CN103873140A - Repairing method for optical fiber sensing network based on ring topology structure - Google Patents
Repairing method for optical fiber sensing network based on ring topology structure Download PDFInfo
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- CN103873140A CN103873140A CN201410096718.5A CN201410096718A CN103873140A CN 103873140 A CN103873140 A CN 103873140A CN 201410096718 A CN201410096718 A CN 201410096718A CN 103873140 A CN103873140 A CN 103873140A
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Abstract
The invention discloses a repairing method for an optical fiber sensing network based on a ring topology structure. The method is based on an optical fiber sensing network comprising an fiber bragg grating interrogator and at least two ring subnets, wherein each ring subnetwork comprises a first light path switcher, a second light path switcher and M FBG (fiber bragg grating) sensors; during repairing, the position with the link fault in an optical fiber sensing network is firstly judged; then, an adjacent element linked list for representing the structure of the optical fiber sensing network after the link fault appears is established; then, according to the SPFA (shortest path faster algorithm), the demodulation path of each FBG sensor is obtained; finally, the switching path of the light switcher is calculated; according to the switching path, the corresponding light path in the optical fiber sensing network is switched. According to the repairing method for the optical fiber sensing network based on the ring topology structure, which is disclosed by the invention, an affected FBG sensor with the intact function in the optical fiber sensing network can be demodulated to the largest extent, the optical fiber sensing network can be repaired by self, and the reliability of the whole optical fiber sensing network can be improved.
Description
Technical field
The present invention relates to computer communication field, relate in particular to a kind of restorative procedure of the optical fiber sensing network based on ring topology.
Background technology
The function of, labyrinth as large-scale in aerospace vehicle, bridge tunnel, civil engineering etc. in modern project field and environment for use become more diverse and are complicated.In complicated external environment, the disguise of structure institute damaged is strong, damage, failure mechanism complexity, and type of impairment and degree are difficult to judgement, cause the health monitoring of structure to become particularly complicated the also a large amount of increase of needed number of sensors.FBG transducer has that quality is light, diameter is thin, the transmission of corrosion-resistant, collection signal be sensed as one, be convenient to build the advantages such as distributed sensor, anti-electromagnetic interference capability are strong, in the health monitoring of intellectual material structure, be used widely.If arrange FBG transducer at aerospace vehicle, the isostructural key position of bridge tunnel, just can carry out Real-Time Monitoring to physical quantitys such as the strain of structure, stress, temperature.The U.S. obtains Boeing and on the wing cover of Boeing 787, has arranged hundreds of FBG transducers, and wing fatigue, distribution of force and structural damage are carried out to Real-Time Monitoring; 1999, US Naval Research Laboratory was arranged on 120 fiber-optic grating sensors on a steel structure bridge of No. 10 intercontinental highways of New Mexico Las Cruces, monitors with the health status that realizes stress, temperature and structure to bridge structure; 2000, Canada arranged that on Confederation bridge the vibration under pressure, temperature, traffic loading and the wind action that 740 transducers bear bridge pier column monitors altogether; At home, Wuhan University of Technology arranged 200 fiber-optic grating sensors nearly on the cold lunch box bridge in Guizhou in 2002, the strain in its construction and use procedure, temperature and amount of deflection etc. are monitored.
Along with increasing that FBG transducer is applied in intellectual structure health monitoring system engineering, its network reliability has caused people's extensive concern.Optical fiber sensing network is as the element of intelligent structure health monitoring, and Main Function has been the collection to intelligent structure state parameter, and its functional reliability is most important to whole monitoring system.In the time there is link failure in optical fiber sensing network, system can not accurately gather Monitoring Data, if link failure is not repaired, can produce certain impact to the evaluation result of monitoring structural health conditions, even make monitoring system that the health status of structure is produced wrong report and failed to report.
Due to increasing of FBG number of sensors in optical fiber sensing network on large-scale, labyrinth, add that FBG transducer sticks on the surface of structure more or imbeds in structure, as repaired or change its network, will make a big impact to structure.Therefore improve the reliability of optical fiber sensing network, while making network itself occur link failure, still can normally work, for the useful life that extends intellectual structure health monitoring system, the probability that reduces intellectual structure health monitoring system cost and accident generation is significant.
Summary of the invention
Technical problem to be solved by this invention is the deficiency existing for the optical fiber sensing network reliability of mentioning, and a kind of restorative procedure of the optical fiber sensing network based on ring topology is provided.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A restorative procedure for optical fiber sensing network based on ring topology, described optical fiber sensing network comprises fiber Bragg grating (FBG) demodulator and at least two annular subnets;
Each annular subnet all comprises the first optical path switcher, the second optical path switcher and M FBG transducer, wherein M is more than or equal to 2 integer, after being divided into two groups, M FBG transducer connect, if M is even number, the number of two groups of FBG transducers is M/2, if M is odd number, the number of one group of FBG transducer is (M+1)/2, the number of another group FBG transducer is (M-1)/2, and equal one end of FBG transducer of two groups of series connection is connected with the first optical path switcher, the other end is connected with the second optical path switcher;
The first optical path switcher of each annular subnet is all connected with fiber Bragg grating (FBG) demodulator;
The second optical path switcher series connection of each annular subnet;
The restorative procedure of the described optical fiber sensing network based on ring topology comprises following steps:
Step 1), utilizes fiber Bragg grating (FBG) demodulator to gather the transducing signal of FBG transducer in optical fiber sensing network;
Step 2), according to the performance degradation rule of FBG transducer, failure mechanism and the decay model of damage to transducing signal, the transducing signal gathering in step 1) is adopted to trend curve, clustering method, judge the position that occurs link failure in optical fiber sensing network;
Step 3), sets up and occurs after link failure for representing the adjacent element chained list of optical fiber sensing network structure;
Step 4), according to adjacent element chained list and SPFA algorithm, calculates each FBG transducer to the demodulation paths between fiber Bragg grating (FBG) demodulator;
Step 5), calculates the toggle path of optical path switcher in optical fiber sensing network, and according to toggle path, corresponding optical path switcher in optical fiber sensing network is switched, and makes FBG transducer influenced but that function is intact again obtain demodulation.
As the further prioritization scheme of restorative procedure of a kind of optical fiber sensing network based on ring topology of the present invention, in step 4), calculate each FBG transducer as follows to the concrete steps of the toggle path of optical path switcher in the demodulation paths between fiber Bragg grating (FBG) demodulator and optical fiber sensing network:
Step 4.1), the specific light loss by the light source light power of grating demodulation instrument divided by optical path switcher, draws the maximum optical path switch number that can comprise in demodulation paths;
Step 4.2), by adjacent element chained list and SPFA algorithm, calculate all possible demodulation paths of each FBG transducer;
Step 4.3), screen out the demodulation paths that all optical path switcher numbers are greater than maximum optical path switch number;
Step 4.4), for each FBG transducer, in remaining demodulation paths, select the shortest demodulation paths of length as its demodulation paths.
As the further prioritization scheme of restorative procedure of a kind of optical fiber sensing network based on ring topology of the present invention, in described annular subnet, the quantity of FBG transducer can be identical, also can be different.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
The present invention is directed to the link failure occurring in optical fiber sensing network, foundation occurs after link failure for representing the adjacent element chained list of optical fiber sensing network structure, then obtain the toggle path of each FBG transducer to the demodulation paths between fiber Bragg grating (FBG) demodulator and optical path switcher according to SPFA algorithm, and according to toggle path, corresponding optical path switcher in optical fiber sensing network is switched, make FBG transducer influenced in optical fiber sensing network but that function is intact obtain to greatest extent demodulation, realize the selfreparing of optical fiber sensing network, the final reliability that improves whole optical fiber sensing network.
Accompanying drawing explanation
Fig. 1 is the optical fiber sensing network figure of ring topology;
Fig. 2 is optical fiber sensing network link failure figure;
Fig. 3 is optical fiber sensing network link failure reduced graph;
Fig. 4 is the corresponding adjacent element chained list of link failure;
Fig. 5 is the demodulation paths corresponding to FBG transducer 1,2,3,4,7,13,14,15,16,17,18;
Fig. 6 is the demodulation paths corresponding to FBG transducer 5,6,9,11,12;
Fig. 7 is the demodulation paths corresponding to FBG transducer 10.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
Optical fiber sensing network of the present invention comprises fiber Bragg grating (FBG) demodulator and at least two parallel annular subnets;
Each annular subnet all comprises the first optical path switcher, the second optical path switcher and M FBG transducer, wherein M is more than or equal to 2 integer, after being divided into two groups, M FBG transducer connect, if M is even number, the number of two groups of FBG transducers is M/2, if M is odd number, the number of one group of FBG transducer is (M+1)/2, the number of another group FBG transducer is (M-1)/2, and equal one end of FBG transducer of described two groups of series connection is connected with the first optical path switcher, the other end is connected with the second optical path switcher;
The first optical path switcher of each annular subnet is all connected with fiber Bragg grating (FBG) demodulator;
The second optical path switcher series connection of each annular subnet;
With three parallel annular subnets, M=6 is example, sets up the optical fiber sensing network of ring topology as shown in Figure 1.Wherein
λ ij represent
iin individual annular subnet, start from the left side
jindividual FBG transducer, the FBG transducer number consecutively that sensor number starts from first annular subnet left side.
The restorative procedure of the optical fiber sensing network based on ring topology comprises following steps:
Step 1), utilizes fiber Bragg grating (FBG) demodulator to gather the transducing signal of FBG transducer in optical fiber sensing network.
Step 2), according to the performance degradation rule of FBG transducer, failure mechanism and the decay model of damage to transducing signal, the transducing signal gathering in step 1) is adopted to trend curve, clustering method, judge the position that occurs link failure in optical fiber sensing network.
Suppose that the optical fiber sensing network of judging ring topology produces link failure as shown in Figure 2.Optical path switcher initial condition
k 1=
k 3=
k 5=
k 7=
k 9=
k 11=1, on fiber Bragg grating (FBG) demodulator, can only obtain the transducing signal of FBG transducer (1,2,3,4,7,13,14,15,16,17,18), other FBG transducers (5,6,8,9,10,11,12) signal can not demodulation.。
The optical fiber sensing network link failure reduced graph of accompanying drawing 3 respective figure 2.In figure
k i (
i=1 ~ 12) represent the state of corresponding optical path switcher,
k i =1 represents respective optical path connection,
k i =0 represents that respective optical path disconnects.
k 1~
k 8,
k 11,
k 12the switching state of corresponding five 1 × 2 optical path switchers,
k 9,
k 10the switching state of corresponding 2 × 2 optical path switchers.According to the characteristic of optical path switcher, when
k 1=1 o'clock
k 2=0,
k 1=0 o'clock
k 2=1.
k 3,
k 4,
k 5,
k 6,
k 7,
k 8,
k 9,
k 10,
k 11,
k 12in like manner.
Step 3), sets up and occurs after link failure for representing the adjacent element chained list of optical fiber sensing network structure.
The 3 adjacent element chained lists of setting up as shown in Figure 4 with reference to the accompanying drawings.
The concrete steps of setting up adjacent element chained list are as follows:
Step 3.1), set up one for storing the gauge outfit element array of gauge outfit element information;
Step 3.2), set up the adjacent element node chained list of each gauge outfit element, wherein each element node has three territories: the sequence number of summit domain representation element; Chain territory is in order to point to the next element adjacent with gauge outfit element; Switch the switching state of optical path switcher between domain representation gauge outfit element and adjacent element.If the not element adjacent with gauge outfit element, pointer is empty, represents with " ∧ ";
Step 3.3), the adjacent element node chained list of each gauge outfit element and this element in gauge outfit element array is coupled together, obtain the adjacent element chained list of whole topological structure.
Step 4), according to adjacent element chained list and SPFA algorithm, calculates each FBG transducer to the demodulation paths between fiber Bragg grating (FBG) demodulator.
SPFA algorithm idea is to safeguard with a queue.When initial, gauge outfit element is added to queue, from queue, take out an element at every turn, and all elements adjacent with it are relaxed.If certain adjacent element relaxes successfully, joined the team.Repeat such process until queue is sky.
Calculate each FBG transducer as follows to the concrete steps of the toggle path of optical path switcher in the demodulation paths between fiber Bragg grating (FBG) demodulator and optical fiber sensing network:
Step 4.1), the specific light loss by the light source light power of grating demodulation instrument divided by optical path switcher, draws the maximum optical path switch number that can comprise in demodulation paths;
Step 4.2), by adjacent element chained list and SPFA algorithm, calculate all possible demodulation paths of each FBG transducer;
Step 4.3), screen out the demodulation paths that all optical path switcher numbers are greater than maximum optical path switch number;
Step 4.4), for each FBG transducer, in remaining demodulation paths, select the shortest demodulation paths of length as its demodulation paths.
Step 5), calculates the toggle path of optical path switcher in optical fiber sensing network, and according to toggle path, corresponding optical path switcher in optical fiber sensing network is switched, and makes FBG transducer influenced but that function is intact again obtain demodulation.
The restoration information obtaining according to step 4), switches corresponding optical path switcher in optical fiber sensing network, can regain FBG5, FBG6, FBG9
-the transducing signal of FBG12, but the transducing signal of FBG8 cannot obtain demodulation by any path, and concrete repair path is as shown in accompanying drawing 5,6,7.By the restorative procedure of the optical fiber sensing network based on ring topology, make FBG transducer influenced in optical fiber sensing network but that function is intact obtain to greatest extent demodulation, thereby reduce as far as possible the impact of link failure on whole optical fiber sensing network, realize the selfreparing of optical fiber sensing network ring topology, finally improve the reliability of whole optical fiber sensing network.
The above; it is only the implementation example of the inventive method; not the present invention is imposed any restrictions, everyly according to technical solution of the present invention, the variation of any simple modification made for any of the above embodiments, structure is replaced and all still being belonged in the protection range of the technology of the present invention system.
Claims (3)
1. a restorative procedure for the optical fiber sensing network based on ring topology, is characterized in that, described optical fiber sensing network comprises fiber Bragg grating (FBG) demodulator and at least two annular subnets;
Each annular subnet all comprises the first optical path switcher, the second optical path switcher and M FBG transducer, wherein M is more than or equal to 2 integer, after being divided into two groups, M FBG transducer connect, if M is even number, the number of two groups of FBG transducers is M/2, if M is odd number, the number of one group of FBG transducer is (M+1)/2, the number of another group FBG transducer is (M-1)/2, and equal one end of FBG transducer of two groups of series connection is connected with the first optical path switcher, the other end is connected with the second optical path switcher;
The first optical path switcher of each annular subnet is all connected with fiber Bragg grating (FBG) demodulator;
The second optical path switcher series connection of each annular subnet;
The restorative procedure of the described optical fiber sensing network based on ring topology comprises following steps:
Step 1), utilizes fiber Bragg grating (FBG) demodulator to gather the transducing signal of FBG transducer in optical fiber sensing network;
Step 2), according to the performance degradation rule of FBG transducer, failure mechanism and the decay model of damage to transducing signal, the transducing signal gathering in step 1) is adopted to trend curve, clustering method, judge the position that occurs link failure in optical fiber sensing network;
Step 3), sets up and occurs after link failure for representing the adjacent element chained list of optical fiber sensing network structure;
Step 4), according to adjacent element chained list and SPFA algorithm, calculates each FBG transducer to the demodulation paths between fiber Bragg grating (FBG) demodulator;
Step 5), calculates the toggle path of optical path switcher in optical fiber sensing network, and according to toggle path, corresponding optical path switcher in optical fiber sensing network is switched, and makes FBG transducer influenced but that function is intact again obtain demodulation.
2. according to the restorative procedure of the optical fiber sensing network based on ring topology described in right 1, it is characterized in that, in step 4), calculate each FBG transducer as follows to the concrete steps of the toggle path of optical path switcher in the demodulation paths between fiber Bragg grating (FBG) demodulator and optical fiber sensing network:
Step 4.1), the specific light loss by the light source light power of grating demodulation instrument divided by optical path switcher, draws the maximum optical path switch number that can comprise in demodulation paths;
Step 4.2), by adjacent element chained list and SPFA algorithm, calculate all possible demodulation paths of each FBG transducer;
Step 4.3), screen out the demodulation paths that all optical path switcher numbers are greater than maximum optical path switch number;
Step 4.4), for each FBG transducer, in remaining demodulation paths, select the shortest demodulation paths of length as its demodulation paths.
3. according to the restorative procedure of the optical fiber sensing network based on ring topology described in right 1, it is characterized in that, in described annular subnet, the quantity of FBG transducer can be identical, also can be different.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109115263A (en) * | 2018-05-28 | 2019-01-01 | 蓝箭航天技术有限公司 | Space launch vehicle measuring system |
| CN109743103A (en) * | 2019-02-01 | 2019-05-10 | 福州大学 | FBG sensing network node fault repairing method based on ELM |
| CN113447061A (en) * | 2021-06-26 | 2021-09-28 | 山东航天电子技术研究所 | Micro sensing implantation type monitoring system and method for spacecraft composite material |
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| CN112286087A (en) * | 2018-05-28 | 2021-01-29 | 蓝箭航天技术有限公司 | Carrier rocket measurement system |
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