CN106972886A - Fiber-optic vibration detecting small echo signal audio reduction technique based on backward Rayleigh scattering phase of echo angle change - Google Patents
Fiber-optic vibration detecting small echo signal audio reduction technique based on backward Rayleigh scattering phase of echo angle change Download PDFInfo
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- CN106972886A CN106972886A CN201710196221.4A CN201710196221A CN106972886A CN 106972886 A CN106972886 A CN 106972886A CN 201710196221 A CN201710196221 A CN 201710196221A CN 106972886 A CN106972886 A CN 106972886A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 2
- 238000001069 Raman spectroscopy Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 claims 1
- 238000000605 extraction Methods 0.000 claims 1
- 230000011664 signaling Effects 0.000 claims 1
- 230000005236 sound signal Effects 0.000 claims 1
- 239000013307 optical fiber Substances 0.000 abstract description 12
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract 2
- 230000010355 oscillation Effects 0.000 abstract 2
- 230000005693 optoelectronics Effects 0.000 abstract 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2537—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to scattering processes, e.g. Raman or Brillouin scattering
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Quality & Reliability (AREA)
- Computational Linguistics (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
Small echo signal audio reduction technique is detected the invention discloses a kind of fiber-optic vibration based on backward Rayleigh scattering phase of echo angle change.The system mainly includes：Optical fiber, light-pulse generator, beam splitter, signal-processing board and host computer Digital Signal Processing and voice restoration system as transmission medium.The principle of the system is：Pulsed light is squeezed into optical fiber, vibration position is determined according to the time of the backward Rayleigh scattering received, host computer can select to monitor some position；In the case where oscillation point oscillation intensity is extremely faint, according to detecting the phase minor variations of backward Rayleigh scattering light as vibration detecting source, by opto-electronic conversion, the conversion of electric signal to data signal, one within a period of time group of some point is finally given with the phase angle disturbed value of hexadecimal representation, these vibration values are carried out after simple regression processing, scatterplot line is finally drawn into envelope and carries out digital reduction, obtained array can play out the voice content that somewhere is listened to as the data parts of wav files by player.
Description
Technical field
The present invention relates to a kind of in the case where extremely faint vibration signal is disturbed to optical fiber, realize that audio is reduced
Optical fiber interception technology, it is adaptable in the case of comparatively quietly, fiber-optic vibration is carried out to extremely faint audio-frequency information
The system for detecting audio reduction.The technology and principle mainly used have：Sound wave causes fiber-optic vibration, the inspection of Rayleigh scattering backward echo
Survey, phase of echo detection, phase differential transition detection method etc..Belong to optical fiber vibration sensing, photoelectric signal transformation, modulus signal to turn
The technical field such as change, monitor.
Background technology
Optical fiber interception technology based on Rayleigh scattering principle is belonging to a brand-new field both at home and abroad at present, when extremely micro-
Weak sound, by air borne to optical fiber, causing optical fiber extremely faint deformation, so as to produce backward Rayleigh scattering signal
The disturbance of intensity and phase.By the change for detecting the disturbing signal, it is possible to achieve audio is reduced.
When the sound for producing optical fiber disturbance is extremely faint or due to cable armor causes optical-fiber deformation excessively faint when
Wait, because signal to noise ratio is too low, signal is easy to be flooded by ambient noise.Cause audio reduce after effect it is poor, it is impossible to distinguish
Acoustic information.The good reduction of extremely weak vibration information can not be realized using backward Rayleigh intensity detection method.
The content of the invention
The present invention relates to content, mainly solve in extremely faint audio frequency vibration information transmission to optical fiber, drawn
The backward Rayleigh scattering backward energy signal to noise ratio risen is too low, is reduced so that good parsing can not be carried out to vibration source audio frequency characteristics.
In order to solve the above problems, using differential phase detection method, after simple regression is handled, letter can greatly improve
Make an uproar and compare, realize good reduction focused energy feature, parse audio-frequency information.
Wherein, differential phase detection method is to be delivered on optical fiber to cause fiber-optic vibration shape using extremely faint vibration signal
Become excessively small, so as to cause backward Rayleigh scattering, energy amplitude change is too small, on the premise of signal to noise ratio is too low, and backward auspicious
The phase perturbation of profit scattering is than larger, according to the principle, it is only necessary to which phase perturbation is detected, you can preferably reduction vibration
Feature, so as to realize the technology of audio reduction.
Because backward Rayleigh scattering echo is in a certain position of two vector angles of XY, if static backward Rayleigh scattering is returned
Wave number is √, when small echo vibration causes multiple √ in a period of timeDraw value after cumulative, less than n（√）In the case of wherein n ＞ 1, i.e., using phase-detection method.
If α is backward Rayleigh echo and the static angle of Y-axis, then α span is 0- α-pi/2, due to small wave disturbance
The positive or negative small bounces of α are likely to result in, if a certain transient state angle is αn, α is limited by polariscopenSpan still can
Between 0- △ α-pi/2, then α-αn=△α.The △ α are the phase pushing figure caused by small wave disturbance
By the △ α detected every time according to rectangular coordinate system transverse axis be the time, the longitudinal axis be 0- pi/2 setting-outs, you can a small echo
Disturb phase curve.The curve is changed using 16 systems scatterplot line is finally drawn into the digital reduction of envelope progress, obtained
Array as the data parts of wav files, the voice content that somewhere is listened to can be played out by player.Due to measurement
Value αnIt is known determination number, and now original static phase angle α is unknown data, using simple regression method to static phase angle
α is calculated the approximation α ξ of the now variable.
If √=b
Then α ξ=b1+b2 α¡+μ¡
Wherein α ξ are dependent variable
α¡For independent variable
Repeatedly √ is measured when b1, b2 is static stateThe parameter of numerical value.
μ¡For Disturbance
How to determine that b1, b2 value cause residual sum of squares (RSS) Σ e according to calculus¡2 is minimum.
I.e.：
Q=Σе¡²=Σ（Y¡-Ŷ¡）²=Σ（Y¡-b1-b2X¡）²=min
As Q=Σ（Y¡-b1-b2X¡）When 2 couples of b1, b2 inclined order derivative of single order are 0, Q reaches minimum value.
B1, b2 is solved to obtain
Note：Wherein xi=（Xi-）、yi=（Yi-）I.e. lowercase represents the deviation of variable and its average.
Bring b1, b2 into formula α ξ=b1+b2 αi+μi
Try to achieve
Scanning draws Δ α every time, in transverse axis is that time, the longitudinal axis are 0- pi/2s by Δ α, sets up two-dimensional coordinate system.It can show that small echo is disturbed
The dynamic phase perturbation scatterplot to backward Rayleigh scattering echo.Scatterplot line draws envelope and carries out digital reduction, obtained array
As the data parts of wav files, the audio content listened at this can be played out by player.
Claims (4)
1. the fiber-optic vibration detecting small echo signal audio also original system based on backward Rayleigh scattering phase of echo angle change, it is special
Levy including：Laser generator, impulse controller, circulator, raman amplifier, optical-electrical converter, logical-arithmetic unit, data signal
The parts such as processor, host computer are constituted.
2. the method according to right 1, the fiber-optic vibration detecting small echo based on backward Rayleigh scattering phase of echo angle change
The application of signal audio reduction technique, it is characterised in that including：
When the vibration signal for being detected position is excessively faint, in order to remain able to preferably detect vibration information, using Rayleigh
The reduction mode of scatter echo phase angle change, audio reduction is carried out by the vibration wave feature of vibration source, so as to form atomic weak shake
The extraction of dynamic feature.
3. according to right 1, right 2, described method, it is characterised in that：Rayleigh beacon echo is completely orthogonal by two-way
Polarizer（Circulator）After detection, become X, Y two-way quadrature component；After two optical-electrical converters of X, Y, rear class is sent into
Analog-digital converter is digitized processing（Omit the schematic diagram part）, then give DSP unit progress signal transacting.
4. the method according to right 3, it is characterised in that：DSP unit detects X, Y two-way orthogonal signalling, further according to this two
Vector intensity information calculates the intensity information of this point, after calculation process, still very faint and can not realize signal distinguishing
In the case of, using phase differential transition detection method, then after simple regression is handled, by extremely faint vibration signal also
Originally it was audio signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710196221.4A CN106972886A (en) | 2017-03-29 | 2017-03-29 | Fiber-optic vibration detecting small echo signal audio reduction technique based on backward Rayleigh scattering phase of echo angle change |
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| CN201710196221.4A CN106972886A (en) | 2017-03-29 | 2017-03-29 | Fiber-optic vibration detecting small echo signal audio reduction technique based on backward Rayleigh scattering phase of echo angle change |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404540A (en) * | 2021-06-11 | 2021-09-17 | 安徽中科昊音智能科技有限公司 | Voiceprint comprehensive monitoring system applied to coal mine scene |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674080A (en) * | 2013-12-18 | 2014-03-26 | 复旦大学 | Optical fiber interference method and system aimed at weak signal detection |
| US20140255023A1 (en) * | 2011-10-05 | 2014-09-11 | Neubrex Co., Ltd. | Distributed optical fiber sound wave detection device |
| 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 |
| CN106500742A (en) * | 2016-12-30 | 2017-03-15 | 中国电子科技集团公司第三十四研究所 | A kind of phase sensitive optical time domain reflectometer phase demodulating system and phase demodulating method |
| CN106500823A (en) * | 2016-12-05 | 2017-03-15 | 华南理工大学 | Based on the device that thin footpath multimode fibre realizes the distributed sound wave sensing of high sensitivity |
-
2017
- 2017-03-29 CN CN201710196221.4A patent/CN106972886A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140255023A1 (en) * | 2011-10-05 | 2014-09-11 | Neubrex Co., Ltd. | Distributed optical fiber sound wave detection device |
| CN103674080A (en) * | 2013-12-18 | 2014-03-26 | 复旦大学 | Optical fiber interference method and system aimed at weak signal detection |
| 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 |
| CN106500823A (en) * | 2016-12-05 | 2017-03-15 | 华南理工大学 | Based on the device that thin footpath multimode fibre realizes the distributed sound wave sensing of high sensitivity |
| CN106500742A (en) * | 2016-12-30 | 2017-03-15 | 中国电子科技集团公司第三十四研究所 | A kind of phase sensitive optical time domain reflectometer phase demodulating system and phase demodulating method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404540A (en) * | 2021-06-11 | 2021-09-17 | 安徽中科昊音智能科技有限公司 | Voiceprint comprehensive monitoring system applied to coal mine scene |
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Application publication date: 20170721 |