CN102589590A - Method and system for constructing frequency domain reflecting fiber grating sensing network of bus topological structure - Google Patents
Method and system for constructing frequency domain reflecting fiber grating sensing network of bus topological structure Download PDFInfo
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Abstract
The invention relates to a method and a system for constructing a frequency domain reflecting fiber grating sensing network of a bus topological structure. The frequency domain reflecting fiber grating sensing network of the bus topological structure is formed by connecting fiber grating distributed sensing network branches and a network main line both based on the frequency domain reflecting technology by using a three-terminal optical fiber circulator, a four-terminal optical fiber circulator and a network node upper and lower carrier wave division multiplexer consisting of two chirped fiber gratings with complementary reflecting spectra. The network has high capacity and high spatial resolution and increases the measuring distance by dozens of times. The network does not adopts an optical fiber divider, so the insertion loss is low; a signal transmission main line can adopt an armored optical cable and sensing measurement branches can be connected through a flexible optical fiber or an optical cable, so assembling flexibility and convenience of a fiber grating sensor are guaranteed; and damage to the branched fiber grating sensor does not influence normal signal transmission of other branched fiber grating sensors, so the survival rate of the network sensor and the operating reliability of the network are high.
Description
Technical field
The present invention relates to optical fiber grating sensing network, particularly relate to the construction method and the system of the optical fiber grating sensing network of a kind of high capacity, high flexibility ratio, remote intensive measurement, belong to the fiber grating sensing technology field.
Technical background
One of technical advantage of optical fiber grating sensing is exactly to adopt wavelength-division multiplex (United States Patent (USP) 4806012), time division multiplex (United States Patent (USP) 4996419; 6212306B1; 6571027B2) with frequency domain reflection (United States Patent (USP) 5798521; 6566648B1) technology is connected in series the composition optical fiber grating sensing network with a plurality of fiber gratings, in the safety monitoring system of heavy construction and great equipment, is with a wide range of applications.In the optical fiber grating sensing network system of wavelength-division multiplex; Wavelength-encoding is adopted in the location of fiber-optic grating sensor; And the measuring amount of fiber-optic grating sensor also is to use wavelength signals; The measurement range of sensor takies certain wavelength bandwidth, and under the situation of light source total bandwidth resource-constrained, network capacity is very limited.In adopting time-multiplexed optical fiber grating sensing network system, though network capacity be greatly improved,, the spatial resolution of sensing measurement limited (referring to document [1]).Adopt the optical fiber grating sensing network of frequency domain reflection technology can solve network capacity and spatial resolution problem (referring to document [2] and document [3]); But; Because the frequency domain reflection technology is a kind of coherent detection technology; Owing to receive light source coherence's restriction, so the measuring distance of network is very limited.
In these employings " wavelength-division multiplex ", " time division multiplex ", " frequency domain reflection " optical fiber grating sensing network system; Not only there are such or such shortcoming and defect such as network capacity is limited, spatial resolution is low, measuring distance is near; And because the structure of these sensing networks all is the direct series system that adopts fiber-optic grating sensor; When one of them fiber-optic grating sensor breaks down or damages; All signals of the fiber-optic grating sensor of back all can interrupt, so there is severe integrity problem in sensing network.The optical fiber grating sensing network system that " the frequency domain reflection " that Chinese patent 201010250519.7 provides mixes with " wavelength-division multiplex "; The measuring distance of the optical fiber grating sensing network of frequency domain reflection is improved tens of times; But the serial connection mode is still adopted in network struction, and the network reliability problem does not solve.Document [4] and document [5] have provided a kind of bus topolopy of fiber grating wavelength-division multiplex sensing network.In the optical fiber grating sensing network of this topological structure; No longer directly be connected in series between the fiber-optic grating sensor; And be to use " optical fiber splitter " that fiber-optic grating sensor is separated from signal transmission bus; The reliability of network has obtained large increase, still, and the still the same restriction that receives the light source bandwidth of its network capacity with the wavelength-division multiplex sensing network.Simultaneously, this network uses optical fiber splitter as light-splitting device, and its beam split function is that light intensity loss with branch road is a cost, has influenced the multiplexing quantity and the measuring distance of network greatly.In order to remedy the loss of signal energy, document [4] and document [5] have all used Raman Fiber Amplifier, and this has increased network cost undoubtedly.The patent No. is the network struction mode that 200810157486.4 Chinese patent and document [6] have provided a kind of star structure; This is a kind of internetwork connection mode of parallel connection; It all strengthens aspect reliability and maintainability to some extent; But this network struction mode is to be cost with the scale that increases network backbone Transmission Fibers or optical cable and signal receiving and processing equipment, simultaneously; Use a large amount of optical fiber splitters as light-splitting device in the link of star network, had identical capacity and the cost problem of sensing network that provides with document [4] and document [5].
Document:
[1]Yunmiao?Wang，Jianmin?Gong，Dorothy?Y.Wang，A?Quasi-Distributed?Sensing?Network?With?Time-Division-Multiplexed?Fiber?Bragg?Gratings，IEEE?Photonics?Technology?Letters，2011，23(2)：70～72。
[2]Brooks?A.Childers，Mark?E.Froggatt，Sidney?G.Allison，et.al.，Use?of?3000?Bragg?grating?strain?sensors?distributed?on?four?eight-meter?optical?fibers?during?static?load?tests?of?a?composite?structure，Proc.SPIE-Int.Soc.Opt.Eng.，Newport?Beach，CA，2001，4332，133-142。.
[3]H.Murayama，K.Ohara，N.Kanata，et.al.，Strain?Monotoring?and?Defect?Detection?in?Welded?Joints?by?Using?Fiber-Optic?Distributed?Sensors?with?High?Spatial?Resolution，E-Journal?of?Advanced?Maintenance，2010/2011，2，191-199。
[4]S.Diaz，G.Lasheras?and?M.Lopez-Amo，WDM?bi-directional?transmission?over?35km?amplified?fiber-optic?bus?network?using?Raman?amplification?for?optical?sensors，Optics?Express，2005，13(24)：9666～9671。
[5]S.Diaz，B.Cerrolaza，G.Lasheras，et.al.，Double?Raman?Amplified?Bus?Networks?for?Wavelength-Division?Multiplexing?of?Fiber-Optic?Sensors，J.of?Lightwave?Technology，2007，25(3)：733～739。
[6]Shu-Tsung?Kuo，Peng-Chun?Peng，Jen-Wei?Sun，et.al.，A?Delta-Star-Based?Multipoint?Fiber?Bragg?Grating?Sensor?Network，IEEE?SENSORS?JOURNAL，2011，11(4)：875～881。
Summary of the invention
The objective of the invention is to propose a kind of frequency domain reflection fiber grating sensing network construction method and system of bus topolopy to the actual needs in the optical fiber grating sensing practical applications and the deficiency of prior art.The network establishing method and the principle that adopt frequency domain reflection and wavelength-division multiplex technique to combine improve sensing network capacity, spatial resolution and measuring distance, strengthen the survival rate and the reliability of network.
The objective of the invention is to reach through following measure:
The frequency domain reflection fiber grating sensing network construction method of a kind of bus topolopy of the present invention; The network establishing method that adopts frequency domain reflection and wavelength-division multiplex technique to combine; Each branch road fiber grating is connected on network backbone optical fiber or the optical cable through carriers division multiplex function element about each node in the sensing network, forms the frequency domain reflection fiber grating sensing network of bus topolopy; The function element of carriers division multiplex up and down of each node is made up of one three terminal optical fiber circulator, four terminal optical fiber circulators and two complementary chirped fiber gratings of reflectance spectrum.
The frequency domain reflection fiber grating sensing network system of bus topolopy of the present invention; It comprises: tunable narrow-linewidth laser light source, optical fiber circulator, node up and down carriers division multiplex function element N-1, N-2 ... N-n; Signal transmission fiber or optical cable; The weak reflection fiber grating sensor array FBG1 that wavelength is identical, FBG2 ... FBGn, optical signal acquisition device, computing machine and tunable narrow-linewidth laser controller; Described node up and down carriers division multiplex function element N-1, N-2 ... N-n has three ports, is respectively port I, port II and port III; Described tunable narrow-linewidth laser light source is connected with the 1st terminal of described optical fiber circulator; The 2nd terminal of optical fiber circulator is connected with described signal transmission fiber or optical cable; Node up and down carriers division multiplex function element N-1, N-2 ... The port I of N-n is connected with described signal transmission fiber or optical cable respectively with port II, the weak reflection fiber grating sensor array FBG1 that wavelength is identical, FBG2 ... FBGn respectively with node corresponding up and down carriers division multiplex function element N-1, N-2 ... The port III of N-n links to each other; The 3rd terminal of described optical fiber circulator is connected with described optical signal acquisition device; Its optical signal acquisition device is connected with described computing machine through FPDP, and this computing machine is controlled described tunable narrow-linewidth laser light source through described tunable narrow-linewidth laser controller simultaneously.
In the frequency domain reflection fiber grating sensing network system of bus topolopy of the present invention, described node up and down carriers division multiplex function element N-1, N-2 ... Each of N-n is made up of one three terminal optical fiber circulator, four terminal optical fiber circulators, two complementary the 1st chirped fiber grating and the 2nd chirped fiber gratings of reflectance spectrum; Its connected mode is: the 1st terminal of three terminal optical fiber circulators is connected with the 4th terminal of four terminal optical fiber circulators; The terminal of three terminal optical fiber circulators is connected with the 1st terminal of four terminal optical fiber circulators; The 2nd terminal of three terminal optical fiber circulators is as the port I of carriers division multiplex function element about the node; The 2nd terminal of four terminal optical fiber circulators is connected with an end of the 1st chirped fiber grating, and the other end of the 1st chirped fiber grating is as the port II of carriers division multiplex function element about the node; The 3rd terminal of four terminal optical fiber circulators is connected with an end of the 2nd chirped fiber grating, and the other end of the 2nd chirped fiber grating is as the port III of carriers division multiplex function element about the node.
In the frequency domain reflection fiber grating sensing network system of bus topolopy of the present invention, the weak reflection fiber grating sensor array FBG1 that described wavelength is identical, FBG2 ... FBGn is a branch road; From node up and down inner the 1st chirped fiber grating of carriers division multiplex function element to the distance of first fiber grating of being connected of carriers division multiplex function element port III should be greater than the length of this branch road reflection fiber grating sensor array a little less than all up and down with this node.
The application characteristic of the frequency domain reflection fiber grating sensing network system of bus topolopy of the present invention is: laser that described tunable narrow-linewidth laser light source sends is through the network node that is made up of complementary the 1st chirped fiber grating of three terminal optical fiber circulators, four terminal optical fiber circulators, two reflectance spectrums and the 2nd chirped fiber grating carriers division multiplex function element up and down; The light of a certain wave band is downloaded to corresponding optical fiber grating sensing network branches, and remaining light wave continues to next node transmission; Turn back to transmitting terminal through carriers division multiplex function element about the node along original optical path again after the weak reflection fiber grating sensor array reflection of the light signal of download through each branch road serial connection; Pass to described optical signal acquisition device through optical fiber circulator, its optical signal acquisition device carry out opto-electronic conversion become digital signal after the input computing machine carry out digital information processing; Simultaneously, computing machine carries out length scanning control through tunable narrow-linewidth laser controller to tunable narrow-linewidth laser light source.
The frequency domain reflection fiber grating sensing network system of bus topolopy of the present invention mainly is made up of tunable narrow-linewidth laser light source, three terminals and four terminal optical fiber circulators, chirped fiber grating, Transmission Fibers or optical cable, weak reflection fiber grating sensor array, optical signal acquisition device, computing machine and tunable narrow-linewidth laser light source controller; The laser that tunable narrow-linewidth laser light source sends is through carriers division multiplex function element about the network node that is made up of three terminals, four terminal optical fiber circulators and chirped fiber grating; The light of a certain wave band is downloaded to corresponding optical fiber grating sensing network branches, and remaining light wave continues to next node transmission; Turn back to transmitting terminal through carriers division multiplex function element about the node along original optical path again after the weak reflection fiber grating sensor array reflection of the light signal of download through each branch road serial connection; Pass to optical signal acquisition device through optical fiber circulator, optical signal acquisition device carry out opto-electronic conversion become digital signal after the input computing machine carry out digital information processing; Simultaneously, computing machine carries out length scanning control through tunable narrow-linewidth laser controller to tunable laser source.
The optical fiber grating sensing network that the present invention makes up does not use the optical fibre light splitting device of the sort of high energy loss of optical fiber splitter; And be to use low-loss three terminals, four terminal optical fiber circulators and chirped fiber grating to realize the network node function of carriers division multiplex up and down; Both reach the bidirectional reversible transfer function of desired narrow-band filtering download of optical fiber grating sensing network and link, reduced the loss of signal again.The frequency domain reflection fiber grating sensing network of this bus topolopy can oil pipeline large-scale at those, that measure dot number is intensive, remote monitoring and power transmission lines safety, tunnel and tank fire are reported to the police and monitoring systems such as border foreign body intrusion warning in be used widely.
The present invention compared with prior art has following outstanding advantage:
The frequency domain reflection fiber grating sensing network of the bus topolopy that 1, the present invention relates to combines bus type topological structure and frequency domain reflection sensing technology; The advantage that capacity is big, spatial resolution is high that has not only kept the frequency domain reflection; And, also can the measuring distance of sensing network be improved tens of times;
The backbone of the frequency domain reflection fiber grating sensing network of the bus topolopy that 2, the present invention relates to can use the armouring optical cable to carry out special protection; The branch road of sensing measurement can use flexible optical fibre or optical cable to connect; Fiber-optic grating sensor installation flexibility and convenience had both been guaranteed; Owing to the damage of branch optical fiber grating sensor, can not influence the normal transmission of other branch's sensor signal, simultaneously so the survival rate of network sensor improves greatly;
The backbone of the frequency domain reflection fiber grating sensing network of the bus topolopy that 3, the present invention relates to and each bar branch road be the network node formed through three terminal optical fiber circulators, four terminal optical fiber circulators and two complementary chirped fiber gratings of reflectance spectrums up and down the carriers division multiplex function element be connected; Except the insertion loss of a little; The light energy losses that does not almost have other, whole sensing network reliability of operation is enhanced.
Description of drawings
Fig. 1 is a chirped fiber grating CFBG1 reflectance spectrum
Fig. 2 is a chirped fiber grating CFBG1 transmitted spectrum
Fig. 3 is the reflectance spectrum of chirped fiber grating CFBG2
Fig. 4 is the transmitted spectrum of chirped fiber grating
Fig. 5 is a broadband spectral
Fig. 6 is the frequency domain reflection fiber grating sensing network system of bus topolopy of the present invention
Among Fig. 6,1-is tunable narrow-linewidth laser light source, 2-optical fiber circulator; 3-signal transmission fiber or optical cable, the weak reflection fiber grating sensor array that the 4-wavelength is identical (wherein FBG1, FBG2 ... The sequence number of FBG n is represented the weak reflection fiber grating of different wave length), the 5-optical signal acquisition device; The 6-computing machine, 7-is tunable narrow-linewidth laser controller, 8-three terminal optical fiber circulators; 9-four terminal optical fiber circulators; 10-the 1st chirped fiber grating (CFBG1), 11-the 2nd chirped fiber grating CFBG2, N-1, N-2 ..., N-n-node carriers division multiplex function element (among the figure in the frame of broken lines) up and down.
Annotate: because N-2 among Fig. 6 ..., N-n (frame of broken lines) the inner structure of inner structure and N-1 identical, so N-2 ..., N-n inner structure details do not draw, only represent with rectangle.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention and realization principle are further described.
The structure of the frequency domain reflection fiber grating sensing network of bus topolopy of the present invention is as shown in Figure 6, and it comprises: tunable narrow-linewidth laser light source 1, optical fiber circulator 2; Node up and down carriers division multiplex function element N-1, N-2 ... N-n; Signal transmission fiber or optical cable 3, the weak reflection fiber grating sensor array that wavelength is identical (FBG1, FBG2 ... FBGn) 4, optical signal acquisition device 5; Computing machine 6, tunable narrow-linewidth laser controller 7.
Node up and down carriers division multiplex function element N-1, N-2 ... N-n has three ports, is respectively port I, port II and port III.Node up and down carriers division multiplex function element N-1, N-2 ... N-n is made up of three terminal optical fiber circulators 8, four terminal optical fiber circulators the 9, the 1st chirped fiber grating (CFBG1) 10 and the 2nd chirped fiber grating (CFBG2) 11.Concrete connected mode is: the 1st terminal 8-1 of three terminal optical fiber circulators 8 is connected with the 4th terminal 9-4 of four terminal optical fiber circulators 9, and the 3rd terminal 8-3 of three terminal optical fiber circulators 8 is connected with the 1st terminal 9-1 of four terminal optical fiber circulators 9.The 2nd terminal 8-2 of three terminal optical fiber circulators 8 is as the port I of carriers division multiplex function element about the node; The 2nd terminal 9-2 of four terminal optical fiber circulators 9 is connected with an end of the 1st chirped fiber grating (CFBG1) 10, and the other end of the 1st chirped fiber grating (CFBG1) 10 is as the port II of carriers division multiplex function element about the node.The 3rd a terminal 9-3 of four terminal optical fiber circulators 9 and an end of chirped fiber grating (CFBG2) 11 are connected, and the other end of the 2nd chirped fiber grating (CFBG2) 11 is as the port III of carriers division multiplex function element about the node.
Tunable wave length pulsed laser light source 1 is connected with the 1st port 2-1 of optical fiber circulator 2; The 2nd port 2-2 of optical fiber circulator 2 is connected with signal transmission fiber or optical cable 3; Node up and down carriers division multiplex function element N-1, N-2 ... The port I of N-n is connected with signal transmission fiber or optical cable 3 respectively with port II, the weak reflection fiber grating sensor array FBG1 that wavelength is identical, FBG2 ... FBGn respectively with node corresponding up and down carriers division multiplex function element N-1, N-2 ... The port III of N-n links to each other.The 3rd port 2-3 of optical fiber circulator 2 is connected with optical signal acquisition device 5, and optical signal acquisition device 5 is connected with computing machine 6 through FPDP.Simultaneous computer 6 is through the tunable narrow-linewidth laser light source of tunable narrow-linewidth laser controller 7 controls.
The node up and down inner light transmission path of carriers division multiplex function element N-1 is: the broadband light of spectrum such as Fig. 5 incides the 2nd terminal 9-2-→ the 1st chirped fiber grating CFBG1 of the 1st terminal 9-1-→ four terminal circulators 9 of the 3rd terminal 8-3-→ four terminal circulators 9 of the 2nd terminal 8-2-→ three terminal optical fiber circulators 8 of-→ three terminal optical fiber circulators 8; The 1st chirped fiber grating CFBG1 is with narrow band light (spectrum such as Fig. 1) reflection of a certain wavelength bandwidth, and the light that is not reflected (spectrum such as Fig. 2) is from node carriers division multiplex function element N-1 output port II output up and down; By the narrow band light (spectrum such as Fig. 1) of the 1st chirped fiber grating CFBG1 reflection; Get into the 2nd terminal 9-2 of four terminal circulators 9 once more; The 3rd terminal 9-3 outgoing from four terminal circulators 9; This band of light just in time can be passed through the 2nd chirped fiber grating CFBG2, is node carriers division multiplex function element N-1 output port III output up and down from the other end of the 2nd chirped fiber grating CFBG2, output spectrum (like Fig. 4).Because optical fiber circulator except that a little inserts loss, does not have other intensity losses basically, so light is very little through the loss of carriers division multiplex function element N-1 about the node.
Each node up and down carriers division multiplex function element N-2 ..., the N-n interior lights transmission path identical with N-1, just from N-1, N-2 ... The wavelength coverage of N-n port II, III output has nothing in common with each other.
The principle of work of the frequency domain reflection fiber grating sensing network system of bus topolopy is: tunable narrow-linewidth laser light source 1 sends laser through optical fiber circulator 2 entering signal Transmission Fibers or optical cable 3; Transmission Fibers or optical cable 3 are downloaded a part of narrow band light identical with FBG1 centre wavelength through the port III of carriers division multiplex function element N-1 about the node; Another part light is from the node port II output of carriers division multiplex function element N-1 up and down; And continue along optical fiber or optical cable 3 transmission; There is the centre wavelength narrow band light identical to download again through carriers division multiplex function element N-2 about the node from port III with FBG2; Remainder light continues again along optical fiber or optical cable 4 transmission ...After the laser that the reflection fiber grating sensor array lists a little less than inciding reflects through optical fiber optical grating array; Again from node up and down carriers division multiplex function element N-1, N-2 ... The port III of N-n uploads; And export from port I; Turn back on the 2nd port 2-2 of optical fiber circulator 2 along former road, carry out opto-electronic conversion through inciding low light level signal picker 5 after optical fiber circulator 2 the 3rd port 2-3 output.
The fiber grating of a certain branch road is the weak reflection fiber grating of identical wavelength; The frequency domain principle of reflection is adopted with the wavelength recognition methods in its location: weak reflection fiber grating array that each branch road wavelength is identical and node corresponding the 1st inner chirped fiber grating CFBG1 of carriers division multiplex function element are up and down formed a series of " Fabry-Perot " reflective filter; The frequency spectrum of these wave filters is stacks of the sine or the cosine function of a series of different frequencies; The cycle of these sines or cosine function is relevant with the spacing between the fiber grating of forming these " Fabry-Perot " wave filters, carries out a series of signal processing such as Fourier transform and inverse Fourier transform through the frequency spectrum function that these are superimposed and just can realize that optical fiber grating sensing is measured and the location.
Claims (5)
1. the frequency domain reflection fiber grating sensing network construction method of bus topolopy; It is characterized in that: the network establishing method that adopts frequency domain reflection and wavelength-division multiplex technique to combine; Each branch road fiber grating is connected on network backbone optical fiber or the optical cable through carriers division multiplex function element about each node in the sensing network, forms the frequency domain reflection fiber grating sensing network of bus topolopy; The function element of carriers division multiplex up and down of described each node is made up of one three terminal optical fiber circulator, four terminal optical fiber circulators and two complementary chirped fiber gratings of reflectance spectrum.
2. the frequency domain reflection fiber grating sensing network system of bus topolopy; It is characterized in that it comprises: tunable narrow-linewidth laser light source (1), optical fiber circulator (2), node up and down carriers division multiplex function element N-1, N-2 ... N-n; Signal transmission fiber or optical cable (3); The weak reflection fiber grating sensor array FBG1 that wavelength is identical, FBG2 ... FBGn (4), optical signal acquisition device (5), computing machine (6) and tunable narrow-linewidth laser controller (7); Described node up and down carriers division multiplex function element N-1, N-2 ... N-n has three ports, is respectively port I, port II and port III; Tunable narrow-linewidth laser light source (1) is connected with the 1st terminal (2-1) of optical fiber circulator (2); The 2nd terminal (2-2) of optical fiber circulator (2) is connected with signal transmission fiber or optical cable (3); Node up and down carriers division multiplex function element N-1, N-2 ... The port I of N-n is connected with signal transmission fiber or optical cable (3) respectively with port II, the weak reflection fiber grating sensor array FBG1 that wavelength is identical, FBG2 ... FBGn (4) respectively with node corresponding up and down carriers division multiplex function element N-1, N-2 ... The port III of N-n links to each other; The 3rd terminal (2-3) of optical fiber circulator (2) is connected with optical signal acquisition device (5); Optical signal acquisition device (5) is connected with computing machine (6) through FPDP, and simultaneous computer (6) is through tunable narrow-linewidth laser controller (7) control tunable narrow-linewidth laser light source (1).
3. the frequency domain reflection fiber grating sensing network system of bus topolopy according to claim 2 is characterized in that: described node up and down carriers division multiplex function element N-1, N-2 ... Each of N-n is made up of one three terminal optical fiber circulator (8), four terminal optical fiber circulators (9), two complementary the 1st chirped fiber grating and the 2nd chirped fiber gratings of reflectance spectrum; Its connected mode is: the 1st terminal (8-1) of three terminal optical fiber circulators (8) is connected with the 4th terminal (9-4) of four terminal optical fiber circulators (9); The terminal (8-3) of three terminal optical fiber circulators (8) is connected with the 1st terminal (9-1) of four terminal optical fiber circulators (9); The 2nd terminal (8-2) of three terminal optical fiber circulators (8) is as the port I of carriers division multiplex function element about the node; The 2nd terminal (9-2) of four terminal optical fiber circulators (9) is connected with an end of the 1st chirped fiber grating (10), and the other end of the 1st chirped fiber grating (10) is as the port II of carriers division multiplex function element about the node; The 3rd terminal (9-3) of four terminal optical fiber circulators (9) is connected with an end of the 2nd chirped fiber grating (11), and the other end of the 2nd chirped fiber grating (11) is as the port III of carriers division multiplex function element about the node.
4. the frequency domain reflection fiber grating sensing network system of bus topolopy according to claim 2 is characterized in that: the weak reflection fiber grating sensor array FBG1 that described wavelength is identical, FBG2 ... FBGn (4) is a branch road; From node up and down inner the 1st chirped fiber grating (10) of carriers division multiplex function element to this node about the distance of first fiber grating of being connected of carriers division multiplex function element port III should be greater than the length of this branch road reflection fiber grating sensor array a little less than all.
5. the application of the frequency domain reflection fiber grating sensing network system of bus topolopy according to claim 2; It is characterized in that: the laser that tunable narrow-linewidth laser light source (1) sends passes through by carriers division multiplex function element about the network node of the 1st chirped fiber grating (10) of three terminal optical fiber circulators (8), four terminal optical fiber circulators (9), two reflectance spectrum complementations and the 2nd chirped fiber grating (11) formation; The light of a certain wave band is downloaded to corresponding optical fiber grating sensing network branches, and remaining light wave continues to next node transmission; Turn back to transmitting terminal through carriers division multiplex function element about the node along original optical path again after weak reflection fiber grating sensor array (4) reflection of the light signal of download through each branch road serial connection; Pass to optical signal acquisition device (5) through optical fiber circulator, optical signal acquisition device (5) carries out opto-electronic conversion and becomes and import computing machine (6) after the digital signal and carry out digital information processing; Simultaneously, computing machine (6) carries out length scanning control through tunable narrow-linewidth laser controller (7) to tunable narrow-linewidth laser light source (1).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103631063A (en) * | 2013-03-08 | 2014-03-12 | 北方工业大学 | High-precision ultrashort light pulse sampler based on time walk technology |
| CN103631063B (en) * | 2013-03-08 | 2016-04-13 | 北方工业大学 | Based on the high precision ultrashort light pulse sampler of time-scale extension technology |
| CN112953626A (en) * | 2021-03-03 | 2021-06-11 | 金陵科技学院 | High-reliability fiber grating network model based on optical switch |
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