CN107941253A - A kind of fiber optic loop sensor-based system and implementation method - Google Patents
A kind of fiber optic loop sensor-based system and implementation method Download PDFInfo
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- CN107941253A CN107941253A CN201711024841.6A CN201711024841A CN107941253A CN 107941253 A CN107941253 A CN 107941253A CN 201711024841 A CN201711024841 A CN 201711024841A CN 107941253 A CN107941253 A CN 107941253A
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- 239000013307 optical fiber Substances 0.000 claims description 41
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- 238000005086 pumping Methods 0.000 description 2
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- 229910052691 Erbium Inorganic materials 0.000 description 1
- 230000005374 Kerr effect Effects 0.000 description 1
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- 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
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Abstract
The invention discloses a kind of fiber optic loop sensor-based system and implementation method.The system includes chaos light source, at least one fiber optic splitter, at least one fiber optic loop, at least one sensing head and data processing equipment；Sensing head is arranged on the predeterminated position of fiber optic loop, chaos light source is of coupled connections with fiber optic splitter input terminal, the first output terminal of fiber optic splitter is of coupled connections with fiber optic loop input terminal, and fiber optic loop output terminal, the second output terminal of fiber optic splitter are all connected with data processing equipment；Data processing equipment is used to receiving and handling fiber optic loop and the output signal of the second output terminal of fiber optic splitter, and exports measurement result.The technical solution of the embodiment of the present invention, by using chaotic laser light replace pulse laser formed fiber optic loop sensor-based system, avoid pulse laser dispersion caused by error problem, reach higher precision measurement effect.
Description
Technical field
The present embodiments relate to optical fiber sensing technology, more particularly to a kind of fiber optic loop sensor-based system and implementation method.
Background technology
Optical fiber sensing technology is the technology developed rapidly with the development of optical fiber technology the 1970s,
With tradition machinery compared with electric information sensor, fibre optical sensor has simple in structure, high sensitivity, from electromagnetic interference, electricity
Good insulating, many advantages such as corrosion-resistant, small, cost is low, in national defense and military, aerospace, petrochemical industry, electric power
The every field such as industry are widely used.
Fiber optic loop, which declines, swings sensing technology and is based on Lambert-Beer's law, and when pulse laser is injected into fiber optic loop, pulse can be
Circulation in fiber optic loop, due to the loss of fiber optic loop and the output of beam splitter, the light intensity in ring can be decayed with exponential form, when to be measured
When physical quantity influences the loss of fiber optic loop, pulse can be caused to decline and swing the change of curve.Declined by measurement and swing curvilinear motion with regard to that can obtain
Know the situation of change of measured physical quantity.Optical fiber ring length is shorter, and sensor accuracy is higher, but since pulse laser passes in a fiber
It is defeated broadening to occur due to dispersion, so as to influence measurement accuracy, according to means such as dispersion compensations, and system cost can be made significantly
Increase, difficulty is brought to product practicality.
The embodiment of the present invention provides a kind of fiber optic loop sensor-based system, relative to traditional pulse type optical fiber loop sensor, can reach
To the precision of higher.
The content of the invention
The present invention provides a kind of fiber optic loop sensor-based system, compared with traditional pulse type optical fiber loop sensor, can reach higher
Precision.
In a first aspect, the embodiment of the present invention carries a kind of fiber optic loop sensor-based system, including chaos light source, at least one optical fiber point
Beam device, at least one fiber optic loop, at least one sensing head and data processing equipment；
The sensing head is arranged on the predeterminated position of the fiber optic loop, and the chaos light source is inputted with the fiber optic splitter
End is of coupled connections, and first output terminal of fiber optic splitter is of coupled connections with the fiber optic loop input terminal, the fiber optic loop output
End, the second output terminal of the fiber optic splitter are connected with the data processing equipment；
The data processing equipment is used to receiving and handling the fiber optic loop and second output terminal of fiber optic splitter
Signal is exported, and exports measurement result.
Further, the chaos laser is circular cavity optic fibre laser, linear cavity fiber laser either eight words
One kind in shape cavity optical fibre laser.
Further, the operation wavelength of the chaos light source is 1520-1590nm.
Further, the fiber optic splitter is that splitting ratio is 95：5 single ended input both-end output optical fibre beam splitter；
Wherein, the first output terminal output intensity is the 95% of input light intensity, and the second output terminal output intensity is input
The 5% of light intensity.
Further, the fiber optic loop includes the first fiber optic splitter OC1, the second fiber optic splitter OC2；The OC1's
Input terminal is connected with the input terminal of the OC2, and the first output terminal of the OC1 is connected with the first output terminal of the OC2, described
Input terminal and output terminal of the second output terminal of OC1 with the second output terminal of the OC2 respectively as the fiber optic loop.
Further, the OC1 is identical with the OC2, is all more than 90 for splitting ratio：10 single ended input both-end output light
Fine beam splitter.
Further, the data processing equipment includes photodetector, oscillograph and computer；
The photodetector is used for the optical signal by the fiber optic loop and second output terminal of fiber optic splitter output
It is converted into electric signal；
The oscillograph is used to gather the electric signal, and generates data；
The computer is used to analyze and process the data, and exports measurement result.
Further, the analyzing and processing is cross-correlation operation.
Further, the sensing head for Fiber Bragg Grating FBG, long-period fiber grating, Fabry-Perot fiber optic chamber,
One kind in optical fiber micro-bending device, single mode optical fiber.
Second aspect, the embodiment of the present invention additionally provide a kind of fiber optic loop sensor-based system implementation method, the described method includes：
A branch of chaotic laser light is produced from chaos light source, and the chaotic laser light is divided into reference beam and signal by fiber optic splitter
Light beam, the signal beams incidence is into fiber optic loop；
The chaotic laser light is propagated in the fiber optic loop, and has part chaotic laser light to be exported from fiber optic loop output terminal；
The part chaotic laser light and the reference beam export result by data processing equipment acquisition process.
Brief description of the drawings
Fig. 1 is the fiber optic loop sensor-based system structure diagram in the embodiment of the present invention one；
Fig. 2 is declining and swing schematic diagram after the fiber optic loop output chaotic laser light correlation in the embodiment of the present invention one；
Fig. 3 is the fiber optic loop structure diagram in the embodiment of the present invention one；
Fig. 4 is the fiber optic loop sensor-based system implementation method flow diagram in the embodiment of the present invention two；
Fig. 5 is the structure diagram of the fiber optic loop sensor-based system measurement pressure in the embodiment of the present invention three；
Fig. 6 is the measurement result schematic diagram in the embodiment of the present invention three.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that in order to just
It illustrate only part related to the present invention rather than entire infrastructure in description, attached drawing.
Embodiment one
Fig. 1 is the fiber optic loop sensor-based system structure diagram that the embodiment of the present invention one provides, which includes chaos
Light source 100, at least one fiber optic splitter 110, at least one fiber optic loop 120, at least one sensing head 130 and data processing dress
Put 140；
Sensing head 130 is arranged on the predeterminated position of fiber optic loop 120, chaos light source 100 and 110 input terminal coupling of fiber optic splitter
Connection is closed, 110 first output terminal of fiber optic splitter is of coupled connections with 120 input terminal of fiber optic loop, 120 output terminal of fiber optic loop, optical fiber
110 second output terminal of beam splitter is all connected with data processing equipment 140；
Data processing equipment 140 is used to receiving and handling fiber optic loop 120 and the output of 110 second output terminal of fiber optic splitter
Signal, and export measurement result.
Wherein, chaos light source 100 can be chaos laser, for exporting chaotic laser light.Chaotic laser light is that laser is defeated
A kind of special shape gone out, has noise like, the characteristic of wide spectrum, its auto-correlation has the characteristic similar to δ functions.If will be same
A branch of chaotic laser light is divided into two beams, then the cross-correlation of two-beam is also similar to that δ functions.Fiber optic loop 120 can be by two optical fiber point
Beam device is formed, and including input terminal and output terminal, chaotic laser light is input to fiber optic loop 120 by fiber optic splitter 110, to optical fiber
Ring 120 exports the reference signal that signal is exported with 110 second output terminal of fiber optic splitter and gathers at the same time, and carries out cross-correlation behaviour
Make, it may appear that swing phenomenon similar to declining of being produced in fiber optic loop 120 of pulse laser, be illustrated in figure 2 the output letter of fiber optic loop 120
Number decline the schematic diagram that swings with the similar pulse of generation after the reference signal cross-correlation of 110 second output terminal of fiber optic splitter output.Pass
Sense first 130 is arranged on the predetermined position of fiber optic loop 120, and sensing head 130 and fiber optic loop 120 form the biography of fiber optic loop sensor-based system
Sensor structure, when sensing head 130 is subject to the measured physical quantity such as pressure to act on, can bring added losses to fiber optic loop 120,
And then 120 output terminal of fiber optic loop output signal is changed, it is defeated that data processing equipment 140 connects fiber optic splitter 110 second
The output terminal of outlet and fiber optic loop 120, can export thing to be measured with the optical signal of Rreceive output, gathered data after carrying out cross-correlation
The result of reason amount.
The technical solution of the present embodiment, replaces pulse laser to form fiber optic loop sensor-based system, keeps away by using chaotic laser light
Error problem caused by having exempted from pulse laser dispersion, reaches the effect of higher precision measurement.
Further, chaos light source 100 can be circular cavity optic fibre laser, linear cavity fiber laser either eight words
One kind in shape cavity optical fibre laser, be advantageous in that with optical fiber laser more easily can be coupled into light by chaotic laser light
Fine beam splitter 110.
It is understood that chaos light source includes pumping source, wavelength division multiplexer, Polarization Controller, gain fibre, optical fiber point
The devices such as beam device form annular chamber, linear cavity or splayed configuration chamber, those skilled in the art and can flexibly be selected according to condition.
Further, the operation wavelength of chaos light source 100 can be 1520-1590nm.
It is understood that the optical fiber formed used in fiber optic loop 120 can use communication general single mode fiber, laser
Erbium doped fiber laser can be selected, it has larger gain in the range of 1520-1590nm, and the laser of this wave-length coverage is in light
Inherent loss is smaller in fibre.
Further, fiber optic splitter 110 is that splitting ratio can be 95：5 single ended input both-end output optical fibre beam splitter.
It is understood that the chaotic laser light that chaos light source 100 is sent is divided into intensity ratio for 95 by fiber optic splitter 110：5
Two-beam, wherein the chaotic laser light of the first output terminal output 95% as flashlight, is then input to fiber optic loop 120, second
The chaotic laser light of output terminal output 5% is gathered by data processing equipment 140.
Further, fiber optic loop 120 includes the first fiber optic splitter OC1, the second fiber optic splitter OC2；The input terminal of OC1
It is connected with the input terminal of OC2, the first output terminal of the first output terminal of OC1 and OC2 connect, the second output terminal of OC1 and OC2's
Input terminal and output terminal of second output terminal respectively as fiber optic loop 120.
Preferably, OC1 is identical with OC2, is all more than 90 for splitting ratio：10 single ended input both-end output optical fibre beam splitter.
Fig. 3 show 120 structure diagram of fiber optic loop, and the predetermined position of fiber optic loop 120 is provided with sensing head 130.Can
With understanding, since the full width at half maximum of the cross-correlation of chaotic signal is unrelated with propagation distance, that is, it is not present similar to pulse
Dispersion phenomenon, therefore the length of fiber optic loop 120 can be reduced, improve sensitivity.OC1 and OC2 can also be double-width grinding both-end
Output optical fibre splitter, two fiber optic splitters respectively have one end to leave unused during use.In order to reduce the inherent loss of fiber optic loop 120,
The preferred splitting ratios of OC1 and OC2 are more than 90：10.
Further, data processing equipment 140 includes photodetector, oscillograph and computer；Photodetector is used for
The optical signal of fiber optic loop 120 and the output of 110 second output terminal of fiber optic splitter is converted into electric signal；Oscillograph is used to gather electricity
Signal, and generate data；Computer is used to analyze and process the data, and exports measurement result.
It is understood that the output terminal of fiber optic loop 120 and the second output terminal of fiber optic splitter 110 are connected respectively to light
Electric explorer, photodetector can be in-Ga-As photoelectric detectors, and the optical signal received is converted to electric signal and through number
Oscillograph is passed to according to line, oscillograph can be digital oscilloscope, and computer can be connected by USB with oscillograph, for handling
The data of oscillograph collection, such as can in real time be gathered by LabVIEW and export measurement result.
Further, analyze and process as cross-correlation operation.
Wherein, cross-correlation operation can be carried out using Matlab, can also be handled in real time using LabVIEW.
Further, sensing head 130 for Fiber Bragg Grating FBG, long-period fiber grating, Fabry-Perot fiber optic chamber,
One kind in optical fiber micro-bending device, single mode optical fiber.
It is understood that Fiber Bragg Grating FBG, long-period fiber grating, Fabry-Perot fiber optic chamber are all optical fiber
Device, can be directly accessed in fiber optic loop 120, and optical fiber micro-bending device includes two tooth-shape structures, and grip optical fiber ring 120 presets position
Put, single mode optical fiber is more sensitive to extraneous measured physical quantity in itself, can also be used as sensing head.
The embodiment of the present invention replaces pulse laser to form fiber optic loop sensor-based system by using chaotic laser light, avoids pulse
Error problem caused by laser dispersion, reaches the effect of higher precision measurement.
Embodiment two
Fig. 4 be fiber optic loop sensor-based system implementation method provided by Embodiment 2 of the present invention in flow diagram, this method
Including：
Step 210, a branch of chaotic laser light from chaos light source produce, chaotic laser light by fiber optic splitter be divided into reference beam and
Signal beams, signal beams incidence is into fiber optic loop.
Wherein, chaos light source can be circular cavity optic fibre laser, linear cavity fiber laser either splayed chamber light
One kind in fibre laser, the chaotic laser light of output is divided into two beams by fiber optic splitter, such as the first output terminal exports 95%
Chaotic laser light, as signal beams, the chaotic laser light of the second output terminal output 5%, as with reference to light beam, the output of the first output terminal
Chaotic laser light fiber optic loop is coupled into by the input terminal of fiber optic loop.
Step 220, chaotic laser light are propagated in fiber optic loop, and have part chaotic laser light to be exported from fiber optic loop output terminal.
Wherein, can decay when being transmitted due to chaotic laser light in fiber optic loop, output optical signal and the ginseng of collection at the same time
Examine signal cross-correlation and occur and swing signal in declining of transmitting of fiber optic loop similar to pulse.
Step 230, part chaotic laser light and reference beam export result by data processing equipment acquisition process.
Data processing equipment can include photodetector, oscillograph and computer；Photodetector is used for fiber optic loop
Electric signal is converted into the optical signal of the second output terminal of fiber optic splitter output；Oscillograph is used to gather electric signal, and generates number
According to；Computer is used to analyze and process the data, and exports measurement result.
It is understood that the output terminal of fiber optic loop is connected respectively to photodetection with the second output terminal of fiber optic splitter
Device, photodetector can be in-Ga-As photoelectric detectors, and the optical signal received is converted to electric signal and is passed through data cable
To oscillograph, oscillograph can be digital oscilloscope, and computer can be connected by USB with oscillograph, for handling oscillograph
The data of collection, such as can in real time be gathered by LabVIEW and export measurement result after carrying out cross-correlation operation.
The chaos fiber optic loop process swung that declines can use following principles illustrated：
According to Lang Po-Bill's formula, chaotic laser light strength change laws in fiber optic loop meet equation below：
Wherein, I represents that chaotic laser light is in the intensity of t moment in fiber optic loop；L represents the length of fiber optic loop；C represents light true
Aerial speed；N represents the effective refractive index of fibre core；A represents the total losses of fiber optic loop, the absorption loss comprising optical fiber, coupling
Device insertion loss, junction loss and scattering loss, can be expressed from the next：
A=α2L+E+β (2)
Wherein, α2Represent unit length fiber absorption coefficient；E represents the insertion loss and junction loss in fiber optic loop；β tables
Show the scattering loss of optical fiber；
It can be obtained by (1) integration：
Wherein, I0Represent the light intensity of chaotic laser light, the second output terminal of fiber optic splitter and optical fiber that photodetector receives
Ring output end signal, which makees cross-correlation, to be obtained：
Wherein,Represent computing cross-correlation, define cross-correlation peak value and be reduced to time for being needed during the 1/e of initial value to decline
Swing time τ0, can be represented with following formula：
When measured physical quantity is applied on sensing head, it is B to cause fiber optic loop added losses, and ring-down time meets following formula：
It can be obtained by formula (4) and (5)：
From formula (6), inverse and the fiber optic loop added losses of ring-down time have linear relationship, measure and decline when swinging
Between can draw fiber optic loop added losses, and then draw measured physical quantity.
The technical solution of the present embodiment, replaces pulse laser to form fiber optic loop sensor-based system, keeps away by using chaotic laser light
Error problem caused by having exempted from pulse laser dispersion, reaches the effect of higher precision measurement.
Embodiment three
Fig. 5 show the structure diagram of the fiber optic loop sensor-based system of the offer of the embodiment of the present invention three, and the present embodiment can be with
Based on above-described embodiment, there is provided a kind of preferred embodiment.
With reference to figure 5, fiber optic loop sensor-based system provided in an embodiment of the present invention includes chaos light source 100, fiber optic splitter
(OC4) 110, fiber optic loop 120, sensing head 130 and data processing equipment 140.
Wherein, chaos light source 100 is annular Er-doped fiber chaos laser, its basic principle is：Semiconductor laser
(LD) pump light of the 980nm produced is by the Er-doped fiber (EDF) of wavelength division multiplexer (WDM) pumping 6.5m long, subsequently into
In the single mode optical fiber of 5km long, when light passes through output coupler (OC3), 10% light output, 90% light is in cavity circulation, partially
The controller (PC) that shakes adjusts the polarization state of light, polarizes the one-way transmission that unrelated isolator (PI-ISO) ensures light in optical fiber, due to
The chaotic laser light that Kerr effect produces is divided into two beams by OC4110, wherein 95% chaos light is input in fiber optic loop 120.
It is 95 that fiber optic loop 120, which includes two splitting ratios,：5 fiber optic splitter OC1 and OC2, its generation type and above-mentioned reality
It is identical to apply example, optical fiber ring length is 5.6m in the present embodiment.
Sensing head 130 utilizes optical fiber micro-bending device.
Data processing equipment 140 includes photoelectric detector PD 1 and PD2, oscillograph OSC and computer Computer；PD1 is used
Electric signal is converted into the reference beam signal that OC4 110 is exported to 5%, PD2 is used for the signal beams for exporting fiber optic loop 120
Signal is converted into electric signal；OSC is used to gather electric signal, and generates data；Computer is used for analyzing and processing data, and exports
Measurement result.
Apply different pressure P to sensing head 130, can cause to decline and swing the change of signal, ring-down time is stressed with applying
Relation is：
Wherein τ and τ0Represent to apply the ring-down time before and after pressure respectively；K represents proportionality coefficient.
Fig. 6 show the pressure result of the present embodiment measurement, and (a) declines for the cross-correlation under different pressures and swing curve, be fitted
(1/τ-1/τ0) and pressure linear relationship such as Fig. 6 (b) shown in, (1/ τ -1/ τ can be obtained according to formula (7)0) with the relation of pressure be：
(1/ τ -1/ τ are understood by Fig. 6 (b)0) with P there is good linear relationship (R2=0.99954), and from formula (8)
Transducer sensitivity is 0.00223/ (nsN).
The technical solution of the present embodiment, replaces pulse laser to form fiber optic loop sensor-based system, keeps away by using chaotic laser light
Error problem caused by having exempted from pulse laser dispersion, reaches the effect of higher precision measurement.
Note that it above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
It can include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. a kind of fiber optic loop sensor-based system, it is characterised in that at least one including chaos light source, at least one fiber optic splitter
Fiber optic loop, at least one sensing head and data processing equipment；
The sensing head is arranged on the predeterminated position of the fiber optic loop, the chaos light source and the fiber optic splitter input terminal coupling
Connection is closed, first output terminal of fiber optic splitter is of coupled connections with the fiber optic loop input terminal, the fiber optic loop output terminal, institute
The second output terminal of fiber optic splitter is stated all to be connected with the data processing equipment；
The data processing equipment is used to receiving and handling the fiber optic loop and the output of second output terminal of fiber optic splitter
Signal, and export measurement result.
2. fiber optic loop sensor-based system according to claim 1, it is characterised in that the chaos laser is annular chamber optical fiber
One kind in laser, linear cavity fiber laser either splayed cavity optical fibre laser.
3. fiber optic loop sensor-based system according to claim 2, it is characterised in that the operation wavelength of the chaos light source is
1520-1590nm。
4. fiber optic loop sensor-based system according to claim 1, it is characterised in that the fiber optic splitter is that splitting ratio is
95：5 single ended input both-end output optical fibre beam splitter；
Wherein, the first output terminal output intensity is the 95% of input light intensity, and the second output terminal output intensity is input light intensity
5%.
5. fiber optic loop sensor-based system according to claim 1, it is characterised in that the fiber optic loop includes the first fiber beam splitting
Device OC1, the second fiber optic splitter OC2；The input terminal of the OC1 is connected with the input terminal of the OC2, and the first of the OC1 is defeated
Outlet is connected with the first output terminal of the OC2, and the second output terminal of the OC1 is made respectively with the second output terminal of the OC2
For the input terminal and output terminal of the fiber optic loop.
6. fiber optic loop sensor-based system according to claim 5, it is characterised in that the OC1 is identical with the OC2, all for
Splitting ratio is more than 90：10 single ended input both-end output optical fibre beam splitter.
7. fiber optic loop sensor-based system according to claim 1, it is characterised in that the data processing equipment is visited including photoelectricity
Survey device, oscillograph and computer；
The photodetector is used to change the optical signal of the fiber optic loop and second output terminal of fiber optic splitter output
Into electric signal；
The oscillograph is used to gather the electric signal, and generates data；
The computer is used to analyze and process the data, and exports measurement result.
8. fiber optic loop sensor-based system according to claim 7, the analyzing and processing is cross-correlation operation.
9. fiber optic loop sensor-based system according to claim 1, it is characterised in that the sensing head is optical fiber Bragg light
One kind in grid, long-period fiber grating, Fabry-Perot fiber optic chamber, optical fiber micro-bending device, single mode optical fiber.
A kind of 10. fiber optic loop sensor-based system implementation method, it is characterised in that the described method includes：
A branch of chaotic laser light is produced from chaos light source, and the chaotic laser light is divided into reference beam and flashlight by fiber optic splitter
Beam, the signal beams incidence is into fiber optic loop；
The chaotic laser light is propagated in the fiber optic loop, and has part chaotic laser light to be exported from fiber optic loop output terminal；
The part chaotic laser light and the reference beam export result by data processing equipment acquisition process.
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| CN107941254A (en) * | 2017-11-22 | 2018-04-20 | 朱秋华 | A kind of fiber grating sensing system and its demodulation method |
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| JP2004361332A (en) * | 2003-06-06 | 2004-12-24 | Fujikura Ltd | Method and system for identifying oscillation position using optical fiber ring interference type oscillation sensor |
| CN101271241A (en) * | 2008-05-05 | 2008-09-24 | 浙江大学 | Method and equipment for multiplexing and demodulating long period optical fiber optical grating array |
| CN101298992A (en) * | 2008-06-05 | 2008-11-05 | 西北工业大学 | Distributed type fiber optic sensor based on optical fiber cavity attenuation and vibration technique |
| CN106123933A (en) * | 2016-07-18 | 2016-11-16 | 太原理工大学 | A kind of chaos fiber optic loop declines and swings sensing device and method |
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2017
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| JP2004361332A (en) * | 2003-06-06 | 2004-12-24 | Fujikura Ltd | Method and system for identifying oscillation position using optical fiber ring interference type oscillation sensor |
| CN101271241A (en) * | 2008-05-05 | 2008-09-24 | 浙江大学 | Method and equipment for multiplexing and demodulating long period optical fiber optical grating array |
| CN101298992A (en) * | 2008-06-05 | 2008-11-05 | 西北工业大学 | Distributed type fiber optic sensor based on optical fiber cavity attenuation and vibration technique |
| CN106123933A (en) * | 2016-07-18 | 2016-11-16 | 太原理工大学 | A kind of chaos fiber optic loop declines and swings sensing device and method |
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| CN107941254A (en) * | 2017-11-22 | 2018-04-20 | 朱秋华 | A kind of fiber grating sensing system and its demodulation method |
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