CN201780114U - Distributed FBG (fiber bragg grating) sensor network monitoring system capable of switching transmission paths - Google Patents
Distributed FBG (fiber bragg grating) sensor network monitoring system capable of switching transmission paths Download PDFInfo
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- CN201780114U CN201780114U CN2010202134258U CN201020213425U CN201780114U CN 201780114 U CN201780114 U CN 201780114U CN 2010202134258 U CN2010202134258 U CN 2010202134258U CN 201020213425 U CN201020213425 U CN 201020213425U CN 201780114 U CN201780114 U CN 201780114U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 27
- 230000005540 biological transmission Effects 0.000 title claims abstract description 20
- 239000000835 fiber Substances 0.000 title claims description 17
- 230000008878 coupling Effects 0.000 claims description 20
- 238000010168 coupling process Methods 0.000 claims description 20
- 238000005859 coupling reaction Methods 0.000 claims description 20
- 230000007246 mechanism Effects 0.000 claims description 20
- 230000003287 optical effect Effects 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 5
- 239000013307 optical fiber Substances 0.000 abstract description 2
- 230000008054 signal transmission Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 gallium aluminum arsenide compound Chemical class 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920001197 polyacetylene Polymers 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000035899 viability Effects 0.000 description 1
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Abstract
The utility model provides a distributed FBG sensor network monitoring system capable of switching transmission paths, which belongs to an FBG sensor network. The distributed FBG sensor network monitoring system includes an FBG demodulator (1), an optical switch (2), a first coupler (3), a second coupler (5), and a distributed FBG sensor network (4); and the distributed FBG sensor network includes N distributed FBG sensor branches. When partial FBG sensors in the distributed FBG sensor network (4) or a transmission optical fiber has a fault and causes that signals of partial good FBG sensors in the network cannot be demodulated, the optical switch can be switched to change the optical transmission paths and provide a new signal transmission path for the influenced good FBG sensors, the signals of the FBG sensors are completely or partially demodulated again, the fault influence on the whole distributed FBG sensor network is reduced as much as possible, and finally the reliability of the distributed FBG sensor network is improved.
Description
Technical field:
The utility model relates to a kind of FBG sensor network monitoring system, is applied to fields such as intellectual material, aerospace vehicle, physical construction, civil construction.
Background technology:
In the various aerospace flight vehicles, structure will be subjected to the influence of various load and sudden external factor under arms and local damage occur, and the pattern complexity of damage is various, make damage forecast and the difficulty of differentiating strengthen.Optical fiber FBG sensor (Fiber Bragg Grating, FBG) because of have light weight, volume little, corrosion-resistant, be easy to realize distinct advantages such as distributed, in intellectual material, obtained using widely.If the key point in structure is settled the FBG sensor network, and be equipped with appropriate data analysis and recording unit, promptly know the load history of structure member, thereby the actual bearer ability of structure is made assessment more really, to improve the viability of aerospace structure.U.S. Nuo Siluopu-Ge Lumen company is installed in the FBG sensor on the F-18 fighter plane wing cover, and real-time online detects stressed distribution and structural damage on the wing.Boeing adopts the FBG sensor network that its structural health situation is monitored on type aircraft 7E7; Japan's Yokohama long span footpath suspension cable bridge adopts the network that is made of 20 FBG sensors that its state is monitored in real time; Lockheed Corp. adopts the stress of FBG sensor network monitoring X-33 body structure and the variation in temperature field.
During engineering was used, the sensing network of FBG monitoring system connected into distribution formula or quasi-distributed network and embedding or stick in the monitoring of structures usually.The shortcoming of this network topology structure is that all the sensors that is positioned at thereafter all can be affected when damage or fracture take place in the sensor network somewhere, and in case breaks down and be difficult to it is repaired.Along with the continuous expansion that the FBG sensor network system is used, its reliability has become the problem that presses for solution.People generally improve the reliability of its network by the protection that strengthens the FBG sensor at present, and this method can increase the cost of FBG sensor on the one hand, can increase the diameter of FBG sensor on the other hand, and then influence the performance of monitored structure.
The utility model content
The utility model purpose:
Technical problem to be solved in the utility model is the shortcoming that exists at the FBG sensor network monitoring system that proposes in the background technology, has proposed the Distributed FBG sensor network monitoring system of changeable transmission path.
Technical scheme:
The utility model adopts following technical scheme for realizing above-mentioned utility model purpose:
A kind of Distributed FBG sensor network monitoring system of changeable transmission path comprises fiber Bragg grating (FBG) demodulator, photoswitch, first coupling mechanism, second coupling mechanism, Distributed FBG sensor network; Wherein the output terminal of fiber Bragg grating (FBG) demodulator is connected with the input end of photoswitch, the output terminal of photoswitch is connected with the input end of first coupling mechanism, the input end of second coupling mechanism respectively, and the output terminal of the output terminal of first coupling mechanism, second coupling mechanism is connected with the two ends of Distributed FBG sensor network respectively.
Further, the Distributed FBG sensor network comprises the FGB sensor branch road that the N root is parallel in the Distributed FBG sensor network monitoring system of changeable transmission path of the present utility model, wherein every FGB sensor prop up route M FGB sensor and and Transmission Fibers be composed in series, the centre wavelength difference of each sensor wherein, N, M be respectively 〉=2 positive integer.
Further, fiber Bragg grating (FBG) demodulator adopts the Si425 (FBG) demodulator in the Distributed FBG sensor network monitoring system of changeable transmission path of the present utility model.
Beneficial effect:
The utility model is by introducing photoswitch in traditional F BG sensor network monitoring system, when certain the FBG sensor in the FBG sensor network monitoring system or certain section Transmission Fibers is impaired or during fracture, by photoswitch is switched, for affected all or part of intact FBG sensor provides transmission path again, make that intact sensor signal as much as possible obtains demodulation in the network, thereby do not needing to change the reliability that improves whole FBG sensor network under the situation of single FBG sensor reliability.
Description of drawings:
Fig. 1 is a FBG sensor network monitoring system of the present utility model.
Fig. 2 is the Distributed FBG sensor network.
Fig. 3 is a traditional F BG sensor network monitoring system.
Each label title among the figure: 1, fiber Bragg grating (FBG) demodulator, 2, photoswitch, 3, first coupling mechanism, 4, the FBG sensor network, 5, second coupling mechanism, 6,7,8,9, be the FBG sensor, 10, Transmission Fibers.
Specific embodiments:
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
As shown in Figure 1, be FBG sensor network monitoring system of the present utility model, comprise fiber Bragg grating (FBG) demodulator 1, photoswitch 2, first coupling mechanism 3, second coupling mechanism 5, Distributed FBG sensor network 4; Wherein the output terminal of fiber Bragg grating (FBG) demodulator 1 is connected with the input end of photoswitch 2, the output terminal of photoswitch 2 is connected with the input end of first coupling mechanism 3, the input end of second coupling mechanism 5 respectively, and the output terminal of the output terminal of first coupling mechanism 3, second coupling mechanism 5 is connected with the two ends of Distributed FBG sensor network 4 respectively.Components and parts required in the system all can directly be bought, and wherein fiber Bragg grating (FBG) demodulator 1 can adopt the Si425 (FBG) demodulator.
Fig. 2 is the Distributed FBG sensor network.Network among the figure comprises two branch roads, a plurality of FBG sensor series connection that each bar props up the different centre wavelengths of route form, each FBG sensor is positioned over needs the position of monitoring on the measurand, when measured when changing as strain or temperature, the centre wavelength of corresponding FBG sensor changes, by analytic centre's wavelength change amount, can obtain situation of change to be measured, thereby realize real-time, on-line monitoring monitoring target.
Photoswitch is a kind of one or more optional transmit pories that have.Its effect is that the light signal in optical transmission line or the integrated optical circuit is changed or the optical device of logical operation mutually.Photoswitch and light amplification, light signal storage etc. all are the optical devices materials, and photoswitch can be operated in psec (10-12 second).It is based on lithium niobate and gallium aluminum arsenide compound at present, and tread flaking forms from electronics industry.Some new materials are arranged, as liquid crystal, polyacetylene etc. all ratio lithium niobate better optics effectiveness is arranged.
Fig. 3 is a traditional F BG sensor network monitoring system, and when damage or fracture took place in the sensor network somewhere, all the sensors that is positioned at thereafter all can be affected, and in case breaks down and be difficult to it is repaired.And FBG sensor network of the present utility model, when in the FBG sensor network during the equal operate as normal of all the sensors, no matter photoswitch is in any state, and the signal of all the sensors all can obtain demodulation; If certain FBG sensor or certain section Transmission Fibers break down in the network, because the centre wavelength difference of each sensor in the sensor network that the utility model is provided with, so can judge FBG sensor or the Transmission Fibers that breaks down by FBG center sensor wavelength change in the network that collects, after having determined the impaired loci in the network, further judge whether photoswitch is switched, if can make FBG sensor signal more in the network obtain demodulation after switching, then make photoswitch switch to an other end of sensor network, make sensor signal as much as possible obtain gathering, thereby in the Distributed FBG sensor network takes place under the situation of operative sensor cisco unity malfunction, improve monitoring accuracy as far as possible, realize health monitoring structure.
Claims (3)
1. the Distributed FBG sensor network monitoring system of a changeable transmission path is characterized in that: comprise fiber Bragg grating (FBG) demodulator (1), photoswitch (2), first coupling mechanism (3), second coupling mechanism (5), Distributed FBG sensor network (4); Wherein the output terminal of fiber Bragg grating (FBG) demodulator (1) is connected with the input end of photoswitch (2), the output terminal of photoswitch (2) is connected with the input end of first coupling mechanism (3), the input end of second coupling mechanism (5) respectively, and the output terminal of the output terminal of first coupling mechanism (3), second coupling mechanism (5) is connected with the two ends of Distributed FBG sensor network (4) respectively.
2. the Distributed FBG sensor network monitoring system of changeable transmission path according to claim 1, it is characterized in that: described Distributed FBG sensor network (4) comprises the FGB sensor branch road that the N root is parallel, wherein every FGB sensor prop up route M FGB sensor and and Transmission Fibers (10) be composed in series, the centre wavelength difference of each sensor wherein, N, M be respectively 〉=2 positive integer.
3. the Distributed FBG sensor network monitoring system of changeable transmission path according to claim 1 is characterized in that: described fiber Bragg grating (FBG) demodulator (1) employing Si425 (FBG) demodulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202134258U CN201780114U (en) | 2010-06-02 | 2010-06-02 | Distributed FBG (fiber bragg grating) sensor network monitoring system capable of switching transmission paths |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202134258U CN201780114U (en) | 2010-06-02 | 2010-06-02 | Distributed FBG (fiber bragg grating) sensor network monitoring system capable of switching transmission paths |
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| Publication Number | Publication Date |
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| CN201780114U true CN201780114U (en) | 2011-03-30 |
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| CN2010202134258U Expired - Fee Related CN201780114U (en) | 2010-06-02 | 2010-06-02 | Distributed FBG (fiber bragg grating) sensor network monitoring system capable of switching transmission paths |
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2010
- 2010-06-02 CN CN2010202134258U patent/CN201780114U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110330 Termination date: 20130602 |