CN106949850B - A kind of the optical fiber shape sensing measuring method and system of HIGH SENSITIVITY AND HIGH PRECISION - Google Patents
A kind of the optical fiber shape sensing measuring method and system of HIGH SENSITIVITY AND HIGH PRECISION Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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Abstract
The present invention provides the optical fiber shape sensing measuring methods and system of a kind of HIGH SENSITIVITY AND HIGH PRECISION.In method, shape sensor is divided into several segments, each section of Brillouin shift knots modification is averaged, it finds out it and corresponds to bending curvature of the curvature as this section, each section in this way of curvature, which can be found out, to be come, we have just obtained the circular arc of one section of one section of equal arc length before circular arc splices in this way, first select the coordinate and its tangential direction of the initial segment endpoint, then it needs to determine the bending direction of circular arc, then the tail end of this series of arc the preceding paragraph and next section of head end are connected, keep tangential direction identical at tie point, this completes the reduction of global shape.System includes: laser, 50:50 coupler, Polarization Controller one, arbitrary-function generator, electrooptic modulator one, EDFA Erbium-Doped Fiber Amplifier, circulator, filter, sensor, photodetector, data collecting card, isolator, electrooptic modulator two, microwave source and Polarization Controller two.
Description
Technical field
The present invention relates to the optical fiber shape sensing measuring methods and system of a kind of HIGH SENSITIVITY AND HIGH PRECISION, belong to optical fiber shape
Sensing measuring method and systems technology field.
Background technique
With occurring quantum jump the 1960s in terms of fibre loss, optical fiber is passed as an effectively reliable light
Defeated medium is widely used in communication and sensory field.Ordinary optic fibre main component is SiO2, abundant raw materials, manufacturing cost
It is low；Since it is relative to common metal sensor and cable, density is small, therefore under equidistant, having smaller volume, more
Light quality is conducive to lay and integrate.And optical fiber also has that electromagnetism interference, electrical insulating property are good, stability is good etc.
Plurality of advantages has the incomparable advantage of electric sensor in sensory field, defense military, aerospace, deep-sea detecting,
The numerous areas such as Industry Control, civil construction, which have, to be widely applied.
Distributed Optical Fiber Sensing Techniques are to utilize the parameter of light wave distribution along optical fiber, while acquisition quilt in sensitive zones
Measurement at any time with the distributed intelligence of spatial variations, be it is a kind of can over long distances, the continuous sensing technology that uses on a large scale.Optical fiber
The Brillouin frequency shifts amount in somewhere depends on the temperature and strain being subject at the position.The change of temperature and strain can make cloth
In deep frequency displacement change, by repeatedly measuring the frequency shift value of optical fiber everywhere, temperature and Ying Bianfen along optical fiber can be obtained
Cloth situation.After decades of development, very high level, and technology are substantially accomplished on distance sensing and sensing accuracy
It is very mature, have many advantages, such as spatial resolution is high, measurement accuracy is high, distance sensing is long etc..Yongkang in 2012
Dong et al. realizes the spatial resolution of 2cm using differential pulse to Brillouin optical time domain analysis technology on the optical fiber of 2km
(Dong Y,Zhang H,Chen L,et al.2cm spatial-resolution and 2km range Brillouin
optical fiber sensor using a transient differential pulse pair[J].Applied
optics,2012,51(9):1229-1235)。
Optical fiber shape sensing technology is then to pass through spy using the multiple strain transducers acquisition data being integrated on optical fiber
Fixed algorithm is handled and is restored.Single crooked sensory is sensed from basic bending curvature, till now, has been developed
To the degree for how carrying out sensing reduction to entire shape.Luna company, the U.S. etches FBG (optical fiber on 1.1m optical fiber within 2006
Grating, Fiber Bragg Grating), in conjunction with optical frequency domain reflection technology (Optical Frequency Domain
Reflectometry optical fiber shape sensing (Duncan R G, Raum M T.Characterization of a) is realized
fiber-optic shape and positionsensor[C].Smart Structures and
Materials.International Society for Optics andPhotonics,2006:616704-616704-
11).Chinese patent " a kind of distribution light that application publication number is CN105423944A, data of publication of application is on March 23rd, 2016
Fine curvature sensor ", application publication number CN105371781A, data of publication of application are the Chinese patent " one on March 2nd, 2016
Kind method for measuring three-dimensional shape ", application publication number CN105371785A, data of publication of application are that the China on March 2nd, 2016 is special
Sharp " a kind of curvature measurement method ", they propose that the Distributed Measurement System acquisition based on Brillouin scattering obtains spatial discrimination
Rate is the strain data of 20cm.
For existing optical fiber shape sensor, majority is all based on (fiber grating, Mach increasing Dare interference of interference formula
Instrument etc.) full distributed monitoring can not be carried out, mostly handled optical fiber, excessive processing meeting so that optical fiber loss
It increased dramatically, distance sensing is limited by very large.The technology space resolution ratio (>=20cm) proposed in terms of long-distance sensing
It is not enough to cope with the small scene of certain bending radius, there are short slabs.
Summary of the invention
The purpose of the present invention is to solve the above-mentioned problems of the prior art, and then it is high-precision to provide a kind of high sensitivity
The optical fiber shape sensing measuring method and system of degree.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of measurement method of the optical fiber shape sensing of HIGH SENSITIVITY AND HIGH PRECISION.
When object generates bending, side is stretched, and the other side is compressed, it is assumed that fiber core divides with a distance from neutral axis
It Wei not d1、d2, strain is respectively ε after bending1、ε2, non-length before bending be L, bending radius R, then:
L1=(1+ ε1)L (0-1)
L2=(1+ ε2)L (0-2)
Geometrical relationship are as follows:
Three equatioies obtain the relationship of strain and bending radius above simultaneous:
κ is curvature in formula, is the inverse of bending radius；
There are Brillouin shift knots modification and temperature, the relational expression for straining knots modification again are as follows:
△vB=CT·△T+Cε·△ε (0-5)
△ v in formulaBFor Brillouin shift knots modification, CTFor Brillouin shift temperature coefficient, △ T is temperature knots modification, CεFor
The Brillouin shift coefficient of strain, △ ε are strain knots modification, and Cong Shizhong finds out, Brillouin shift knots modification is in strain knots modification
Linear relationship obtains when temperature-resistant:
△vB=Cε·△ε (0-6)
There is Brillouin shift knots modification directly proportional to knots modification is strained, if initial strain is 0, have:
△vB=Cε·ε (0-7)
Relationship of the formula (0-4) between fibre strain and bending radius, formula (0-7) be optical fiber Brillouin frequency displacement knots modification with
Relationship between strain, the two simultaneous have:
△vB=CεD κ=A κ (0-8)
Brillouin shift can be mapped with curvature；
The Brillouin shift of optical fiber when without bending is first measured as substrate, sensor is then put into arbitrary shape,
The Brillouin shift of optical fiber is measured again, finds out the Brillouin shift knots modification of curved shape everywhere by subtracting substrate；
Then the radius of curvature of bending everywhere is released using formula (0-8), and then recovers corresponding curved shape；
When carrying out shape recovery, used algorithm is circular arc splicing method, and this method, will using the method for segmentation mean value
Shape sensor is divided into several segments, and each section of Brillouin shift knots modification is averaged, and finds out it and corresponds to curvature as this section
Bending curvature, each section in this way of curvature, which can be found out, to be come, we have just obtained the circular arc of one section of one section of equal arc length in this way；
Before circular arc is spliced, the coordinate and its tangential direction of the initial segment endpoint are first selected, is then needed to circular arc
Bending direction is determined, is then connected the tail end of this series of arc the preceding paragraph and next section of head end, tie point
Place keeps tangential direction identical, and this completes the reduction of global shape.
A kind of optical fiber shape sensor-based system of HIGH SENSITIVITY AND HIGH PRECISION, comprising: laser, 50:50 coupler, Polarization Control
Device one, arbitrary-function generator, electrooptic modulator one, EDFA Erbium-Doped Fiber Amplifier, circulator, filter, sensor, photodetection
Device, data collecting card, isolator, electrooptic modulator two, microwave source and Polarization Controller two, the output end of the laser with
The input terminal of 50:50 coupler is connected, two output ends of 50:50 coupler respectively with the input terminal of Polarization Controller one and
The input terminal of Polarization Controller two is connected, and the output end of Polarization Controller one is connected with the input terminal of electrooptic modulator one,
The output end of electrooptic modulator one is connected with the input terminal of EDFA Erbium-Doped Fiber Amplifier, the output end and ring of EDFA Erbium-Doped Fiber Amplifier
The end a of shape device is connected, and the end b of circulator is connected with sensor, the output end and electrooptic modulator two of Polarization Controller two
Input terminal be connected, the output end of electrooptic modulator two is connected with isolator one end, the other end and sensor of isolator
It is connected, arbitrary-function generator is connected with electrooptic modulator one, and microwave source is connected with electrooptic modulator two, data acquisition
Card be connected with one end of photodetector, the other end of photodetector is connected with one end of filter, filter it is another
One end is connected with the end c of circulator.
Beneficial effects of the present invention:
In shape sensing, bending radius is smaller, and the bigger strain the easier to be detected, but bending radius is smaller corresponding
Arc length is with regard to smaller, it is therefore desirable to which raising is spatial resolution in order to avoid lack sampling causes data error excessive.Bending radius is bigger,
It strains and smaller is less susceptible to be detected, it is therefore desirable to improve it to curved susceptibility.The present invention for both of these problems into
Improvement is gone.The present invention acquires data using DPP-BOTDA system, relative to interference sensor, does not need to do optical fiber
Additional processing and processing, optical fiber inherently shape sensor, the step of reducing sensor production, are conducive to later period sensing
Changing the outfit after device damage.FBG is etched on optical fiber compared to FBG type sensor and carries out strain monitoring, and resolution ratio is determined by FBG density
Fixed, once the problem of fixation is difficult to change, and fibre loss increases after etching FBG, the present invention can squeeze into optical fiber by changing
The width of pulse realizes the variation of spatial resolution.Relative to the shape sensing technology based on Brillouin scattering of existing proposition,
Its spatial resolution is high not enough, can not cope with the small situation of certain bending radius, spatial resolution can reach in embodiment
5cm, sensitivity A coefficient are 740.615MHzm, are able to achieve the shape sensing of high spatial resolution, and complete going back for shape
Original weight structure.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the optical fiber shape sensor system of HIGH SENSITIVITY AND HIGH PRECISION of the present invention.
Fig. 2 is differential pulse to raising spatial resolution schematic illustration.
Fig. 3 is bending radius and strain stress relation schematic diagram.
Fig. 4 is the different connecting method schematic diagram of two dimension.
Fig. 5 is that circular arc splices method schematic diagram on two-dimensional surface.
Fig. 6 is a kind of two-dimensional shapes sensor schematic.
Fig. 7 is Frequency Shift when being bent into standard radius of circle.
Fig. 8 is frequency displacement and bending curvature relationship and matched curve figure.
Fig. 9 is experiment real shooting photo.
Figure 10 is that shape tests schematic diagram.
Figure 11 is shape recovery back schematic diagram.
Appended drawing reference in figure, 1 is laser, and 2 be 50:50 coupler, and 3 be Polarization Controller one, and 4 send out for arbitrary function
Raw device, 5 be electrooptic modulator one, and 6 be EDFA Erbium-Doped Fiber Amplifier, and 7 be circulator, and 8 be filter, and 9 be sensor, and 10 be photoelectricity
Detector, 11 be data collecting card, and 12 be isolator, and 13 be V0-V′、V0、V0+ V ' modulation generates lower sideband, and 14 be electric light tune
Device two processed, 15 be microwave source, and 16 be Polarization Controller two, and 17 be pump light, and 18 be detection light.
Specific embodiment
Below in conjunction with attached drawing, the present invention is described in further detail: the present embodiment is being with technical solution of the present invention
Under the premise of implemented, give detailed embodiment, but protection scope of the present invention is not limited to following embodiments.
A kind of measurement method of the optical fiber shape sensor-based system of HIGH SENSITIVITY AND HIGH PRECISION, as shown in Figure 3 and Figure 5.
When optical fiber generates bending, optical fiber side is stretched, and the other side is compressed.It is assumed that fiber core is (curved from neutral axis
Song does not change length, i.e., without strain) distance be respectively d1、d2, strain is respectively ε after bending1、ε2, non-length before bending is L,
Bending radius is R, then:
L1=(1+ ε1)L (0-1)
L2=(1+ ε2)L (0-2)
Geometrical relationship are as follows:
Three equatioies obtain the relationship of strain and bending radius above simultaneous:
κ is curvature in formula, is the inverse of bending radius；
There are Brillouin shift knots modification and temperature, the relational expression for straining knots modification again are as follows:
△vB=CT·△T+Cε·△ε (0-5)
△ v in formulaBFor Brillouin shift knots modification, CTFor Brillouin shift temperature coefficient, △ T is temperature knots modification, CεFor
The Brillouin shift coefficient of strain, △ ε are strain knots modification, and Cong Shizhong finds out, Brillouin shift knots modification is in strain knots modification
Linear relationship obtains when temperature-resistant:
△vB=Cε·△ε (0-6)
There is Brillouin shift knots modification directly proportional to knots modification is strained, if initial strain is 0, have:
△vB=Cε·ε (0-7)
Relationship of the formula (0-4) between fibre strain and bending radius, formula (0-7) be optical fiber Brillouin frequency displacement knots modification with
Relationship between strain, the two simultaneous have:
△vB=CεD κ=A κ (0-8)
Brillouin shift can be mapped with curvature (or bending radius).
In implementation process, it would be desirable to first measure the Brillouin shift of optical fiber when without bending as substrate, then will
Sensor is put into arbitrary shape, then measures to the Brillouin shift of optical fiber, we can be asked by subtracting substrate in this way
The Brillouin shift knots modification of curved shape everywhere out.
Then the radius of curvature of bending everywhere can be released using formula (0-8), and then recovers corresponding curved shape.
When carrying out shape recovery, the algorithm that we use is circular arc splicing method.This method uses the method for segmentation mean value,
Shape sensor is divided into several segments, each section of Brillouin shift knots modification is averaged, and finds out it and corresponds to curvature as the section
Bending curvature, each section in this way of curvature can find out come, so that we have just obtained the circular arc of one section of one section of equal arc length.
Before circular arc is spliced, the coordinate and its tangential direction of the initial segment endpoint are first selected, is then needed to circular arc
Bending direction is determined, is then connected the tail end of this series of arc the preceding paragraph and next section of head end, tie point
Place keeps tangential direction identical, and this completes the reduction of global shape.The schematic diagram of two-dimensional shapes reduction step such as Fig. 5 institute
Show.It should be noted that acquired arc length gets over hour, restore that obtained shape is more accurate, certainly the also essence of original shape
True degree is also related with the spatial resolution of acquisition system.From formula (0-4) if can be seen that fiber core not in shaft core position,
It can be sensitive to bending.Here the shape sensor mentioned is not limited to the dimension sensor in embodiment, including other using it
The sensor or optical fiber structure that it lays off axis.
A kind of optical fiber shape sensor-based system of HIGH SENSITIVITY AND HIGH PRECISION involved in the present embodiment, as shown in Figure 1, comprising:
Laser 1,50:50 coupler 2, Polarization Controller 1, arbitrary-function generator 4, electrooptic modulator 1, erbium-doped fiber amplification
Device 6, circulator 7, filter 8, sensor 9, photodetector 10, data collecting card 11, isolator 12, electrooptic modulator two
14, the output end of microwave source 15 and Polarization Controller 2 16, the laser 1 is connected with the input terminal of 50:50 coupler 2,
Two output ends of 50:50 coupler 2 input terminal phase with the input terminal of Polarization Controller 1 and Polarization Controller 2 16 respectively
Connection, the output end of Polarization Controller 1 are connected with the input terminal of electrooptic modulator 1, the output end of electrooptic modulator 1
It is connected with the input terminal of EDFA Erbium-Doped Fiber Amplifier 6, the output end of EDFA Erbium-Doped Fiber Amplifier 6 is connected with the end a of circulator 7,
The end b of circulator 7 is connected with sensor 9, the input terminal phase of the output end and electrooptic modulator 2 14 of Polarization Controller 2 16
Connection, the output end of electrooptic modulator 2 14 are connected with 12 one end of isolator, and the other end of isolator 12 is connected with sensor 9
It connects, arbitrary-function generator 4 is connected with electrooptic modulator 1, and microwave source 15 is connected with electrooptic modulator 2 14, and data are adopted
Truck 11 is connected with one end of photodetector 10, and the other end of photodetector 10 is connected with one end of filter 8, filter
The other end of wave device 8 is connected with the end c of circulator 7.
The sensor 9 is shape sensor.
The light that laser 1 issues is divided into two beams by 50:50 coupler 2, a branch of to pass through Polarization Controller 1, arbitrarily
Function generator 4 controls electrooptic modulator 1 and is modulated to pulsed light, amplifies by erbium-doped fiber amplifier 6, passes through annular
Device 7 enters shape sensor 9.
Another beam of laser passes through Polarization Controller 2 16, and microwave source 15 controls electrooptic modulator 2 14 and modulated up and down
Side frequency enters shape sensor 9 by isolator 12.
In shape sensor 9, two-way laser interaction is optical fiber Brillouin frequency displacement when two-way laser has difference
Light time generates stimulated Brillouin scattering, scatters light from the port circulator b into the port c goes out, and filters out other through wave filter 8
Light only retains scattered signal light, is detected by photodetector 10, by 11 acquisition and recording of data collecting card.When some position of optical fiber
Set be strained either temperature change when, the Brillouin shift of the position will generate variation.By recording Brillouin shift
Variation, temperature or the knots modification of strain on optical fiber can be obtained.
In a fiber, the corresponding spatial resolution of the optical signal of pulse 10ns is 1m, since Brillouin scattering is in optical fiber
It is generated by acousto-optic interaction, so pulse is influenced by phonon lifetime (~10ns), when light pulse is less than the phonon longevity
When life, interact insufficient, it may occur that Brillouin spectrum broadening, signal-to-noise ratio decline, therefore unconfined can not reduce.And we
Using DPP-BOTDA technology, two pulses are squeezed into optical fiber, respectively obtain two gain signals, and gain signal subtracts each other
Differential pulse can be obtained to time difference corresponding spatial resolution, the influence of phonon lifetime is thus overcome, obtain more
High spatial resolution, we use difference for the pulse pair of 0.5ns, can theoretically obtain the spatial resolution of 5cm.
When optical fiber is generated bending, optical fiber side is stretched, and side is compressed.It is assumed that fiber core is from neutral axis (bending
Do not change length, i.e., without strain) distance be respectively d1、d2, strain is respectively ε after bending1、ε2, non-length before bending is L, curved
Bilge radius is R, then has:
General single mode fiber is insensitive to bending strain, illustrate its neutral axis just at optical fiber axle center, therefore general single mode
Optical fiber can only monitor axial strain, and bending is unable to monitor, it is therefore desirable to do an axis to fiber core and deviate, usually adopt
Optical fiber is exactly pasted on changing object or is utilized multi-core optical fiber by method.Deviate the fibre core of central axis so just to curved
The strain that song generates is monitored, and has multiple fibre cores in multi-core optical fiber not at axle center, just there is one relative to axle center in this way
Offset distance, sensitive to bending, offset distance is remoter, and susceptibility is higher.By being bent to sensor, optical fiber is measured
Brillouin shift, frequency displacement when by stretching with optical fiber compares, so that it may obtain the Brillouin shift on along optical fiber
Knots modification, if multifiber (or multi-core optical fiber) can further eliminate axial strain and temperature on sensor while on cloth
The influence to frequency shift amount is spent, the corresponding frequency shift value of bending strain, frequency shift value and directly proportional, the polarization maintaining optical fibre of strain have thus been obtained
Direct ratio coefficient is 0.0482MHz/ μ ε (Dong Y, Chen L, Bao X.High-Spatial-Resolution Time-
Domain Simultaneous Strain and Temperature Sensor Using Brillouin Scattering
and Birefringence in a Polarization-Maintaining Fiber[J].IEEE Photonics
Technology Letters,2010,22(18):1364-1366).Thus there is Δ νB=A/R=A κ (Δ νBIt is frequency displacement
Amount, A is coefficient, and A is bigger, and the maximum radius being capable of measuring is bigger, and R is radius, and κ is curvature).The coefficient of different optical fiber may slightly have
Difference needs to be calibrated and demarcated by standard round before shape senses, obtains its A coefficient.It is each that we can obtain optical fiber
The strain value at place can calculate its bending radius by strain value, to reconstruct the entire shape of fibre-optical bending.
Restructing algorithm we using circular arc splice method.The strain that circular arc splicing method is measured using system, by sensor
Equal part, then each section of strain value is average, finds out corresponding bending radius under it is uniformly bent, is approximately by the bending of this section
Coordinate and its tangent line side of the initial segment endpoint are selected in the bending (spatial resolution is higher, and error can be smaller) of the bending radius
To, it is end to end by each section, keep tangential direction identical at tie point, then judge next section of bending direction, this
Sample we just complete the reconstruct of entire shape.Two-dimensional shapes sensing on, due to bending direction only there are two (clockwise or
Counterclockwise), therefore its bending direction will be first judged after its equal part, according to different bending directions, determine its connection type
It is different.The judgement of bending direction is similarly carried out in three dimensions.
The foregoing is only a preferred embodiment of the present invention, these specific embodiments are all based on the present invention
Different implementations under general idea, and scope of protection of the present invention is not limited thereto, it is any to be familiar with the art
Technical staff in the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, should all cover of the invention
Within protection scope.Therefore, the scope of protection of the invention shall be subject to the scope of protection specified in the patent claim.
Claims (3)
1. a kind of optical fiber shape sensing measuring method of HIGH SENSITIVITY AND HIGH PRECISION, which is characterized in that
When with certain thickness object generate bending when, side is stretched, and the other side is compressed, it is assumed that thereon fiber core from
The distance of neutral axis is respectively d1, d2, after bending strain be respectively ε1、ε2, non-length before bending be L, bending radius R, then:
L1=(1+ ε1)L (0-1)
L2=(1+ ε2)L (0-2)
Geometrical relationship are as follows:
Three equatioies obtain the relationship of strain and bending radius above simultaneous:
κ is curvature in formula, is the inverse of bending radius；
There are Brillouin shift knots modification and temperature, the relational expression for straining knots modification again are as follows:
△vB=CT·△T+Cε·△ε (0-5)
△ v in formulaBFor Brillouin shift knots modification, CTFor Brillouin shift temperature coefficient, △ T is temperature knots modification, CεFor in cloth
The deep frequency displacement coefficient of strain, △ ε are strain knots modification, and Cong Shizhong finds out, Brillouin shift knots modification and strain knots modification are linear
Relationship obtains when temperature-resistant:
△vB=Cε·△ε (0-6)
There is Brillouin shift knots modification directly proportional to knots modification is strained, if initial strain is 0, have:
△vB=Cε·ε (0-7)
Relationship of the formula (0-4) between fibre strain and bending radius, formula (0-7) are optical fiber Brillouin frequency displacement knots modification and strain
Between relationship, the two simultaneous has:
△vB=CεD κ=A κ (0-8)
Brillouin shift can be mapped with curvature；
When first measuring without bending then sensor is put into arbitrary shape as substrate by the Brillouin shift of optical fiber, then right
The Brillouin shift of optical fiber measures, and finds out the Brillouin shift knots modification of curved shape everywhere by subtracting substrate；Then
The radius of curvature of bending everywhere is released using formula (0-8), and then recovers corresponding curved shape；
When carrying out shape recovery, the algorithm used is circular arc splicing method, and this method is passed shape using the method for segmentation mean value
Sensor is divided into several segments, and each section of Brillouin shift knots modification is averaged, and finds out its bending song for corresponding to curvature as this section
Rate, each section in this way of curvature, which can be found out, to be come, in this way we just obtained the circular arc of one section of one section of equal arc length circular arc into
Before row splicings, the coordinate and its tangential direction of the initial segment endpoint are first selected, then needs to determine the bending direction of circular arc,
Then the tail end of this series of arc the preceding paragraph and next section of head end are connected, tangential direction phase is kept at tie point
Together, this completes the reduction of global shape.
2. the measuring system that a kind of optical fiber shape sensing measuring method of HIGH SENSITIVITY AND HIGH PRECISION described in claim 1 uses,
It is characterised by comprising: laser (1), 50: 50 couplers (2), Polarization Controller one (3), arbitrary-function generator (4), electricity
Optical modulator one (5), EDFA Erbium-Doped Fiber Amplifier (6), circulator (7), filter (8), sensor (9), photodetector (10),
Data collecting card (11), isolator (12), electrooptic modulator two (14), microwave source (15) and Polarization Controller two (16), it is described
The output end of laser (1) is connected with the input terminal of 50:50 coupler (2), two output ends point of 50:50 coupler (2)
It is not connected with the input terminal of the input terminal of Polarization Controller one (3) and Polarization Controller two (16), Polarization Controller one (3)
Output end is connected with the input terminal of electrooptic modulator one (5), the output end and EDFA Erbium-Doped Fiber Amplifier of electrooptic modulator one (5)
(6) input terminal is connected, and the output end of EDFA Erbium-Doped Fiber Amplifier (6) is connected with the end a of circulator (7), circulator (7)
The end b is connected with sensor (9), and the output end of Polarization Controller two (16) is connected with the input terminal of electrooptic modulator two (14)
It connects, the output end of electrooptic modulator two (14) is connected with isolator (12) one end, the other end and sensor of isolator (12)
(9) it is connected, arbitrary-function generator (4) is connected with electrooptic modulator one (5), microwave source (15) and electrooptic modulator two
(14) it is connected, data collecting card (11) is connected with one end of photodetector (10), the other end of photodetector (10)
It is connected with one end of filter (8), the other end of filter (8) is connected with the end c of circulator (7).
3. the measuring system that the optical fiber shape sensing measuring method of HIGH SENSITIVITY AND HIGH PRECISION as claimed in claim 2 uses, special
Sign is that the sensor (9) is shape sensor.
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| CN108344432B (en) * | 2018-02-07 | 2019-08-06 | 北京交通大学 | The method for obtaining the heat transfer agent of Brillouin fiber optic distributed sensing system |
| CN111189483A (en) * | 2018-11-14 | 2020-05-22 | 中兴通讯股份有限公司 | Distributed optical fiber sensing system, control method and control device thereof, and storage medium |
| CN110511569B (en) | 2019-07-25 | 2021-06-04 | 复旦大学 | Ultra-sensitivity pressure sensing film based on barbed hollow carbon microspheres and preparation method thereof |
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