CN204555926U - A kind of distributive fiber optic strain measuring system based on the long adjustable F-P white light interference demodulating equipment in chamber - Google Patents
A kind of distributive fiber optic strain measuring system based on the long adjustable F-P white light interference demodulating equipment in chamber Download PDFInfo
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- CN204555926U CN204555926U CN201420795996.5U CN201420795996U CN204555926U CN 204555926 U CN204555926 U CN 204555926U CN 201420795996 U CN201420795996 U CN 201420795996U CN 204555926 U CN204555926 U CN 204555926U
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Abstract
The utility model belongs to technical field of optical fiber sensing, is specifically related to a kind ofly can be used for the Real-Time Monitoring of the distribution strain of multiple spot standard or the physical quantitys such as accurate Temperature Distribution and the distributive fiber optic strain measuring system growing adjustable F-P white light interference demodulating equipment based on chamber of measurement.The utility model is by wide spectrum light source, four fiber port circulators, the fiber coupler that dual-port connects, the long adjustable F-P white light interference demodulating equipment in chamber, three fiber port circulators, first Transmission Fibers and the second Transmission Fibers, first fibre optic sensor arra and the second fibre optic sensor arra, first photodetection signal amplifier and the second photodetection signal amplifier and the first signal processing unit and secondary signal processing unit composition, due to the use of optical fiber circulator, eliminate the signal of feedback into light source, improve the stability of light source, enhance the utilization factor of light source power, further increase the multiplexing capacity of sensor-based system.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, and what be specifically related to is a kind ofly can be used for the Real-Time Monitoring of the distribution strain of multiple spot standard or the physical quantitys such as accurate Temperature Distribution and the distributive fiber optic strain measuring system growing adjustable F-P white light interference demodulating equipment based on chamber of measurement.
Background technology
One of advantage of Fiber White-light Interferometer can realize multiplexed exactly easily.In respective coherent length, only there is single optical interference signals in multiple sensor, does not thus need more complicated time or channeling technology to process signal.In recent years, white light interference sensing technology obtains vigorous growth, and one of them focus is exactly developed the multiple Fibre Optical Sensor based on multiplexing technique and test macro, for straining, the measurement of the physical quantity such as temperature, pressure.Its development of multiplexing technique is mainly due in actual measurement and Test Application, the sensing of single physical amount and single location point, far can not meet the requirement of people's or system state perception overall to things, this often needs to carry out online or real-time measurement to distribution that is multiple or multiple spot physical quantity.Such as to the Non-Destructive Testing of large scale structure (power station, dam, bridge etc.) with monitoring to determine in the process of its safety, Fibre Optical Sensor is needed to implant key position, and be built into monitoring network, the stress of its inside, the information such as strain and temperature are extracted.Therefore, number of sensors is generally tens or up to a hundred, if test macro only connects with one point sensing device, its test cost will improve greatly undoubtedly, reduce system reliability simultaneously.Adopt multiplexing technique, utilize same demodulating system to carry out inquiry to the metrical information of multiple sensor, this not only greatly simplify system complexity, and makes measuring accuracy and reliability have also been obtained guarantee.Meanwhile, due to multiplexing technique, reduce the cost of one point sensing device, thus testing expense is greatly reduced, improve cost performance, make Fibre Optical Sensor have more advantage compared with traditional sensors.
The restriction that white light interference optical fiber sensing device can avoid the very long signal of coherent length in laser of narrowband light source situation to run into effectively and problem.A major advantage of space division multiplexing white light interference optical fiber sensing device to measure absolute growth and time delay.In addition, because the coherent length of transducing signal is short, the time exsiccation can eliminating system parasitic light is disturbed.Another advantage of space division multiplexing white light interference technique does not need the time division multiplex of relative complex or frequency multiplexing technique just can by multiple sensor coherent multiplexing in a signal.Space division multiplexing technology is that the light path by using scanning interferometer (as Michelson interferometer) to realize flashlight and reference light matches and realizes.If the light path of two paths of signals light matches, white-light fringe can be observed in the output signal of interferometer.Can realize high-precision absolute measurement, the parameter that can measure comprises position, displacement, strain and temperature etc.
In actual applications, especially in the monitoring of building structure, usually need quasi-distributed measurement building structure being grown to distance, multiple spot.But for traditional Fiber White-light Interferometer structure, the length of sensor fibre is subject to the restriction of the range of adjustment of variable sweep arm.In addition, even if can obtain the range of adjustment of long distance, the loss that light signal transmits in the space optical path of long distance also can be very large.
For solving the problem, nineteen ninety-five U.S. H-P company Wayne V.Sorin and Douglas M.Baney discloses a kind of multiplexing method (United States Patent (USP): the patent No. 5557400) of the white light interference sensor based on light path autocorrelator, based on Michelson interferometer structure, mating between the optical path difference utilizing light signal to be formed between Michelson interferometer fixed arm and variable sweep arm and former and later two end face reflection light signal optical path differences of Fibre Optical Sensor, realizes light path auto-correlation, obtain the white light interference signal of this sensor, recycling changes scan arm and mates one by one with each sensor in multiple end to end serial fibre optic sensor arra with the path difference of light between fixed arm, complete the multiplexed of Fibre Optical Sensor.
In addition, applicant in Low coherence strand disclosed in 2007 and 2008 turn round formula class Sagnac optical-fiber deformation sensor (Chinese patent: 200710072350.9) and space division multiplexing Mach-Zehnder cascade type optical fiber interferometer and measuring method (China Patent No.: ZL 200810136824.6) be mainly used to the problem of anti-breaking-up in solution Fibre Optical Sensor multiplexed arrays the procedures of establishment; Composite instrument (Chinese patent: ZL 200810136819.5) and the twin array Michelson optical fiber white light interference strain gage (China Patent No.: ZL200810136820.8) of applicant optical fiber Mach-Zehnder and Michelson interferometer array disclosed in 2008 are mainly used in solving the multiplexed middle temperature of white light fibre optic interferometer to measurements interference, and temperature and strain measure problem simultaneously; Applicant a kind of simplifying type multiplexing white light interference optical fiber sensing demodulating equipment (Chinese patent: ZL 200810136826.5) and the distributed optical fiber white light interference sensor array (Chinese patent: ZL 200810136833.5) based on adjustable Fabry-Perot resonant cavity disclosed in 2008, introducing ring cavity, F-P cavity light path autocorrelator are mainly used in the topological structure simplifying multiplexed interferometer, structure is light path form altogether, improves temperature stability; Applicant disclosed in 2008 a kind of double-datum length low coherent optical fiber ring network apparatus for sensing demodulating (Chinese Patent Application No.: the 200810136821.2) introducing of 4 × 4 fiber coupler light path autocorrelators, object measures problem while of solving many reference sensors.
But above-mentioned based in the interferometer structure of space division multiplexing, light source power decay is large, light source utilization rate is low, and the light sent by light source, only has a less part to reach sensor array, is detected device and receives formation interference signal.With light channel structure disclosed in W.V.Sorin, when the light signal of sensor array reflection is by fiber coupler 1, only have the light of half to enter Michelson autocorrelator, and second half light fall along the optical path loss be connected with light source.In addition, enter the light of Michelson autocorrelator, when overcoupling device 2, only have again half light to enter photodetector after being reflected by catoptron, second half light feeds back in coupling mechanism 1.Therefore, this structure only has at most the light source power of 1/4 to have contribution to sensing process.In addition, light through coupling mechanism 1 feedback directly can enter light source, although the light source type used is wide spectrum optical, compared with LASER Light Source, very inresponsive to feedback, but excessive signal power feedback, particularly for the light source that the spontaneous radiation gains such as SLD and ASE are larger, feedback light can cause the larger noise of light source.
Utility model content
The purpose of this utility model is to provide a kind of simple and compact for structure, easy distributive fiber optic strain measuring system based on the long adjustable F-P white light interference demodulating equipment in chamber of operation adjustment.
The purpose of this utility model is achieved in that
Based on the distributive fiber optic strain measuring system of the long adjustable F-P white light interference demodulating equipment in chamber, by wide spectrum light source 1, four fiber port circulators 2, the fiber coupler 3 that dual-port connects, the long adjustable F-P white light interference demodulating equipment 4 in chamber, three fiber port circulators 5, first Transmission Fibers 6 and the second Transmission Fibers 7, first fibre optic sensor arra 8 and the second fibre optic sensor arra 9, first photodetection signal amplifier 10 and the second photodetection signal amplifier 11 and the first signal processing unit 12 and secondary signal processing unit 13 form, the light that spectrum light source 1 sends is injected into the long adjustable F-P white light interference demodulating equipment 4 in chamber via warp after four fiber port circulators 2 by fiber coupler 3, two bundles that the long adjustable F-P white light interference demodulating equipment in chamber produces optical path difference adjustable inquire light signal, the first fibre optic sensor arra 8 and the second fibre optic sensor arra 9 is admitted to by the first Transmission Fibers 6 and the second Transmission Fibers 7 respectively through after three fiber port circulators and four fiber port circulators, the interference signal light reflected by the first fibre optic sensor arra 8 is again by the first Transmission Fibers 6, received via three fiber port circulators 5 by the first photodetection signal amplifier 10 and be exaggerated, signal provides measurement result after being processed by the first signal processing unit 12, the interference signal light reflected by the second fibre optic sensor arra 9 is again by the second Transmission Fibers 7, received via four fiber port circulators 2 by the second photodetection signal amplifier 11 and be exaggerated, after processing finally by secondary signal processing unit 13, providing measurement result.
The long adjustable F-P white light interference demodulating equipment in chamber a Sagnac ring light line structure and a long adjustable F-P fibre optic interferometer in chamber is of coupled connections respectively by two dual-port 2 × 2 fiber couplers, F-P fibre optic interferometer is wherein coated with the optical fiber of completely reflecting mirror 42 by one end, the other end is connected with an optical fiber GRIN Lens collimating apparatus 43 composition, optical fiber GRIN Lens collimating apparatus is fixed on the pedestal of an accurate slippage platform, planar wave catoptron 44 is fixed on can on the platform of slippage, face optical fiber GRIN Lens collimating apparatus, constitute the F-P interferometer that a light path is adjustable.
Fibre optic sensor arra is made up of basic fibre optic sensor arra, the Fibre Optical Sensor that fibre optic sensor arra is then connected in series successively by several head and the tail forms, each Fibre Optical Sensor is then made up of the arbitrary single-mode fiber of a segment length, fibre optic sensor arra is that the gating single-mode fiber section that a series of length does not wait being formed end to end serial array or increase by 1 × M multi-channel optical fibre switch connects M linear optical fiber sensor array M Optical Fiber Sensing Array being configured to a circling measurment or by 1 × N, N=2, 3, 4 ... Optical Fiber Star Couplers forms bus type optical fiber sensing network topological structure, star fiber optic sensor network topology structure and composite star-shaped optical fiber sensing network topological structure.
The beneficial effects of the utility model are:
The utility model discloses a kind of multiplexed distributive fiber optic strain measuring system of Low coherence based on the long adjustable F-P white light interference demodulating equipment in chamber.Can be used for Real-Time Monitoring and the measurement of the physical quantitys such as the distribution strain of multiple spot standard or accurate Temperature Distribution, the fields such as large-sized intelligent structure health monitoring can be widely used in.It adopts Sagnac optical fiber structure to be connected in the light path of system as demodulated interferential instrument by long for a chamber adjustable F-P interferometer.By adopting two fiber optical circulators, fibre optic sensor arra and photodetector are coupled together, the signal that Fibre Optical Sensor is reflected all is coupled in photodetector, with compared with first technology, due to the use of optical fiber circulator, eliminate the signal of feedback into light source, improve the stability of light source, enhance the utilization factor of light source power simultaneously, the light that light source can be made to send all is utilized, and also further increases the multiplexing capacity of sensor-based system.
Accompanying drawing explanation
Fig. 1 is the structural representation of the multiplexed accurate profile fiber strain measurement system of Low coherence based on the long adjustable F-P white light interference demodulating equipment in chamber.
Fig. 2 is the structural representation of the long adjustable F-P white light interference demodulating equipment in chamber.
Fig. 3 a is linear array optical fiber sensing network topological structure schematic diagram.
Fig. 3 b is switching regulator array of parallel linear optical fiber sensing network topological structure schematic diagram.
Fig. 4 a is the bus type optical fiber sensing network topological structure schematic diagram based on linear array.
Fig. 4 b is the star fiber optic sensor network topology structural representation based on linear array.
Fig. 4 c is the composite star-shaped optical fiber sensing network topological structure schematic diagram based on linear array.
Fig. 5 is that in the multiplexed accurate profile fiber strain measurement system of Low coherence based on the long adjustable F-P white light interference demodulating equipment in chamber, two fibre optic sensor arras all adopt the schematic diagram of the system embodiment of simple linear array.
Embodiment
The utility model is set forth further below in conjunction with specific embodiment.
The utility model provides a kind of distributive fiber optic strain measuring system based on the long adjustable F-P white light interference demodulating equipment in chamber.It is characterized in that: the fiber coupler 3 that it is connected by wide spectrum light source 1, four fiber port circulator 2, dual-port, chamber long adjustable F-P white light interference demodulating equipment 4, three fiber port circulator 5, Transmission Fibers 6 and 7, fibre optic sensor arra 8 and 9, photodetection signal amplifier 10 and 11 and signal processing unit 12 and 13 form.The utility model can be used for Real-Time Monitoring and the measurement of the physical quantitys such as the distribution strain of multiple spot standard or accurate Temperature Distribution, can be widely used in the fields such as large-sized intelligent structure health monitoring.
Fig. 1 is the structural representation of the multiplexed accurate profile fiber strain measurement system of Low coherence based on the long adjustable F-P white light interference demodulating equipment in chamber.The fiber coupler 3 connected by wide spectrum light source 1, four fiber port circulator 2, dual-port, chamber long adjustable F-P white light interference demodulating equipment 4, three fiber port circulator 5, Transmission Fibers 6 and 7, fibre optic sensor arra 8 and 9, photodetection signal amplifier 10 and 11 and signal processing unit 12 and 13 form.
Fig. 2 is the structural representation of the long adjustable F-P white light interference demodulating equipment in chamber.This white light interference demodulating equipment a Sagnac ring light line structure and a long adjustable F-P fibre optic interferometer in chamber is of coupled connections respectively by two dual-port 2 × 2 fiber couplers 3 and 41, F-P fibre optic interferometer is wherein coated with the optical fiber of completely reflecting mirror 42 by one end, the other end is connected with an optical fiber GRIN Lens collimating apparatus 43 composition, this optical fiber collimator 43 is fixed on the pedestal of an accurate slippage platform, planar wave catoptron 44 is fixed on can on the platform of slippage, face optical fiber collimator 43, constitute the F-P interferometer that a light path is adjustable.
Fig. 3 a is linear array optical fiber sensing network topological structure schematic diagram, and Fig. 3 b is switching regulator array of parallel linear optical fiber sensing network topological structure schematic diagram.
Fig. 4 a and Fig. 4 b is the topological structure schematic diagram of fibre optic strain sensor array network.The optical fiber sensing network adopted in system is all made up of basic fibre optic sensor arra, the Fibre Optical Sensor that fibre optic sensor arra is then connected in series successively by several head and the tail forms, and each Fibre Optical Sensor then, two ends any by a segment length forms with the single-mode fiber of fiber stub.The single-mode fiber section that a series of length does not wait is formed end to end serial array, and by 1 × N (N=2,3,4 ...) Optical Fiber Star Couplers formation linear array formula optical fiber sensing network topological structure, bus type optical fiber sensing network topological structure, star fiber optic sensor network topology structure and composite star-shaped optical fiber sensing network topological structure as shown in the figure.
Fig. 5 is in the multiplexed accurate profile fiber strain measurement system of Low coherence based on the long adjustable F-P white light interference demodulating equipment in chamber, two fibre optic sensor arras all adopt the schematic diagram of the system embodiment of simple linear array, and in figure, 8,9 is linear optical fiber sensor array.
The fiber coupler 3 that this accurate profile fiber strain measurement system is connected by wide spectrum light source 1, four fiber port circulator 2, dual-port, chamber long adjustable F-P white light interference demodulating equipment 4, three fiber port circulator 5, Transmission Fibers 6 and 7, fibre optic sensor arra 8 and 9, photodetection signal amplifier 10 and 11 and signal processing unit 12 and 13 form.The light that in described system, wide spectrum light source 1 sends is injected into the long adjustable F-P white light interference demodulating equipment 4 in chamber via warp after four fiber port circulators 2 by dual-port fiber coupler 3, two bundles that this interferometric demodulation device produces optical path difference adjustable inquire light signal, fibre optic sensor arra 8 and 9 is admitted to by Transmission Fibers 6 and 7 respectively through after three fiber port circulators 5 and four fiber port circulators 2, the interference signal light reflected by sensor array 8 is again by Transmission Fibers 6, via three fiber port circulators 5 receive by photodetector 10 and be exaggerated, this signal provides measurement result after being processed by signal processing unit 12, meanwhile, the interference signal light reflected by sensor array 9 again by Transmission Fibers 7, via four fiber port circulators 2 receive by photodetector 11 and be exaggerated, this signal provides measurement result after being processed by signal processing unit 13.
Because this fibre optic sensor arra is formed by N section optical fiber head and the tail serial connection, just constitute the sensor array be made up of N number of Fibre Optical Sensor.The length of every section of sensor fibre is respectively l
1, l
2..., l
n, with the two optical path difference L produced in the long adjustable F-P white light interference demodulating equipment in chamber
0length close, the length of every section of optical fiber is all different, and meets following relation
nL
0+X
j＝nl
j,j＝1,2...N (1)
In formula, n is the refractive index of fiber cores, and has l
i≠ l
j, thus have X
i≠ X
j, that is each sensor corresponds to separately independently locus, and when applying a distributed stress on sensor fibre, the length of each sensor is respectively from l
1become l
1+ Δ l
1, l
2become l
2+ Δ l
2..., l
nbecome l
n+ Δ l
n, so can obtain this distributed strain is
By the scanning repeatedly to change in optical path length, during for any i-th sensor, sensor length l can be obtained by measuring
ivariable quantity
divided by known length amount l
irecord the mean strain on each section of optical fiber.
In order to realize adjustment and the scan matching of optical path difference, the utility model constructs the long adjustable F-P white light interference demodulating equipment in chamber, as shown in Figure 2.This white light interference demodulating equipment a Sagnac ring light line structure and a long adjustable F-P fibre optic interferometer in chamber is of coupled connections respectively by two dual-port 2 × 2 fiber couplers 3 and 41, F-P fibre optic interferometer is wherein coated with the optical fiber of completely reflecting mirror 42 by one end, the other end is connected with an optical fiber GRIN Lens collimating apparatus 43 composition, this optical fiber collimator 43 is fixed on the pedestal of an accurate slippage platform, planar wave catoptron 44 is fixed on can on the platform of slippage, face optical fiber collimator 43, constitute the F-P interferometer that a light path is adjustable.The effect of this white light interference demodulating equipment has two, one is incident beam is divided into the two-way with certain optical path difference, two is that to adjust the chamber of F-P interferometer by mobile optical catoptron long, thus change the optical path difference of this two-beam signal, realize the Matched measurement to each Fibre Optical Sensor change in optical path length in fibre optic sensor arra.
In order to further expand the quantity of Fibre Optical Sensor, the number of Optical Fiber Sensing Array also can be increased to M array by the utility model in the system shown in figure 1, like this, optical fiber sensing system connects by the gating increasing by 1 × M multi-channel optical fibre switch, M the Optical Fiber Sensing Array that often row contain N number of Fibre Optical Sensor is configured to a N × M Fibre Optical Sensor matrix, as shown in Figure 3 a and Figure 3 b shows.
In order to meet the demand of various sensing measurement, the demodulating system that the utility model adopts can adapt to various optical fiber sensing network structure.We know, optical fiber sensing network is made up of basic fibre optic sensor arra, the Fibre Optical Sensor that fibre optic sensor arra is then connected in series successively by several head and the tail forms, and each Fibre Optical Sensor then, two ends any by a segment length forms with the single-mode fiber of fiber stub.The single-mode fiber section that a series of length does not wait is formed end to end serial array, and by 1 × N (N=2,3,4 ...) Optical Fiber Star Couplers can form bus type optical fiber sensing network topological structure, star fiber optic sensor network topology structure and composite star-shaped optical fiber sensing network topological structure as shown in Fig. 4 a and Fig. 4 b.
Fig. 5 gives the embodiment of the multiplexed accurate profile fiber strain measurement system of Low coherence based on the long adjustable F-P white light interference demodulating equipment in chamber.The fiber coupler 3 that system is connected by wide spectrum light source 1, four fiber port circulator 2, dual-port, chamber long adjustable F-P white light interference demodulating equipment 4, three fiber port circulator 5, Transmission Fibers 6 and 7, fibre optic sensor arra 8 and 9, photodetection signal amplifier 10 and 11 and signal processing unit 12 and 13 form.The light that in described system, wide spectrum light source 1 sends is injected into the long adjustable F-P white light interference demodulating equipment 4 in chamber via warp after four fiber port circulators 2 by dual-port fiber coupler 3, two bundles that this interferometric demodulation device produces optical path difference adjustable inquire light signal, fibre optic sensor arra 8 and 9 is admitted to by Transmission Fibers 6 and 7 respectively through after three fiber port circulators 5 and four fiber port circulators 2, the interference signal light reflected by sensor array 8 is again by Transmission Fibers 6, via three fiber port circulators 5 receive by photodetector 10 and be exaggerated, this signal provides measurement result after being processed by signal processing unit 12, meanwhile, the interference signal light reflected by sensor array 9 again by Transmission Fibers 7, via four fiber port circulators 2 receive by photodetector 11 and be exaggerated, this signal provides measurement result after being processed by signal processing unit 13.
During system works, the long adjustable F-P white light interference demodulating equipment in chamber will pass through the adjustment of optical path difference and the mode of scan matching, carries out scan matching to the Fibre Optical Sensor of each different length.The effect of this white light interference demodulating equipment has two, one is incident beam is divided into the two-way with certain optical path difference, two is that to adjust the chamber of F-P interferometer by mobile optical catoptron long, thus change the optical path difference of this two-beam signal, realize the Matched measurement to each Fibre Optical Sensor change in optical path length in fibre optic sensor arra.
In system, 8,9 is two simple linear optical fiber sensor arraies, and each fibre optic sensor arra is cut into by series of standards single-mode fiber and forms after the roughly equal fiber segment of length carries out cascade, the wherein length of each section of optical fiber all Different L
i≠ L
ji, j=1,2 ..., N, at this moment each section of optical fiber all can regard an independently length miniature deformation measuring instrument as, which forms quasi-distributed optical fiber measuring system, as shown in Figure 5.Namely this system can be used for the measurement of quasi-distributed strain, also can be used for realizing quasi-distributed temperature survey.Can be widely used in the intelligent structure health monitoring field of civil engineering work.
Claims (3)
1. the distributive fiber optic strain measuring system based on the long adjustable F-P white light interference demodulating equipment in chamber, by wide spectrum light source (1), four fiber port circulators (2), the fiber coupler (3) that dual-port connects, the long adjustable F-P white light interference demodulating equipment (4) in chamber, three fiber port circulators (5), first Transmission Fibers (6) and the second Transmission Fibers (7), first fibre optic sensor arra (8) and the second fibre optic sensor arra (9), first photodetection signal amplifier (10) and the second photodetection signal amplifier (11) and the first signal processing unit (12) and secondary signal processing unit (13) composition, it is characterized in that: the light that wide spectrum light source (1) sends grows adjustable F-P white light interference demodulating equipment (4) via four fiber port circulators (2) by being injected into chamber by fiber coupler (3), two bundles that the long adjustable F-P white light interference demodulating equipment in chamber produces optical path difference adjustable inquire light signal, the first fibre optic sensor arra (8) and the second fibre optic sensor arra (9) is admitted to by the first Transmission Fibers (6) and the second Transmission Fibers (7) respectively through after three fiber port circulators and four fiber port circulators, the interference signal light reflected by the first fibre optic sensor arra (8) is again by the first Transmission Fibers (6), received via three fiber port circulators (5) by the first photodetection signal amplifier (10) and be exaggerated, signal provides measurement result after being processed by the first signal processing unit (12), the interference signal light reflected by the second fibre optic sensor arra (9) is again by the second Transmission Fibers (7), received via four fiber port circulators (2) by the second photodetection signal amplifier (11) and be exaggerated, providing measurement result finally by after secondary signal processing unit (13) process.
2. a kind of distributive fiber optic strain measuring system based on the long adjustable F-P white light interference demodulating equipment in chamber according to claim 1, it is characterized in that: the long adjustable F-P white light interference demodulating equipment in described chamber a Sagnac ring light line structure and a long adjustable F-P fibre optic interferometer in chamber is of coupled connections respectively by two dual-port 2 × 2 fiber couplers, F-P fibre optic interferometer is wherein coated with the optical fiber of completely reflecting mirror (42) by one end, the other end of optical fiber is connected with an optical fiber GRIN Lens collimating apparatus (43) composition; Optical fiber GRIN Lens collimating apparatus is fixed on the pedestal of an accurate slippage platform, planar wave catoptron (44) is fixed on can on the platform of slippage, face optical fiber GRIN Lens collimating apparatus, constitute the F-P interferometer that a light path is adjustable.
3. a kind of distributive fiber optic strain measuring system based on the long adjustable F-P white light interference demodulating equipment in chamber according to claim 1, it is characterized in that: described fibre optic sensor arra is made up of basic fibre optic sensor arra, the Fibre Optical Sensor that fibre optic sensor arra is then connected in series successively by several head and the tail forms, each Fibre Optical Sensor is then made up of the arbitrary single-mode fiber of a segment length, fibre optic sensor arra is that the gating single-mode fiber section that a series of length does not wait being formed end to end serial array or increase by 1 × M multi-channel optical fibre switch connects M linear optical fiber sensor array M Optical Fiber Sensing Array being configured to a circling measurment or by 1 × N, N=2, 3, 4 ... Optical Fiber Star Couplers forms bus type optical fiber sensing network topological structure, star fiber optic sensor network topology structure and composite star-shaped optical fiber sensing network topological structure.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535007A (en) * | 2014-12-15 | 2015-04-22 | 哈尔滨工程大学 | Distributed type optical fiber strain measurement system based on cavity-length-adjustable F-P white light interference demodulating device |
| CN105606138A (en) * | 2016-03-10 | 2016-05-25 | 哈尔滨工程大学 | Cavity-length adjustable F-P type multi-scale quasi-distributed white light interferometry sensing system |
| CN111750795A (en) * | 2020-06-18 | 2020-10-09 | 哈尔滨工程大学 | Distributed creep measurement system and measurement method |
| CN112098310A (en) * | 2020-09-07 | 2020-12-18 | 深圳大学 | Corrosion monitoring sensing element, interference sensor and method |
-
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535007A (en) * | 2014-12-15 | 2015-04-22 | 哈尔滨工程大学 | Distributed type optical fiber strain measurement system based on cavity-length-adjustable F-P white light interference demodulating device |
| CN105606138A (en) * | 2016-03-10 | 2016-05-25 | 哈尔滨工程大学 | Cavity-length adjustable F-P type multi-scale quasi-distributed white light interferometry sensing system |
| CN105606138B (en) * | 2016-03-10 | 2019-05-17 | 哈尔滨工程大学 | A kind of long adjustable multiple dimensioned quasi-distributed white light interference sensor-based system of F-P type of chamber |
| CN111750795A (en) * | 2020-06-18 | 2020-10-09 | 哈尔滨工程大学 | Distributed creep measurement system and measurement method |
| CN112098310A (en) * | 2020-09-07 | 2020-12-18 | 深圳大学 | Corrosion monitoring sensing element, interference sensor and method |
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