CN107270952A - Based on the distributed destabilization sensing signal processing method of probe beam deflation long-distance optical fiber - Google Patents
Based on the distributed destabilization sensing signal processing method of probe beam deflation long-distance optical fiber Download PDFInfo
- Publication number
- CN107270952A CN107270952A CN201710624875.2A CN201710624875A CN107270952A CN 107270952 A CN107270952 A CN 107270952A CN 201710624875 A CN201710624875 A CN 201710624875A CN 107270952 A CN107270952 A CN 107270952A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- processing method
- probe beam
- disturbance
- distributed
- 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.)
- Granted
Links
- 239000000523 sample Substances 0.000 title claims abstract description 22
- 239000013307 optical fiber Substances 0.000 title claims abstract description 20
- 230000001687 destabilization Effects 0.000 title claims abstract description 17
- 238000003672 processing method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 19
- 230000009467 reduction Effects 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims abstract description 3
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 3
- 230000035559 beat frequency Effects 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 3
- 238000011946 reduction process Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 239000000835 fiber Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 230000002463 transducing effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Instruments For Measurement Of Length By Optical Means (AREA)
Abstract
The invention provides one kind based on the distributed destabilization sensing signal processing method of probe beam deflation long-distance optical fiber, S1, using image processing method carries out noise reduction reinforcing characteristic processing to measurement signal；S2, using the noise-reduction method without loss of spatial resolution, and utilizing LPF noise reduction, in the case where ensure that spatial resolution, making the more obvious protrusion in disturbance location, so as to differentiate multipoint disturbance.It is of the present invention effectively to reduce noise using image processing method based on the distributed destabilization sensing signal processing method of probe beam deflation long-distance optical fiber and retain perturbation features information.When differentiating multipoint disturbance, the noise-reduction method of no loss of spatial resolution, using LPF noise reduction, in the case where ensure that spatial resolution, makes the more obvious protrusion in disturbance location.
Description
Technical field
The invention belongs to fiber optic sensor technology field, more particularly, to one kind based on probe beam deflation long-distance optical fiber point
Cloth destabilization sensing signal processing method.
Background technology
The distributed destabilization sensing of long range is widely used in the multiple fields such as the people's livelihood, national defense safety, such as aircraft, boat
The structural health monitoring of the keypoint parts such as its device, ship, defence equipment, industrial equipment, bridge culvert, using in probe beam deflation
The distributed destabilization sensing of the long range of high-precision high spatial resolution can be achieved in the movement of single-mode fiber Rayleigh Scattering Spectra.
And in the existing optical fiber disturbance sensing based on probe beam deflation, there is multipoint disturbance position mostly cannot be distinguished by, pass
The problems such as feeling larger signal noise and not high spatial resolution.
The content of the invention
In view of this, the present invention is directed to propose a kind of based on the distributed destabilization sensing signal of probe beam deflation long-distance optical fiber
Processing method, to overcome in the existing optical fiber disturbance sensing based on probe beam deflation, there is multipoint disturbance position mostly can not area
Point, transducing signal noise is larger and the problems such as not high spatial resolution.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
One kind based on the distributed destabilization sensing signal processing method of probe beam deflation long-distance optical fiber, S1, using image at
Reason method, noise reduction reinforcing characteristic processing is carried out to measurement signal；
S2, using the noise-reduction method without loss of spatial resolution, and utilize LPF noise reduction, ensure that spatial discrimination
In the case of rate, make the more obvious protrusion in disturbance location, so as to differentiate multipoint disturbance.
Further, the execution method of the step S1, specific as follows：
S101, in the main interferometer of probe beam deflation instrument beat frequency interference signal formed by optical fiber back rayleigh scattering；
S102, to this beat frequency interference signal along time shaft cutting, Fast Fourier Transform (FFT) is carried out respectively；
S103, with Time-Frequency Analysis Method, by signal using time, distance be axle group as image；
S104, to imagery exploitation local mean value filtering method carry out noise reduction process, to time-domain information corresponding to each position
Average is taken, is synthesized all the way apart from domain information.
Further, the method for differentiating multipoint disturbance, specific as follows：
Domain signal of adjusting the distance carries out Fourier transform, by high-frequency information zero setting, and another mistake switches back to distance domain, obtains low pass drop
Make an uproar effect, the depression trough after searching processing in back rayleigh scattering distance domain signal, the depression wave trough position is second point
Disturbance location, method described above distinguishes multipoint disturbance.
It is of the present invention based on the distributed destabilization sensing signal of probe beam deflation long-distance optical fiber relative to prior art
Processing method has the advantage that：
It is of the present invention that figure is utilized based on the distributed destabilization sensing signal processing method of probe beam deflation long-distance optical fiber
As processing method effectively reduces noise and retains perturbation features information.When differentiating multipoint disturbance, the drop of no loss of spatial resolution
Method for de-noising, using LPF noise reduction, in the case where ensure that spatial resolution, makes the more obvious protrusion in disturbance location.
Brief description of the drawings
The accompanying drawing for constituting the part of the present invention is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is based on the distributed destabilization sensing signal transacting of probe beam deflation long-distance optical fiber described in the embodiment of the present invention
Method flow schematic diagram；
Fig. 2 is the used analysis image of time frequency analysis；
Fig. 3 is the result figure after denoising.
Embodiment
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combination.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " on ", " under ",
The orientation or position relationship of the instruction such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " are
Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than indicate or dark
Specific orientation must be had, with specific azimuth configuration and operation by showing the device or element of meaning, therefore it is not intended that right
The limitation of the present invention.In addition, term " first ", " second " etc. are only used for describing purpose, and it is not intended that indicating or implying phase
To importance or the implicit quantity for indicating indicated technical characteristic.Thus, the feature for defining " first ", " second " etc. can
To express or implicitly include one or more this feature.In the description of the invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
As shown in figure 1, based on the distributed destabilization sensing signal processing method of probe beam deflation long-distance optical fiber, specific steps
It is as follows：
(1) beat frequency interference signal is formed by optical fiber back rayleigh scattering in the main interferometer of probe beam deflation instrument, and it is right
This beat frequency interference signal carries out Fast Fourier Transform (FFT) respectively along time shaft cutting, with Time-Frequency Analysis Method, by signal with when
Between, distance be that axle group is image；
(2) noise reduction process is carried out to imagery exploitation local mean value filtering method, time-domain information corresponding to each position is taken
Average, is synthesized all the way apart from domain information；
(3) multipoint disturbance is directed to, domain signal of adjusting the distance carries out Fourier transform, and by high-frequency information zero setting, another mistake switches back to
Distance domain, obtains low pass noise reduction.Depression trough after searching processing in back rayleigh scattering distance domain signal, the depression ripple
Paddy position is second point disturbance location, and method described above distinguishes multipoint disturbance.
The system of use is included：It is GPIB control modules, computer, main interferometer, Additional interference instrument, harvester, adjustable
Humorous light source.Wherein main interferometer is the core of probe beam deflation instrument, and it is modified Mach Zehnder interferometer.
System Working Principle：
When device works, computer controls tunable laser to control tuned speed, middle cardiac wave by GPIB control modules
Long, tuning startup etc.；The emergent light of tunable laser by probe beam deflation instrument sensor fibre disturbance information and output signal light,
And received by harvester, harvester transmits the analog electrical signal collected to computer.
The principle of destabilization sensing is, it is assumed that a certain position in testing fiber has a disturbance event, and its vibration can draw
Play the change of test light field E phase place change and loss reflectivity R in test arm.Phase place change caused by vibration can be represented
For：
Δ φ=δ sin (2 π f_m t)
Wherein, f_m is vibration frequency, and δ is the modulation amplitude of phase.And reflectivity is lost and decays because of vibration, cause
Distance domain signal amplitude declines.The new calculation that multipoint disturbance is measured for long-distance optical fiber distributed sensing proposed by the invention
Method, i.e., carry out disturbance location detection using above-mentioned principle features.
Principle for disturbing signal time frequency analysis image procossing is, to beat frequency interference signal along time shaft cutting, distinguishes
Fast Fourier Transform (FFT) is carried out, and then forms time, the 2D signal of frequency bivariate, is carried out this 2D signal as image
Processing.The method filtered using local mean value, effectively reduces transducing signal noise, and retain perturbation features information.
As shown in Fig. 2 the two dimensional image for being respectively time and distance for transverse and longitudinal coordinate, upper figure is that figure below makees local mean value filter
Image after the processing of ripple, it is seen that noise is substantially suppressed.As shown in figure 3, to be reduced after processing apart from area image.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (3)
1. based on the distributed destabilization sensing signal processing method of probe beam deflation long-distance optical fiber, it is characterised in that including following
Step：
S1, using image processing method, noise reduction reinforcing characteristic processing is carried out to measurement signal；
S2, using the noise-reduction method without loss of spatial resolution, and utilize LPF noise reduction, ensure that spatial resolution
In the case of, make the more obvious protrusion in disturbance location, so as to differentiate multipoint disturbance.
2. it is according to claim 1 based on the distributed destabilization sensing signal processing method of probe beam deflation long-distance optical fiber,
Characterized in that, the execution method of the step S1, specific as follows：
S101, in the main interferometer of probe beam deflation instrument beat frequency interference signal formed by optical fiber back rayleigh scattering；
S102, to this beat frequency interference signal along time shaft cutting, Fast Fourier Transform (FFT) is carried out respectively；
S103, with Time-Frequency Analysis Method, by signal using time, distance be axle group as image；
S104, to imagery exploitation local mean value filtering method carry out noise reduction process, time-domain information corresponding to each position is taken
Value, is synthesized all the way apart from domain information.
3. it is according to claim 1 based on the distributed destabilization sensing signal processing method of probe beam deflation long-distance optical fiber,
Characterized in that, the method for differentiating multipoint disturbance, specific as follows：
Domain signal of adjusting the distance carries out Fourier transform, by high-frequency information zero setting, and another mistake switches back to distance domain, obtains low pass noise reduction effect
Really, the depression trough after searching processing in back rayleigh scattering distance domain signal, the depression wave trough position is second point disturbance
Position, method described above distinguishes multipoint disturbance.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710624875.2A CN107270952B (en) | 2017-07-27 | 2017-07-27 | Long-distance optical fiber distributed disturbance sensing signal processing method based on optical frequency domain reflection |
| PCT/CN2018/084568 WO2019019735A1 (en) | 2017-07-27 | 2018-04-26 | Method for processing long-distance optical fiber distributed disturbance sensing signal based on optical frequency domain reflection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710624875.2A CN107270952B (en) | 2017-07-27 | 2017-07-27 | Long-distance optical fiber distributed disturbance sensing signal processing method based on optical frequency domain reflection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107270952A true CN107270952A (en) | 2017-10-20 |
| CN107270952B CN107270952B (en) | 2020-03-31 |
Family
ID=60079295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710624875.2A Active CN107270952B (en) | 2017-07-27 | 2017-07-27 | Long-distance optical fiber distributed disturbance sensing signal processing method based on optical frequency domain reflection |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107270952B (en) |
| WO (1) | WO2019019735A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019019735A1 (en) * | 2017-07-27 | 2019-01-31 | 天津求实飞博科技有限公司 | Method for processing long-distance optical fiber distributed disturbance sensing signal based on optical frequency domain reflection |
| CN110160569A (en) * | 2019-04-24 | 2019-08-23 | 国网浙江省电力有限公司信息通信分公司 | For the noise-reduction method of distributing optical fiber sensing signal, system and storage medium |
| CN111579048A (en) * | 2020-05-12 | 2020-08-25 | 山东大学 | OFDR system vibration detection method based on sliding time gating |
| CN112639523A (en) * | 2020-06-30 | 2021-04-09 | 华为技术有限公司 | Radar detection method and related device |
| CN113188461A (en) * | 2021-05-06 | 2021-07-30 | 山东大学 | OFDR large strain measurement method under high spatial resolution |
| CN113237431A (en) * | 2021-05-06 | 2021-08-10 | 山东大学 | Measurement method for improving distributed spatial resolution of OFDR system |
| CN116380140A (en) * | 2023-06-07 | 2023-07-04 | 山东省科学院激光研究所 | Distributed acoustic wave sensing system based on mean value filtering technology and measuring method thereof |
| CN116399379A (en) * | 2023-06-07 | 2023-07-07 | 山东省科学院激光研究所 | Distributed optical fiber acoustic wave sensing system and measuring method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003029851A2 (en) * | 2001-09-28 | 2003-04-10 | University Of Southampton | Optical fibre-based devices utilising the raman effect |
| CN102589587A (en) * | 2012-02-13 | 2012-07-18 | 上海大学 | Improved short-term cross-correlation positioning method for chaos fiber fence system |
| US20140362367A1 (en) * | 2013-06-10 | 2014-12-11 | General Photonics Corporation | Distributed fiber bend and stress measurement for determining optical fiber reliability by multi-wavelength optical reflectometry |
| CN104215271A (en) * | 2014-07-30 | 2014-12-17 | 复旦大学 | Positioning method for disturbance position in distributed optical fiber disturbance monitoring system |
| CN106872071A (en) * | 2016-12-30 | 2017-06-20 | 江苏骏龙光电科技股份有限公司 | A kind of temp measuring method based on optical frequency domain reflection technology |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4976507A (en) * | 1988-06-20 | 1990-12-11 | Mcdonnell Douglas Corporation | Sagnac distributed sensor |
| CN102322880B (en) * | 2011-08-18 | 2013-06-05 | 天津大学 | Polarization sensitive distributive optical frequency domain reflection disturbance sensor and demodulation method |
| CN102401667B (en) * | 2011-09-29 | 2016-03-30 | 北京航空航天大学 | There is optical fiber distributed perturbation method for sensing and the system of disturbance character recognition function |
| CN102506913B (en) * | 2011-10-28 | 2015-04-08 | 北京航空航天大学 | Interference type optical fiber distribution disturbance sensor and disturbance location method thereof |
| CN103090961B (en) * | 2013-02-01 | 2014-11-26 | 华中科技大学 | Disturbance source positioning method of distributed type optical fiber sensing system |
| CN104240455B (en) * | 2014-08-07 | 2016-08-17 | 北京航天控制仪器研究所 | A kind of disturbance event recognition methods in distribution type fiber-optic pipeline safety early warning system |
| CN104729667B (en) * | 2015-03-25 | 2017-11-07 | 北京航天控制仪器研究所 | A kind of disturbance kind identification method in distributed optical fiber vibration sensing system |
| CN105277272A (en) * | 2015-10-25 | 2016-01-27 | 复旦大学 | Distributed optical fiber vibration sensing multi-point disturbance localization algorithm |
| CN105488935B (en) * | 2015-12-25 | 2018-01-16 | 天津大学 | A kind of distributed optical fiber disturbance positioning system and its localization method based on asymmetric double Mach Zehnder interference |
| CN106441386B (en) * | 2016-09-29 | 2019-02-26 | 西南交通大学 | Data processing method and device based on distributed optical fiber sensing system |
| CN107270952B (en) * | 2017-07-27 | 2020-03-31 | 天津求实飞博科技有限公司 | Long-distance optical fiber distributed disturbance sensing signal processing method based on optical frequency domain reflection |
-
2017
- 2017-07-27 CN CN201710624875.2A patent/CN107270952B/en active Active
-
2018
- 2018-04-26 WO PCT/CN2018/084568 patent/WO2019019735A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003029851A2 (en) * | 2001-09-28 | 2003-04-10 | University Of Southampton | Optical fibre-based devices utilising the raman effect |
| CN102589587A (en) * | 2012-02-13 | 2012-07-18 | 上海大学 | Improved short-term cross-correlation positioning method for chaos fiber fence system |
| US20140362367A1 (en) * | 2013-06-10 | 2014-12-11 | General Photonics Corporation | Distributed fiber bend and stress measurement for determining optical fiber reliability by multi-wavelength optical reflectometry |
| CN104215271A (en) * | 2014-07-30 | 2014-12-17 | 复旦大学 | Positioning method for disturbance position in distributed optical fiber disturbance monitoring system |
| CN106872071A (en) * | 2016-12-30 | 2017-06-20 | 江苏骏龙光电科技股份有限公司 | A kind of temp measuring method based on optical frequency domain reflection technology |
Non-Patent Citations (1)
| Title |
|---|
| TIEGEN LIU等: "40-km OFDR-Based Distributed Disturbance Optical Fiber Sensor", 《IEEE PHOTONICS TECHNOLOGY LETTERS》 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019019735A1 (en) * | 2017-07-27 | 2019-01-31 | 天津求实飞博科技有限公司 | Method for processing long-distance optical fiber distributed disturbance sensing signal based on optical frequency domain reflection |
| CN110160569B (en) * | 2019-04-24 | 2021-09-24 | 国网浙江省电力有限公司信息通信分公司 | Noise reduction method and system for distributed optical fiber sensing signal and storage medium |
| CN110160569A (en) * | 2019-04-24 | 2019-08-23 | 国网浙江省电力有限公司信息通信分公司 | For the noise-reduction method of distributing optical fiber sensing signal, system and storage medium |
| CN111579048A (en) * | 2020-05-12 | 2020-08-25 | 山东大学 | OFDR system vibration detection method based on sliding time gating |
| CN112639523A (en) * | 2020-06-30 | 2021-04-09 | 华为技术有限公司 | Radar detection method and related device |
| CN112639523B (en) * | 2020-06-30 | 2022-04-29 | 华为技术有限公司 | Radar detection method and related device |
| CN113237431A (en) * | 2021-05-06 | 2021-08-10 | 山东大学 | Measurement method for improving distributed spatial resolution of OFDR system |
| CN113188461A (en) * | 2021-05-06 | 2021-07-30 | 山东大学 | OFDR large strain measurement method under high spatial resolution |
| CN113237431B (en) * | 2021-05-06 | 2022-03-18 | 山东大学 | Measurement method for improving distributed spatial resolution of OFDR system |
| CN113188461B (en) * | 2021-05-06 | 2022-05-17 | 山东大学 | OFDR large strain measurement method under high spatial resolution |
| CN116380140A (en) * | 2023-06-07 | 2023-07-04 | 山东省科学院激光研究所 | Distributed acoustic wave sensing system based on mean value filtering technology and measuring method thereof |
| CN116399379A (en) * | 2023-06-07 | 2023-07-07 | 山东省科学院激光研究所 | Distributed optical fiber acoustic wave sensing system and measuring method thereof |
| CN116399379B (en) * | 2023-06-07 | 2023-11-03 | 山东省科学院激光研究所 | Distributed optical fiber acoustic wave sensing system and measuring method thereof |
| CN116380140B (en) * | 2023-06-07 | 2023-11-03 | 山东省科学院激光研究所 | Distributed acoustic wave sensing system based on mean value filtering technology and measuring method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107270952B (en) | 2020-03-31 |
| WO2019019735A1 (en) | 2019-01-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107270952A (en) | Based on the distributed destabilization sensing signal processing method of probe beam deflation long-distance optical fiber | |
| US8621931B2 (en) | Multipoint laser vibrometer with single detector | |
| CN101303788B (en) | Perimeter alarming method and system for implementing orientation of composite type complete optical fiber | |
| CN103900623B (en) | Optical time domain reflectometer and its common mode inhibition method based on alliteration optical modulator | |
| CN110487313A (en) | Light source frequency sweep Nonlinear Self-tuning method in optical frequency domain reflection technology | |
| CN105466349B (en) | In a kind of probe beam deflation strain measurement sensitivity method is improved with thin cladded-fiber | |
| CN111006753B (en) | Phase feedback controlled optical fiber interference ultralow frequency vibration measuring device and method | |
| CN104006948B (en) | Based on the method that multimodal division cycle demodulates polarization maintaining optical fibre polarization coupled point position | |
| CN104215271B (en) | Positioning method for disturbance position in distributed optical fiber disturbance monitoring system | |
| CN106840222A (en) | A kind of distributed optical fiber sensing system and its suppressing method of suppression common mode noise | |
| US20200141769A1 (en) | Method for processing long-distance optical fiber distributed disturbance sensing signal based on optical frequency domain reflectometry | |
| CN101893562A (en) | High-sensitivity integrated optical waveguide sensor based on digital droplet sample introduction channel | |
| CN104567959A (en) | Large-dynamic interference type optical fiber sensor based on two-channel unbalanced interferometer | |
| Huang et al. | Configurable filter-based endpoint detection in DMZI vibration system | |
| CN107014409B (en) | A kind of long range optical frequency domain reflection-based optical fiber Distributed Multi destabilization sensing method | |
| CN114184988A (en) | Aeromagnetic compensation method and device containing compensation platform current magnetic interference | |
| CN104006950B (en) | A kind of polarization maintaining optical fibre birefringence dispersion measuring method | |
| CN110186500A (en) | A kind of non-equilibrium fibre optic interferometer arm length difference measuring device and measuring method using absolute method | |
| Udd et al. | Single-mode fiber-optic vibration sensor | |
| EP2856082B1 (en) | Synoptic fiber optic sensor | |
| CN106839972B (en) | A kind of interference signal processing method of full light fiber white light interference instrument | |
| CN110146116A (en) | The localization method of Sagnac Fibre Optical Sensor under a kind of multipoint disturbance | |
| JPH0249109A (en) | Vehicle azimuth detector | |
| CN104062031B (en) | Based on MZI sensing and the distance of Brillouin sensing cooperation, high spatial resolution method for sensing | |
| Zhao et al. | Compensation of fiber optic gyroscope vibration error based on VMD and FPA-WT |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |