materials is glass, corrosion-resistant, electromagnetism interference, is suitable for applying under inflammable and explosive, the humidity rugged surroundings such as under water, is easy to networking, thus almost can be suitable for the underground pipeline monitoring of often kind of environmental form.But the existing optical fiber sensing monitoring main frame being applied to long-distance pipeline is generally equal can only monitor unidirectional 1 road pipeline or two-way 2 road pipelines, the Urban Buried Pipeline Network of simultaneously monitoring spider's thread shape radially cannot be accomplished, limitation is very large, counter-measure is generally increase host number, and this makes cost significantly rise undoubtedly.
Summary of the invention
The present invention proposes a kind of radial pipe network monitoring system and method, solve that the existing optical fiber sensing monitoring main frame being applied to long-distance pipeline is generally equal can only monitor unidirectional 1 road or two-way 2 road pipelines, the problem of the Urban Buried Pipeline Network of simultaneously monitoring spider's thread shape radially cannot be accomplished, realize the object of simultaneously monitoring radial multichannel underground utilities.
Technical solution of the present invention is as follows:
A kind of radial pipe network monitoring system, comprises broad band laser light source (bandwidth is at more than 40nm), fiber coupler, the first fiber reflection device, optical fiber delay coil, the second fiber reflection device, first phase modulator, second phase modulator, the first optical fiber splitter, the second optical fiber splitter, wavelength division multiplexer, optical pickup apparatus, collector and computing machine;
Second fiber reflection device, optical fiber delay coil, fiber coupler are linked in sequence successively, broad band laser light source, the first fiber reflection device, first phase modulator, second phase modulator, wavelength division multiplexer are all connected with fiber coupler, collector and computing machine are connected with wavelength division multiplexer by optical pickup apparatus, and first phase modulator, second phase modulator are connected with the first optical fiber splitter, the second optical fiber splitter respectively;
First optical fiber splitter, the second optical fiber splitter connect several fiber gratings respectively.All Fiber connection is passed through between the equipment of radial pipe network monitoring system.
A kind of radial pipe network monitoring system, broad band laser light source is ASE light source.
The number of the fiber grating be connected with the first optical fiber splitter is n, and the number of the fiber grating be connected with the second optical fiber splitter is N; Wavelength division multiplexer output terminal quantity is m, then m=max (n, N), n and N value can be equal, also can be unequal; The individual fiber grating reflection kernel wavelength that each fiber grating reflection kernel wavelength that optical fiber splitter is corresponding is corresponding with optical fiber splitter can be the same, also can be different.Wherein, m, n, N are natural number, are generally less than 18.
It is tapered that fiber coupler is that 3*3 once draws, can power-sharing.
First optical fiber splitter, the second optical fiber splitter are PLC type.
A kind of radial pipe network monitoring method, comprises the following steps,
S1, the continuous light in broad band laser light source incides in fiber coupler, K (bar) the light path approach of formation;
S2, each wavelength port of the corresponding wavelength division multiplexer of every bar light path approach, the flashlight of each wavelength port outgoing is amplified into the acquisition channel of corresponding collector through optical pickup apparatus 11, define all pipeline orders of monitoring according to acquisition channel numbering;
S3, only have two row light wave frequencies identical, constant phase difference, the coherent source that direction of vibration is consistent, could produce the interference of light.Owing to adopting wideband A SE light source, bandwidth is at more than 40nm, therefore coherent length is extremely short, is grade, then K bar light path is not any two and can forms interference, more impossible formation multiple-beam interference above.Can produce the light path approach of effectively interfering in K kind light path approach is L kind, to the real-time change function of the light path approach calculating light intensity that L kind is effectively interfered;
If laser incident power is P
0, consider the insertion loss of optical device and the attenuation loss of optical fiber, if total attenuation parameter is a, because optical pickup apparatus can filter interference light intensity DC quantity, then the interference light intensity of ac formed is:
P(t)＝aP
0{cos[Δφ(t)+φ
0]-cos(φ
0)}
Wherein, phase bias amount φ
0be that the characteristic of 3*3 coupling mechanism causes, be about 120 °;
Wherein, Δ φ (t) is the interference of light phase differential that elasto-optical effect that the disturbance of outer bound pair optical fiber causes causes, and interference of light phase difference φ (t) is the function changed according to time t;
for instantaneous phase rate of change, n is optical fibre refractivity, and l is optical fiber delay coil length, and c is the light velocity; Then, the disturbance of outer bound pair optical fiber can cause the superpower real-time change of interference light;
S4, using the foundation of interference of light phase difference φ (t) as disturbance around Real-Time Monitoring pipeline environments.
Owing to have employed phase modulation and demodulation of interferometric, not only the line areas through first phase modulator and second phase modulator can be separated, and Δ φ (t) of reflection disturbing source feature can be calculated, thus provide foundation for the pattern-recognition of signal; In addition due to each wavelength port of the corresponding wavelength division multiplexer of every bar circuit, the acquisition channel of flashlight corresponding collector after optical pickup apparatus amplifies of each wavelength port outgoing, therefore all pipeline orders that finally can define monitoring according to acquisition channel numbering.
Compared with prior art, the present invention includes following beneficial effect:
1, solve that the existing optical fiber sensing monitoring main frame being applied to long-distance pipeline is generally equal can only monitor unidirectional 1 road or two-way 2 road pipelines, the problem of the Urban Buried Pipeline Network of simultaneously monitoring spider's thread shape radially cannot be accomplished;
2, common outdoor communication optical cable can be adopted as sensor information, while reducing costs, the installation environment of the City Buried Pipeline of nearly all type can be adapted to;
3, two sense outputs owing to have employed phase generated carrier modulation and demodulation technology fiber coupler are all fully used, and make Monitoring Line quantity add 1 times; And the centre wavelength of two fiber reflection devices (the first fiber reflection device and the second fiber reflection device) corresponding to two of fiber coupler sense outputs can be the same, such two circuits just can share 1 passage of optical pickup apparatus and 1 passage of collector, have significantly saved cost;
4, because two sense outputs of fiber coupler all can connecting fiber shunt again, this is that later number of, lines increases dilatation and leaves sufficient space.
Accompanying drawing explanation
Fig. 1 is a kind of radial pipe network monitoring system architecture schematic diagram of the present invention.
Embodiment
For making object of the present invention, technical scheme, advantage clearly, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Below with reference to accompanying drawing of the present invention; clear, complete description and discussion are carried out to the technical scheme in the embodiment of the present invention; obviously; as described herein is only a part of example of the present invention; it is not whole examples; based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to protection scope of the present invention.
As shown in Figure 1, a kind of radial pipe network monitoring system, comprises broad band laser light source 1 (bandwidth is at more than 40nm), fiber coupler 2, first fiber reflection device 3, optical fiber delay coil 4, second fiber reflection device 5, first phase modulator 6, second phase modulator 7, first optical fiber splitter 8, second optical fiber splitter 9, wavelength division multiplexer 10, optical pickup apparatus 11, collector and computing machine 12; Broad band laser light source 1 is ASE light source.
Second fiber reflection device 5, optical fiber delay coil 4, fiber coupler 2 are linked in sequence successively, broad band laser light source 1, first fiber reflection device 3, first phase modulator 6, second phase modulator 7, wavelength division multiplexer 10 are all connected with fiber coupler 2, collector and computing machine 12 are connected with wavelength division multiplexer 10 by optical pickup apparatus 11, and first phase modulator 6, second phase modulator 7 are connected with the first optical fiber splitter 8, second optical fiber splitter 9 respectively.
The distribution terminal of the first optical fiber splitter 8, second optical fiber splitter 9 connects several fiber gratings respectively.First optical fiber splitter 8 connects n fiber grating, and the second optical fiber splitter 9 connects N number of fiber grating.
In accompanying drawing 1, the connecting line of equipment room is optical fiber, fiber form wherein between PLC type first optical fiber splitter 8 to fiber grating 8-1,8-n is outdoor communication optical cable, and the fiber form of broad band laser light source 1 to fiber coupler 2, wavelength division multiplexer 10 to fiber coupler 2 is indoor optical-fibre wire jumper; Dotted portion is cable.
N and N value can be equal, also can be unequal; Wavelength division multiplexer 10 output terminal quantity is m, m=max (n, N); The individual fiber grating reflection kernel wavelength of the 9.1-9.N that each fiber grating reflection kernel wavelength of the 8.1-8.n of optical fiber splitter 8 correspondence is corresponding with optical fiber splitter 9 can be the same, also can be different.N, N, m are natural number, are less than 18.
Fiber coupler 2 once draws tapered for 3*3, can power-sharing.
First fiber reflection device 3, second fiber reflection device 5 is faraday rotator mirror, centre wavelength 1550nm;
Optical fiber delay coil 4 is G652D optical fiber, 5km.
First phase modulator 6, second phase modulator 7 are lithium niobate type, 1550nm wave band, band adjustable frequency drive source.
First optical fiber splitter 8, second optical fiber splitter 9 is PLC type.
Wavelength division multiplexer 10 is DWDM dense wavelength division type.
Optical pickup apparatus 11 is PIN-FET photoelectricity amplifier module.
Collector model in collector and computing machine 12 is the PCI-that America NI company produces, and computing machine is for grinding magnificent industrial computer.
A kind of radial pipe network monitoring method, comprises the following steps,
S1, continuous light in broad band laser light source 1 incides in fiber coupler 2, the K bar light path approach (the present embodiment is 8 light path approach) formed, light path approach following (in the equipment use accompanying drawing 1 in following light path approach, the Reference numeral of equipment represents):
Light path 1:1-2-3-2-4-5-2-6-8-8.1 (... 8.n)-8-6-2-10, wherein 3-2-4-5-2 in theory capable of circulation back and forth many times, owing to decay 4.8dB through fiber coupler 2 luminous power at every turn, so the interference light intensity that the light path back and forth more than 1 time is finally formed can be ignored, namely only discuss 1-2-3-2-4-5-2-6-8-8.1 (... 8.n) the situation of-8-6-2-10; 8.1 (... 8.n) represent n the paths played in the fiber grating of light reflex be connected with the first optical fiber splitter 8 in accompanying drawing 1;
Light path 2:1-2-6-8-8.1 (... 8.n)-8-6-2-4-5-4-2-3-2-10, wherein 4-5-4-2-3-2 in theory capable of circulation back and forth many times, owing to decay 4.8dB through fiber coupler 2 luminous power at every turn, so the interference light intensity that the light path back and forth more than 1 time is finally formed can be ignored, namely only discuss 1-2-6-8-8.1 (... 8.n) the situation of-8-6-2-4-5-4-2-3-2-10;
Light path 3:1-2-3-2-4-5-2-7-8-9.1 (... 9.n)-9-7-2-10, wherein 3-2-4-5-2 in theory capable of circulation back and forth many times, owing to decay 4.8dB through fiber coupler 2 luminous power at every turn, so the interference light intensity that the light path back and forth more than 1 time is finally formed can be ignored, namely only discuss 1-2-3-2-4-5-2-7-9-9.1 (... 9.n) the situation of-8-7-2-10; 9.1 (... 9.n) represent N number of paths played in the fiber grating of light reflex that in accompanying drawing 1, second optical fiber splitter 9 is connected;
Light path 4:1-2-7-9-9.1 (... 9.n)-9-7-2-4-5-4-2-3-2-10, wherein 4-5-4-2-3-2 in theory capable of circulation back and forth many times, owing to decay 4.8dB through fiber coupler 2 luminous power at every turn, so the interference light intensity that the light path back and forth more than 1 time is finally formed can be ignored, namely only discuss 1-2-7-9-9.1 (... 9.n) the situation of-9-7-2-4-5-4-2-3-2-10;
Light path 5:1-2-3-2-10;
Light path 6:1-2-3-2-4-5-4-2-3-2-10, wherein 4-5-4-2-3-2 is back and forth capable of circulation;
Light path 7:1-2-6-8-8.1 (... 8.n)-8-6-2-10;
Light path 8:1-2-7-9-9.1 (... 9.n)-9-7-2-10;
S2, each wavelength port of the corresponding wavelength division multiplexer 10 of every bar light path approach, the flashlight of each wavelength port outgoing is amplified into the acquisition channel of corresponding collector through optical pickup apparatus 11, define all pipeline orders of monitoring according to acquisition channel numbering;
S3, owing to adopting wideband A SE light source, bandwidth is at more than 40nm, therefore coherent length is extremely short, is grade, then 8 light paths are not any two and can form interference, more impossible formation multiple-beam interference above.Can produce the light path approach of effectively interfering in K kind light path approach is L kind (L is less than or equal to K), to the real-time change function of the light path approach calculating light intensity that L kind is effectively interfered; By analysis, only have light path 1 and light path 2, light path 3 and light path 4 to be formed effectively to interfere.Light path 1 and light path 2, light path 3 and light path 4 are made a concrete analysis of as follows.
The optical path analysis of light light path 1 and light path 2 specifically comprises the following steps:
The continuous light sent by broad band laser light source 1 enters into fiber coupler 2 through single-mode fiber, and the light that fiber coupler 2 exports is divided into three tunnels by power 1:1:1.
Wherein 1 tunnel arrives fiber reflection device 3 through single-mode fiber, after fiber reflection device 3 reflects, fiber coupler 2 is back to along single-mode fiber, three tunnels are divided into by power 1:1:1, wherein 1 tunnel arrives fiber reflection device 5 through optical fiber delay coil 4, after fiber reflection device 5 reflects, fiber coupler 2 is arrived through optical fiber delay coil 4 along single-mode fiber, three tunnels are divided into by power 1:1:1, wherein 1 curb single-mode fiber arrives optical fiber splitter 8 through phase-modulator 6, then n road is become to export by power-sharing, the corresponding 1 tunnel monitoring pipeline in each road wherein exported, the fiber grating 8.n (n value is the natural number between 1-18) playing Wavelength selective reflective effect is arrived along sensing single-mode fiber, select each the road optical maser wavelength after reflection all different through fiber grating 8.n, for ease of understanding, we choose the light path that wherein a road is reflected through fiber grating 8.1 and analyze, fiber coupler 2 is arrived after sensing single-mode fiber enters optical fiber splitter 8.
Other 1 curb single-mode fiber arrives optical fiber splitter 8 through phase-modulator 6, then n road is become to export by power-sharing, the corresponding 1 tunnel monitoring pipeline in each road wherein exported, the fiber grating 8.n (n value is the natural number between 1-18) playing Wavelength selective reflective effect is arrived along sensing single-mode fiber, select each the road optical maser wavelength after reflection all different through fiber grating 8.n, for ease of understanding, we choose the light path that wherein a road is reflected through fiber grating 8.1 and analyze, fiber coupler 2 is arrived after sensing single-mode fiber enters optical fiber splitter 8, three tunnels are divided into by power 1:1:1, wherein a curb single-mode fiber arrives fiber reflection device 5 through optical fiber delay coil, after fiber reflection device 5 reflects, fiber coupler 2 is arrived through optical fiber delay coil 4 along single-mode fiber, three tunnels are divided into by power 1:1:1, wherein 1 tunnel arrives fiber reflection device 3 through single-mode fiber, after fiber reflection device 3 reflects, fiber coupler 2 is back to along single-mode fiber.
Above-mentioned two-way light produces at fiber coupler 2 interferes, the interference light formed arrives wavelength division multiplexer 10, optical pickup apparatus 11 is arrived along corresponding demodulation wavelength channel 10.1, optical pickup apparatus 11 photoelectricity is enlarged into analog voltage signal, be input in collector and computing machine 12 through cable and carry out A/D conversion, carry out the real-time analysis of signal backstage and process by computing machine.
Light path 3 and light path 4 analytical procedure as follows:
The continuous light sent by broad band laser light source 1 enters into fiber coupler 2 through single-mode fiber, and the light that fiber coupler 2 exports is divided into three tunnels by power 1:1:1.
Wherein 1 tunnel arrives fiber reflection device 3 through single-mode fiber, after fiber reflection device 3 reflects, fiber coupler 2 is back to along single-mode fiber, three tunnels are divided into by power 1:1:1, wherein 1 tunnel arrives fiber reflection device 5 through optical fiber delay coil 4, after fiber reflection device 5 reflects, fiber coupler 2 is arrived through optical fiber delay coil 4 along single-mode fiber, three tunnels are divided into by power 1:1:1, wherein 1 curb single-mode fiber arrives optical fiber splitter 9 through phase-modulator 7, then n road is become to export by power-sharing, the corresponding 1 tunnel monitoring pipeline in each road wherein exported, the fiber grating 9.N (N value is the natural number between 1-18) playing Wavelength selective reflective effect is arrived along sensing single-mode fiber, select each the road optical maser wavelength after reflection all different through fiber grating 9., for ease of understanding, we choose the light path that wherein a road is reflected through fiber grating 9.1 and analyze, fiber coupler 2 is arrived after sensing single-mode fiber enters optical fiber splitter 9.
Other 1 curb single-mode fiber arrives optical fiber splitter 8 through phase-modulator 6, then n road is become to export by power-sharing, the corresponding 1 tunnel monitoring pipeline in each road wherein exported, the fiber grating 9.N (N value is the natural number between 1-18) playing Wavelength selective reflective effect is arrived along sensing single-mode fiber, select each the road optical maser wavelength after reflection all different through fiber grating 9.N, for ease of understanding, we choose the light path that wherein a road is reflected through fiber grating 9.1 and analyze, fiber coupler 2 is arrived after sensing single-mode fiber enters optical fiber splitter 9, three tunnels are divided into by power 1:1:1, wherein a curb single-mode fiber arrives fiber reflection device 5 through optical fiber delay coil, after fiber reflection device 5 reflects, fiber coupler 2 is arrived through optical fiber delay coil 4 along single-mode fiber, three tunnels are divided into by power 1:1:1, wherein 1 tunnel arrives fiber reflection device 3 through single-mode fiber, after fiber reflection device 3 reflects, fiber coupler 2 is back to along single-mode fiber.
Above-mentioned light path 3 and light path 4 produce at fiber coupler 2 interferes, the interference light formed arrives wavelength division multiplexer 10, optical pickup apparatus 11 is arrived along corresponding demodulation wavelength channel 10.1, optical pickup apparatus 11 photoelectricity is enlarged into analog voltage signal, be input in collector and computing machine 12 through cable and carry out A/D conversion, carry out the real-time analysis of signal backstage and process by computing machine.
The monitoring pipeline of light path 1, light path 2 formation interference correspondence forms the way of interfering corresponding monitoring pipeline to be distinguished with light path 3, light path 4 and is phase modulation and demodulation of interferometric, because the modulating frequency of first phase modulator 6, second phase modulator 7 is different, therefore can distinguish.
For the real-time change function of the Calculation of Optical Path interference light intensity of effectively interfering, step is as follows:
If laser incident power is P
0, consider the insertion loss of optical device and the attenuation loss of optical fiber, if total attenuation parameter is a, because optical pickup apparatus 11 filters interference light intensity DC quantity, then the interference light intensity of ac formed is:
P(t)＝aP
0{cos[Δφ(t)+φ
0]-cos(φ
0)}
Wherein, φ
0for the phase bias amount of fiber coupler (2), be that the characteristic of 3*3 coupling mechanism causes, the present embodiment is about 120 °;
The interference of light phase differential that the elasto-optical effect that the disturbance that Δ φ (t) is outer bound pair optical fiber causes causes;
for instantaneous phase rate of change, n is optical fibre refractivity, and l is optical fiber delay coil length, and c is the light velocity; Then the disturbance of outer bound pair optical fiber can cause the superpower real-time change of interference light;
S4, using the data volume of interference of light phase difference φ (t) as disturbance around Real-Time Monitoring pipeline environments, the change according to interference of light phase difference φ (t) is monitored radial pipe network.
Owing to have employed phase modulation and demodulation of interferometric, not only the line areas through first phase modulator 6 and second phase modulator 7 can be separated, and reflection disturbing source feature can be calculated, thus provide strong foundation for the pattern-recognition of signal; In addition due to each wavelength port of the corresponding wavelength division multiplexer 10 of every bar circuit, the acquisition channel of flashlight corresponding collector 12 after 11 optical pickup apparatus amplify of each wavelength port outgoing, therefore all pipeline orders that finally can define monitoring according to acquisition channel numbering.
Below be only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a radial pipe network monitoring system, it is characterized in that, comprise broad band laser light source (1), fiber coupler (2), the first fiber reflection device (3), optical fiber delay coil (4), the second fiber reflection device (5), first phase modulator (6), second phase modulator (7), the first optical fiber splitter (8), the second optical fiber splitter (9), wavelength division multiplexer (10), optical pickup apparatus (11), collector and computing machine (12);
Described second fiber reflection device (5), optical fiber delay coil (4), fiber coupler (2) is linked in sequence successively, described broad band laser light source (1), first fiber reflection device (3), first phase modulator (6), second phase modulator (7), wavelength division multiplexer (10) is all connected with fiber coupler (2), described collector and computing machine (12) are connected with wavelength division multiplexer (10) by optical pickup apparatus (11), described first phase modulator (6), second phase modulator (7) respectively with the first optical fiber splitter (8), second optical fiber splitter (9) is connected,
The distribution terminal of described first optical fiber splitter (8), the second optical fiber splitter (9) connects several fiber gratings respectively.
2. the radial pipe network monitoring system of one according to claim 1, is characterized in that, described broad band laser light source (1) is ASE light source.
3. the radial pipe network monitoring system of one according to claim 1, it is characterized in that, the number of the fiber grating be connected with described first optical fiber splitter (8) is n, and the number of the fiber grating be connected with the second optical fiber splitter (9) is N; Wavelength division multiplexer (10) output terminal quantity is m, then m=max (n, N).
4. the radial pipe network monitoring system of one according to claim 1, is characterized in that, described fiber coupler (2) once draws tapered coupler for 3*3.
5. the radial pipe network monitoring system of one according to claim 1, is characterized in that, described first optical fiber splitter (8), the second optical fiber splitter (9) are PLC type.
6. a radial pipe network monitoring method, is characterized in that, comprise the following steps,
S1, the continuous light in broad band laser light source (1) incides in fiber coupler (2), the K kind light path approach of formation;
S2, each wavelength port of often kind of corresponding wavelength division multiplexer (10) of light path approach, the flashlight that each wavelength port sends is amplified into the acquisition channel of collector through optical pickup apparatus (11), according to all pipeline orders of acquisition channel number definition monitoring;
Producing the light path approach of effectively interfering in S3, K kind light path approach is L kind, to the real-time change function of the light path approach calculating light intensity that L kind is effectively interfered;
The real-time change function of light intensity calculates and specifically comprises the following steps:
If laser incident power is P
0, consider the insertion loss of optical device and the attenuation loss of optical fiber, if total attenuation parameter is a, because optical pickup apparatus (11) filters interference light intensity DC quantity, then interference light intensity of ac P (t) formed is:
P(t)＝aP
0{cos[Δφ(t)+φ
0]-cos(φ
0)}
Wherein, φ
0for the phase bias amount of fiber coupler;
The interference of light phase differential that the elasto-optical effect that the disturbance that Δ φ (t) is outer bound pair optical fiber causes causes;
for instantaneous phase rate of change, n is optical fibre refractivity, and l is optical fiber delay coil length, and c is the light velocity; Then the disturbance of outer bound pair optical fiber can cause the real-time change of interference light intensity;
S4, using the data volume of interference of light phase difference φ (t) as disturbance around Real-Time Monitoring pipeline environments, the change according to interference of light phase difference φ (t) is monitored radial pipe network.
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| CN111829984A (en) * | 2020-07-08 | 2020-10-27 | 哈尔滨工程大学 | Fabry-Perot high humidity sensor and measuring method thereof |
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