CN101639379A - Vibration monitoring structure and method based on optical fiber polarized light time domain reflection sense - Google Patents
Vibration monitoring structure and method based on optical fiber polarized light time domain reflection sense Download PDFInfo
- Publication number
- CN101639379A CN101639379A CN200910034226A CN200910034226A CN101639379A CN 101639379 A CN101639379 A CN 101639379A CN 200910034226 A CN200910034226 A CN 200910034226A CN 200910034226 A CN200910034226 A CN 200910034226A CN 101639379 A CN101639379 A CN 101639379A
- Authority
- CN
- China
- Prior art keywords
- detector
- optical fiber
- coupling mechanism
- analyzer
- input end
- 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
- 239000013307 optical fiber Substances 0.000 title claims abstract description 44
- 238000012544 monitoring process Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000001228 spectrum Methods 0.000 claims abstract description 14
- 230000008878 coupling Effects 0.000 claims description 50
- 238000010168 coupling process Methods 0.000 claims description 50
- 238000005859 coupling reaction Methods 0.000 claims description 50
- 230000007246 mechanism Effects 0.000 claims description 50
- 238000001514 detection method Methods 0.000 claims description 31
- 239000000835 fiber Substances 0.000 claims description 28
- 238000005259 measurement Methods 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 13
- 230000001427 coherent effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000000284 extract Substances 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000010183 spectrum analysis Methods 0.000 claims description 3
- 230000036962 time dependent Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 230000010287 polarization Effects 0.000 abstract description 33
- 230000003287 optical effect Effects 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000005690 magnetoelectric effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Images
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention relates to a vibration monitoring structure based on optical fiber polarized light time domain reflection sense, comprising a laser (1), a first coupler (2), a second coupler (7), a third coupler (8), a fourth coupler (11), a fifth coupler (13), an acoustic optical modulator (3), a polarizer (4), a circulator (5), a sensing optical fiber (6), a first analyzer (9), a second analyzer (10), a first detector (12), a second detector (14), a first low-pass filter (15), a second low-pass filter (16), a first analog-to-digital converter (17), a second analog-to-digital converter (18), anFPGA (19) and a microprocessor MCU (20); the method comprises the following steps: measuring the changes of the polarization state of each optical fiber section with time according to a plurality ofmeasurements, combining Fourier transformation technology to obtain frequency spectrum information, and analyzing the frequency spectrum information to obtain vibration information. Compared with theprevious method which is adopted by a POTDR system and carries out iteration operation on polarization state, the method has the advantages of simple algorithm and small data operation and greatly reduces monitoring time and cost of the system.
Description
Technical field
The present invention is a kind of sensing equipment and method that is used for vibration frequency and intensity monitoring, especially a kind of vibration monitoring specialized equipment with distributed measurement and vibration monitoring method based on optical fiber polarized light time domain reflection sense.
Background technology
In the health monitoring of bridge, pipeline, many potential danger often are presented as certain mechanical vibration form.Such as rocking of bridge, the motion of construction machinery etc. around the pipeline.If can carry out on-line monitoring, just can realize early warning to potential danger to the vibration situation.
Traditional vibration transducer mainly utilizes magnetoelectric effect and piezoelectric effect that vibration signal is converted to electric signal and measures.Mainly there is following some deficiency in this metering system:
At first, this metering system can only be supported the quasi-distributed measurement that single-point or a plurality of point are connected, can not carry out real distributed measurement, in the measurement application scenario of long distance, large space scope, its spatial resolution and all can be restricted to the detection sensitivity of microvibration.
Secondly, this metering system is subject to the influence of electromagnetic interference (EMI), and the own corrosion-vulnerable of sensor, shorter in the abominable following life-span of applied environment, makes the application scenario of this sensing mode be subjected to bigger restriction.
,, in current health detection, obtained to use widely because have advantages such as the full distributed measurement of support, anti-electromagnetic interference (EMI), corrosion-resistant, good endurance based on optical time domain reflectometer (OTDR) detection mode of optical fiber.
But common OTDR system, what pay close attention in measurement only is the variation of backscattering light intensity in the optical fiber, insensitive for mechanical vibration, is difficult to be applied in the occasion that need detect mechanical vibration.But the backscattering polarization state of light is very responsive to the mechanical vibration of outer fiber in the optical fiber.Change by backscattering polarization state of light in polarized light time domain reflection sense (POTDR) detection fiber, just might realize Distributed Detection along the mechanical vibration of fiber distribution.
The POTDR system of current use, in to the detection of polarization state, adopt the single channel analyzer to detect the projection value of polarized light on single direction, when the angle of flashlight polarization direction and projecting direction is spent near 90, its projection power will become very little, thereby make accuracy of detection reduce, generally claim this situation for entering the dead band state.Simultaneously current POTDR system mainly relies on recursive operation for the detection of scatter light polarization attitude, its algorithm complexity, and measuring period is long, and response speed is slow.
Summary of the invention
Technical matters: technical matters to be solved by this invention is to provide a kind of highly sensitive, and the vibration monitoring structure and the method based on optical fiber polarized light time domain reflection sense of testing result can be provided fast.
Technical scheme: the invention provides a kind of vibration monitoring structure based on optical fiber polarized light time domain reflection sense, structurally comprise laser instrument, first coupling mechanism, second coupling mechanism, the 3rd coupling mechanism, the 4th coupling mechanism, the 5th coupling mechanism, acousto-optic modulator, the polarizer, circulator, sensor fibre, first analyzer and second analyzer, first detector and second detector, first low-pass filter and second low-pass filter, first analog to digital converter and second analog to digital converter, FPGA, microprocessor MCU;
When laser instrument is internal modulated laser,
The output terminal of laser instrument connects the input end of circulator, the input end of output termination the 3rd coupling mechanism of circulator, the output terminal of the 3rd coupling mechanism divides two-way, first analyzer of wherein leading up to connects second input end of the first balance detection device, another road connects second input end of second detector, a termination circulator of sensor fibre by second analyzer;
First detector, second detector are the unbalanced detector, first low-pass filter that the output terminal of first detector is connected in series by order, the first input end that first analog to digital converter meets FPGA; Second low-pass filter that the output terminal of second detector is connected in series by order, second input end that second analog to digital converter meets FPGA, the output termination microprocessor MCU of FPGA.
When laser instrument was common lasers, first detector, second detector were the balanced type detector,
Output termination first coupling mechanism of laser instrument, the output of first coupling mechanism divides two-way, wherein the first via is further divided into two branch roads by second coupling mechanism, first branch road connects the first input end of first detector by the 4th coupling mechanism, and second branch road connects the first input end of second detector by the 5th coupling mechanism;
Acousto-optic modulator, the polarizer, the circulator that another road of first coupling mechanism output is connected in series by order connects the input end of the 3rd coupling mechanism, the output terminal of the 3rd coupling mechanism divides two-way, first analyzer of wherein leading up to connects second input end of first detector, another road connects second input end of second detector, a termination circulator of sensor fibre by second analyzer;
First low-pass filter that the output terminal of first detector is connected in series by order, the first input end that first analog to digital converter meets FPGA; Second low-pass filter that the output terminal of second detector is connected in series by order, second input end that second analog to digital converter meets FPGA, the output termination microprocessor MCU of FPGA.
Between acousto-optic modulator and circulator, be connected with the polarizer.
Vibration monitoring method based on optical fiber polarized light time domain reflection sense comprises step:
Step 1: laser instrument sends the continuous light of power invariability, is divided into two-way by coupling mechanism, and the coupling mechanism branch of wherein leading up to is made two-way local oscillator light, another road forms pulsed light by the modulation of acousto-optic modulator, send into circulator partially by rising of the polarizer, survey light and inject sensor fibre by circulator
Step 2: the backscattering light signal that produces in the sensor fibre is sent into coupling mechanism by circulator, the output of coupling mechanism is divided into two-way, carry out analyzing through first analyzer and second analyzer respectively, first analyzer and second analyzer analyzer of quadrature each other wherein, its output is done coherent detection with local oscillator light on first detector and second detector
Step 3: result of detection sends into first analog to digital converter by the filtering of first low-pass filter and second low-pass filter and second analog to digital converter is done analog to digital conversion,
Step 4:FPGA carries out pre-service to the data that collect, and improves signal to noise ratio (S/N ratio),
Step 5: microprocessor MCU carries out Fourier transform to pretreated result, obtains the change frequency of signal intensity on the different polarization direction,
Step 6: dominant frequency frequency and distribution pattern to the frequency spectrum that obtains are analyzed, and obtain the variation characteristic of vibration source.
Described step 2 adopts first analyzer and the second analyzer acting in conjunction of orthogonality relation each other, avoids the generation of dead band phenomenon.
Described step 5, specifically comprise and extract the result of each section in repeatedly measuring in the optical fiber, obtain back-scattering light time-dependent variation in intensity rule on the different polarization direction at each section on the optical fiber, the intensity data that the analyzer output terminal is risen and fallen carries out spectrum analysis, the frequency spectrum that obtains vibrating.
Described step 6 is wherein analyzed the dominant frequency frequency of frequency spectrum and is specifically comprised optical fiber is carried out real-time on-line monitoring, obtains each section vibration frequency change on the optical fiber; The result and the historical record that measure are each time compared, then illustrate along the vibration source frequency of fiber distribution variation has taken place if measurement result is compared with historical record to have taken place to change.
Described step 6, wherein the distribution pattern of frequency spectrum is analyzed and specifically comprised optical fiber is carried out real-time on-line monitoring, obtain each section vibration frequency distribution pattern on the optical fiber, it mainly is the variation that energy distributes on fundamental frequency and each harmonic, the result and the historical record that measure are each time compared, if measurement result is compared with historical record to change and illustrated that then the oscillation intensity along fiber distribution changes.
Beneficial effect: because the present invention adopts optical fiber as sensor,, have the advantages that to support distributed measurement, and have advantages such as anti-electromagnetic interference (EMI), corrosion-resistant, good endurance compared to traditional magnetoelectricity/piezoelectric type vibration transducer.
The present invention obtains spectrum information in conjunction with the Fourier transform technology again by repeatedly measuring each section polarization state of optical fiber situation over time, the information that obtains vibrating by the analysis to spectrum information.This method is carried out the method for interative computation compared to what before this POTDR system adopted to polarization state, has the advantage that algorithm is simple, data operation quantity is little, significantly reduced required detection time and the cost of system, made and utilize the scheme that the detection of back-scattering light polarization state is vibrated along fiber distribution in the optical fiber to have the possibility of practical application.The detection dead band of eliminating in the polarization state detection by the polarization state light signal intensity that detects two orthogonal directionss simultaneously occurs
Description of drawings
Fig. 1 is a system chart of the present invention.Wherein have: laser instrument 1, first coupling mechanism 2, second coupling mechanism 7, the 3rd coupling mechanism 8, the 4th coupling mechanism 11, the 5th coupling mechanism 13, acousto-optic modulator 3, the polarizer 4, circulator 5, sensor fibre 6, the first analyzers 9 and second analyzer, 10, the first detectors 12 and second detector 14, first low-pass filter 15 and second low-pass filter 16, first analog to digital converter 17 and second analog to digital converter 18, FPGA 19, microprocessor MCU20.
Fig. 2 is the synoptic diagram of quadrature analyzing effect.
Embodiment
A kind ofly comprised optical transmission module based on the vibration frequency of POTDR and the detection architecture of intensity, light is accepted module, detection fiber, control module, signal processing unit; Described optical transmission module has comprised the laser instrument that is used to launch firm power laser, has been used for laser is carried out pulse modulated acousto-optic modulator, is used for laser is played inclined to one side Polarization Controller; Described light is accepted module and has been comprised the analyzer that is used for the detection laser polarization state, has been used for light signal is converted to balance detection device that electric signal carries out Coherent Detection, is used to remove the low-pass filter of interference and is used for the analog electrical signal sample conversion to be the analog to digital converter of digital signal; Described detection fiber comprised be used to control laser current to circulator and be used to carry out the sensor fibre of vibration monitoring sensing; Described signal processing unit is used to accept the digital signal of Optical Receivers output, and obtains polarization state rule over time according to digital signal; Described control module is used to analyze the Changing Pattern of polarization state, obtains the variation of the external parameters such as temperature, vibration or stress with fiber distribution.
The present invention also provides a kind of distributed method for testing vibration, is applied to aforesaid monitoring system, comprises step:
1) laser of the constant optical power sent of laser instrument is through pulsed modulation with rise and being injected in the sensor fibre partially.
2) Rayleigh scattering takes place in described pulse modulated detection light in sensor fibre, and back-scattering light wherein enters Optical Receivers by circulator.
3) the described branch of Rayleigh scattering light is dorsad made two-way, enters orthogonal two analyzers in polarization direction respectively, obtains the light components in the same way and the quadrature component light of polarized light.
4) described light components in the same way and quadrature component light carry out Coherent Detection at two balance detection devices and local oscillator light respectively, and light intensity is converted to electrical signal intensity.
5) analog to digital converter of Optical Receivers is a digital signal with aforementioned analog electrical signal intensity-conversion.
6) signal processing unit is accepted the digital signal of Optical Receivers output, and obtains the backscattering light intensity of optical fiber diverse location in the single measurement according to the time that digital signal and reflected light signal arrive.
7) measuring process of repetition above 1 to 6 takes multiple measurements, and extracts the result of each section in repeatedly measuring, and can obtain the back-scattering light time-dependent variation in intensity rule of each section on optical fiber.For single section, getting its backscattering light intensity that obtains in each time measured is raw data, carries out Fourier transform, obtains the spectrum information of its change in signal strength.Concrete former reason following formula provides:
P(t)＝PrCOS(ωt)
Pr is the energy summation of a certain section rayleigh backscattering signal on each polarization direction, ω is the angular frequency of extraneous mechanical vibration, the distribution on polarization state exerts an influence to the backscattering luminous energy for it, makes the direction of itself and analyzer produce size and is the angle of COS (ω t).Thereby at the output generation of analyzer and the intensity fluctuation P (t) of mechanical vibration frequency dependence.By the intensity data that rises and falls is carried out spectrum analysis, just can infer the frequency that vibration.
8), can obtain each section vibration frequency change on the optical fiber by optical fiber is carried out real-time on-line monitoring.The result and the historical record that measure are each time compared, just can infer variation has taken place along the vibration source of fiber distribution.For example, historical data shows that underground utilities vibration at ordinary times in somewhere mainly is that road surface automobile rolls the random vibration that causes, the a certain moment catches sight of its vibration and has become tens of hertz constant single vibration, can infer that then variation has taken place its external environment condition, probably be to have construction violating the regulations on every side, using the reciprocating drill excavated earth.
9), can obtain the variation of each section vibration frequency distribution pattern on the optical fiber by optical fiber is carried out real-time on-line monitoring.The result and the historical record that measure are each time compared, just can infer along the oscillation intensity of fiber distribution to change.This mainly is owing to work as the intensity increase of mechanical vibration, makes when the variation of polarization state angle is spent above 180, will produce a series of high-frequency harmonic component on testing result.For example, historical data shows that the vibration at ordinary times of certain bridge mainly is distributed in the f of hertz magnitude, and is less at the energy of high frequency distribution.The a certain moment catches sight of in the harmonic wave position of high frequencies such as 2f, 3f, 4f and higher energy distribution occurred, can infer that then acute variation has appearred in the Oscillation Amplitude of bridge this moment, and resonance phenomena has appearred in pontic probably.
10) by two analyzer x, the y acting in conjunction of orthogonality relation each other, can avoid the generation of dead band phenomenon among the conventional P OTDR.With reference to figure 2 (1), when backscattering polarization state of light and x, y are 45 when spending, the output light intensity of each analyzer is half of original signal, no matter uses which analyzer to measure separately and all has signal to noise ratio (S/N ratio) preferably.With reference to figure 2 (2), when the angle of backscattering polarization state of light and x direction was spent near 90, its projection on the x axle was very little, detect if only be suitable for a single analyzer x, then Ci Shi output power extremely a little less than, signal to noise ratio (S/N ratio) is very poor, system almost can't resoluting signal variation, entered the dead band.Yet since with the existence of the analyzer y of analyzer x quadrature, this moment, flashlight was very strong at the output end signal of analyzer y, still can keep good signal to noise ratio (S/N ratio).Like this, no matter how the signal polarization state of light distributes, and always has some output signal-to-noise ratios better in the analyzer of quadrature, has guaranteed the performance of system.
See also Fig. 1, vibration monitoring process of the present invention is as described below:
At first, implementation step one, the laser that laser instrument 1 sends was made two-way in 2 minutes by the 50:50 coupling mechanism, wherein one the tunnel outputed to 50:50 coupling mechanism 7 as local oscillator light, and another road enters acousto-optic modulator 3 and modulates as surveying light, obtains surveying the laser pulse of usefulness.This pulse through 4 of Polarization Controllers partially after, inject sensor fibres 6 by optical circulator 5.
Claims (8)
1. vibration monitoring structure based on optical fiber polarized light time domain reflection sense, it is characterized in that, structurally comprise laser instrument (1), first coupling mechanism (2), second coupling mechanism (7), the 3rd coupling mechanism (8), the 4th coupling mechanism (11), the 5th coupling mechanism (13), acousto-optic modulator (3), the polarizer (4), circulator (5), sensor fibre (6), first analyzer (9) and second analyzer (10), first detector (12) and second detector (14), first low-pass filter (15) and second low-pass filter (16), first analog to digital converter (17) and second analog to digital converter (18), FPGA (19), microprocessor MCU (20);
When laser instrument (1) is internal modulated laser,
The output terminal of laser instrument (1) connects the input end of circulator (5), the input end of output termination the 3rd coupling mechanism (8) of circulator (5), the output terminal of the 3rd coupling mechanism (8) divides two-way, first analyzer (9) of wherein leading up to connects second input end of the first balance detection device (12), another road connects second input end of second detector (14), a termination circulator (5) of sensor fibre (6) by second analyzer (10);
First detector (12), second detector (14) are the unbalanced detector, first low-pass filter (15) that the output terminal of first detector (12) is connected in series by order, the first input end that first analog to digital converter (17) connects FPGA (19); Second low-pass filter (16) that the output terminal of second detector (14) is connected in series by order, second input end that second analog to digital converter (18) meets FPGA (19), the output termination microprocessor MCU (20) of FPGA (19).
2. the vibration monitoring structure based on optical fiber polarized light time domain reflection sense according to claim 1, when it is characterized in that described laser instrument (1) for common lasers, first detector (12), second detector (14) they are the balanced type detector,
Output termination first coupling mechanism (2) of laser instrument (1), the output of first coupling mechanism (2) divides two-way, wherein the first via is further divided into two branch roads by second coupling mechanism (7), first branch road connects the first input end of first detector (12) by the 4th coupling mechanism (11), and second branch road connects the first input end of second detector (14) by the 5th coupling mechanism (13);
Acousto-optic modulator (3), the polarizer (4), the circulator (5) that another road of first coupling mechanism (2) output is connected in series by order connects the input end of the 3rd coupling mechanism (8), the output terminal of the 3rd coupling mechanism (8) divides two-way, first analyzer (9) of wherein leading up to connects second input end of first detector (12), another road connects second input end of second detector (14) by second analyzer (10), sensor fibre (6), a termination circulator (5);
First low-pass filter (15) that the output terminal of first detector (12) is connected in series by order, the first input end that first analog to digital converter (17) connects FPGA (19); Second low-pass filter (16) that the output terminal of second detector (14) is connected in series by order, second input end that second analog to digital converter (18) meets FPGA (19), the output termination microprocessor MCU (20) of FPGA (19).
3. the vibration monitoring structure based on optical fiber polarized light time domain reflection sense according to claim 2 is characterized in that being connected with the polarizer (4) between described acousto-optic modulator (3) and the circulator (5).
4. the vibration monitoring method of the vibration monitoring structure based on optical fiber polarized light time domain reflection sense as claimed in claim 1 is characterized in that, comprises step:
Step 1: laser instrument (1) sends the continuous light of power invariability, be divided into two-way by coupling mechanism (2), the coupling mechanism (7) of wherein leading up to divides makes two-way local oscillator light, another road forms pulsed light by the modulation of acousto-optic modulator (3), send into circulator (5) partially by rising of the polarizer (4), survey light and inject sensor fibre (6) by circulator (5)
Step 2: the backscattering light signal that produces in the sensor fibre (6) is sent into coupling mechanism (8) by circulator (5), the output of coupling mechanism (8) is divided into two-way, carry out analyzing through first analyzer (9) and second analyzer (10) respectively, first analyzer (9) and second analyzer (10) analyzer of quadrature each other wherein, its output is done coherent detection with local oscillator light on first detector (12) and second detector (14)
Step 3: result of detection sends into first analog to digital converter (17) by the filtering of first low-pass filter (15) and second low-pass filter (16) and second analog to digital converter (18) is done analog to digital conversion,
Step 4:FPGA (19) carries out pre-service to the data that collect, and improves signal to noise ratio (S/N ratio),
Step 5: microprocessor MCU (20) carries out Fourier transform to pretreated result, obtains the change frequency of signal intensity,
Step 6: dominant frequency frequency and distribution pattern to the frequency spectrum that obtains are analyzed, and obtain the variation characteristic of vibration source.
5. the vibration monitoring method based on optical fiber polarized light time domain reflection sense according to claim 4 is characterized in that described step 2 adopts first analyzer (9) and second analyzer (10) acting in conjunction of orthogonality relation each other, avoids the generation of dead band phenomenon.
6. the vibration monitoring method based on optical fiber polarized light time domain reflection sense according to claim 4, it is characterized in that described step 5, specifically comprise and extract the result of each section in repeatedly measuring in the optical fiber, obtain the back-scattering light time-dependent variation in intensity rule of each section on optical fiber, the intensity data that the analyzer output terminal is risen and fallen carries out spectrum analysis, the frequency spectrum that obtains vibrating.
7. the vibration monitoring method based on optical fiber polarized light time domain reflection sense according to claim 4, it is characterized in that described step 6, wherein the dominant frequency frequency of frequency spectrum is analyzed and specifically comprised optical fiber is carried out real-time on-line monitoring, obtain each section vibration frequency change on the optical fiber; The result and the historical record that measure are each time compared, then illustrate along the vibration source frequency of fiber distribution variation has taken place if measurement result is compared with historical record to have taken place to change.
8. the vibration monitoring method based on optical fiber polarized light time domain reflection sense according to claim 4, it is characterized in that described step 6, wherein the distribution pattern of frequency spectrum is analyzed and specifically comprised optical fiber is carried out real-time on-line monitoring, obtain each section vibration frequency distribution pattern on the optical fiber, it mainly is the variation that energy distributes on fundamental frequency and each harmonic, the result and the historical record that measure are each time compared, if measurement result is compared with historical record to change and illustrated that then the oscillation intensity along fiber distribution changes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910034226A CN101639379A (en) | 2009-08-26 | 2009-08-26 | Vibration monitoring structure and method based on optical fiber polarized light time domain reflection sense |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910034226A CN101639379A (en) | 2009-08-26 | 2009-08-26 | Vibration monitoring structure and method based on optical fiber polarized light time domain reflection sense |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101639379A true CN101639379A (en) | 2010-02-03 |
Family
ID=41614471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910034226A Pending CN101639379A (en) | 2009-08-26 | 2009-08-26 | Vibration monitoring structure and method based on optical fiber polarized light time domain reflection sense |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101639379A (en) |
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813497A (en) * | 2010-04-22 | 2010-08-25 | 南京大学 | Brillouin scattering spectrum real-time spectrum analyzing device and data processing method thereof |
| CN102168953A (en) * | 2011-01-12 | 2011-08-31 | 南京大学 | Full-distributed optical fiber strain and vibration sensor based on coherent heterodyne detection |
| CN102538945A (en) * | 2012-03-07 | 2012-07-04 | 杭州安远科技有限公司 | Cross-polarization control-based distributed vibration sensing system and method |
| WO2013023425A1 (en) * | 2011-08-18 | 2013-02-21 | 天津大学 | Polarization sensitive distributed optical frequency domain reflection turbulence sensing device and demodulation method |
| CN103411660A (en) * | 2013-08-29 | 2013-11-27 | 山东省科学院激光研究所 | Optical fiber distributed type sound wave monitor system |
| CN104296783A (en) * | 2014-10-23 | 2015-01-21 | 武汉理工光科股份有限公司 | Sensor detecting method and device for enhanced coherent optical time domain reflection |
| CN104596634A (en) * | 2014-12-30 | 2015-05-06 | 华中科技大学 | Vibration frequency measurement method |
| CN104748836A (en) * | 2015-03-24 | 2015-07-01 | 华中科技大学 | Fiber vibration sensing system |
| CN104833378A (en) * | 2015-03-06 | 2015-08-12 | 苏州光格设备有限公司 | Method for identifying interference signal of optical fiber perimeter system |
| CN105024750A (en) * | 2015-07-23 | 2015-11-04 | 常州市开拓科联通信设备有限公司 | Multifunctional OTDR testing instrument special for FTTH |
| CN105372673A (en) * | 2015-12-25 | 2016-03-02 | 西安电子科技大学 | Receiving and transmitting integrated inverse SAL (synthetic aperture ladar) system based on acousto-optic frequency shifter |
| CN106767961A (en) * | 2016-12-20 | 2017-05-31 | 南京大学 | A kind of method and device for eliminating polarized light time domain reflection instrument signal fadeout |
| CN106872016A (en) * | 2017-03-15 | 2017-06-20 | 昆山金鸣光电科技有限公司 | A kind of dual-polarization state analyzer for vibrating sensing |
| CN106932083A (en) * | 2017-03-19 | 2017-07-07 | 国网福建省电力有限公司 | A kind of optical-fiber wireless vibrating sensor device based on high-intensity magnetic field background |
| CN107196731A (en) * | 2017-05-22 | 2017-09-22 | 昆山金鸣光电科技有限公司 | A kind of optical fiber multiplexing system for POTDR distributing optical fiber sensings |
| CN107328462A (en) * | 2017-07-04 | 2017-11-07 | 昆山金鸣光电科技有限公司 | A kind of dual-polarization state optical fiber vibration sensing tim e- domain detection system |
| CN107356319A (en) * | 2017-07-04 | 2017-11-17 | 昆山金鸣光电科技有限公司 | A kind of dual-polarization state optical fiber vibration sensing Time-Domain Detection Method |
| CN107402029A (en) * | 2017-08-08 | 2017-11-28 | 电子科技大学 | The method and system of distributing optical fiber sensing measuring speed are improved using orthogonal signalling |
| CN107990970A (en) * | 2017-11-03 | 2018-05-04 | 上海交通大学 | The method for eliminating the noise that declines in distribution type fiber-optic acoustic systems |
| FR3059776A1 (en) * | 2016-12-02 | 2018-06-08 | Laser Institute of Shandong Academy of Science | OPTICAL FIBER DISTRIBUTED SENSOR MONITORING SYSTEM |
| CN109724634A (en) * | 2018-12-29 | 2019-05-07 | 武汉光谷互连科技有限公司 | A kind of the light coherent receiver and method of automatic polarization equilibrium |
| CN112504430A (en) * | 2020-11-26 | 2021-03-16 | 南京大学 | Tower structure health monitoring method based on vibration sensitive optical fiber sensing technology |
| CN112729144A (en) * | 2020-12-18 | 2021-04-30 | 南京大学 | Distributed optical fiber sensing-based multi-path photoelectric composite cable distinguishing method |
| CN112751609A (en) * | 2019-10-29 | 2021-05-04 | 华为技术有限公司 | Optical communication equipment and optical link monitoring device |
| CN112780951A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Method, device and system for detecting storage tank and pipeline invasion event |
| US20220357448A1 (en) * | 2021-05-10 | 2022-11-10 | Subcom, Llc | Spatially resolved perturbation detection using line monitoring system |
-
2009
- 2009-08-26 CN CN200910034226A patent/CN101639379A/en active Pending
Cited By (40)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813497B (en) * | 2010-04-22 | 2011-08-10 | 南京大学 | Brillouin scattering spectrum real-time spectrum analyzing device and data processing method thereof |
| CN101813497A (en) * | 2010-04-22 | 2010-08-25 | 南京大学 | Brillouin scattering spectrum real-time spectrum analyzing device and data processing method thereof |
| CN102168953A (en) * | 2011-01-12 | 2011-08-31 | 南京大学 | Full-distributed optical fiber strain and vibration sensor based on coherent heterodyne detection |
| WO2013023425A1 (en) * | 2011-08-18 | 2013-02-21 | 天津大学 | Polarization sensitive distributed optical frequency domain reflection turbulence sensing device and demodulation method |
| CN102538945B (en) * | 2012-03-07 | 2015-01-28 | 杭州安远科技有限公司 | Cross-polarization control-based distributed vibration sensing system and method |
| CN102538945A (en) * | 2012-03-07 | 2012-07-04 | 杭州安远科技有限公司 | Cross-polarization control-based distributed vibration sensing system and method |
| CN103411660A (en) * | 2013-08-29 | 2013-11-27 | 山东省科学院激光研究所 | Optical fiber distributed type sound wave monitor system |
| CN103411660B (en) * | 2013-08-29 | 2014-12-03 | 山东省科学院激光研究所 | Optical fiber distributed type sound wave monitor system |
| CN104296783A (en) * | 2014-10-23 | 2015-01-21 | 武汉理工光科股份有限公司 | Sensor detecting method and device for enhanced coherent optical time domain reflection |
| CN104596634A (en) * | 2014-12-30 | 2015-05-06 | 华中科技大学 | Vibration frequency measurement method |
| CN104833378B (en) * | 2015-03-06 | 2017-05-17 | 苏州光格设备有限公司 | Method for identifying interference signal of optical fiber perimeter system |
| CN104833378A (en) * | 2015-03-06 | 2015-08-12 | 苏州光格设备有限公司 | Method for identifying interference signal of optical fiber perimeter system |
| CN104748836A (en) * | 2015-03-24 | 2015-07-01 | 华中科技大学 | Fiber vibration sensing system |
| CN105024750A (en) * | 2015-07-23 | 2015-11-04 | 常州市开拓科联通信设备有限公司 | Multifunctional OTDR testing instrument special for FTTH |
| CN105372673A (en) * | 2015-12-25 | 2016-03-02 | 西安电子科技大学 | Receiving and transmitting integrated inverse SAL (synthetic aperture ladar) system based on acousto-optic frequency shifter |
| FR3059776A1 (en) * | 2016-12-02 | 2018-06-08 | Laser Institute of Shandong Academy of Science | OPTICAL FIBER DISTRIBUTED SENSOR MONITORING SYSTEM |
| CN106767961A (en) * | 2016-12-20 | 2017-05-31 | 南京大学 | A kind of method and device for eliminating polarized light time domain reflection instrument signal fadeout |
| CN106767961B (en) * | 2016-12-20 | 2019-01-29 | 南京大学 | A kind of method and device for eliminating Polarization Optical Time Domain Reflectometer signal fadeout |
| CN106872016A (en) * | 2017-03-15 | 2017-06-20 | 昆山金鸣光电科技有限公司 | A kind of dual-polarization state analyzer for vibrating sensing |
| CN106932083B (en) * | 2017-03-19 | 2020-09-04 | 国网福建省电力有限公司 | Optical fiber wireless vibration sensor device based on high-intensity magnetic field background |
| CN106932083A (en) * | 2017-03-19 | 2017-07-07 | 国网福建省电力有限公司 | A kind of optical-fiber wireless vibrating sensor device based on high-intensity magnetic field background |
| CN107196731A (en) * | 2017-05-22 | 2017-09-22 | 昆山金鸣光电科技有限公司 | A kind of optical fiber multiplexing system for POTDR distributing optical fiber sensings |
| CN107328462A (en) * | 2017-07-04 | 2017-11-07 | 昆山金鸣光电科技有限公司 | A kind of dual-polarization state optical fiber vibration sensing tim e- domain detection system |
| CN107356319A (en) * | 2017-07-04 | 2017-11-17 | 昆山金鸣光电科技有限公司 | A kind of dual-polarization state optical fiber vibration sensing Time-Domain Detection Method |
| CN107356319B (en) * | 2017-07-04 | 2019-07-26 | 昆山金鸣光电科技有限公司 | A kind of dual-polarization state optical fiber vibration sensing Time-Domain Detection Method |
| CN107328462B (en) * | 2017-07-04 | 2019-07-26 | 昆山金鸣光电科技有限公司 | A kind of dual-polarization state optical fiber vibration sensing tim e- domain detection system |
| CN107402029A (en) * | 2017-08-08 | 2017-11-28 | 电子科技大学 | The method and system of distributing optical fiber sensing measuring speed are improved using orthogonal signalling |
| CN107402029B (en) * | 2017-08-08 | 2019-08-20 | 电子科技大学 | The method and system of distributing optical fiber sensing measuring speed are improved using orthogonal signalling |
| CN107990970A (en) * | 2017-11-03 | 2018-05-04 | 上海交通大学 | The method for eliminating the noise that declines in distribution type fiber-optic acoustic systems |
| CN107990970B (en) * | 2017-11-03 | 2019-10-15 | 上海交通大学 | The method for eliminating the noise that declines in distribution type fiber-optic acoustic systems |
| CN109724634A (en) * | 2018-12-29 | 2019-05-07 | 武汉光谷互连科技有限公司 | A kind of the light coherent receiver and method of automatic polarization equilibrium |
| CN109724634B (en) * | 2018-12-29 | 2022-01-18 | 武汉光谷互连科技有限公司 | Optical coherent receiving method with automatic polarization equalization |
| CN112751609A (en) * | 2019-10-29 | 2021-05-04 | 华为技术有限公司 | Optical communication equipment and optical link monitoring device |
| CN112751609B (en) * | 2019-10-29 | 2022-08-09 | 华为技术有限公司 | Optical communication equipment and optical link monitoring device |
| CN112780951A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Method, device and system for detecting storage tank and pipeline invasion event |
| CN112504430A (en) * | 2020-11-26 | 2021-03-16 | 南京大学 | Tower structure health monitoring method based on vibration sensitive optical fiber sensing technology |
| CN112504430B (en) * | 2020-11-26 | 2022-03-01 | 南京大学 | Tower structure health monitoring method based on vibration sensitive optical fiber sensing technology |
| CN112729144A (en) * | 2020-12-18 | 2021-04-30 | 南京大学 | Distributed optical fiber sensing-based multi-path photoelectric composite cable distinguishing method |
| US20220357448A1 (en) * | 2021-05-10 | 2022-11-10 | Subcom, Llc | Spatially resolved perturbation detection using line monitoring system |
| US11914040B2 (en) * | 2021-05-10 | 2024-02-27 | Subcom, Llc | Spatially resolved perturbation detection using line monitoring system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101639379A (en) | Vibration monitoring structure and method based on optical fiber polarized light time domain reflection sense | |
| CN102384799B (en) | Frequency sweeping and data processing method based on Brillouin distributed fiber sensing system correlation detection scheme | |
| CN103115632B (en) | Multi-wavelength Brillouin optical time-domain analyzer | |
| CN102937416B (en) | A kind of fully distributed fiber switched based on orthogonal polarisation state strains and vibration sensing method and device | |
| CN102759371B (en) | COTDR (coherent detection based optical time-domain reflectometry) fused long-distance coherent detection brilouin optical time-domain analyzer | |
| CN105509868B (en) | Phase sensitive optical time domain reflection distributed fiber-optic sensor system phase calculation method | |
| CN105806465B (en) | A kind of novel Φ-OTDR detection device and its detection method based on fixation reflex point | |
| CN107917738A (en) | A kind of while measurement temperature, strain and the distributed optical fiber sensing system of vibration | |
| CN107976248A (en) | It can realize the distributed optical fiber sensing system and its measuring method of all phase demodulation | |
| CN1908505B (en) | Alarm sensing system for distributed optical fiber oil and gas pipeline | |
| CN102645268A (en) | Optical frequency division multiplexing phase-sensitive optical time domain reflectometer | |
| CN103245370A (en) | BOTDA (Brillouin Optical Time-Domain Analysis) system based on pulse coding and coherent detection | |
| CN207036249U (en) | A kind of highly sensitive distributed optical fiber vibration sensing system | |
| CN104568119A (en) | Optical fiber vibration sensing system of single light source pulse and sensing method thereof | |
| CA2906964A1 (en) | Brillouin optical distributed sensing device and method with improved tolerance to sensor failure | |
| CN107782438A (en) | Optical fiber raster vibration measuring system based on pulse code and edge filter demodulation method | |
| CN108507663A (en) | Distribution type fiber-optic sound sensing device and method based on dual-polarization double sideband modulation | |
| CN114543973B (en) | Distributed ultrahigh frequency vibration signal measurement method and optical fiber sensor | |
| CN104344945A (en) | Frequency code optical fiber time domain reflectometer and working method thereof | |
| CN103090813A (en) | High resolution sensing system measuring beat-length and strain of polarization maintaining optical fiber based on optical frequency domain reflectometer (OFDR) system | |
| CN103217226A (en) | Passive homodyne demodulation device and passive homodyne demodulation method for fai-OTDR (optical time domain reflectometer) | |
| Yu et al. | Distributed optical fiber vibration sensing using phase-generated carrier demodulation algorithm | |
| CN103674082B (en) | A kind of High-spatial-resolutoptical optical frequency domain reflectometer system based on four-wave mixing process | |
| CN103940501A (en) | BOTDA distributed vibration sensing system based on dynamic phase demodulating | |
| CN203642943U (en) | High spatial resolution light frequency domain reflectometer system based on four-wave mixing process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100203 |