CN210604364U - Detection photonic crystal fiber and optical fiber sensor - Google Patents
Detection photonic crystal fiber and optical fiber sensor Download PDFInfo
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- CN210604364U CN210604364U CN201921581872.6U CN201921581872U CN210604364U CN 210604364 U CN210604364 U CN 210604364U CN 201921581872 U CN201921581872 U CN 201921581872U CN 210604364 U CN210604364 U CN 210604364U
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Abstract
The utility model discloses a survey photonic crystal optic fibre and optical fiber sensor relates to optical fiber sensing technical field. The photonic crystal fiber for detection includes: the optical fiber comprises an optical fiber body, a sample channel, a coating film and an air hole. The photonic crystal fiber for detection only comprises a sample channel, an indium tin oxide film is plated on the inner surface of the sample channel, a plurality of fiber cores are arranged around the sample channel, and the fiber cores are arranged on the sample channelThe multiple fiber cores arranged around the sample channel can improve the influence of incident light waves on the effective refractive indexes of the surface plasma mode and the fiber core mode, so that the optical fiber sensor provided with the detection photonic crystal fiber can realize 104The wavelength sensitivity of nm RIU magnitude, the utility model discloses an optical fiber sensor has the high advantage of sensitivity. The coating material selected by the utility model is indium tin oxide, which can reduce the manufacturing cost of detecting photonic crystal fiber and optical fiber sensor.
Description
Technical Field
The utility model relates to an optical fiber sensing technology field especially relates to a survey photonic crystal optic fibre and optical fiber sensor.
Background
The high precision, ultra-sensitive and ultra-wideband are the main direction of the development of the optical fiber sensing technology, and have very important significance in promoting scientific research and promoting social and economic development. The photonic crystal fiber sensing technology based on surface plasma resonance is a novel and advanced detection technology which is internationally raised in recent years, and is widely applied to the fields of safety production, biomedicine, drug screening, food safety, aerospace, environmental detection, national defense science and technology and the like due to the advantages of electromagnetic interference resistance, corrosion resistance, high sensitivity, electric insulation, small volume, light weight, small influence on a measured substance, changeable appearance, wide measurement objects, convenience in network formation, capability of being used for remote measurement and the like. The working principle of the photonic crystal fiber sensing technology based on surface plasma resonance is that evanescent waves formed when incident light is subjected to internal total reflection at the interface of a photonic crystal fiber and a metal can initiate free electron coherent oscillation on the metal surface, and further surface plasma waves are generated. When the evanescent wave and the surface plasma wave are in resonance coupling, energy is transferred into the surface plasma from photons, so that the plasma wave can absorb most of the energy of incident light, the detected transmitted light intensity is greatly weakened, a lowest peak value is formed, and finally the purpose of detecting the attribute of an unknown substance is achieved by measuring the resonance wavelength or the position of a loss peak of an analyte to be detected.
Nowadays, the non-polarization-maintaining refractive index guiding type photonic crystal fiber sensor based on surface plasmon resonance mainly has not enough high sensitivity, and the wavelength sensitivity is only high103Deficiency in the order of nm/RIU. Therefore, the conventional optical fiber sensor has a problem of low sensitivity.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a survey photonic crystal optic fibre and optical fiber sensor has solved the low problem of optical fiber sensor sensitivity.
In order to achieve the above object, the utility model provides a following scheme:
a photonic crystal fiber for detection, comprising: the optical fiber comprises an optical fiber body, a sample channel, a coating film and an air hole;
the sample channel is arranged in the optical fiber main body, the sample channel is coaxially arranged with the optical fiber main body, and the sample channel is positioned in the center of the optical fiber main body; the sample channel is used for placing liquid to be detected;
the coating is tightly attached to the inner surface of the sample channel and is used for generating surface plasma waves;
the air holes are arranged in the optical fiber main body, the number of the air holes is multiple, and the central axes of the air holes are parallel to the central axis of the optical fiber main body;
a plurality of the air holes are arranged around the sample channel in a regular hexagon;
the plurality of air holes are arranged into four layers of regular hexagons, a first layer of regular hexagons is arranged around the sample channel by taking the sample channel as a center, a second layer of regular hexagons is arranged outside the first layer of regular hexagons, a third layer of regular hexagons is arranged outside the second layer of regular hexagons, and a fourth layer of regular hexagons is arranged outside the third layer of regular hexagons;
and filling liquid to be detected in the air holes of the second layer of regular hexagons in the preset number, wherein the air holes of the preset number filled with the liquid to be detected are symmetrically arranged, and the radius of the air holes of the preset number filled with the liquid to be detected is smaller than that of the air holes not filled with the liquid to be detected.
Optionally, the substrate material of the optical fiber body is pure quartz.
Optionally, the cross section of the sample channel is circular, and the radius of the sample channel is 1 micrometer.
Optionally, the material of the coating film is indium tin oxide;
the thickness of the coating is 40-60 nm.
Optionally, the cross section of the air hole is circular, and the radius of the air hole is 0.5 micrometer.
Optionally, the radius of the air holes filled with the liquid to be measured in the preset number is 0.05 to 0.45 micrometers, and the preset number is four.
Optionally, the cross section of the optical fiber body is circular, and the radius of the optical fiber body is 9.5 micrometers to 11 micrometers.
A fiber optic sensor, comprising: a light source, a polarizer, a coupling optical lens, a spectrum analyzer and the detection photonic crystal fiber;
the light source is used for providing a continuous incident light wave with stable output;
the polarizer is positioned on a first emergent light path of the light source; the polarizer is used for adjusting the polarization state of the incident light wave;
the coupling optical lens is positioned on a second emergent light path of the polarizer; the coupling optical lens is used for coupling the second emergent light path to the detection photonic crystal fiber;
the detection photonic crystal fiber is positioned on the focus of the coupling optical lens; the detection photonic crystal fiber is used for placing a sample to be detected;
the spectrum analyzer is connected with the output end of the detection photonic crystal fiber; the spectrum analyzer is used for analyzing the absorption peak of the transmitted light wave incident into the spectrum analyzer.
Optionally, the wavelength range of the continuous incident light wave is 1300 nm to 3500 nm.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect: the utility model discloses a survey photonic crystal optic fibre and optical fiber sensor, include: optical fiber body and sample tubeA track, a coating film and an air hole. The detection photonic crystal fiber only comprises a sample channel, the inner surface of the sample channel is plated with an indium tin oxide film, air holes filled with liquid to be detected around the sample channel are fiber cores, and the plurality of fiber cores arranged around the sample channel can improve the influence of incident light waves on the effective refractive indexes of the surface plasma body and the fiber core mold, so that the fiber sensor provided with the detection photonic crystal fiber can realize 104The wavelength sensitivity of nm RIU magnitude, the utility model discloses an optical fiber sensor has the high advantage of sensitivity. The coating material selected by the utility model is indium tin oxide, which can reduce the manufacturing cost of the detection photonic crystal fiber and the optical fiber sensor; the optical fiber sensor can also realize the sensing of near-middle infrared and middle infrared wave bands (1400 nm-2800 nm) at the same time, and further expands the application range of the optical fiber sensor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a cross-sectional view of a detection photonic crystal fiber provided in embodiment 1 of the present invention;
fig. 2 is a structural diagram of an optical fiber sensor provided in embodiment 2 of the present invention.
Wherein, 1, the optical fiber main body; 2. a sample channel; 3. coating; 4. an air hole; 5. a first core; 6. a second core; 7. a third core; 8. a fourth core; 9. a light source; 10. a polarizer; 11. a coupling optical lens; 12. detecting a photonic crystal fiber; 13. and (4) a spectrum analyzer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Example 1
This embodiment 1 provides a detection photonic crystal fiber, and fig. 1 is a cross-sectional view of the detection photonic crystal fiber provided in embodiment 1 of the present invention. Referring to fig. 1, the photonic crystal fiber for detection includes: the optical fiber comprises an optical fiber body 1, a sample channel 2, a coating film 3 and an air hole 4.
The substrate material of the fiber body 1 is pure quartz. The cross section of the optical fiber body 1 is circular, and the radius of the optical fiber body 1 is 9.5-11 microns.
The sample channel 2 is arranged inside the optical fiber main body 1, the sample channel 2 and the optical fiber main body 1 are coaxially arranged, and the sample channel 2 is positioned in the center of the optical fiber main body 1; the cross-section of the sample channel 2 is circular and the radius of the sample channel 2 is 1 micrometer. The sample channel 2 is used for placing the liquid to be measured.
The coating film 3 is tightly attached to the inner surface of the sample channel 2, and the material of the coating film 3 is indium tin oxide; the thickness of the coating film 3 is 40 nm to 60 nm. Indium tin oxide with a thickness of 40-60 nm is coated on the inner surface of the sample channel 2, and can be used for generating surface plasma waves.
The air holes 4 are arranged in the optical fiber body 1, the number of the air holes 4 is multiple, the central axes of the air holes 4 are parallel to the central axis of the optical fiber body 1, the cross section of each air hole 4 is circular, and the radius of each air hole 4 is 0.5 micrometer.
A plurality of air holes 4 are arranged in a regular hexagonal pattern around the sample channel 2.
A plurality of air holes 4 are arranged into four layers of regular hexagons, the first layer of regular hexagons uses sample channel 2 as the center to arrange around sample channel 2, the second layer of regular hexagons is arranged outside the first layer of regular hexagons, the third layer of regular hexagons is arranged outside the second layer of regular hexagons, and the fourth layer of regular hexagons is arranged outside the third layer of regular hexagons. The center-to-center spacing between any two adjacent air holes 4 in the plurality of air holes 4 is 1.8 microns to 2.2 microns. The distance between the first layer of regular hexagons and the second layer of regular hexagons is equal to the distance between the second layer of regular hexagons and the third layer of regular hexagons, and the distance is 1.56-1.91 micrometers.
Liquid to be detected is filled in the air holes 4 with the preset number in the regular hexagon of the second layer, the air holes 4 with the preset number in which the liquid to be detected is filled are symmetrically arranged, the radius of the air holes 4 with the preset number in which the liquid to be detected is filled is smaller than that of the air holes 4 which are not filled with the liquid to be detected, and the radius of the air holes 4 with the preset number in which the liquid to be detected is filled is 0.05-0.45 micrometer.
In this embodiment 1, the number of the air holes filled with the liquid to be detected is four, and the four air holes filled with the liquid to be detected are used as four fiber cores of the photonic crystal fiber for detection. In this embodiment 1, the four cores are located above, below, and to the left and right of the sample channel, respectively, i.e., the first core 5 is located above the sample channel, the second core 6 is located below the sample channel, the third core 7 is located to the left of the sample channel, and the fourth core 8 is located to the right of the sample channel.
In the photonic crystal fiber for detection in this embodiment 1, the four fiber cores are located in the second layer of regular hexagon, so that the coupling effect between the surface plasmon mode and the fiber core fundamental mode can be enhanced; the selected coating metal is indium tin oxide, so that the manufacturing cost of the photonic crystal fiber can be reduced.
Example 2
This embodiment 2 provides an optical fiber sensor, and fig. 2 is the structure diagram of the optical fiber sensor provided in embodiment 2 of the present invention. Referring to fig. 2, the optical fiber sensor includes: a light source 9, a polarizer 10, a coupling optical lens 11, a spectrum analyzer 13 and a detection photonic crystal fiber 12 of example 1.
The light source 9 is used to provide a steady output of continuous incident light waves. The wavelength range of the continuous incident light wave is 1300 nm-3500 nm. Light source 9 is preferably an Electro MIR supercontinuum light source from Sino optics.
The polarizer 10 is positioned on a first emergent light path of the light source 9; the polarizer 10 is used to adjust the polarization state of the incident light wave.
The coupling optical lens 11 is positioned on the second emergent light path of the polarizer 10; the coupling optical lens 11 is used to couple the second outgoing optical path to the detection photonic crystal fiber 12.
The detection photonic crystal fiber 12 is positioned on the focal point of the coupling optical lens 11; the detection photonic crystal fiber 12 is used for placing a sample to be detected.
The spectrum analyzer 13 is connected with the output end of the detection photonic crystal fiber 12; the spectrum analyzer 13 is used to analyze the absorption peaks of the transmitted light waves incident into the spectrum analyzer 13 and to monitor the real-time changes of the surface plasmon resonance signal in the photonic crystal fiber 12.
The optical fiber sensor further includes: a fiber clamp (not shown in fig. 2), a three-dimensional fiber alignment jig (not shown in fig. 2), and an optical bench (not shown in fig. 2).
The light source 9, the polarizer 10, the coupling optical lens 11, the spectrum analyzer 13 and the three-dimensional optical fiber adjusting frame are all fixed on an optical platform, and the optical platform is used for fixing the optical fiber sensor.
The detection photonic crystal fiber 12 is put into a fiber clamp to be compressed, and the fiber clamp for clamping the detection photonic crystal fiber 12 is fixed on the three-dimensional fiber adjusting frame. The three-dimensional optical fiber adjusting frame is used for fixing the detection photonic crystal fiber 12 and adjusting the position of the detection photonic crystal fiber 12 in a three-dimensional space.
The working process of the optical fiber sensor in the embodiment 2 is as follows: liquid to be detected is injected into the four fiber cores and the sample channel of the detection photonic crystal fiber by adopting the capillary phenomenon of the liquid, so that the detection photonic crystal fiber and the coupling optical lens are coaxial. The polarizer modulates the incident light into x polarized light, and makes the central axis of the first fiber core of the detection photonic crystal fiber parallel to the polarization direction of the incident light. The first fiber core of the detection photonic crystal fiber is located on the focus of the coupling optical lens, the coupling optical lens efficiently couples incident light into the fiber core of the detection photonic crystal fiber, and a spectrum analyzer at the output end of the detection photonic crystal fiber carries out real-time monitoring.
The working principle of the optical fiber sensor in the embodiment 2 is as follows: when the refractive index of liquid to be detected in the sample channel is reduced, the effective refractive indexes of the surface plasmon mode and the fiber core fundamental modes of the four fiber cores are reduced along with the reduction of the refractive index of the liquid to be detected, but the reduction amplitude of the surface plasmon mode is larger than that of the fiber core fundamental modes, and the coupling resonance wavelength moves towards the short wavelength direction, so that the absorption peak of the transmitted light wave input into the spectrum analyzer generates blue shift. On the contrary, when the refractive index of the sample to be measured is increased, the mode effective refractive index of the surface plasmon mode is increased by a range larger than that of the fiber core fundamental mode, and the coupling resonance wavelength moves towards the long wavelength direction, so that the transmission absorption peak in the spectrum analyzer generates red shift. Therefore, the utility model provides an optical fiber sensor based on survey photonic crystal optic fibre can the change of the sample refracting index that awaits measuring of real-time on-line monitoring.
The optical fiber sensor of the embodiment 2 can simultaneously realize sensing of near-middle infrared and middle infrared bands (1400 nm-2800 nm), and the application range of the optical fiber sensor is expanded.
The utility model discloses four fibre cores that survey photonic crystal optic fibre and plate indium tin oxide sample passageway's structure can improve the influence of incident light wave to the mould effective refractive index of surface plasma phantom and fine mandrel, and then optical fiber sensor can realize 104Wavelength sensitivity on the order of unit refractive index per nanometer (nm/RIU).
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (9)
1. A photonic crystal fiber for detection, comprising: the optical fiber comprises an optical fiber body, a sample channel, a coating film and an air hole;
the sample channel is arranged in the optical fiber main body, the sample channel is coaxially arranged with the optical fiber main body, and the sample channel is positioned in the center of the optical fiber main body; the sample channel is used for placing liquid to be detected;
the coating is tightly attached to the inner surface of the sample channel and is used for generating surface plasma waves;
the air holes are arranged in the optical fiber main body, the number of the air holes is multiple, and the central axes of the air holes are parallel to the central axis of the optical fiber main body;
a plurality of the air holes are arranged around the sample channel in a regular hexagon;
the plurality of air holes are arranged into four layers of regular hexagons, a first layer of regular hexagons is arranged around the sample channel by taking the sample channel as a center, a second layer of regular hexagons is arranged outside the first layer of regular hexagons, a third layer of regular hexagons is arranged outside the second layer of regular hexagons, and a fourth layer of regular hexagons is arranged outside the third layer of regular hexagons;
and filling liquid to be detected in the air holes of the second layer of regular hexagons in the preset number, wherein the air holes of the preset number filled with the liquid to be detected are symmetrically arranged, and the radius of the air holes of the preset number filled with the liquid to be detected is smaller than that of the air holes not filled with the liquid to be detected.
2. The photonic crystal fiber for detection according to claim 1, wherein the substrate material of the fiber body is pure quartz.
3. The photonic crystal fiber for detection according to claim 1, wherein the cross-section of the sample channel is circular and the radius of the sample channel is 1 μm.
4. The photonic crystal fiber for detection according to claim 1, wherein the material of the coating film is indium tin oxide;
the thickness of the coating is 40-60 nm.
5. The photonic crystal fiber for detection according to claim 1, wherein said air holes have a circular cross section and a radius of 0.5 μm.
6. The photonic crystal fiber for detection according to claim 1, wherein the radius of the predetermined number of air holes filled with the liquid to be detected is 0.05-0.45 μm, and the predetermined number is four.
7. The photonic crystal fiber for detection according to claim 1, wherein the cross-section of the fiber body is circular, and the radius of the fiber body is 9.5-11 μm.
8. A fiber optic sensor, comprising: a light source, a polarizer, a coupling optical lens, a spectrum analyzer and a probe photonic crystal fiber according to any one of claims 1 to 7;
the light source is used for providing a continuous incident light wave with stable output;
the polarizer is positioned on a first emergent light path of the light source; the polarizer is used for adjusting the polarization state of the incident light wave;
the coupling optical lens is positioned on a second emergent light path of the polarizer; the coupling optical lens is used for coupling the second emergent light path to the detection photonic crystal fiber;
the detection photonic crystal fiber is positioned on the focus of the coupling optical lens; the detection photonic crystal fiber is used for placing a sample to be detected;
the spectrum analyzer is connected with the output end of the detection photonic crystal fiber; the spectrum analyzer is used for analyzing the absorption peak of the transmitted light wave incident into the spectrum analyzer.
9. The fiber optic sensor of claim 8, wherein the continuous incident light waves have a wavelength in the range of 1300 nm to 3500 nm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112230333A (en) * | 2020-10-29 | 2021-01-15 | 北京邮电大学 | V-shaped dual-core photonic crystal fiber polarization beam splitter with air hole plated with gold film |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112230333A (en) * | 2020-10-29 | 2021-01-15 | 北京邮电大学 | V-shaped dual-core photonic crystal fiber polarization beam splitter with air hole plated with gold film |
| CN112230333B (en) * | 2020-10-29 | 2021-09-17 | 北京邮电大学 | V-shaped dual-core photonic crystal fiber polarization beam splitter with air hole plated with gold film |
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