CN108801156A - A kind of plastic optical fiber displacement sensor and preparation method thereof - Google Patents
A kind of plastic optical fiber displacement sensor and preparation method thereof Download PDFInfo
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- CN108801156A CN108801156A CN201810802189.4A CN201810802189A CN108801156A CN 108801156 A CN108801156 A CN 108801156A CN 201810802189 A CN201810802189 A CN 201810802189A CN 108801156 A CN108801156 A CN 108801156A
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- optical fiber
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- groove structure
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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
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
Abstract
A kind of macrobending poly-V groove structural plastic optical fibre displacement sensor, belongs to technical field of optical fiber sensing.It is made of plastic optical fiber displacement sensing probe, Displacement-deformation device and the photoelectric detection system etc. of light source, macrobending poly-V groove structure.The plastic optical fiber displacement sensing probe of poly-V groove structure is prepared using molded method.The present invention is to cause the variation of fibre-optical probe bending loss to be sensed using displacement.V-shaped groove structure can effectively improve sensing sensitivity.The complete all-fiber of the displacement sensor, and have many advantages, such as simple in structure, easy to make, of low cost.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, and in particular to a kind of plastic optical fiber position of macrobending poly-V groove structure
Displacement sensor.
Background technology
Displacement measuring technology has significant application value in the fields such as Industry Control and monitoring structural health conditions.Some other object
Reason amount, such as strain, pressure or acceleration etc. can indirectly be obtained by the measurement of displacement.Traditional displacement sensor
Include mainly resistance-type, condenser type and magneto-electric etc., these sensors are highly susceptible to the dry of electromagnetic environment in practical applications
It disturbs.In contrast, optical fibre displacement sensor then have anti-electromagnetic interference capability is strong, electrical insulating property is good, corrosion-resistant, flexibility is high,
The advantages that small, is suitably applied in inflammable and explosive and some relatively rugged environments, therefore increasingly by researcher
Concern.The optical fibre displacement sensor reported at present has displacement sensor based on fiber grating, is based on Fabry-Perot Luo Gan
The displacement sensor of interferometer and displacement sensor etc. based on Optical Fiber Michelson Interferometer.But the preparation of these displacement sensors
Technics comparing is complicated, and the mode of generally use wavelength modulation, needs to be demodulated using the more expensive spectrometer of price,
Testing cost is also relatively high.
Therefore, many researchers devise the optical fibre displacement sensor of intensity modulation type as a kind of cheap in recent years
Sense solution.As Application Number (patent) CN201510229468.2, Authorization Notice No. CN105043264B " are based on macrobending
The coupling effect between two macrobend optical fibers is utilized to realize displacement sensing in the optical fibre displacement sensor of loss effect ", but
It is that coupling efficiency between two bare fibres is very low, causes the optical signal that coupling exports very weak, to make the signal-to-noise ratio of sensor
It is very poor.Such as application number 201410324880.8, " optical fibre displacement sensor, fiber optics displacement detection device and sensor optical fiber " profit
The light energy generated with curved fiber is lost to realize displacement sensing, but the sensor does not provide the preparation of optical fiber sensing probe
Method, and the fibre-optical probe is difficult the original state that then returns to after bending, and structural stability is repeated with measurement
Property is poor.
Invention content
The purpose of the present invention is to provide a kind of simple in structure, preparations conveniently, low-cost macrobending poly-V groove structure
Plastic optical fiber displacement sensor and preparation method thereof.The sensor is the change for causing bending loss of optical fiber using the variation of displacement
Change to realize that displacement sensing, V-shaped groove structure can effectively improve the size of the bending loss caused by displacement, so as to carry
High sensing sensitivity.The sensor output signal is stronger, and signal-to-noise ratio is high, and the plastic optical fiber by that will carry V-shaped groove structure
Probe is wrapped on a hollow Elastic Cylindrical body, can also effectively improve the structural stability and repeatability of sensor.
A kind of plastic optical fiber displacement sensor of macrobending poly-V groove structure, by light source, the plastics of poly-V groove structure
The compositions such as fibre-optical probe, cylinder type hollow elastomer, Displacement-deformation device, photoelectric detection system.The poly-V groove structure is
It is prepared on plastic optical fiber using molded method.The specific preparation process of optical fiber sensing probe is as follows：
1) plastic optical fiber is placed under the steel with U-shaped groove structure in mold, then by the steel with poly-V groove structure
Molding jig is placed in above plastic optical fiber, makes the axially vertical of V-shaped groove structure and optical fiber, can be with by applying pressure to upper mold
Optical fiber is set to deform upon, to which multiple V-shaped groove structures can be formed in central axial along plastic optical fiber.The preparation method is very
Flexibly, the depth of V-shaped groove structure can be changed by changing pressure size, by using with different V-shaped groove structure spacing,
The mold of angle and quantity can prepare the V-shaped groove of Different structural parameters on plastic optical fiber.
2) plastic optical fiber with V-shaped groove structure prepared is wrapped on a hollow Elastic Cylindrical body, and
Make the direction that V-shaped groove structure facing away from elastomer outwardly, just constitutes method using in optic fiber displacement sensor probe.By using different-diameter
Cylinder type hollow elastomer can then change the macrobend bilge radius of optical fiber sensing probe.
The plastic optical fiber is multimode commercial plastic optical fiber, and core material is generally by PMMA (poly-methyl methacrylates
Ester), the materials such as polystyrene (PS) or makrolon (PC) constitute, covering is generally made of materials such as PMMA and fluoroplastics.
The outer diameter of optical fiber is 250~1500 μm, ranging from 240~1480 μm of core diameter.
The depth of the plastic optical fiber poly-V groove structure is 50~500 μm, and between cog spacing is 1~5mm, poly-V groove knot
The quantity of structure is 1~20, and the angle of V-shaped groove structure is 20~150 °.The bending of the plastic optical fiber displacement sensing probe
Radius is 5~40mm.
The cylinder type hollow elastomeric material is rubber, and hardness need to be less than the hardness of plastic optical fiber material, to keep away
The cross section of optical fiber deforms upon when exempting from change in displacement, and the thickness of the hollow elastomer is 5~20mm.
The Displacement-deformation device includes a fixed steel plate and a moveable steel plate.The Fibre Optical Sensor
Probe is placed between two steel plates, the macrobend bilge radius of optical fiber sensing probe can be made to change by moving steel plate.
The light source of the sensor can be the semiconductor laser that launch wavelength is 650nm or centre wavelength is
The red-light LED of 650nm；The photoelectric detection system is photodiode.
The present invention is to realize displacement sensing using the bending loss effect of optical fiber.Optical fiber in the case of bending,
The pattern transmitted in fibre core can be deviated to bending side, and the low order guided mode transmitted in fibre core is made to be converted into high-order mode or covering
Mould, or even be radiated other than optical fiber, to generate macrobend loss.Loss value between different mode be it is different, for
The loss α of step optical fiber, higher order mode can be expressed as (Bending loss in multimode fibers with
Graded and ungraded core index, Applied Optics, 11 (11), 1972),
Wherein, n is fiber core refractive index, and k is propagation constant, θcFor critical angle, R is radius of curvature, and a is core diameter, and θ is
The angle of transmission ray and shaft axis of optic fibre.Total macrobend loss y can be expressed as in step optical fiber,
Y=a/R Δs
In formula, Δ is the refringence of fibre core and covering.It can be seen that change of total bending loss with macrobend bilge radius
Change and changes.The displacement sensor is exactly the macrobending radius size for changing fibre-optical probe by the variation of displacement, from
And the output intensity of fibre-optical probe is made to change.So being obtained with displacement by the variation for monitoring sensor output intensity
The variation of amount.And the structure of poly-V groove can make more guided modes in fibre core be converted into cladding mode or radiation mode, to make light
It is become readily apparent from the variation of displacement by force, that is, improves the sensitivity of sensor.
Compared with prior art, the plastic optical fiber displacement sensor of macrobending poly-V groove structure of the invention has as follows
Advantage：
1) method using in optic fiber displacement sensor of the invention probe is prepared using plastic optical fiber at low cost, flexibility is good, used
Press molding method has preparation process simple, cheap, convenient for advantages such as commercial productions.
2) the V-shaped groove structure of method using in optic fiber displacement sensor of the invention probe can improve displacement sensing sensitivity, and by its
It is wrapped on cylindrical elastomer, the structural stability and repeatability of sensor can be improved well.
3) displacement sensor of the invention uses semiconductor laser as light source, cheap；It is counted as using luminous power
It is at low cost for detector, convenient for integrated.
Description of the drawings
Fig. 1 is the structural schematic diagram of the poly-V groove structural plastic fibre optical sensor of the present invention；
Fig. 2 is the preparation method schematic diagram of the poly-V groove structural plastic optical fiber of the present invention；
Fig. 3 is the structural parameters schematic diagram of the poly-V groove structural plastic optical fiber of the present invention；
Fig. 4 is the response curve of the poly-V groove structural plastic fibre optical sensor of the present invention；
Fig. 5 is the reperformance test curve of the poly-V groove structural plastic fibre optical sensor of the present invention；
Fig. 6 is the lagging characteristics test curve of the poly-V groove structural plastic fibre optical sensor of the present invention.
Specific implementation mode
In order to make objects and advantages of the present invention be more clearly understood, the specific implementation of the present invention is made below in conjunction with the accompanying drawings
Further to be described in detail but of the invention implementation and protection domain is without being limited thereto, identical to present invention work essence equally to replace
It changes and all belongs to the scope of protection of the present invention.
Referring to Fig. 1, macrobending poly-V groove structural plastic optical fibre displacement sensor of the invention is by center emission wavelength
LED light source 1, macrobending poly-V groove structural plastic fibre-optical probe 2, hollow elastomer 3, Displacement-deformation device 4 and the light of 650nm
Power meters 5 etc. form.Displacement-deformation device determines steel plate 6 and a removable steel plate 7 comprising one.Modeling with V-shaped groove structure
Optical Fiber Winding is expected on a hollow elastomer, and V-shaped groove structure facing away from the direction of elastomer outwardly.By using not
With the elastomer of diameter, thus it is possible to vary the macrobend bilge radius of optical fiber sensing probe.Preferably, Elastic Cylindrical body is a diameter of
40mm, thickness 5mm.When work, sensing probe 2 is reached by optical fiber by the light that light source 1 is sent out, when Displacement-deformation device
When removable steel plate 7 occurs mobile, hollow cylinder elastomer 3 can be caused to deform upon, that is, cause the curved of optical fiber sensing probe 2
Bilge radius changes, and to make the optical signal of transmission change, the light intensity signal modulated can be by by light power meter 5
It measures.Variation due to being tested displacement can cause output intensity to change, and be become with tested displacement by demarcating light intensity
The response curve of change, so that it may to obtain the relation curve between them, using this relation curve, by monitoring output intensity
Size can be obtained by the size of tested displacement.Due to the effect of elastomer, when removable steel plate 7 returns to original position
When, fibre-optical probe can also be restored to original state, so the structural stability and repeatability of the sensor are preferable.
Referring to Fig. 2, plastic optical fiber used by the present embodiment is multimode commercial plastic optical fiber, core material PMMA,
Refractive index is 1.49, and clad material is PMMA and fluoroplastics, refractive index 1.41.The outer diameter of optical fiber is 1000 ± 2 μm, core diameter
It is 980 ± 2 μm.Poly-V groove structure can be prepared on plastic optical fiber using the method for compression molding.Specific preparation method
For：Plastic optical fiber 8 is placed under the steel with U-shaped groove structure in mold 9, it then will be on the steel with poly-V groove structure
Mold 10 is placed in the top of plastic optical fiber, and makes the axially vertical of V-shaped groove structure and optical fiber, by applying pressure to upper mold,
Optical fiber is set to deform upon, to be upwardly formed multiple V-shaped groove structures in the central shaft along plastic optical fiber.The preparation method is very clever
It is living, the depth of V-shaped groove structure can be changed by changing pressure size, by using with different spacing, angle and quantity
V-shaped groove mold the V-shaped grooves of Different structural parameters can be prepared on plastic optical fiber.Referring to Fig. 3, for more V of the present invention
The structural parameters schematic diagram of shape slot structure plastic optical fiber.Wherein L is the length of poly-V groove structure, and d is the depth of V-shaped groove structure,
α is the angle of V-shaped groove structure, and p is the spacing of poly-V groove structure.Preferably, the depth of poly-V groove structure is 200 μm, angle
It it is 60 °, number is 12, and spacing is 2mm between slot.
It is displacement-Intensity response curve of the poly-V groove structural plastic optical fibre displacement sensor of the present invention referring to Fig. 4, it should
Curve is obtained from being averaged as multigroup experimental data.As can be seen that as (macrobend bilge radius subtracts for the increase of displacement
It is small), output intensity reduces.The sensitivity S of sensor can be calculated by following formula,
S=Δ P/ Δs L
In formula, Δ P is the variable quantity of sensor output intensity, and Δ L is the variable quantity of tested displacement.It can obtain, the light
The sensitivity of fine displacement sensor is 3.24 μ W/mm.The R of matched curve2Value is 0.9982.
In practical application, when such as detecting the displacement of a certain building, need to determine Interal fixation on object of reference,
By removable Interal fixation on tested building.When building is subjected to displacement, optical fiber can be made to pass by removable steel plate
The bending radius of sense probe changes, and to which the output intensity for making light power meter detect generates variation, therefore passes through reading
The numerical value of luminous power, so that it may to obtain the displacement of building.
Referring to Fig. 5, for displacement-light of the poly-V groove structural plastic optical fibre displacement sensor duplicate measurements three times of the present invention
Strong response curve.It can be seen that the sensor has preferable repeatability.
It is bent for the positive stroke and revesal test of the poly-V groove structural plastic optical fibre displacement sensor of the present invention referring to Fig. 6
Line.It can be seen that the return difference of the sensor is smaller.
Claims (4)
1. a kind of macrobending poly-V groove structural plastic optical fibre displacement sensor, it is characterised in that：By light source, macrobending poly-V groove
The compositions such as structural plastic method using in optic fiber displacement sensor probe, Displacement-deformation device and photoelectric detection system.
2. a kind of macrobending poly-V groove structural plastic optical fibre displacement sensor described in claim 1, it is characterised in that：Made
Plastic optical fiber is the multimode plastic optical fiber of general commercial, and the outer diameter of optical fiber is 250~1500 μm, core diameter is 240~
1480μm。
3. a kind of plastic optical fiber displacement sensor of macrobending poly-V groove structure described in claim 1, the V of fibre-optical probe
Shape slot structure is that the method shaped by pressing mold is prepared.Its process is：Plastic optical fiber is placed in the steel with U-shaped groove structure
In the lower mold of system, then the steel die with poly-V groove structure is placed in above plastic optical fiber, makes V-shaped groove structure and optical fiber
It is axially vertical, by applying pressure to upper mold, optical fiber can be made to deform upon, to along the central axial of plastic optical fiber
On can form multiple V-shaped groove structures.
4. a kind of plastic optical fiber displacement sensor of macrobending poly-V groove structure described in claim 1, macrobend optical fiber is visited
Head is that the plastic optical fiber with V-shaped groove structure that will be prepared is wrapped on a hollow Elastic Cylindrical body, and makes V-shaped groove
Obtained from structure facing away from the direction of elastomer outwardly.
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Cited By (5)
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| CN109887676A (en) * | 2019-02-27 | 2019-06-14 | 华南理工大学 | A kind of photoelectricity combination electrode optical fiber and the preparation method and application thereof |
| CN112432929A (en) * | 2020-12-08 | 2021-03-02 | 桂林电子科技大学 | V-groove structure plastic optical fiber SPR sensor and preparation method thereof |
| CN112461795A (en) * | 2020-12-08 | 2021-03-09 | 桂林电子科技大学 | Plastic optical fiber SPR array sensor and preparation method thereof |
| CN114034664A (en) * | 2021-11-10 | 2022-02-11 | 山东省科学院激光研究所 | Plastic optical fiber refractive index sensor based on V-shaped structure and working method thereof |
| CN114858194A (en) * | 2022-04-15 | 2022-08-05 | 黑龙江大学 | Twist-shaped plastic optical fiber respiration sensor and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109887676A (en) * | 2019-02-27 | 2019-06-14 | 华南理工大学 | A kind of photoelectricity combination electrode optical fiber and the preparation method and application thereof |
| CN112432929A (en) * | 2020-12-08 | 2021-03-02 | 桂林电子科技大学 | V-groove structure plastic optical fiber SPR sensor and preparation method thereof |
| CN112461795A (en) * | 2020-12-08 | 2021-03-09 | 桂林电子科技大学 | Plastic optical fiber SPR array sensor and preparation method thereof |
| CN114034664A (en) * | 2021-11-10 | 2022-02-11 | 山东省科学院激光研究所 | Plastic optical fiber refractive index sensor based on V-shaped structure and working method thereof |
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| CN114858194A (en) * | 2022-04-15 | 2022-08-05 | 黑龙江大学 | Twist-shaped plastic optical fiber respiration sensor and preparation method thereof |
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