CN107238582A - A kind of material refractive index remote measuring unit and its measuring method - Google Patents
A kind of material refractive index remote measuring unit and its measuring method Download PDFInfo
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- CN107238582A CN107238582A CN201710301827.XA CN201710301827A CN107238582A CN 107238582 A CN107238582 A CN 107238582A CN 201710301827 A CN201710301827 A CN 201710301827A CN 107238582 A CN107238582 A CN 107238582A
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/08—Optical fibres; light guides
- G01N2201/088—Using a sensor fibre
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- Life Sciences & Earth Sciences (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
It is specially that the material refractive index based on cross-correlation optical time domain Fresnel reflection technology is remotely measured the present invention relates to material refractive index fields of measurement.A kind of material refractive index remote measuring unit, includes amplified spontaneous emission source, dense wavelength division multiplexing device, erbium-doped fiber amplifier, the first fiber coupler, optical circulator, sensor fibre, the first photodetector, the second photodetector, sensing unit, capture card and the computer in broadband.The invention further relates to the method for the measurement device.The present invention characterizes material refractive index and fiber core index of refraction relationship by cross-correlation peak of curve, and then obtain material refractive index, multiple spot material refractive index under the hazardous environments such as inflammable and explosive, chemical plant can be achieved to measure, there is essential safety, electromagnetism interference, anticorrosive and telemeasurement.
Description
Technical field
It is specially the thing based on cross-correlation optical time domain Fresnel reflection technology the present invention relates to material refractive index fields of measurement
Matter refractive index is remotely measured.
Background technology
Refractive index parameter as material inherent attribute, with material chemistry and physical property have it is close contact, institute
So that in some fields, the refractometry of material has very important Research Significance.However, prior art is generally closely
The electronic sensor of measurement, it is impossible to meet the refraction of the material under the adverse circumstances such as electromagnetic interference, burn into be inflammable and explosive very well
Rate measurement demand.
The content of the invention
The technical problems to be solved by the invention are：The measurement for how solving material refractive index under long-range adverse circumstances is asked
Topic.
The technical solution adopted in the present invention is：A kind of material refractive index remote measuring unit, including broadband amplification from
Send out radiation source, dense wavelength division multiplexing device, erbium-doped fiber amplifier, the first fiber coupler, optical circulator, sensor fibre, the
One photodetector, the second photodetector, sensing unit, capture card and computer, the amplified spontaneous emission source in broadband is sequentially
Dense wavelength division multiplexing device, erbium-doped fiber amplifier are connected, the output port of erbium-doped fiber amplifier connects the first fiber coupler
Input port, the first output port of the first fiber coupler connects a ports of optical circulator, the second of the first fiber coupler
Output port connects the input port of the first photodetector, and the port b of optical circulator connects sensing unit, light by sensor fibre
The port c of circulator connects the input port of the second photodetector, and the output port of the first photodetector and the second photoelectricity are visited
The output port for surveying device all connects computer by capture card.
It is used as a kind of preferred embodiment：Sensing unit includes optical fiber flange and optical patchcord, and the fibre-optical splice of optical patchcord leads to
The fibre-optical splice that optical fiber flange is crossed with an other optical patchcord is connected, and utilizes the optical fiber flange for connecting every optical fiber jumper terminal
Introduce gap.
It is used as a kind of preferred embodiment：Sensing unit include the second fiber coupler, sensor fibre transmission optical signal according to
Luminous power is classified as two ways of optical signals by the second fiber coupler, wherein optical signal is by the second fiber coupler all the way
First output port is connected to next section of sensor fibre, the second output port of the second fiber coupler connect one section be placed in it is a certain
Optical fiber in the material of refractive index.
A kind of method that material refractive index remote measuring unit carries out long-range material refractive index measurement, according to the steps
Carry out
Step 1: being rolled over by optical fiber flange or the second preparing fiber coupler sensing unit, and by sensing unit connection material
Penetrate other parts of rate remote measuring unit；
Step 2: sensing unit is placed in air, reference light and the scattered light comprising Fresnel reflection information are carried out mutual
Pass is handled, and obtains cross-correlation curve along optical fiber, and the curve includes the positional information that Fresnel reflection occurs, while its relevant peaks
Peak value characterizes fiber core refractive index and the relation of air refraction；
Step 3: sensing unit is sequentially placed into many kinds of substance of refractive index to be measured, by with step 2 identical method, obtain
Obtain related peak-to-peak value；
Step 4: by the result of step 3 and step 2 Comparative result, and carry out curve fitting, set up related peak-to-peak value and material
The functional relation of refractive index, realizes that material refractive index is measured.
The beneficial effects of the invention are as follows：The present invention utilizes Fresnel reflection principle and cross-correlation optical time domain reflection technology, profit
Positioned with cross-correlation technique, realize the measurement of many kinds of substance refractive index under long-range adverse circumstances.With long range, anti-electromagnetism
The advantages of interference, anticorrosive, essential safety.
Brief description of the drawings
Fig. 1 is schematic device of the invention；
Fig. 2 is a kind of sensing unit structures schematic diagram of the invention；
Fig. 3 is another sensing unit structures schematic diagram of the invention；
Wherein, 1, the amplified spontaneous emission source in broadband, 2, dense wavelength division multiplexing device, 3, erbium-doped fiber amplifier, the 4, first light
Fine coupler, 5, optical circulator, 6, sensor fibre, the 7, first photodetector, the 8, second photodetector, 9, sensing unit,
10th, capture card, 11, computer, 12, FC type fiber flanges, 13, optical patchcord, 14, the material of a certain refractive index, 15, second
Fiber coupler.
Embodiment
Embodiment one：
As depicted in figs. 1 and 2, a kind of material refractive index remote measuring unit, the main amplified spontaneous emission source 1 including broadband,
Dense wavelength division multiplexing device 2, erbium-doped fiber amplifier 3, the first fiber coupler 4, optical circulator 5, sensor fibre 6, the first light
Electric explorer 7, the second photodetector 8, sensing unit 9, capture card 10 and computer 11, the amplified spontaneous emission source 1 in broadband
The input port of dense wavelength division multiplexing device 2 is connected, to filter out the noise like optical signal near centre wavelength, the optical signal is connect
Enter the input of erbium-doped fiber amplifier 3, by adjusting the pumping current of erbium-doped fiber amplifier 3, it is amplified, and connects
Enter the input of the first fiber coupler 4, it is 99% that the first fiber coupler is classified as luminous power accounting by luminous power accounting
Be with luminous power accounting all the way 1% all the way, wherein luminous power accounting for 1% optical signal all the way as reference light, and via the
One photodetector 7 is converted into electric signal, connects the first input port of capture card 10；Luminous power accounting is 99% light all the way
Signal accesses a ports of optical circulator 5 by the first output port of the first fiber coupler, and by the b ports of optical circulator 5
Inject sensor fibre 6 and sensing unit 9.The scattered light of sensor fibre 6 and sensing unit 9 is accessed by the c ports of optical circulator 5
Second photodetector 8 is converted into electric signal, and connects the second input port of capture card 10.Capture card 10 gathers reference simultaneously
Signal and scattered signal, signal is sent into computer 11 afterwards and carries out cross correlation process, and show cross-correlation along optical fiber simultaneously
Curve.
Fig. 2 is a kind of implementation of sensing unit 9 of the present invention, including sensor fibre 6, FC type fiber flanges
12, optical patchcord 13.
Light is incident in the different medium of another refractive index by a kind of index medium, in its incident light of wave surface and reflection
The relation of light can be obtained by Fresnel reflection principle.Because the incidence angle of light injection fibre is less than 30 DEG C, p- polarization directions and s-
The reflection R p and Rs of polarization direction can be neglected, thus now the reflectance factor of wave surface can be by formula（1）Obtain：
（1）
Wherein,n 0 For fiber core refractive index,n f For test substance refractive index.
Therefore, if FC type fibers flange 12 is connected by optical patchcord 13, and the fibre-optical splice of optical patchcord 13 is ensured
Certain interval is left between optical fiber flange 12, when the gap is full of the material 14 of a certain refractive index（Test substance）When, detection
Light produces Fresnel reflection in the contact surface of FC type fibers flange 12 and test substance.Cross-correlation technique, the phenanthrene are combined afterwards
The position that Nie Er reflections occur can be by formula（2）Obtain：
（2）
Wherein,u r For reference optical signal,u f To include the scattered light signal of Fresnel reflection information,kOccur for Fresnel reflection
Position,cc{ } is cross-correlation calculation.Meanwhile, the peak value of the relevant peaks characterizes fiber core refractive index and gap substance refractive index
Relation.
If only connecing a FC type fibers flange 12 in the end of sensor fibre 6, the measurement of single-point material refractive index can be achieved；If
Multiple above-mentioned optical fiber flanges are connected, different material refractive index at measurable diverse location realizes quasi-distributed detection.
Embodiment two
It is with the difference of embodiment one as shown in figure 3, present embodiment is another implementation of sensing unit 9,
Including sensor fibre 6, the second fiber coupler 15.The optical signal that sensor fibre 6 is transmitted passes through the second light according to luminous power
Fine coupler 15 is classified as two ways of optical signals, wherein optical signal is noted by the output port of the second fiber coupler 15 first all the way
Enter next section of sensor fibre 6, the second output port of the second fiber coupler 15 connects one section of material for being placed in a certain refractive index
In optical fiber.
It is anti-that Fresnel can be produced in the fibre-optical splice of the second fiber coupler 15 and the contact surface of material 14 of a certain refractive index
Penetrate, and combine cross-correlation technique, position, the herein refractive index of material and the fiber core that can obtain Fresnel reflection generation are rolled over
Penetrate the relation of rate.
If only connecing second fiber coupler 15 in the end of sensor fibre 6, the measurement of single-point material refractive index can be achieved；If
Multiple second fiber couplers 15 are connected in the form of accompanying drawing 3, the quasi-distributed measurement of material refractive index can be achieved.
Present invention is not limited only to the content of the respective embodiments described above, the group of one of them or several embodiments
Contract sample can also realize the purpose of invention.
Claims (4)
1. a kind of material refractive index remote measuring unit, it is characterised in that：Amplified spontaneous emission source including broadband（1）, it is intensive
Type wavelength division multiplexer（2）, erbium-doped fiber amplifier（3）, the first fiber coupler（4）, optical circulator（5）, sensor fibre（6）、
First photodetector（7）, the second photodetector（8）, sensing unit（9）, capture card（10）And computer（11）, broadband
Amplified spontaneous emission source（1）It is sequentially connected with dense wavelength division multiplexing device（2）, erbium-doped fiber amplifier（3）, erbium-doped fiber amplifier
（3）Output port connect the first fiber coupler（4）Input port, the first fiber coupler（4）The first output port connect
Optical circulator（5）A ports, the first fiber coupler（4）The second output port connect the first photodetector（7）Input
Mouthful, optical circulator（5）Port b sensing unit is connected by sensor fibre（9）, optical circulator（5）Port c connect the second photoelectricity
Detector（8）Input port, the first photodetector（7）Output port and the second photodetector（8）Output port
All pass through capture card（10）Connect computer（11）.
2. a kind of material refractive index remote measuring unit according to claim 1, it is characterised in that：Sensing unit（9）Bag
Include optical fiber flange（12）And optical patchcord（13）, optical patchcord（13）Fibre-optical splice pass through optical fiber flange（12）With other one
Optical patchcord（13）Fibre-optical splice connection, using connecting every optical patchcord（13）The optical fiber flange of joint（12）Between introducing
Gap.
3. a kind of material refractive index remote measuring unit according to claim 1, it is characterised in that：Sensing unit（9）Bag
Include the second fiber coupler（15）, sensor fibre（6）The optical signal of transmission passes through the second fiber coupler according to luminous power（15）
Two ways of optical signals is classified as, wherein optical signal passes through the second fiber coupler all the way（15）The first output port be connected to down
One section of sensor fibre（6）, the second fiber coupler（15）The second output port connect one section of material for being placed in a certain refractive index
In optical fiber.
4. a kind of material refractive index remote measuring unit using described in claim 2 or claim 3 carries out long-range material
The method of refractometry, it is characterised in that：Carried out according to the steps
Step one：Pass through optical fiber flange（12）Or second fiber coupler（15）Make sensing unit（9）, and by sensing unit
（9）Connect other parts of material refractive index remote measuring unit；
Step 2：By sensing unit（9）It is placed in air, reference light and the scattered light comprising Fresnel reflection information is carried out mutual
Relevant treatment, obtains cross-correlation curve along optical fiber, and the curve includes the positional information that Fresnel reflection occurs, while it is related
Peak-to-peak value characterizes fiber core refractive index and the relation of air refraction；
Step 3: by sensing unit（9）In many kinds of substance for being sequentially placed into refractive index to be measured, by with step 2 identical side
Method, obtains related peak-to-peak value；
Step 4：By the result of step 3 and step 2 Comparative result, and carry out curve fitting, set up related peak-to-peak value and material
The functional relation of refractive index, realizes that material refractive index is measured.
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| CN201710301827.XA CN107238582A (en) | 2017-05-02 | 2017-05-02 | A kind of material refractive index remote measuring unit and its measuring method |
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Cited By (1)
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| CN107907310A (en) * | 2017-11-02 | 2018-04-13 | 太原理工大学 | A kind of portable two-way optical fibre refractivity measuring device |
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