CN106841109B - The U-shaped plastic optical fiber liquid refractive index sensor of multi-groove structure - Google Patents
The U-shaped plastic optical fiber liquid refractive index sensor of multi-groove structure Download PDFInfo
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- CN106841109B CN106841109B CN201710069231.1A CN201710069231A CN106841109B CN 106841109 B CN106841109 B CN 106841109B CN 201710069231 A CN201710069231 A CN 201710069231A CN 106841109 B CN106841109 B CN 106841109B
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- optical fiber
- plastic optical
- groove structure
- shaped plastic
- refractive index
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/412—Index profiling of optical fibres
Abstract
A kind of U-shaped plastic optical fiber liquid refractive index sensor of multi-groove structure, belongs to technical field of optical fiber sensing.It is made of the U-shaped plastic optical fiber probe and photoelectric detection system of light source, multi-groove structure.The multi-groove structure U-shaped plastic optical fiber probe be plastic optical fiber is vertically disposed in surface with section be the steel die of triangular sawtooth structure in the following, vertex of a triangle is directed toward the center line of plastic optical fiber jointly；It reuses fixture and pressure is applied to steel die, under the effect of the pressure, suppress the multi-groove structure of multiple V-grooves on fibre core of the plastic optical fiber along cross-sectional centerline using the triangular sawtooth structure of mold；Then the plastic optical fiber and the symmetrical another side of multi-groove structure are wound on one to be heated on 75~95 DEG C or so of cylindrical steel column, finally apply the pulling force of 3~6N or so at the both ends of optical fiber and is prepared.The sensor has structure and preparation process simple, low in cost, and has the characteristics that higher sensitivity.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, and in particular to a kind of U-shaped plastic optical fiber liquid refracting of multi-groove structure
Rate sensor.
Background technique
Refractive index is an important optical parameter of substance, its measurement is in food, environment, pharmacy and biochemistry
Equal fields important in inhibiting.The important parameters such as strength of fluid can also be obtained by the measurement to liquid refractivity.In recent years,
Using optical fiber sensing technology measurement liquid refractivity obtained it is more and more research and application, it have electromagnetism interference, absolutely
Edge, it is anticorrosive, telework can be carried out and can realize the advantages such as distributed sensing.
Current existing fiber liquid refractive index sensor generally uses fiber grating, such as: number of patent application
A kind of 201210152365.7 Chinese invention patent " micro-nano fiber grating refractive index sensor " provides a kind of using micro-nano
Fiber grating realizes the measurement of liquid refractivity.But this fiber grating be by uv-exposure method, femtosecond laser inscribe method,
Prepared by focused ion beam etching method or infrared exposure method, complex process, and cost is also very high.Number of patent application
201310335715.8 Chinese invention patent " fibre optic interferometer, fibre optical sensor and preparation method thereof " provides a kind of structure
Simple photonic crystal fiber F-P interferometer, can be used for the measurement of liquid refractivity.But the production of this interferometer is also required to make
With carbon dioxide laser or heat sealing machine, technique is also complex, and used photonic crystal fiber price is also more expensive.
And the optic fibre refractive index sensor of above structure requires to measure signal using spectrometer, to increase test
Cost.Therefore, it develops a kind of structure and preparation process is simple, and low-cost optic fibre refractive index sensor seems especially heavy
It wants.
Summary of the invention
That the object of the present invention is to provide a kind of structures is simple, preparation process is simple, low in cost, and has more highly sensitive
The U-shaped plastic optical fiber liquid refractive index sensor of the multi-groove structure of degree.
To solve the above problems, as the first aspect of the present invention, the U-shaped plastic optical fiber for providing a kind of multi-groove structure is visited
The preparation method of head, including S1: it is the steel die of triangular sawtooth structure that plastic optical fiber, which is vertically disposed in surface to have section,
Tool is in the following, vertex of a triangle is directed toward the center line of plastic optical fiber jointly；S2: applying pressure to steel die using fixture,
Under the action of pressure, suppressed on fibre core of the plastic optical fiber along cross-sectional centerline using the triangular sawtooth structure of mold multiple
The multi-groove structure of V-groove；S3: the plastic optical fiber and the symmetrical another side of multi-groove structure are wound on one and are heated to 75~95
DEG C or so cylindrical steel column on, then apply the pulling force of 3~6N or so at the both ends of optical fiber, so that multiple-grooved be prepared
The U-shaped plastic optical fiber of structure is popped one's head in.
As a second aspect of the invention, a kind of U-shaped plastic optical fiber liquid refractive index sensor of multi-groove structure is provided,
It is made of the U-shaped plastic optical fiber probe and photoelectric detection system of light source, multi-groove structure.Because of the U of prepared multi-groove structure
Plastic fibre-optical probe has symmetrical structure, its any end can be connected with light source, and the other end is then filled with Photoelectric Detection
It sets connected.
The present invention may also include:
1, the depth of U-shaped plastic optical fiber probe multi-groove structure can apply stressed size by alignment jig and be controlled
System；Width between the slot of the described U-shaped plastic optical fiber probe multi-groove structure, V-groove angle and total length can be by using having
The steel die of different tooth widths, zigzag angle and different length is changed.
2, the U-shaped plastic optical fiber probe of multi-groove structure can change optical fiber by using the cylindrical steel column of different-diameter
The bending radius of probe.
3, on the one hand the U-shaped plastic optical fiber probe of multi-groove structure can produce bigger transmission loss and stronger disappearance
, so that the variations in refractive index to ambient enviroment is more sensitive because the fibre-optical probe of this structure can increase sandwich layer mould with
The coupling efficiency of cladding mode and radiation mode transmits the total reflection condition of light when ambient refractive index of popping one's head in changes in optical fiber
It is easily destroyed, this will lead to its transmission loss and apparent variation occurs；On the other hand, U-shaped sonde configuration is conducive to sense
The design and operation of device.
4, the plastic optical fiber is multimode plastic optical fiber, and the outer diameter of optical fiber is 250~1500 μm, and core diameter range is
240~1480 μm.
5, the depth of the multi-groove structure of the U-shaped plastic optical fiber probe of the multi-groove structure is 50~500 μm, multi-groove structure
Slot between width be 0.5~2.5mm, the total length of multi-groove structure is 0.5~23mm, and V-groove angle is 30~150 °.
6, the bending radius of the U-shaped plastic optical fiber probe of the multi-groove structure is 2~7mm.
7, the light source can be the semiconductor laser that launch wavelength is 650nm, be also possible to center emission wavelength
For the LED of 650nm；The photoelectric detection system is light power meter.
The present invention is the generated biography when contacting with fluid to be measured of being popped one's head in using the U-shaped plastic optical fiber with multi-groove structure
The measurement of defeated loss changed to realize refractive index, the U-shaped plastic optical fiber probe with multi-groove structure can increase sensor
To the sensibility of ambient enviroment variations in refractive index, the high-sensitivity measurement to liquid refractivity is realized.
The present invention is the principle based on long-period fiber grating, and the multi-groove structure prepared on plastic optical fiber can cause optical fiber
Power coupling between middle transmission mode, so that transmission loss can be generated.
Since used plastic optical fiber is multimode plastic optical fiber, there is a large amount of sandwich layer mould and cladding mode, their coupling
It closes and occurs on all wave bands, wavelength is unsolvable, therefore the sensor is more suitable for intensity modulated rather than wavelength tune
System.Coupling between mode results in the generation of transmission loss, and this coupling includes coupling and the sandwich layer mould of sandwich layer mould and cladding mode
With the coupling of radiation mode.Radiation mode can be leaked to the outside of fiber core layer and covering, enter in surrounding medium.U-shaped knot
Structure can be such that more sandwich layer moulds are coupled with cladding mode and radiation mode, so as to cause more transmission loss, increase sensor
Sensitivity.Loss caused by this coupling can be modulated by the variations in refractive index of ambient enviroment, therefore be passed by monitoring
The variation of defeated loss can be obtained by the variation of testing liquid refractive index.In addition, pass through the relationship of strength of fluid and refractive index, it should
Sensor can also be used to measure the concentration of liquid.
Compared with prior art, the present invention has the advantage that
1) production of index sensor sensing probe of the invention does not need complicated grating writing equipment, does not need yet
Corrosion or rubbing down, manufacture craft is simple, is easy to control, low in cost, convenient for commercially producing.
2) light source of index sensor of the invention uses semiconductor laser or LED, cheap, and only
The variation that light power meter detection output signal need to be used, reduces the cost of entire sensor in this way.
3) for index sensor of the invention using multimode plastic optical fiber, core diameter is larger, and flexibility is good, therefore grasps
Make simply, and the working sensor, in visible light wave range, installation and debugging are all very simple.
4) the U-shaped plastic optical fiber probe measurement liquid refractivity of multi-groove structure used by index sensor of the invention
Sensitivity with higher.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of plastic optical fiber index sensor of the invention；
Fig. 2 is the manufacturing process schematic diagram of multi-groove structure plastic optical fiber of the invention；
Fig. 3 is the schematic diagram with multi-groove structure plastic optical fiber of the invention；
Fig. 4 is the manufacturing process schematic diagram of the U-shaped plastic optical fiber probe with multi-groove structure of the invention；
Fig. 5 is the liquid refractivity of apparatus of the present invention measurement and the relationship and matched curve figure of transmission loss.
Specific embodiment
Specific implementation of the invention is described in further detail with reference to the accompanying drawing, but implementation and protection of the invention
Range is without being limited thereto, makees the identical equivalent replacement of essence to the present invention and all belongs to the scope of protection of the present invention.Embodiment 1: to survey
For amount glycerine water solution
Referring to Fig. 1, the U-shaped plastic optical fiber index sensor of multi-groove structure of the invention, by light source 1, multi-groove structure
Plastic optical fiber sensing probe 2 and light power meter 3 form.Since made fibre-optical probe has symmetrical structure, light source can be with
Any end of fibre-optical probe is connected by optical fiber, and the other end of fibre-optical probe then passes through optical fiber and is connected with light power meter.In work
When making, the light that light source 1 issues reaches the probe of the U-shaped plastic optical fiber with multi-groove structure 2 by optical fiber, when with multi-groove structure
U-shaped plastic optical fiber probe 2 when being inserted into detected solution, optical signal and detected solution produce interaction, after modulating
Optical signal be input in light power meter through optical fiber, light power meter is by photoelectric conversion and signal processing by detected light
Performance number shows that shown optical power value can change with the variation of the refractive index value of solution.It is obtained by measurement
Optical power value can calculate transmission loss, transmission loss is calculated by following formula,
Loss=-10*log (Ps/Pw)dB
P in formulasAnd PwThe average optical output power of detector when being the glycerine water solution and deionized water of measurement respectively.
The corresponding transmission loss of different refractivity (concentration) glycerine water solution can be calculated by measuring optical power value
Value (refractive index or concentration be known), and then fitting obtains the response curve between transmission loss and refractive index (concentration), recycling
This response curve can calculate the refractive index value of glycerine water solution by measuring obtained transmission loss value.
Referring to fig. 2, plastic optical fiber used by the present embodiment is the multimode of Jiangxi Dasheng POF Co., Ltd.'s production
Commercial plastic optical fiber, the outer diameter of optical fiber are 1000 ± 1 μm, and core diameter is 980 ± 1 μm.It can will be more using the method for compression molding
Slot structure is prepared on plastic optical fiber 4.Make the steel that the device with multi-groove structure plastic optical fiber includes triangular sawtooth structure
Molding jig 5 and fixture 6.Specifically the preparation method comprises the following steps: plastic optical fiber 4 is vertically disposed in the steel with triangular sawtooth structure
Mold 5 is in the following, then apply pressure to steel die 5 by fixture 6 will form on plastic optical fiber 4 under the effect of the pressure
Multi-groove structure；
Referring to Fig. 3, mainly there are four technical indicators for the plastic optical fiber 7 with multi-groove structure, are respectively as follows: multiple-grooved depth, V-type
Width and multiple-grooved length between the angle of the v-groove, slot.Fig. 2 is referred to, 6 pressure applied size of alignment jig, the sawtooth of mold 5 are passed through
The length of the size and mold of shape angle and tooth width, thus it is possible to vary the technical indicator of above-mentioned multi-groove structure.Preferably, more
Groove depth is 200 μm, and V-groove angle is 60 °, and width is 1mm between slot, and multiple-grooved length is 10mm.
Referring to fig. 4, using the method for thermal finalization U-shaped optical fiber is made in the plastic optical fiber 7 with multi-groove structure by the present embodiment
Probe.Specifically the preparation method comprises the following steps: the plastic optical fiber 7 and the symmetrical another side of multi-groove structure, which are wound on one, is heated to 80
DEG C cylindrical steel column 8 on, then apply the pulling force of 5N or so at the both ends of optical fiber, so that can get one has multiple-grooved
The U-shaped plastic optical fiber probe 2 of structure.Preferably, the bending radius of U-shaped plastic optical fiber probe is 3mm.
Fig. 5 is that different refractivity value measured by the U-shaped plastic optical fiber index sensor of the multi-groove structure of production is (dense
Degree) glycerine water solution response curve.It needs for plastic optical fiber sensing probe to be immersed in glycerine water solution when measurement, so
The Output optical power of read detector afterwards, we record ten groups of data for measurement each time, and using their average value as
The output valve of sensor.After measuring each time, need to clean probe using alcohol and deionized water, then dry up again into
The measurement of row next time.Obtained result will finally be measured to provide in the form of transmission loss, referring to described in Fig. 1, thus
The response curve of the sensor is obtained.
The refractometry range of the sensor is 1.333~1.410, and measurement sensitivity S can be by response curve
Slope determines that it can be expressed as,
Wherein L and n is transmission loss and refractive index respectively, and the sensitivity of the sensor is up to 111.30dB/RIU (RI
Unit), resolution ratio is 7.81 × 10-4RIU。
In addition, since the glycerine water solution of different refractivity value is obtained by changing the volume fraction of glycerol in solution
, therefore the relationship between transmission loss and glycerol concentration (volume fraction) can also be established.
The different volumes concentration of glycerine water solution and the corresponding relationship of refractive index are as shown in table 1.
Table 1: the different volumes concentration of glycerite and the corresponding relationship of refractive index
| Glycerite volumetric concentration (%) | Corresponding refractive index |
| 0 | 1.333 |
| 5.38 | 1.340 |
| 13.08 | 1.350 |
| 20.77 | 1.360 |
| 28.46 | 1.370 |
| 36.15 | 1.380 |
| 43.85 | 1.390 |
| 51.54 | 1.400 |
| 59.23 | 1.410 |
Claims (6)
1. a kind of U-shaped plastic optical fiber liquid refractive index sensor of multi-groove structure, it is characterised in that: by light source, the U of multi-groove structure
One end of plastic fibre-optical probe and photoelectric detection system composition, the U-shaped plastic optical fiber probe of multi-groove structure is connected with light source,
The other end is then connected with photoelectric detection system；And the U-shaped plastic optical fiber probe of the multi-groove structure is prepared by following steps,
S1: it is the steel die of triangular sawtooth structure in the following, triangle that plastic optical fiber, which is vertically disposed in surface with section,
Vertex be directed toward the center line of plastic optical fiber jointly；
S2: pressure is applied to steel die using fixture and is being moulded under the effect of the pressure using the triangular sawtooth structure of mold
Material optical fiber suppresses the multi-groove structure of multiple V-grooves along the fibre core of cross-sectional centerline；
S3: the plastic optical fiber and the symmetrical another side of multi-groove structure are wound on the cylindrical steel for being heated to 75~95 DEG C
On column, then apply the pulling force of a 3~6N at the both ends of optical fiber, so that the U-shaped plastic optical fiber that multi-groove structure is prepared is visited
Head.
2. a kind of U-shaped plastic optical fiber liquid refractive index sensor of multi-groove structure as described in claim 1, it is characterised in that:
Plastic optical fiber is multimode plastic optical fiber, and the outer diameter of optical fiber is 250~1500 μm, and core diameter is 240~1480 μm.
3. a kind of U-shaped plastic optical fiber liquid refractive index sensor of multi-groove structure as described in claim 1, it is characterised in that more
The depth of slot structure is 50~500 μm, and width is 0.5~2.5mm between the slot of multi-groove structure, and the total length of multi-groove structure is 0.5
~23mm, V-groove angle are 30~150 °.
4. a kind of U-shaped plastic optical fiber liquid refractive index sensor of multi-groove structure as described in claim 1, it is characterised in that:
The bending radius of the U-shaped plastic optical fiber probe of multi-groove structure is 2~7mm.
5. a kind of U-shaped plastic optical fiber liquid refractive index sensor of multi-groove structure as described in claim 1, it is characterised in that:
The LED that light source is the semiconductor laser that launch wavelength is 650nm or center emission wavelength is 650nm.
6. a kind of U-shaped plastic optical fiber liquid refractive index sensor of multi-groove structure as described in claim 1, it is characterised in that:
Photoelectric detection system is light power meter.
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| CN107478605A (en) * | 2017-07-17 | 2017-12-15 | 吉林大学 | A kind of U-shaped plastic optical fiber long-period gratings surface plasma liquid refractive index sensor |
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| CN111552022B (en) * | 2020-03-29 | 2022-04-19 | 桂林电子科技大学 | Grating inscription technology suitable for optical fiber core in any shape and distribution |
| CN112098366B (en) * | 2020-07-27 | 2022-10-25 | 桂林电子科技大学 | Embedded double-U-shaped refractive index sensor for realizing three Fano resonances |
| CN114034664B (en) * | 2021-11-10 | 2024-03-01 | 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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