CN109141292A - A kind of fibre cladding SPR microbend sensor and its caliberating device - Google Patents
A kind of fibre cladding SPR microbend sensor and its caliberating device Download PDFInfo
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- CN109141292A CN109141292A CN201811074656.2A CN201811074656A CN109141292A CN 109141292 A CN109141292 A CN 109141292A CN 201811074656 A CN201811074656 A CN 201811074656A CN 109141292 A CN109141292 A CN 109141292A
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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
- G01B11/255—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring radius of curvature
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Abstract
The invention belongs to sensory field of optic fibre, relating generally to a kind of fibre cladding SPR microbend sensor and its caliberating device, fibre cladding SPR microbend sensor proposed by the invention reduces the manufacture difficulty and cost of manufacture of optical fiber SPR sensor；Innovative proposition simultaneously demonstrates the measurement that bending curvature is realized using SPR effect, has expanded the research field of traditional fiber type microbend sensor to a certain extent.And the present invention has a clear superiority in landslide disaster monitoring, the present invention is embedded to major landslide disaster to take place frequently a little, miniature deformation once occurs for earth's surface, pass through the depth and displacement of SPR formant on observation spectrometer, it can speculate landslide intensity, reach the monitoring to landslide disaster, therefore the present invention has wide application value.
Description
Technical field
The invention belongs to sensory field of optic fibre, it is related to a kind of fibre cladding SPR microbend sensor and its caliberating device.
Background technique
Curvature Optical Fiber Sensor has caused the wide hair of researcher due to having a large amount of application in flexural measurement field
Concern.Flexural measurement technology all has quite in fields such as geophysics, aerospace, machinery and various building structure health monitorings
For important meaning.Because the state of mechanical construction, heavy construction and stress parameters have direct relationship with bending,
A kind of indirect means of element mechanics condition is obtained when to measure to bending；It is built in large sizes such as bridge, house and rails
In building structure, the oil gas such as large oil tank, natural gas and gasoline transport pipeline storage and transporting equipment in, in rocket, large size
In the military equipments such as guided missile and large-scale precision firearms, in the vehicles such as automobile, train and railway, landslide,
In the natural disasters such as dam collapsing and earth subsidence, the curvature of structure and landform Bending Deformation is a very important parameter, the parameter
Damage and failure with structure and landform, which have, directly to be contacted.
Fibre optical sensor is because its high sensitivity, small in size, easy of integration, electromagnetism interference and resistance to corrosion are strong, transmission damage
The features such as consuming small, light-weight, low cost, be easy to be embedded to monitoring of structures and carrying out to transmitter networking, therefore, is widely used in intelligence
It can artificial limb and the isostructural Bending Deformation detection of heavy construction.
Currently, optical fibre bending sensor mainly includes three types: (1) light based on power coupling or power attenuation principle
Fine bending sensor, (2) fibre optic interferometer type bending sensor, (3) fiber grating bending sensor.(1) it is coupled based on power
Or the optical fibre bending sensor of power attenuation principle: it is traditionally used for the optical fiber of the intensity modulation type fibre optical sensor of curvature measurement
Surface free crosses processing, is made only with the principle that intensity loss of the optical fiber in deep camber macrobend increases suddenly, therefore,
Sensitivity is very low；And for (2) fibre optic interferometer type bending sensor of current most study and (3) fiber grating crooked sensory
Device belongs to interference-type optical fiber curvature sensor, has small in size, the advantages such as demodulation techniques mature.But such sensing
Device is mostly sensitive not only for bending, and also sensitive simultaneously for axial strain and temperature.It is past during crooked sensory
Toward meeting simultaneously by effects such as axial strain and temperature, and many such bending sensors can not imitate axial strain
It answers, temperature influences and curvature effect distinguishes, the influence curvature measurement of cross sensitivity problem.
The reason of strain causes interference-type (interferometer class or grating class) optical fiber sensing wavelength to drift about is elasto-optical effect and indulges
To telescopic grid away from/interference brachium.The reason of temperature causes interference-type (interferometer class or grating class) optical fiber sensing wavelength to drift about master
It will be from three aspects: light efficiency is played caused by optical fiber thermal expansion effects, optical fiber thermo-optic effect and inside of optical fibre thermal stress
It answers.
Optical fiber surface plasmon resonance body (SPR) sensor has high-sensitivity characteristic, has been successfully used in rolling over liquid
Penetrate the sensory field of rate.For wavelength modulation type optical fiber SPR sensor, the paddy depth that resonates and resonant wavelength will receive evanscent field
The influence of intensity, incident light angle, substrate refractive index, external environment refractive index, the several factors of golden film thin-film dielectric constant, and it is warm
Degree and strain change factors above will not all be impacted substantially, or caused by influence and SPR superelevation sensitivity phase
Than being negligible.
For the rare carry out curvature sensing of optical fiber SPR sensor, spr sensor is not easy to realize two large problems.The present invention mentions
A kind of novel simply fibre cladding SPR curvature sensor based on core shift welding technique out, avoids other interference-type optical fibers
The problems such as sensitivity existing for bending sensor is lower, strain and temperature can generate cross jamming when measuring curvature.Existing light
Fine microbend sensor mainly has two major classes, grating type optical fiber microbend sensor and optical fiber interference type microbend sensor.Light
Fine grating type microbend sensor Bending Sensitivity is high, and bending curvature measurement range is wide, there is very strong bending direction.But
Expensive laser and mask plate are needed during this sensor production, need complicated preparation process；Optical fiber interference type is micro-
Bending sensor is mainly Mach Zehnder interferometer type, and this sensor production is simple, and mechanical strength is good, but resolution ratio compared with
Low, sensitivity is not high.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of fibre cladding surface plasmas based on core shift welding technique
Resonance body (SPR) microbend sensor, can be widely used for the monitoring of the geological disasters such as landslide, mud-rock flow；And provide this kind biography
The caliberating device of sensor and the application method of the device.The present invention is compared with existing fiber microbend sensor: production is simple, at
This is cheap, does not need expensive optical-fiber processing equipment.
In order to achieve the above objectives, the invention provides the following technical scheme:
A kind of fibre cladding SPR microbend sensor, including note light optical fiber, sensor fibre and receipts light optical fiber；The note
Light optical fiber is for receiving and transmitting input light；Metallic film is wrapped up on the outside of the sensor fibre, input light is in covering and metal foil
Membrane interface is totally reflected, and evanscent field leaks in metallic film and occur SPR phenomenon, and optical signal is transmitted to again receives light optical fiber；
The receipts light optical fiber is for receiving and transmitting output light；When sensor fibre is bent, it is total to receive the received output light SPR spectroscopy of light optical fiber
Vibration paddy depth changes with resonance paddy wavelength, and the bending curvature of sensor fibre is embodied by the variation of reflectance spectrum.
Optionally, the note light optical fiber is that core shift is connect with the junction of the sensor fibre, and sensor fibre cuts at this
Projection of the face geometric center on the section of note light optical fiber and the geometric center intersection of note light fiber cross-sections are zero.
Optionally, spin coating ultra-violet curing glue-line on the outside of the metallic film.
Optionally, the ultra-violet curing glue-line is ultralow folding uv-curable glue；The metallic film with a thickness of 40-
60nm, the refractive index of the ultra-violet curing glue-line are 1.34-1.36RIU.
A kind of caliberating device of fibre cladding SPR microbend sensor, including for fixing fibre cladding SPR microbend biography
The fixed plate of sensor, the microscope for observing fibre cladding SPR microbend sensor, for providing input light for sensor fibre
Light source, for detect receive light optical fiber output light spectrometer and for sensor fibre force cause its curved micro- behaviour's hand and
Micro- behaviour's hand controls；The fibre cladding SPR microbend sensor is arranged in fixed plate, and sensor fibre is exposed；It is described aobvious
Micro mirror shows the state of fibre cladding SPR microbend sensor in fixed plate；Light source with note light optical fiber be connected, spectrometer with receipts light
Optical fiber is connected.
Optionally, further include folding table for adjusting manipulator's height.
Optionally, further include station for placing fixed plate, the height of the station is adjustable.
Optionally, the fixed plate includes bottom plate and is arranged at intervals on two ipsilateral open tubular columns of bottom plate, and two hollow
Gap between column is for placing sensor fibre.
A kind of application method of the caliberating device of fibre cladding SPR microbend sensor, comprising the following steps:
Fibre cladding SPR microbend sensor is fixed in fixed plate by S1；
Fixed plate is fixed on microscope carrier by S2, and adjusts microscope ocular, passes fibre cladding SPR microbend
The sensor fibre of sensor is shown in the visual field of microscope ocular；
S3 makes sensor fibre bend displacement using micro- behaviour's hand, every to generate certain bending displacement, is just remembered using spectrometer
Record primary event spectrum, preservative reflex spectroscopic data.
It optionally, further include S4；
S4 is handled reflectance spectrum using software, obtains test curve.
The beneficial effects of the present invention are:
It invention can be widely used in the monitoring of the geological disasters such as landslide, mud-rock flow.This optical-fiber type microbend sensor phase
Than in conventional electrical, mechanics sensor have small in size, compact-sized, high sensitivity, electromagnetism interference, can remote monitoring etc.
Many advantages；Have production simple compared to traditional fiber type microbend sensor, low in cost, the advantages such as structure is simple are full
Sufficient fibre optical sensor is integrated, minimizes, low cost, highly sensitive development trend.
Fibre cladding SPR microbend sensor proposed by the invention allows light in fibre cladding using core shift welding technique
Middle transmission a small distance, when light transmits in fibre cladding, evanscent field is readily leaked in air, without removing optical fiber packet
Layer, has been solved perfectly the problem of optical-fiber type spr sensor processing and fabricating difficulty；At this moment metal foil is coated with outside fibre cladding
Film, generally golden film can use common optical fiber, and novel optical fiber SPR sensor is constructed with simplest structure and thinking, solution
Certainly traditional fiber spr sensor processing and fabricating is difficult, evanescent wave is not easy to obtain, problem with high costs.By being passed in covering SPR
The ultralow folding uv-curable glue of spin coating outside sensor constitutes the fibre cladding SPR curvature sensor of golden film cladding, when sensor fibre is curved
Qu Shi, bending will lead to sensor fibre covering leakage evanescent field strength and increase, and also result in transmission optical mode, i.e., transmission ray with
The outer golden film included angle of covering changes, and then SPR curve resonance paddy depth is caused to increase, with resonant wavelength red shift.Innovation
Property proposition and demonstrate using SPR effect realize bending curvature measurement, avoid other interference-type optical fiber bending sensors
The problems such as existing sensitivity is lower, strain and temperature can generate cross jamming when measure curvature, to a certain extent expansion
The research field of traditional fiber type microbend sensor.And the present invention has a clear superiority in landslide disaster monitoring, incite somebody to action this
Invention is embedded to major landslide disaster and takes place frequently a little, and miniature deformation once occurs for earth's surface, passes through the depth of SPR formant on observation spectrometer
Degree and displacement, can speculate landslide intensity, reach the monitoring to landslide disaster, therefore the present invention applies valence with wide
Value.
Meanwhile fibre-optical bending curvature measurement device according to the present invention, simple and practical, precision is high, and it is reproducible, it can be big
Amount is promoted.
Other advantages, target and feature of the invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.Target of the invention and other advantages can be realized by following specification and
It obtains.
Detailed description of the invention
To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is made below in conjunction with attached drawing excellent
The detailed description of choosing, in which:
Fig. 1 is the overall structure diagram of fibre cladding SPR microbend sensor involved in the present invention；
Fig. 2 is the overall structure diagram of the caliberating device of fibre cladding SPR microbend sensor involved in the present invention；
Fig. 3 is involved in the present invention for fixing the fixed plate of fibre cladding SPR microbend sensor；
Fig. 4 is the test curve of fibre cladding SPR microbend sensor involved in the present invention
Fig. 4 (a) SPR curve resonance paddy depth increases with curvature and is increased；
Fig. 4 (b) is that normalized SPR curve, SPR resonant wavelength are mobile with Curvature varying again.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that diagram provided in following embodiment is only to show
Meaning mode illustrates basic conception of the invention, and in the absence of conflict, the feature in following embodiment and embodiment can phase
Mutually combination.
Wherein, the drawings are for illustrative purposes only and are merely schematic diagrams, rather than pictorial diagram, should not be understood as to this
The limitation of invention；Embodiment in order to better illustrate the present invention, the certain components of attached drawing have omission, zoom in or out, not
Represent the size of actual product；It will be understood by those skilled in the art that certain known features and its explanation may be omitted and be in attached drawing
It is understood that.
The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention；It is retouched in of the invention
In stating, it is to be understood that if there is the orientation or positional relationship of the instructions such as term " on ", "lower", "left", "right", "front", "rear"
To be based on the orientation or positional relationship shown in the drawings, be merely for convenience of description of the present invention and simplification of the description, rather than indicate or
It implies that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore is described in attached drawing
The term of positional relationship only for illustration, is not considered as limiting the invention, for the ordinary skill of this field
For personnel, the concrete meaning of above-mentioned term can be understood as the case may be.
Fig. 1-Fig. 4 is please referred to, the element numbers in attached drawing respectively indicate: light source 1, note light optical fiber 2, sensor fibre 3, metal
Film 3-1, ultralow folding ultra-violet curing glue-line 3-2, it receives light optical fiber 4, is spectrometer 5, fixed plate 6, open tubular column 6-1, microscope 7, micro-
Grasp hand 8, micro- behaviour's hand controls 9.
The present invention relates to a kind of fibre cladding SPR microbend sensor, sensing principles are as follows: 1 light of light source is by note light light
When fibre 2 reaches core shift fusion point, due to core shift welding, light can be full of the covering of entire sensor fibre 3 immediately, and transmission light arrives
When up to covering with the interface metallic film 3-1, it may occur that total reflection, and there is evanescent wave to penetrate into metallic film 3-1, it can occur
SPR effect achievees the effect that SPR occurs using fibre cladding.The ultralow folding ultra-violet curing of spin coating outside 3 golden film of sensor fibre
Glue, when bending for 3 sections of sensor fibre, radius of curvature is bigger, is coupled into the transmission light of 3 sections of coverings of sensor fibre from covering
It leaking out more, the evanscent field at covering and the interface metallic film 3-1 constantly enhances as radius of curvature increases, and SPR effect enhances,
SPR resonance paddy depth is caused constantly to be deepened.Simultaneously as the bending of sensor fibre 3, the folder of transmission ray and metallic film 3-1
Minor change also occurs for angle angle, and SPR resonance paddy wavelength is caused also to move.
A kind of fibre cladding SPR microbend sensor based on core shift welding technique proposed by the present invention is mainly by three parts
It constitutes, respectively note light optical fiber 2, sensor fibre 3, receipts light optical fiber 4.Wherein, note light optical fiber 2 is common single mode optical fiber, fibre core
Diameter is 9 μm, and cladding diameter is 125 μm, and length is 1m or so；Sensor fibre 3 can be 9 μm/125 single mode optical fibers, 40/125-
22/250 step multimode fibre, three kinds of 50/125-20/250 gradual change multimode fibre, 3 length of sensor fibre are 2cm, and surface is splashed
It penetrates and is coated with one layer of 50nm golden film, and the ultralow folding uv-curable glue (refractive index 1.34RIU) of spin coating on the outside of golden film；Receive light optical fiber
4 be 105/125-22/250 step multimode fibre, length 0.5m.
Specific connection type are as follows: single mode infuses 2 one end of light optical fiber and is connected to 1 output end of light source by FC mouthfuls of naked fibre adapters,
The other end connects sensor fibre 3；The plating of 3 surface of sensor fibre is formed with one layer of 50nm golden film, and the ultralow folding of spin coating is purple on the outside of golden film
Light optical fiber 4 is received in outer solidification glue (refractive index 1.34RIU), the connection of 3 other end of sensor fibre；It receives 4 other end of light optical fiber and passes through FC
Mouth naked fibre adapter is connected to 5 input terminal of spectrometer.
Light source 1 according to the present invention is super continuum source 1 (SuperK COMPACT), wave-length coverage 500-
2400nm, output power 100mW；Related note light optical fiber 2 is used for transmission 1 light of light source, is single mode optical fiber；Related biography
Photosensitive fine 3 be the sensing unit of sensor, for sensing extraneous Curvature varying；Related receipts light optical fiber 4 is for receiving through sensing
Reflection loss light after area's effect, and by optical transport to spectrometer 5；Related spectrometer 5 is Yokogawa AQ6373B spectrometer 5,
Wave-length coverage covers 350-1200nm, wavelength resolution 0.02-10nm, and wavelength accuracy is ± 0.05nm, for being transmitted back to
The light come carries out spectra collection and demodulation.
A kind of caliberating device of fibre cladding SPR microbend sensor involved in the present invention, specific operation side
Method is as follows: the one end for infusing light optical fiber 2 penetrated into the one of open tubular column 6-1 of fixed plate 6, and is pierced by from another open tubular column 6-1,
Its sensor fibre 3 is completely exposed on bottom plate；Fixed plate 6 is then fixed on to using 7 card slot of microscope the loading of microscope 7
On platform, micro- behaviour's hand 8 is adjusted, its tip is made to be located at the center of sensor fibre 3 but not sensing contact optical fiber 3；Then note light optical fiber 2 is connected
Light source 1 receives the connection spectrometer 5 of light optical fiber 4.When measurement, the test solution drop that refractive index is 1.340 is drawn with rubber head dropper and is being passed
On photosensitive fine 3 region, it is completely covered；Manipulator is adjusted, its nib contacts sensor fibre 3 is made and generates sensor fibre 3
Bending displacement, every bending displacement for generating 1mm just acquire primary event spectrum in spectrometer 5 and stop after acquiring ten spectrum
It only acquires, spectroscopic data collected is handled in MATLAB software, obtains final test curve.Before the procedure and
In operating process, can also the height as the case may be to manipulator and microscope 7 be adjusted.
According to experiment results, sensor SPR formant half-peak breadth proposed by the invention be 55nm, when curvature from
0m-1Change to 51.095m-1When, SPR curve resonance paddy depth changes to 0.42, SPR resonant wavelength from 567.63nm from 0.22
Change to 603.39nm.And the present invention also has certain advantage on the Geological Hazards Monitorings such as landslide, mud-rock flow.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of the technical program, should all be covered in the present invention
Scope of the claims in.
Claims (10)
1. a kind of fibre cladding SPR microbend sensor, which is characterized in that
Including note light optical fiber, sensor fibre and receive light optical fiber；
The note light optical fiber is for receiving and transmitting input light；
Metallic film is wrapped up on the outside of the sensor fibre, input light is totally reflected in covering and metallic film interface, evanscent field
SPR phenomenon is leaked in metallic film and occurs, optical signal is transmitted to again receives light optical fiber；
The receipts light optical fiber is for receiving and transmitting output light；
When sensor fibre is bent, receives the received output light SPR spectroscopy resonance paddy depth of light optical fiber and changes with resonance paddy wavelength,
The bending curvature of sensor fibre is embodied by the variation of reflectance spectrum.
2. fibre cladding SPR microbend sensor as described in claim 1, it is characterised in that: the note light optical fiber and institute
It states the junction of sensor fibre to connect for core shift, throwing of the cross section geometric center of sensor fibre on the section of note light optical fiber at this
The geometric center intersection of shadow and note light fiber cross-sections is zero.
3. fibre cladding SPR microbend sensor as described in claim 1, it is characterised in that: on the outside of the metallic film
Spin coating ultra-violet curing glue-line.
4. fibre cladding SPR microbend sensor as described in claim 3, it is characterised in that: the ultra-violet curing glue-line
For ultralow folding uv-curable glue；The metallic film with a thickness of 40-60nm, the refractive index of the ultra-violet curing glue-line is
1.34-1.36RIU。
5. a kind of caliberating device of fibre cladding SPR microbend sensor, it is characterised in that: including for fixing fibre cladding
The fixed plate of SPR microbend sensor, the microscope for observing fibre cladding SPR microbend sensor are used to be sense light
Fibre provides the light source of input light, causes its curved for detecting to receive the spectrometer of light optical fiber output light and exert a force for sensor fibre
Bent micro- behaviour's hand and micro- behaviour's hand controls；The fibre cladding SPR microbend sensor is arranged in fixed plate, and sensor fibre
It is exposed；The microscope shows the state of fibre cladding SPR microbend sensor in fixed plate；Light source with note light optical fiber be connected,
Spectrometer is connected with light optical fiber is received.
6. the caliberating device of fibre cladding SPR microbend sensor as described in claim 5, it is characterised in that: further include
For adjusting the folding table of manipulator's height.
7. the caliberating device of fibre cladding SPR microbend sensor as described in claim 5, it is characterised in that: further include
For placing the station of fixed plate, the height of the station is adjustable.
8. the caliberating device of fibre cladding SPR microbend sensor as described in claim 5, it is characterised in that: described solid
Fixed board includes bottom plate and is arranged at intervals on two ipsilateral open tubular columns of bottom plate, and the gap between two open tubular columns is passed for placing
Photosensitive fibre.
9. a kind of use of the caliberating device of the fibre cladding SPR microbend sensor as described in any one of claim 3~8
Method, which comprises the following steps:
Fibre cladding SPR microbend sensor is fixed in fixed plate by S1；
Fixed plate is fixed on microscope carrier by S2, and adjusts microscope ocular, senses fibre cladding SPR microbend
The sensor fibre of device is shown in the visual field of microscope ocular；
S3 makes sensor fibre bend displacement using micro- behaviour's hand, every to generate certain bending displacement, just using spectrometer record one
Secondary reflection spectrum, preservative reflex spectroscopic data.
10. the application method of the caliberating device of fibre cladding SPR microbend sensor as described in claim 9, feature
It is, further includes S4；
S4 is handled reflectance spectrum using software, obtains test curve.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112604925A (en) * | 2020-12-08 | 2021-04-06 | 哈尔滨工业大学 | Manufacturing method and film coating method based on hollow optical fiber light field resonance structure |
| CN113132585A (en) * | 2020-01-10 | 2021-07-16 | 宁波舜宇光电信息有限公司 | Photosensitive chip assembly, mobile terminal, camera module and preparation method thereof |
| CN113310411A (en) * | 2021-05-27 | 2021-08-27 | 重庆三峡学院 | Arc end surface coaxial double-waveguide optical fiber two-dimensional displacement sensor and manufacturing method thereof |
| CN113310507A (en) * | 2021-05-27 | 2021-08-27 | 重庆三峡学院 | Optical fiber SPR sensor for measuring displacement and angle, calibration device and method |
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