CN107144339A - A kind of distributed optical fiber sensing system based on modulation pulse technique - Google Patents
A kind of distributed optical fiber sensing system based on modulation pulse technique Download PDFInfo
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- CN107144339A CN107144339A CN201710347060.4A CN201710347060A CN107144339A CN 107144339 A CN107144339 A CN 107144339A CN 201710347060 A CN201710347060 A CN 201710347060A CN 107144339 A CN107144339 A CN 107144339A
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- optic modulator
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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Abstract
The invention discloses a kind of distributed optical fiber sensing system based on modulation pulse technique, including：Light source, acousto-optic modulator, function generator, erbium-doped fiber amplifier, optical filter, three port circulators, long-distance sensing optical fiber, photodetector and data collecting card.The above-mentioned system based on modulation pulse technique can realize the measurement for being accurately positioned and being vibrated with wideband in the range of long range simultaneously.
Description
Technical field
The present invention relates to a kind of distributed optical fiber sensing system, more particularly to a kind of distribution based on modulation pulse technique
Optical fiber wideband sensor-based system.
Background technology
Vibration measurement has potential applying value, such as monitoring structural health conditions, Aero-Space, oil in engineering field
The safety monitorings such as work, power system；Traditional vibration measurement method such as Mechanical measurement method, electrometric method, it is low to there is sensitivity,
The problems such as volume is big, measurement range is limited by amplifying device, and traditional vibration measurement method can only carry out point measurement,
It is restricted in practice, therefore it is imperative to develop high performance Vibration-Measuring System.
Distributed Optical Fiber Sensing Techniques refer to along the external signal on optical fiber transmission path in some way in optical fiber
Light wave constantly modulated, with realize to be measured field continuous space measured in real time, optical fiber is both light-conductive media,
Simultaneously as sensing element, extraneous vibration signal is sensed.
The vibration sensing system based on optical fiber technology is studied widely, but existing measurement means in the prior art
The accurate measurement of vibration position and wideband vibration signal can not be all realized simultaneously, it is difficult to reach that the technology in practical engineering application refers to
Mark.To realize modern Large Infrastructure Projects monitoring structural health conditions, it certainly will simultaneously realize and wideband in the range of long range is vibrated
The measurement of signal and the accurate judgement of vibration position, and will control system cost to a certain extent on this basis, promote
System moves towards the market of practical engineering application as early as possible.
The content of the invention
The problem of in background technology, the present invention proposes a kind of distributed optical fiber sensing system, and the present invention is proposed
A kind of distributed optical fiber sensing system, it is filtered by light source, acousto-optic modulator, function generator, erbium-doped fiber amplifier, light
Device, three port circulators, sensor fibre, photodetector and data collecting card composition；The input of light source and acousto-optic modulator
Light path is connected, and the output end 1 of function generator is connected with the drive end of acousto-optic modulator；Acousto-optic modulator is adjusted to input light
By light output to erbium-doped fiber amplifier after system processing, erbium-doped fiber amplifier is amplified after processing to input light by light output
Denoising Processing is carried out to optical filter, the light after denoising Processing is transmitted to the input of three port circulators by optical filter,
The output end of three port circulators and one end of sensor fibre are connected, and three port circulators are to extract in sensor fibre by modulating
The backward Rayleigh scattering light that light pulse is produced；The transmitting-receiving multiplexing end of three port circulators and the input of photodetector are connected,
The output end of photodetector is connected to data collecting card, the output end 2 of function generator and the trigger collection of data collecting card
End connection；Sensor fibre is layed in detected space.
Based on said structure, the drive end of the connection of port 1 acousto-optic modulator of function generator produces repetition rate and is
10kHz modulation electric impulse signal, burst pulse pulsewidth is that 50ns, amplitude are 1V, and background light level amplitude is 200mV；Acousto-optic is adjusted
Device processed exports modulating light pulse signal under the electric impulse signal modulation that function generator is exported；The output end 2 of function generator
The trigger collection end for connecting data collecting card produces the identical electric impulse signal of and function generator output end 1.The function occurs
Parameter described in device is one group of more excellent parameter that the present invention chooses, it is impossible to the interest field of the present invention is limited with this.
The method have the benefit that：Can be in a system while realizing vibration letter using pulse technique is modulated
Number it is accurately positioned the measurement vibrated with wideband.
The present invention Cleaning Principle be：The electric impulse signal that function generator produces modulation is used as the driving of acousto-optic modulator
Signal, the continuous light of light source output is modulated to modulating light pulse signal by acousto-optic modulator, and modulating light pulse signal is by high intensity
Narrow pulse signal and the quasi-continuous bias light composition of low-intensity, modulating light pulse enter erbium-doped fiber amplifier and carry out light amplification, light
Signal then passes through optical filter and filters out spontaneous emission noise, filters out the modulating light pulse signal after spontaneous emission noise by three
Port circulator injection sensor fibre, and to Rayleigh scattering light after being inspired in sensor fibre, when extraneous vibration acts on biography
When on photosensitive fibre, it will cause the phase of backward Rayleigh scattering light in the range of modulating light pulse to change, after the Rayleigh of return
Collected to scattered light by three port circulators, photodetector is under the output electric signal triggering of function generator from three port rings
The output end of shape device gathers backward Rayleigh scattering light；A large amount of scattered signals can be collected after multiple sampling periods, in meter
Average and difference processing is done in calculation machine to the Rayleigh scattering signal produced by high-intensity, narrow-band pulsed optical signals, vibration can be drawn
Positional information；The backward Rayleigh interference light signal produced by the quasi-continuous bias light of low-intensity is taken out, Fourier transformation is done to it, can
To draw the frequency information of vibration.Based on the above-mentioned course of work, it is possible to achieve wideband vibrates in sensor-based system position and frequency
Measurement.
Brief description of the drawings
Fig. 1 is schematic diagram of the intensity of present invention modulation pulsed optical signals in time domain.It is the cycle to modulate pulsed optical signals
Property signal, in a cycle, high-intensity, narrow-band pulsed optical signals intensity is, low strong pre-continuity degree background light intensity is。
Fig. 2 is that each equipment of system of distributed optical fiber sensing system embodiment of the present invention based on modulation pulse technique connects
Binding composition.
Embodiment
Technical scheme is described in detail in conjunction with accompanying drawing.
Referring to accompanying drawing 2, present system by：Light source 1, acousto-optic modulator 2, function generator 3, EDFA Erbium-Doped Fiber Amplifier 4,
Optical filter 5, three port circulators 6, sensor fibre 7, photodetector 8 and data collecting card 9 are constituted.Light source 1 is adjusted with acousto-optic
The input light path connection of device 2 processed, the output end 1 of function generator 3 is connected with the drive end of acousto-optic modulator, acousto-optic modulator
2 pairs of input lights are input to EDFA Erbium-Doped Fiber Amplifier 4 after handling, EDFA Erbium-Doped Fiber Amplifier 4 is to input optical signal enhanced processing
Afterwards, optical signal is input to optical filter 5, optical filter 5 carries out denoising Processing to optical signal, the output end of optical filter 5 with
The input light path connection of three port circulators 6, the filtered optical signal of optical filter 5 is input to the defeated of three port circulators 6
Enter end, the transmitting-receiving multiplexing end of three port circulators 6 is connected with sensor fibre 7, and output port and the photoelectricity of three port circulators 6 are visited
The input port connection of device 8 is surveyed, the output port of photodetector 8 is connected with the input port of data collecting card 9, data acquisition
The output port 2 of the triggering collection end and function generator 3 of card 9 is connected；Sensor fibre 7 is layed in detected space.
The course of work of aforementioned means is：Function generator 3 modulates electric impulse signal, acousto-optic to the output of acousto-optic modulator 2
The light modulation that modulator 2 exports light source 1 according to modulation electric impulse signal is modulation pulsed optical signals, the light letter in each cycle
Number be made up of high-intensity, narrow-band pulsed light and low intensity background light, the optical signal of modulation as shown in Figure 1, by modulating light pulse signal
It is input to EDFA Erbium-Doped Fiber Amplifier 4 and is amplified processing, because EDFA Erbium-Doped Fiber Amplifier 4 can be produced at spontaneous emission noise, amplification
Modulating light pulse signal after reason is input to optical filter 5, carries out the optical signal after denoising Processing, denoising Processing and is output to three ends
Mouth circulator 6, modulating light pulse signal is by entering sensor fibre 7 after three port circulators 6, modulating light pulse signal is in sensing
Backward Rayleigh scattering light is excited in optical fiber 7, when extraneous vibration acts on sensor fibre 7, causes the phase of backward Rayleigh scattering light
Change, backward Rayleigh scattering light enters the transmitting-receiving multiplexing port of three port circulators 6, by the output port of three port circulators 6
Photodetector 8 is output to, the optical signal received is switched to electric signal output to data collecting card 9, data by photodetector 8
Capture card 9 gathers the electric signal of the output of photodetector 8 under the trigger signal of the output port 2 of function generator 3, by multiple
After sampling period, data collecting card 9 collects a large amount of backward Rayleigh scattering signal data.
Function generator 3 produces the modulation electric impulse signal that repetition rate is 10kHz, and burst pulse pulsewidth is 50ns, amplitude
For 2V, background light level amplitude is 200mV.In the present invention, this parameter is more excellent one group of parameter, can swash narrow light pulse signal
The signal to noise ratio of hair is in OK range.Narrow optical pulse time domain narrow width, light intensity is high, carries vibration position information；Background light signal
For quasi-continuous light, light intensity is low, carries vibration frequency information.
The data collected are loaded into computer, takes out and carries the backward Rayleigh scattering signal that narrow light pulse signal is produced
Average and difference processing is done, the positional information of vibration signal is obtained；Take out the backward of the quasi-continuous background light signal generation of low-intensity
Rayleigh scattering interference light signal, Fast Fourier Transform (FFT) is done to it, obtains the frequency information of vibration signal.
Claims (2)
1. the present invention proposes a kind of distributed optical fiber sensing system, it is by light source（1）, acousto-optic modulator（2）, function generator
（3）, erbium-doped fiber amplifier（4）, optical filter（5）, three port circulators（6）, sensor fibre（7）, photodetector（8）With
Data collecting card（9）Composition；Light source（1）With acousto-optic modulator（2）Input light path connection, function generator（3）Output
End 1 and acousto-optic modulator（2）Drive end connection；Acousto-optic modulator（2）Light arteries and veins will be modulated by input light being modulated after processing
Signal output is rushed to erbium-doped fiber amplifier（4）, erbium-doped fiber amplifier（4）Input light is amplified light output after processing
To optical filter（5）Denoising Processing is carried out, the light after denoising Processing is by optical filter（5）Transmit to three port circulators（6）
Input, three port circulators（6）Output end and sensor fibre（7）One end connection, three port circulators（6）To carry
Take sensor fibre（7）In the backward Rayleigh scattering light that is produced by high-intensity, narrow-band pulsed optical signals and produced by the quasi-continuous light of low-intensity
Raw backward Rayleigh scattering interference light；Three port circulators（6）Transmitting-receiving multiplexing end and photodetector（8）Input connect
Connect, photodetector（8）Output end be connected to data collecting card（9）, function generator（3）Output end 2 and data acquisition
Card（9）Trigger collection end connection；Sensor fibre（7）It is layed in detected space.
2. distributed optical fiber sensing system according to claim 1, it is characterised in that：The preferred parameter of function generator is set
It is set to：The drive end of the connection of port 1 acousto-optic modulator of function generator produces repetition rate to be believed for 10kHz modulation electric pulse
Number, high-intensity, narrow-band pulse is that 50ns, amplitude are 2V, and the quasi-continuous background light level amplitude of low-intensity is 200mV；Acousto-optic modulation
Device exports modulating light pulse signal under the electric impulse signal modulation that function generator is exported；The output end 2 of function generator connects
The trigger collection end for connecing data collecting card produces the identical electric impulse signal of and function generator output end 1.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336605A (en) * | 2019-07-25 | 2019-10-15 | 广东复安科技发展有限公司 | A kind of fiber optic interferometric sensing positioning system of long range pinpoint accuracy |
| CN110376160A (en) * | 2019-08-05 | 2019-10-25 | 江苏禾吉新材料科技有限公司 | A kind of distribution type fiber-optic gas-detecting device and detection method based on frequency division multiplexing |
| WO2020032878A1 (en) | 2018-08-08 | 2020-02-13 | Aselsan Elektroni̇k Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ | Extinction ratio free phase sensitive optical time domain reflectometry based distributed acoustic sensing system |
| WO2020102311A1 (en) * | 2018-11-14 | 2020-05-22 | Saudi Arabian Oil Company | Optical fiber vibration sensor with improved signal to noise ratio management |
| CN111912516A (en) * | 2020-08-28 | 2020-11-10 | 电子科技大学中山学院 | Phase-synchronized optical fiber distributed vibration measurement device, driver and method |
| CN112285685A (en) * | 2020-10-16 | 2021-01-29 | 桂林电子科技大学 | Blind person indoor obstacle avoidance system based on distributed optical fiber sensing |
| US11339636B2 (en) | 2020-05-04 | 2022-05-24 | Saudi Arabian Oil Company | Determining the integrity of an isolated zone in a wellbore |
| US11519767B2 (en) | 2020-09-08 | 2022-12-06 | Saudi Arabian Oil Company | Determining fluid parameters |
| US11530597B2 (en) | 2021-02-18 | 2022-12-20 | Saudi Arabian Oil Company | Downhole wireless communication |
| US11603756B2 (en) | 2021-03-03 | 2023-03-14 | Saudi Arabian Oil Company | Downhole wireless communication |
| US11619114B2 (en) | 2021-04-15 | 2023-04-04 | Saudi Arabian Oil Company | Entering a lateral branch of a wellbore with an assembly |
| US11644351B2 (en) | 2021-03-19 | 2023-05-09 | Saudi Arabian Oil Company | Multiphase flow and salinity meter with dual opposite handed helical resonators |
| US11913464B2 (en) | 2021-04-15 | 2024-02-27 | Saudi Arabian Oil Company | Lubricating an electric submersible pump |
| US11920469B2 (en) | 2020-09-08 | 2024-03-05 | Saudi Arabian Oil Company | Determining fluid parameters |
| US11994016B2 (en) | 2021-12-09 | 2024-05-28 | Saudi Arabian Oil Company | Downhole phase separation in deviated wells |
| US12085687B2 (en) | 2022-01-10 | 2024-09-10 | Saudi Arabian Oil Company | Model-constrained multi-phase virtual flow metering and forecasting with machine learning |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020032878A1 (en) | 2018-08-08 | 2020-02-13 | Aselsan Elektroni̇k Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇ | Extinction ratio free phase sensitive optical time domain reflectometry based distributed acoustic sensing system |
| US11959799B2 (en) | 2018-08-08 | 2024-04-16 | Aselsan Elektronik Sanayi Ve Ticaret Anonim Sirketi | Extinction ratio free phase sensitive optical time domain reflectometry based distributed acoustic sensing system |
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| WO2020102311A1 (en) * | 2018-11-14 | 2020-05-22 | Saudi Arabian Oil Company | Optical fiber vibration sensor with improved signal to noise ratio management |
| CN110336605A (en) * | 2019-07-25 | 2019-10-15 | 广东复安科技发展有限公司 | A kind of fiber optic interferometric sensing positioning system of long range pinpoint accuracy |
| CN110376160A (en) * | 2019-08-05 | 2019-10-25 | 江苏禾吉新材料科技有限公司 | A kind of distribution type fiber-optic gas-detecting device and detection method based on frequency division multiplexing |
| US11339636B2 (en) | 2020-05-04 | 2022-05-24 | Saudi Arabian Oil Company | Determining the integrity of an isolated zone in a wellbore |
| CN111912516A (en) * | 2020-08-28 | 2020-11-10 | 电子科技大学中山学院 | Phase-synchronized optical fiber distributed vibration measurement device, driver and method |
| US11519767B2 (en) | 2020-09-08 | 2022-12-06 | Saudi Arabian Oil Company | Determining fluid parameters |
| US11920469B2 (en) | 2020-09-08 | 2024-03-05 | Saudi Arabian Oil Company | Determining fluid parameters |
| CN112285685A (en) * | 2020-10-16 | 2021-01-29 | 桂林电子科技大学 | Blind person indoor obstacle avoidance system based on distributed optical fiber sensing |
| US11530597B2 (en) | 2021-02-18 | 2022-12-20 | Saudi Arabian Oil Company | Downhole wireless communication |
| US11603756B2 (en) | 2021-03-03 | 2023-03-14 | Saudi Arabian Oil Company | Downhole wireless communication |
| US11644351B2 (en) | 2021-03-19 | 2023-05-09 | Saudi Arabian Oil Company | Multiphase flow and salinity meter with dual opposite handed helical resonators |
| US11619114B2 (en) | 2021-04-15 | 2023-04-04 | Saudi Arabian Oil Company | Entering a lateral branch of a wellbore with an assembly |
| US11913464B2 (en) | 2021-04-15 | 2024-02-27 | Saudi Arabian Oil Company | Lubricating an electric submersible pump |
| US11994016B2 (en) | 2021-12-09 | 2024-05-28 | Saudi Arabian Oil Company | Downhole phase separation in deviated wells |
| US12085687B2 (en) | 2022-01-10 | 2024-09-10 | Saudi Arabian Oil Company | Model-constrained multi-phase virtual flow metering and forecasting with machine learning |
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