CN102102998A - Distributed sensing system based on weak Bragg reflection structure - Google Patents
Distributed sensing system based on weak Bragg reflection structure Download PDFInfo
- Publication number
- CN102102998A CN102102998A CN2010105903567A CN201010590356A CN102102998A CN 102102998 A CN102102998 A CN 102102998A CN 2010105903567 A CN2010105903567 A CN 2010105903567A CN 201010590356 A CN201010590356 A CN 201010590356A CN 102102998 A CN102102998 A CN 102102998A
- Authority
- CN
- China
- Prior art keywords
- bragg reflection
- optical fiber
- wavelength
- weak
- distributed sensing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a distributed sensing system based on a weak Bragg reflection structure. The distributed sensing system comprises a SG-DBR (Screen Grid-Distributed Bragg Reflector) tunable laser (1), an electrooptic modulator (4), an opto-isolator (5), an optical circulator (6), and weak Bragg reflection cycle structural optical fibers (7), which are connected in turn; wherein the SG-DBR tunable laser (1) is controlled by a wavelength tuning control circuit (2), the electrooptic modulator (4) is controlled by an impulse function generator (3), a photo-detector (8) is connected with the optical circulator (6), control signals outputted by the wavelength tuning control circuit (2) and the electrooptic modulator (4) and electric signals outputted by the photo-detector (8) enter a data acquisition card (9) jointly, and are processed and then transmitted to a data processing device (10). The distributed sensing system realizes the long-distance distributed sensing alarm for parameters such as temperature, stress and vibration, and has the characteristics of higher detection sensitivity and positioning precision, easiness for realization, lower cost and reliability for operation.
Description
Technical field
The present invention relates to field of sensing technologies, particularly at the application of weak Bragg reflection periodic structure optical fiber in distributed sensing.It is based on the continuous back scattering effect and the wavelength-modulated sensing characteristics of distribution type fiber-optic, carry out parameter detection and location in conjunction with " optical wavelength Time Domain Reflectometry (OWTDR) " innovative technology, acquisition distributes along the spatial field of optical fiber parameter to be measured along the line, constitutes the distributed sensing warning system based on weak Bragg reflection structured optical fiber.
Background technology
The intellectuality of material and structure is a challenging problem of 21 century.Utilize intelligence structure to analyze the monitoring works structural damage, assess high-risk equipment work situation, have crucial meaning for the burst of the incidents that is against any misfortune, the safety of protection people's lives and properties.Thereby optical fiber sensing technology has obtained developing rapidly in recent years, also is subjected to people and more and more pays close attention to.Wherein, distributing optical fiber sensing (DOFS) becomes at present the focus of research in the world especially.The distributing optical fiber sensing technology of having reported at present mainly contains three classes: 1. based on the backward scattered optical time domain reflection of optical fiber (OTDR) technology; 2. long apart from interference technique (Interferometer); 3. based on multiplexing accurate distributed sensor technology of Fiber Bragg Grating FBG (FBG) etc.
Distributed sensing based on light back scattering technology utilizes the optical time domain reflection Detection Techniques to realize: the characteristic (light intensity, polarization state, frequency etc.) according to rear orientation light changes definite parameter size to be measured, determine the position according to the echo time, obtain the space distribution of parameter to be measured thus, spatial resolution is determined by pulse width.These class sensor light sending and receiving are at the same end of optical fiber, single light source work, system is simple, but rear orientation light very a little less than, the single detection sensitivity is lower, multiple averaging measures that then real-time is relatively poor, ability of data processing requires very high.Simultaneously, the light intensity sensing shows as the variation of output signal luminous power, is subjected to all multifactor influences in long range sensing easily, and measurement accuracy and reliability are difficult to guarantee; The polarization state sensing requires to adopt polarization maintaining optical fibre, the cost height, and it is higher to extract polarization state evolution-information difficulty on technology realizes.
Interferometers such as long-range Mach-Ze De, Sagnac and Michelson are mixed use, can carry out distributed measurement time dependent disturbance.For example, Sagnac/Mach-Ze De, Sagnac/Michelson-, Sagnac/Sagnac, Mach-Ze De/Mach-Ze De and difference ring/dual interferometer structures such as ring are comprising types such as single light source simple detector and single light source double detectors.This class sensor relies on the light signal of forward transmitted to interfere sensing and ad hoc structure location, has advantages such as highly sensitive, that Dynamic Signal detects, distance sensing is long, real-time is good.But interfere the variation that shows as the output signal luminous power, be subjected to all multifactor influences easily in long range sensing, measurement accuracy and reliability are difficult to guarantee; Be difficult to solve as the polarization decay phenomenon in the communications optical cable of sensor fibre; The principle of interference of phase modulation-type causes being difficult to realize that multiple spot detects simultaneously; Complex structure.Therefore, interference technique is difficult to practicability in long-distance distributed sensing.
The FBG sensing shows as centre wavelength modulation (or Wavelength-encoding), can measure the variation of extraneous parameter by the monitoring that the FBG reflection wavelength is moved, detectivity is not subjected to the influence of factors such as light source power fluctuation, bending loss of optical fiber, detector wear out, and is fit to the long-term safety monitoring.But based on a great problem that the distributed sensing of FBG faces is the restriction that the system multiplexing capacity is subjected to light source and filter bandwidht, and array generally can only multiplexing about 15 grating, and this is far from being enough for the highdensity Distributed Detection of long distance.Therefore the optical fiber optical grating multiplexing Study on Technology is subjected to extensive concern, this method has solved the problem that multiplexing number in the wavelength-division multiplex technique is subjected to light source and wavelengt demodulator bandwidth constraints, but still need demodulation reflected light wavelength could determine the temperature maximal value, and maximum shortcoming is to differentiate the particular location that overtemperature takes place.
Summary of the invention
Technical matters to be solved by this invention is: at the problem of existing distributed optical fiber sensing technology existence, a kind of distributed sensing system based on weak Bragg reflection structured optical fiber is provided, make it in long-distance sensing warning of parameters such as temperature, stress and vibration, obtain widespread use, the present invention has very high detection sensitivity and vibration bearing accuracy, this system realizes easily, cost is lower, and reliable.
The present invention solves its technical matters and adopts following technical scheme:
Based on the distributed sensing system of weak Bragg reflection structured optical fiber, comprise SG-DBR tunable laser, electrooptic modulator, optoisolator, optical circulator, weak Bragg reflection periodic structure optical fiber, they link to each other successively; The SG-DBR tunable laser is controlled by the wavelength tuning control circuit, electrooptic modulator is controlled by impulse function generator, also be connected to photo-detector on the optical circulator, the electric signal of the control signal of wavelength tuning control circuit and electrooptic modulator output and photo-detector output enters data collecting card jointly, sends into data analysis facilities after the processing.
Described weak Bragg reflection periodic structure optical fiber comprises the continuous successively reference grating that is added with protective device and entirely with weak Bragg reflection periodic structure, optical circulator is connected to the reference grating that is added with protective device.
Described weak Bragg reflection structured optical fiber comprises the fiber core of outer field UV transparent coat and internal layer, Bragg reflection structure a little less than sequence distributes on the fiber core.
The present invention compared with prior art mainly has the following advantages:
One, the present invention adopts weak Bragg reflection structure (WBRS) as sensing unit, and luminance factor back scattering technology will exceed several orders of magnitude, surveys more easy and measuring accuracy is higher, and reflectivity can be according to the application requirements flexible design.
Its two, what the present invention surveyed is wavelength variations, rather than Strength Changes, is not subjected to the light source power influence of fluctuations, more reliable on the performance.
Its three, the present invention adopts entirely with weak Bragg reflection structure (WBRS), the retroreflectance of each position is extremely low, can satisfy long distance detecting and can not omit the metrical information of any position.Therefore, distance sensing and detection closeness will get a qualitative improvement.
Its four, the present invention adopts optical wavelength Time Domain Reflectometry (OWTDR) technology, realize to survey simultaneously and the location, need not Wavelength demodulation, the real-time height, cost is low.
The present invention can break through the predicament of existing optical fiber sensing technology, increase substantially sensor-based system capacity and distance sensing, can be widely used in monitoring fields such as bridge security control, power transmission and transformation line monitoring, regional circumference Security alert, nuclear plant safety monitoring and seabed supervision.
Description of drawings
Fig. 1 is the distributed sensing warning system principle schematic based on weak Bragg period structured optical fiber.
Fig. 2 is a weak Bragg reflection periodic structure optical fiber structure synoptic diagram of the present invention.Among the figure: among the figure: 1. sampled grating distributed bragg reflector (SG-DBR) tunable laser; 2. wavelength tuning control circuit; 3. impulse function generator; 4. electrooptic modulator; 5. optoisolator; 6. optical circulator; 7. weak Bragg reflection periodic structure optical fiber (WBF); 8. photo-detector; 9. data collecting card; 10. data analysis facilities; 11. be added with the reference grating of protective device; 12. entirely with weak Bragg reflection periodic structure (WBRS); 13. UV transparent coat; 14. weak Bragg reflection periodic structure; 15. fiber core.
Embodiment
The invention provides distributed sensing alarm method and system thereof based on weak Bragg reflection periodic structure optical fiber.
The present invention carves on long-distance optical fiber a series of entirely with weak Bragg reflection structure (WBRS), as the sensing unit of system.First WBRS is reference unit (11 among Fig. 1), places in the constant protective device of environment maintenance, and its centre wavelength is as the reference wavelength, and the centre wavelength of other WBRS is all judged wavelength shift as standard.Adopt sampled grating distributed bragg reflector (SG-DBR) tunable laser as system source, driven by the wavelength tuning control circuit, program control output wavelength is by channel spacing that configures and slew rate change.SG-DBR belongs to the current-injecting laser instrument, can reach very high tuning performance: tuning bandwidth 30nm, channel spacing 1pm, wavelength Conversion time 100ns, live width 4MHz.The arrowband direct current light of SG-DBR laser instrument output becomes pulsed light by the electrooptic modulator that is driven by impulse function generator, through optoisolator and the weak Bragg reflection periodic structure optical fiber (WBF) of optical circulator incident.The back scattering pulsed light of WBRS is coupled into photo-detector by optical circulator.The output electric signal of wavelength tuning control circuit, impulse function generator and detector calculates the distributed sensing testing result, and sends the abnormal alarm signal through data acquisition and signal analysis.
The present invention adopts high-speed, multi-path synchronous data collection card to gather the output electric signal of wavelength tuning control circuit, impulse function generator and detector, then three road signals is sent into computing machine and carries out data analysis.The output signal reflection laser instrument excitation wavelength of wavelength tuning control circuit over time, the pulse train distribution in time of the output signal reflection incident WBF of impulse function generator, the back scattering light signal over time among the output signal reflection WBF of detector.Carve n+1 WBRS on the optical fiber in the compartment of terrain, wherein first is reference unit.If the wavelength tuning cycle is T
d=mT
0, each wavelength retention time is T
0Wavelength tuning speed is consistent with the pulsed modulation repetition frequency, promptly at each T
0In only launch a light pulse.With pulse launch time be benchmark, if WBRPS can be to the light pulse reflection of emission, then photo-detector should postpone τ respectively
0, τ
1, τ
2..., τ
nTime location detect reflection light pulse.Therefore in this case, the centre wavelength of WBRPS is all relevant with the time with the locus, though the reflected signal light intensity that detects of photo-detector only changes in time, essence is closely bound up with WBRPS centre wavelength and position.At each T
0In, write down reflected signal respectively at τ
0, τ
1, τ
2..., τ
nThe light intensity value of time location is then in the whole tuning period T of wavelength
dIn, will record each WBRPS to wavelength X
1～λ
mReflectivity, so obtain the reflectance spectrum of each WBRPS.Since every extraneous parameter effect difference that WBRPS is subjected to, corresponding reflectance spectrum centre wavelength difference.Central wavelength lambda with sensing unit WBRPS
Ri(i=1,2,3 ... n) with the central wavelength lambda of reference unit WBRPS
R0The centre wavelength drift of making comparisons and can calculate every WBRPS, thus field distribution obtained." optical wavelength Time Domain Reflectometry (OWTDR) " notion is proposed thus, promptly according to light signal in wavelength domain and time domain two-dimensional space the data analysis sensing and locate the distribution of parameter to be measured.
Coupling takes place and the optical fiber filter of reflection specific wavelength in WBRS between the opposite pattern of a kind of transmission direction, when being subjected to the influencing of the temperature of external environment, stress, strain or vibration, the centre wavelength of the weak reflectance spectrum in its arrowband takes place by linear moving.With the stress sensing is example, the centre wavelength of WBRS
With stress
The linear changing relation be
Wherein,
Be stress
The centre wavelength that causes moves,
Elasto-optical coefficient for optical fiber.
Adopt full WBRS together as sensing unit, the whole bandwidth of light source can all offer any WBRS, and the dynamic range of measurement and multiplexing capacity can improve greatly.But complete all in full accord with centre wavelength and the stress characteristics of WBRS, therefore can't pass through Wavelength-encoding.In order when measuring, to differentiate the locus, use for reference the positioning principle of OTDR technology, the direct current light of light source output is gone up the interior WBRS array of carving through importing WBF after the pulsed modulation, and the time delay of measuring back scattering light pulse and input optical pulse just can calculate the locus of reflecting WBRS.Adopt the high precision tunable laser as the sensor-based system light source, realize length scanning.The output wavelength of program control tuned laser changes periodically continuously, and each constantly only exports the light of certain specific wavelength, if the centre wavelength that WBRS arranged consistent wavelength therewith, then to the input optical pulse reflection, otherwise transmission fully.The wavelength of laser instrument changes one-period continuously in tuning bandwidth, all values in the whole measurement range of corresponding traversal, thus can measure WBF field distribution along the line.
Be described in further detail preferred implementation of the present invention below in conjunction with accompanying drawing.
The invention provides a kind of distributing optical fiber sensing method, it is characterized in that optical wavelength Time Domain Reflectometry type sensing: adopt SG-DBR tuned laser 1 as system source based on weak Bragg reflection structured optical fiber, drive by wavelength tuning control circuit 2, program control output wavelength is by channel spacing that configures and slew rate change, the arrowband direct current light that this light source is exported after ovennodulation changes pulsed light into by the electrooptic modulator 4 that is driven by impulse function generator 3, and described pulsed light is through optoisolator 5 and optical circulator 6 incident WBF 7.Weak reflection Bragg reflection structured optical fiber (WBF) the 7th is carved with the periodically optical fiber of antiradar reflectivity Bragg grating, and the back scattering pulsed light that WBRS produces in this optical fiber 7 enters photo-detector 8 by optical circulator 6.And the output electric signal of wavelength tuning control circuit 2, impulse function generator 3 and photo-detector 8 is sent into data analysis facilities 10 after data collecting card 9 is handled, and calculates the distributed sensing testing result after the analysis relatively, and sends the abnormal alarm signal.
The invention provides a kind of distributing optical fiber sensing localization method, it is characterized in that merging the optical wavelength Time Domain Reflectometry OWTDR type location of wavelength-modulated sensing technology and OTDR location technology: light source is exported the burst pulse sequence of certain repetition frequency, periodically continuous tuning variation of output wavelength simultaneously realizes length scanning from the source.At a time, the weak Bragg reflection structured optical fiber 7 of laser pulse input of specific wavelength, if some structural units 12 centre wavelength at this moment is because extraneous parameter function influence drifts to consistent with laser wavelength of incidence, then back scattering takes place in this periodic structure position in input optical pulse, the partial pulse light intensity is reflected, and arrives photodetector so return a light pulse; Otherwise incident light pulse can be to this kind structural unit of this wavelength reflection until running into the complete transmission transmission that goes ahead.On the one hand, by the relation between reflective light intensity and the optical maser wavelength, can computing center's wavelength shift, thus extrapolate the size of described extraneous parameter threshold; On the other hand,, can measure the time delay of reflection light pulse and input optical pulse, thereby calculate the locus of described extraneous parameter by reflective light intensity and the relation between the time.Laser wavelength changes one-period apace continuously in tuning bandwidth, therefore all values in the whole measurement range of corresponding traversal can be measured distribution type fiber-optic field distribution along the line, thereby measuring object is realized the location.
As shown in Figure 1, the invention provides a kind of distributed sensing warning system based on weak Bragg reflection structured optical fiber, it comprises SG-DBR tunable laser 1, impulse function generator 3, electrooptic modulator 4, optoisolator 5, optical circulator 6, WBF 7 and photodetector 8, and above-mentioned device connects and composes the sensing light path successively.Wherein, SG-DBR tunable laser 1 is by 2 controls of wavelength tuning control circuit, electrooptic modulator 4 is by impulse function generator 3 controls, and the electric signal of this two path control signal and photo-detector 8 outputs enters data collecting card 9 jointly, sends into data analysis facilities 10 after the processing; Weak 7 of Bragg reflection periodic structure optical fiber have reference grating 11 that is added with protective device and the WBRS that is layed in warning region 12 to constitute.
As shown in Figure 2, the present invention is based on weak Bragg reflection structured optical fiber (WBF) 7 and carry out sensing.Weak Bragg reflection structured optical fiber 7 comprises the fiber core 15 of outer field UV transparent coat 13 and internal layer.Weak Bragg reflection structured optical fiber (WBF) the 7th, a kind of special sensor fibre, Bragg reflection structure (WBRS) 14 a little less than sequence distributes on its fiber core 15, these reflection configurations are inscribed on optical fiber continuously by the UV-irradiation mode, splice loss, splice attenuation when having avoided single fiber-optic grating sensor to be connected in series can be realized longer distance sensing and sensor multiplexing number.
The index modulation intensity and the grating length of weak Bragg reflection structure (WBRS) of the present invention are littler than common bragg grating, and the centre wavelength reflectivity is low to moderate below 10%.
Weak Bragg reflection periodic structure optical fiber of the present invention is based on the carrier optical fiber designs of coat to 355nm wavelength UV transparent, and certain at interval delay optical fiber, continuous distribution a series of physical arrangements and the identical weak Bragg reflection periodic structure 14 of optical characteristics on it.The physical substance of this structure is that the fiber core refractive index is periodic distribution, but the index modulation degree of depth and length flexible design.The optical characteristics of this structure shows as, to the broadband light (P of incident
In) in certain wavelength reflection (P
s), and to the whole transmission (P of other wavelength
t), but different with the strong reflection of Bragg grating, its transport property is the weak reflection of a kind of narrow bandwidth, so we are referred to as " weak Bragg reflection periodic structure ".When the flashlight incident optical, when arriving weak Bragg reflection periodic structure position, wherein fainter a part of light is by the centre wavelength periodic structure reflection consistent with signal light wavelength, and remaining most of light continues to transmit forward until arriving the next cycle locations of structures.These structures to external world parameter for example temperature, STRESS VARIATION have sensitivity characteristic, can be used as sensing unit.Therefore whole optical fiber shows as and can carry out distributed perception detection to optical fiber extraneous parameter along the line, therefore is called " distributed sensing fiber ".
According to coupled wave theory and transmission matrix analytical approach, the centre wavelength reflectivity of Fiber Bragg Grating FBG
And bandwidth
By index modulation intensity and grating length decision, promptly
Wherein,
Be coupling coefficient,
Be grid region length,
Be the index modulation amplitude of fibre core in the fiber grating,
Be the cycle of grating,
Be the effective refractive index of communication mode in the optical fiber,
Be Bragg(Prague) centre wavelength.
According to formula (2), (3), can be by changing the weak Bragg reflection periodic structure of different centre wavelengths of index modulation intensity and reflectivity with the modulator zone Design of length.The Bragg reflection periodic structure that adopts weak photosensitivity optical fiber and appearance position template construct specific reflectance, bandwidth is fully feasible.Can obtain the intensity of ultraviolet lighting and the length that scanning is inscribed by theoretical analysis and calculation, and produce reflectivity and be weaker than 1% weak Bragg reflection periodic structure.
Above-mentioned embodiment only limits to further specify of the present invention, does not constitute the qualification to technical solution of the present invention.
Claims (3)
1. based on the distributed sensing system of weak Bragg reflection structured optical fiber, it is characterized in that: it comprises SG-DBR tunable laser (1), electrooptic modulator (4), optoisolator (5), optical circulator (6), weak Bragg reflection periodic structure optical fiber (7), and they link to each other successively; SG-DBR tunable laser (1) is controlled by wavelength tuning control circuit (2), electrooptic modulator (4) is controlled by impulse function generator (3), also be connected to photo-detector (8) on the optical circulator (6), the electric signal of the control signal of wavelength tuning control circuit (2) and electrooptic modulator (4) output and photo-detector (8) output enters data collecting card (9) jointly, sends into data analysis facilities (10) after the processing.
2. distributed sensing system according to claim 1; it is characterized in that: weak Bragg reflection periodic structure optical fiber (7) comprises the continuous successively reference grating (11) that is added with protective device and entirely with weak Bragg reflection periodic structure (12), optical circulator (6) is connected to the reference grating (11) that is added with protective device.
3. distributed sensing system according to claim 1, it is characterized in that: weak Bragg reflection structured optical fiber (7) comprises the fiber core (15) of outer field UV transparent coat (13) and internal layer, and fiber core (15) is gone up the weak Bragg reflection structure (14) of sequence distribution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105903567A CN102102998A (en) | 2010-12-16 | 2010-12-16 | Distributed sensing system based on weak Bragg reflection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105903567A CN102102998A (en) | 2010-12-16 | 2010-12-16 | Distributed sensing system based on weak Bragg reflection structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102102998A true CN102102998A (en) | 2011-06-22 |
Family
ID=44155934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105903567A Pending CN102102998A (en) | 2010-12-16 | 2010-12-16 | Distributed sensing system based on weak Bragg reflection structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102102998A (en) |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269911A (en) * | 2011-09-15 | 2011-12-07 | 武汉朗睿科技有限公司 | Optical demodulation method based on OTDR (Optical Time Domain Reflectometry) technology and optical demodulation device thereof |
| CN102374873A (en) * | 2011-09-19 | 2012-03-14 | 武汉邮电科学研究院 | Sensing system based on optical OFDM (Orthogonal Frequency Division Multiplexing) and FBG (Fiber Bragg Grating) monitoring method thereof |
| CN102506916A (en) * | 2011-11-22 | 2012-06-20 | 武汉邮电科学研究院 | Distributed sensor network using weak reflection fiber Bragg grating (FBG) and precise positioning method of each FBG |
| CN102519499A (en) * | 2011-12-14 | 2012-06-27 | 华中科技大学 | Micro-structure fiber optic Fabry-Perot cavity quasi based quasi-distributed sensor |
| CN102538846A (en) * | 2011-12-14 | 2012-07-04 | 北京航空航天大学 | Phase-sensitive optical time domain reflectometer type optical fiber distributed disturbing sensor of double-arm pulse optical interference |
| CN103674086A (en) * | 2013-12-20 | 2014-03-26 | 武汉理工大学 | Method and device for measuring temperature and strain of isotactic ultralow-reflectivity optical fiber gratings simultaneously based on Brillouin scattering |
| CN104011508A (en) * | 2011-12-20 | 2014-08-27 | 洛桑联邦理工学院 | Fiber sensing system based on a bragg grating and optical time domain reflectometry |
| CN104990620A (en) * | 2015-07-03 | 2015-10-21 | 南京大学 | Fiber bragg grating array-based phase-sensitive optical time domain reflection device and method |
| CN105181111A (en) * | 2015-09-21 | 2015-12-23 | 电子科技大学 | Ultraweak fiber bragg grating array and Phi-OTDR combined optical fiber vibration sensing system |
| CN106441385A (en) * | 2016-08-31 | 2017-02-22 | 武汉理工光科股份有限公司 | Wavelength-all-same fiber grating spectrum demodulation method and fiber grating demodulation system |
| CN106768268A (en) * | 2016-11-18 | 2017-05-31 | 电子科技大学 | The optical fiber vibration sensing system that a kind of low reflection oblique raster array is combined with Φ OTDR |
| CN106895903A (en) * | 2017-03-10 | 2017-06-27 | 天津大学 | Low-frequency vibration detection method based on DBR fiber gratings |
| CN108519166A (en) * | 2018-03-02 | 2018-09-11 | 武汉理工大学 | A kind of positioning of optical fiber optical grating array intelligent vibration and temperature monitoring system |
| CN109506688A (en) * | 2019-01-04 | 2019-03-22 | 桂林电子科技大学 | Based on fiber Bragg grating sensor measuring system and method |
| CN109724685A (en) * | 2018-12-10 | 2019-05-07 | 武汉理工大学 | Fiber grating underwater sound sensing array demodulation method and system based on Fizeau interference |
| CN109855660A (en) * | 2018-11-22 | 2019-06-07 | 天津大学 | A method of reducing channel spacing in fiber grating wavelength-division multiplex group network system |
| CN111024370A (en) * | 2019-11-28 | 2020-04-17 | 北京航天控制仪器研究所 | Dynamic calibration device and method for wavelength scanning working curve of tunable laser |
| CN111578152A (en) * | 2020-05-09 | 2020-08-25 | 安徽中科智泰光电测控科技有限公司 | Oil-gas pipeline monitoring real-time clustering early warning method based on mass vibration interference events |
| CN111707302A (en) * | 2015-03-06 | 2020-09-25 | 希里克萨有限公司 | Optical fiber distributed sensor system |
| CN111811636A (en) * | 2020-07-23 | 2020-10-23 | 电子科技大学 | Vibration broadband measurement system and method based on multi-wavelength weak inverse structure sensing optical fiber |
| CN115060186A (en) * | 2022-08-05 | 2022-09-16 | 武汉理工大学 | Bridge girder safety monitoring system and method based on weak reflectivity grating array |
| CN115265928A (en) * | 2022-07-07 | 2022-11-01 | 浙大宁波理工学院 | Optical fiber structure for positioning liquid leakage and distributed liquid leakage positioning system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005024349A1 (en) * | 2003-09-08 | 2005-03-17 | Donam Systems Inc. | Fiber bragg grating sensor system |
-
2010
- 2010-12-16 CN CN2010105903567A patent/CN102102998A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005024349A1 (en) * | 2003-09-08 | 2005-03-17 | Donam Systems Inc. | Fiber bragg grating sensor system |
Non-Patent Citations (2)
| Title |
|---|
| 《中国博士学位论文全文数据库 信息科技辑》 20091215 孙琪真 分布式光纤传感与信息处理技术的研究及应用 , 第12期 * |
| 孙琪真: "分布式光纤传感与信息处理技术的研究及应用", 《中国博士学位论文全文数据库 信息科技辑》, no. 12, 15 December 2009 (2009-12-15) * |
Cited By (36)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269911A (en) * | 2011-09-15 | 2011-12-07 | 武汉朗睿科技有限公司 | Optical demodulation method based on OTDR (Optical Time Domain Reflectometry) technology and optical demodulation device thereof |
| CN102374873A (en) * | 2011-09-19 | 2012-03-14 | 武汉邮电科学研究院 | Sensing system based on optical OFDM (Orthogonal Frequency Division Multiplexing) and FBG (Fiber Bragg Grating) monitoring method thereof |
| CN102374873B (en) * | 2011-09-19 | 2014-06-04 | 武汉邮电科学研究院 | Sensing system based on optical OFDM (Orthogonal Frequency Division Multiplexing) and FBG (Fiber Bragg Grating) monitoring method thereof |
| CN102506916A (en) * | 2011-11-22 | 2012-06-20 | 武汉邮电科学研究院 | Distributed sensor network using weak reflection fiber Bragg grating (FBG) and precise positioning method of each FBG |
| CN102506916B (en) * | 2011-11-22 | 2014-06-04 | 武汉邮电科学研究院 | Distributed sensor network using weak reflection fiber Bragg grating (FBG) and precise positioning method of each FBG |
| CN102519499B (en) * | 2011-12-14 | 2015-08-05 | 华中科技大学 | Based on the quasi-distributed sensor of micro-structure fiber optic Fabry-Perot cavity quasi |
| CN102519499A (en) * | 2011-12-14 | 2012-06-27 | 华中科技大学 | Micro-structure fiber optic Fabry-Perot cavity quasi based quasi-distributed sensor |
| CN102538846A (en) * | 2011-12-14 | 2012-07-04 | 北京航空航天大学 | Phase-sensitive optical time domain reflectometer type optical fiber distributed disturbing sensor of double-arm pulse optical interference |
| CN102538846B (en) * | 2011-12-14 | 2015-02-04 | 北京航空航天大学 | Method for calculating location of sensor fibre |
| CN104011508A (en) * | 2011-12-20 | 2014-08-27 | 洛桑联邦理工学院 | Fiber sensing system based on a bragg grating and optical time domain reflectometry |
| CN103674086A (en) * | 2013-12-20 | 2014-03-26 | 武汉理工大学 | Method and device for measuring temperature and strain of isotactic ultralow-reflectivity optical fiber gratings simultaneously based on Brillouin scattering |
| CN103674086B (en) * | 2013-12-20 | 2016-03-30 | 武汉理工大学 | Measure entirely with method and the device of weak optical fiber Bragg grating temperature and strain based on Brillouin scattering simultaneously |
| CN111707302A (en) * | 2015-03-06 | 2020-09-25 | 希里克萨有限公司 | Optical fiber distributed sensor system |
| CN111707302B (en) * | 2015-03-06 | 2024-03-08 | 希里克萨有限公司 | Optical fiber distributed sensor system |
| US11719560B2 (en) | 2015-03-06 | 2023-08-08 | Silixa Ltd. | Method and apparatus for optical sensing |
| CN104990620A (en) * | 2015-07-03 | 2015-10-21 | 南京大学 | Fiber bragg grating array-based phase-sensitive optical time domain reflection device and method |
| CN104990620B (en) * | 2015-07-03 | 2018-06-08 | 南京大学 | Phase sensitivity optical time domain reflecting device and method based on bragg grating array |
| CN105181111A (en) * | 2015-09-21 | 2015-12-23 | 电子科技大学 | Ultraweak fiber bragg grating array and Phi-OTDR combined optical fiber vibration sensing system |
| CN106441385A (en) * | 2016-08-31 | 2017-02-22 | 武汉理工光科股份有限公司 | Wavelength-all-same fiber grating spectrum demodulation method and fiber grating demodulation system |
| CN106441385B (en) * | 2016-08-31 | 2018-11-23 | 武汉理工光科股份有限公司 | Wavelength is entirely the same as optical fiber grating spectrum demodulation method and system |
| CN106768268A (en) * | 2016-11-18 | 2017-05-31 | 电子科技大学 | The optical fiber vibration sensing system that a kind of low reflection oblique raster array is combined with Φ OTDR |
| CN106895903A (en) * | 2017-03-10 | 2017-06-27 | 天津大学 | Low-frequency vibration detection method based on DBR fiber gratings |
| CN108519166A (en) * | 2018-03-02 | 2018-09-11 | 武汉理工大学 | A kind of positioning of optical fiber optical grating array intelligent vibration and temperature monitoring system |
| CN109855660A (en) * | 2018-11-22 | 2019-06-07 | 天津大学 | A method of reducing channel spacing in fiber grating wavelength-division multiplex group network system |
| CN109724685A (en) * | 2018-12-10 | 2019-05-07 | 武汉理工大学 | Fiber grating underwater sound sensing array demodulation method and system based on Fizeau interference |
| CN109724685B (en) * | 2018-12-10 | 2021-01-19 | 武汉理工大学 | Fiber grating underwater acoustic sensing array demodulation method and system based on Fizeau interference |
| CN109506688A (en) * | 2019-01-04 | 2019-03-22 | 桂林电子科技大学 | Based on fiber Bragg grating sensor measuring system and method |
| CN109506688B (en) * | 2019-01-04 | 2023-09-26 | 桂林电子科技大学 | Fiber Bragg grating sensor-based measurement system and method |
| CN111024370A (en) * | 2019-11-28 | 2020-04-17 | 北京航天控制仪器研究所 | Dynamic calibration device and method for wavelength scanning working curve of tunable laser |
| CN111578152A (en) * | 2020-05-09 | 2020-08-25 | 安徽中科智泰光电测控科技有限公司 | Oil-gas pipeline monitoring real-time clustering early warning method based on mass vibration interference events |
| CN111578152B (en) * | 2020-05-09 | 2022-02-18 | 安徽中科智泰光电测控科技有限公司 | Oil-gas pipeline monitoring real-time clustering early warning method based on mass vibration interference events |
| CN111811636A (en) * | 2020-07-23 | 2020-10-23 | 电子科技大学 | Vibration broadband measurement system and method based on multi-wavelength weak inverse structure sensing optical fiber |
| CN115265928A (en) * | 2022-07-07 | 2022-11-01 | 浙大宁波理工学院 | Optical fiber structure for positioning liquid leakage and distributed liquid leakage positioning system |
| CN115265928B (en) * | 2022-07-07 | 2023-10-03 | 浙大宁波理工学院 | Optical fiber structure for liquid leakage positioning and distributed liquid leakage positioning system |
| CN115060186B (en) * | 2022-08-05 | 2023-01-17 | 武汉理工大学 | Bridge girder safety monitoring system and method based on weak reflectivity grating array |
| CN115060186A (en) * | 2022-08-05 | 2022-09-16 | 武汉理工大学 | Bridge girder safety monitoring system and method based on weak reflectivity grating array |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102102998A (en) | Distributed sensing system based on weak Bragg reflection structure | |
| CN102914321B (en) | Ultra-low fiber bragg grating sensing system and query method thereof | |
| CN100561144C (en) | Distributed optical fiber vibration sensing method and device | |
| CN103063242A (en) | Real-time monitoring system and method based on optical time domain reflection and fiber grating distributed type | |
| CN102052930B (en) | Fiber grating distributed strain sensor and strain monitoring method thereof | |
| EP0983486B1 (en) | Distributed sensing system | |
| CN102506904B (en) | Spontaneous Brillouin scattering optical time domain reflectometer based on superconductive nanowire single-proton detector | |
| CN102798411B (en) | System and method for distributed optical fibre sensing measurement based on Brillouin scattering | |
| CN105547460B (en) | Merge the dipulse phase sensitive optical time domain reflectometer and its method of weak reflecting grating | |
| CN101441092B (en) | Perimeter protection sensing positioning system based on coherent light time domain reflection | |
| CN105806465B (en) | A kind of novel Φ-OTDR detection device and its detection method based on fixation reflex point | |
| CN103364070B (en) | Fiber bragg grating vibration sensing system based on volume phase grating demodulation | |
| CN102506912A (en) | Optical fiber distributed disturbance sensor | |
| CN105973450B (en) | Optical fiber Fizeau interference arrays distributed vibration sensing system and method | |
| CN101634571B (en) | Optical pulse raster distributed fiber sensing device | |
| CN106525091A (en) | Fiber grating array sensing demodulation system based on multi-wavelength pulse differential modulation | |
| CN104567958A (en) | Distributed micro-structure sensor network based on time division and wavelength division multiplexing and using method thereof | |
| CN107036733A (en) | The many reference amounts Distributed Measurement System and measuring method of twin-core dim light grid array based on dark pulse light source | |
| CN102506916B (en) | Distributed sensor network using weak reflection fiber Bragg grating (FBG) and precise positioning method of each FBG | |
| CN101738216A (en) | Single fiber multiplexing method of identical low-reflectivity fiber gratings | |
| CN102269911A (en) | Optical demodulation method based on OTDR (Optical Time Domain Reflectometry) technology and optical demodulation device thereof | |
| CN103267590A (en) | Locating temperature measuring device combining fiber gratings and distributed optical fibers | |
| CN102102999B (en) | Sensing multiplexing system based on non-equidistant weak Bragg reflection fiber Bragg grating array | |
| CN207036297U (en) | A kind of optical fiber grating temperature-measuring system | |
| CN102928740A (en) | Intelligent collection type fault diagnosis and on-line temperature measuring system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20110622 |