CN114235754A - Optical fiber SPR sensor with temperature compensation based on capillary tube - Google Patents
Optical fiber SPR sensor with temperature compensation based on capillary tube Download PDFInfo
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- CN114235754A CN114235754A CN202111555937.1A CN202111555937A CN114235754A CN 114235754 A CN114235754 A CN 114235754A CN 202111555937 A CN202111555937 A CN 202111555937A CN 114235754 A CN114235754 A CN 114235754A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 68
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000010931 gold Substances 0.000 claims abstract description 14
- 229910052737 gold Inorganic materials 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 239000010453 quartz Substances 0.000 claims abstract description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005253 cladding Methods 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 239000000523 sample Substances 0.000 claims description 17
- 239000000835 fiber Substances 0.000 claims description 14
- 238000005498 polishing Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 239000002105 nanoparticle Substances 0.000 claims description 2
- 239000004205 dimethyl polysiloxane Substances 0.000 abstract description 8
- 235000013870 dimethyl polysiloxane Nutrition 0.000 abstract description 8
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 abstract description 8
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 abstract description 8
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000004927 fusion Effects 0.000 abstract 1
- 238000002198 surface plasmon resonance spectroscopy Methods 0.000 description 38
- 238000006073 displacement reaction Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- 238000000411 transmission spectrum Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013308 plastic optical fiber Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- G01N21/55—Specular reflectivity
- G01N21/552—Attenuated total reflection
- G01N21/553—Attenuated total reflection and using surface plasmons
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
An optical fiber SPR sensor with temperature compensation based on capillary belongs to the technical field of optical fiber sensing; the device comprises a light source 1, a light injection optical fiber 2, a sensing area 3, a light receiving optical fiber 4, a spectrometer 5 and a computer 6; the light injection optical fiber and the light collection optical fiber are quartz multimode optical fibers 7 which are respectively connected with two ends of a capillary tube 8 through a fusion splicer, the other two ends of the optical fiber are connected with a light source and a spectrometer, 50nm gold films are plated on the upper surface and the lower surface of the capillary tube which is laterally thrown to a hollow core, PDMS is placed on the upper surface, the lower surface of the capillary tube is contacted with liquid to be detected with different refractive indexes, the light generates SPR effect on a capillary tube cladding and a metal interface, the SPR effect is generated by the liquid to be detected and the PDMS with different refractive indexes, and the refractive index of the liquid to be detected with temperature compensation can be detected. The invention can be used for measuring the refractive index of liquid with temperature compensation, and can be widely applied to the fields of biosensing, environmental monitoring and the like.
Description
(I) technical field
The invention belongs to the technical field of optical fiber sensing, and particularly relates to an optical fiber SPR sensor with temperature compensation based on a capillary tube.
(II) background of the invention
Measurement of refractive index plays an important role in many applications including medical diagnostics, environmental monitoring, and food safety. Surface Plasmon Resonance (SPR) is a very sensitive technique that can detect small changes in refractive index, and can further measure changes in physical quantities such as temperature and pressure by measuring changes in refractive index. Compared with the traditional prism-based SPR sensor, the optical fiber-based SPR sensor has the advantages of small volume, low cost and easy manufacture. At present, the existing optical fiber SPR sensors have various types and different structures.
The capillary tube is a simple cylindrical light guide structure, consists of a hollow part and a quartz tube wall, and is equivalent to an optical fiber in size and material. In the capillary, surface plasmon resonance can be easily excited without performing complicated operations. And considering that temperature factors may influence the sensor measurement, a sensor with temperature compensation is important. The chinese invention patent of patent application No. 202011304034.1, "SPR sensor with large measurement range for temperature compensation and method for manufacturing and using" provides an SPR sensor with large measurement range for temperature compensation, but this structure adopts multiple optical fibers such as coaxial double waveguide fiber, eccentric three-core fiber, multimode fiber, etc., and is difficult to process, complex in structure and high in cost. The chinese invention patent "capillary structure localized surface plasmon resonance biochemical sensor" of patent application No. 201810784994.9 provides a capillary structure localized surface plasmon resonance biochemical sensor, but this structure does not have temperature compensation, and will affect the measurement result. The chinese invention patent "a capillary surface plasmon resonance sensor" of patent application No. 201210097543.0 provides a capillary surface plasmon resonance sensor, and this structure also has no temperature compensation. Therefore, it is very important to develop an SPR sensor with simple structure and fabrication process, low cost and temperature compensation.
Disclosure of the invention
In view of the above problems, the present invention provides an optical fiber SPR sensor with temperature compensation using a quartz multimode fiber and a quartz capillary. In contrast to the plastic optical fiber, in the capillary, the surface plasmon resonance can be easily excited without performing a complicated operation.
In order to realize the SPR sensor with temperature compensation, the invention provides a side-polishing structure optical fiber probe, and as a first aspect of the invention, a preparation method of a capillary-based optical fiber SPR sensor with temperature compensation is provided, which comprises the following steps of S1: and removing the coating layer of the capillary tube by a burning method, and welding the two ends of the capillary tube to the multimode optical fiber by a welding machine. S2: and placing the welded optical fiber on an optical fiber bracket, and fixing the optical fiber through a clamp so that the optical fiber is kept in a tight state. And adhering the abrasive paper on the rotating wheel, and performing side polishing on the optical fiber through the rotation of the rotating wheel. The rotating wheel is fixed on a displacement platform, the displacement platform can move in the three-dimensional direction through the air, and the movement of the displacement platform can further drive the grinding wheel to move; the side throw depth and the side throw length are controlled by controlling the displacement length of the grinding wheel through a computer. S3: the upper surface and the lower surface of the capillary are coated by adopting an ion sputtering mode, and the coating quality and the film thickness are controlled by adjusting parameters such as time, current, distance, vacuum degree and the like of an ion sputtering instrument.
The invention provides an optical fiber SPR sensor with temperature compensation based on a capillary tube, which is characterized by comprising a light source 1, a light injection optical fiber 2, a sensing area 3, a light receiving optical fiber 4, a spectrometer 5 and a computer 6, wherein the capillary tube 8 is laterally polished to a hollow part, a 50nm gold film is plated on the upper surface and the lower surface of the capillary tube, the light injection optical fiber and the light receiving optical fiber are multimode quartz optical fibers 7, and the multimode quartz optical fibers are respectively welded at the left end and the right end of the capillary tube through a welding machine and are used for connecting the light source and the spectrometer.
The present invention may further comprise:
1. the cladding diameter of the light injection optical fiber and the light receiving optical fiber is 125 micrometers, the core diameter is 62.5 micrometers, one end of the light injection optical fiber is connected with a light source, and the other end of the light injection optical fiber and the other end of the light receiving optical fiber are welded with a capillary.
2. The light source is a halogen lamp light source, the wavelength is 360-2500 nm, the spectrometer is a visible light spectrometer, and the measurement waveband is 300-1100 nm.
3. The capillary is a quartz capillary, the diameter of the cladding is 125 mu m, and the diameter of the fiber core is 30 mu m.
4. The side-throwing depth of the capillary optical fiber probe can be adjusted by adjusting the rotating speed and the side-throwing time of the side-throwing machine, and the length of a side-throwing area can be controlled by the displacement of the throwing wheel.
5. The side polishing depth of the capillary optical fiber probe is 48-60 mu m, and the length of a side polishing area is 5-8 mm.
6. The metal film material is gold nanoparticles, and the thickness of the metal film material is 50 nm.
The principle of the invention is that light rays are totally reflected at the side polished surface of a capillary tube, evanescent waves enter a gold film and resonate with surface plasma waves at a specific wavelength at an interface of the gold film and a medium to be measured, the energy of the evanescent waves is coupled into the surface plasma waves, and a loss peak appears in a transmission spectrum at the specific wavelength; the wavelength position of the resonance peak changes along with the change of the external refractive index, and the refractive index can be measured by monitoring the wavelength displacement of the resonance peak. Meanwhile, the gold films are plated on the upper surface and the lower surface of the capillary optical fiber probe, and the refractive indexes of PDMS and a medium to be measured are greatly different, so that resonance peaks can be generated at different wavelength positions, two resonance peaks can appear in the monitored transmission spectrum, the measurement of two parameters can be realized by measuring the displacement of the two resonance peaks, the peak related to the refractive index of PDMS is changed along with the temperature, and the optical fiber SPR sensing with temperature compensation is realized.
Compared with the prior art, the invention has the following advantages:
1) the optical fiber SPR sensing probe has the advantages of simple preparation process, low cost and easy commercial production;
2) the optical fiber SPR sensing probe adopts the capillary tube, so that the surface plasma resonance can be easily excited without complex operation, a metal layer is close to a core as much as possible in space, and the problems of complex manufacture and structural instability in other chemical/physical treatment optical fiber structures are solved;
3) the film coating positions of the optical fiber SPR sensing probe are positioned at the same position, so that the length of a device is shortened, and the integration level is high;
4) the optical fiber SPR sensor realizes optical fiber SPR sensing with temperature compensation.
(IV) description of the drawings
FIG. 1 is a schematic diagram of the structure of a capillary-based fiber SPR sensor of the present invention with temperature compensation.
FIG. 2 is a cross-sectional view of a capillary sensing probe in a capillary based fiber SPR sensor of the present invention with temperature compensation.
FIG. 3 is a schematic representation of the simulation results of a capillary based fiber SPR sensor of the present invention with temperature compensation.
(V) detailed description of the preferred embodiments
For the purpose of promoting a better understanding of the objects and advantages of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings, which are not intended to limit the scope of the invention, but rather to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Referring to fig. 1, the invention provides an optical fiber SPR sensor with temperature compensation by using a capillary, which comprises a light source 1, a light injection optical fiber 2, a sensing area 3, a light receiving optical fiber 4, a spectrometer 5 and a computer 6. The optical fiber probe has symmetrical structure, and the light source may be connected to any end of the optical fiber probe via optical fiber and the other end of the optical fiber probe is connected to the spectrometer. When the optical fiber sensing probe is in work, light emitted by the light source 1 reaches the capillary optical fiber sensing probe 3 of the side polishing structure through the light injection optical fiber 2, when the optical fiber sensing probe 3 is immersed in a solution, an optical signal is influenced by the solution to be measured, the modulated optical signal is transmitted to the spectrometer 5 through the light receiving optical fiber 4, and a result of the modulated optical signal is displayed in the computer 6. The quartz multimode fiber 7 adopted by the invention has the cladding diameter of 125 mu m and the fiber core diameter of 62.5 mu m; the diameter of a cladding layer of the adopted capillary tube 8 is 125 mu m, the diameter of a hollow part of the capillary tube is 30 mu m, the side polishing depth of the capillary tube is 48-60 mu m, and the length of a side polishing area is 5-8 mm.
Referring to FIG. 2, there is shown a cross-sectional view of a capillary sensing probe in a capillary based fiber SPR sensor of the present invention with temperature compensation. The capillary is laterally polished to the hollow position, PDMS 11 is placed on the upper surface of the cladding 10 plated with a gold film 12, and the lower surface is also plated with a gold film 9. When the light reaches the capillary and is totally reflected, evanescent waves enter the gold film 9 and the gold film 12, surface plasma waves are generated at the interface of the gold film 12 and the PDMS 11, the two waves resonate, and the transmission spectrum is attenuated at a specific wavelength; the same phenomenon occurs in the gold film 9 and the medium to be measured. Because the refractive index range of PDMS and the refractive index range of the liquid to be measured are not interfered with each other, two SPR peaks are displayed. The refractive index can be measured by calculating the relationship between the displacement amount and the refractive index variation amount of the two SPR peaks, and the calculation method is as follows:
wherein Δ λaAnd Δ λbThe variation of the wavelength of the two resonance peaks, the K sensitivity coefficient, the delta T and the delta n are variation of the value to be measured respectively.
Referring to FIG. 3, a schematic representation of the results of a simulation of a capillary sensing probe in a capillary based fiber SPR sensor of the present invention with temperature compensation is shown. Corresponding simulation calculation is carried out according to a metal Drude model and a Fresnel formula, two SPR peaks appear in a transmission spectrum in a simulation result, the resonance peak 13 corresponds to an SPR effect generated by liquid to be measured, and the resonance peak 14 corresponds to the SPR effect generated by PDMS, so that optical fiber SPR sensing with temperature compensation is realized.
Claims (4)
1. An optical fiber SPR sensor with temperature compensation based on a capillary tube is characterized by comprising a light source 1, a light injection optical fiber 2, a sensing area 3, a light receiving optical fiber 4, a spectrometer 5 and a computer 6, wherein the capillary tube 8 is laterally thrown to a hollow part, a 50nm gold film is plated on the upper surface and the lower surface of the capillary tube, the light injection optical fiber and the light receiving optical fiber are quartz multimode optical fibers 7, and the quartz multimode optical fibers are respectively welded at the left end and the right end of the capillary tube through a welding machine and are used for connecting the light source and the spectrometer.
2. The light injecting fiber and the light collecting fiber as claimed in claim 1, wherein the cladding diameter is 125 μm, the core diameter is 62.5 μm, one end is connected to the light source, and the other end is connected to the capillary.
3. The capillary of claim 1 being a quartz capillary, the cladding diameter being 125 μm and the hollow core diameter being 30 μm.
4. The capillary optical fiber probe of claim 1, wherein the lateral polishing depth is 48-60 μm, the length of the lateral polishing area is 5-8 mm, and the metal film material is gold nanoparticles with a thickness of 50 nm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111555937.1A CN114235754A (en) | 2021-12-18 | 2021-12-18 | Optical fiber SPR sensor with temperature compensation based on capillary tube |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111555937.1A CN114235754A (en) | 2021-12-18 | 2021-12-18 | Optical fiber SPR sensor with temperature compensation based on capillary tube |
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| CN114235754A true CN114235754A (en) | 2022-03-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115290604A (en) * | 2022-07-18 | 2022-11-04 | 桂林电子科技大学 | Refractive index sensor with temperature compensation function based on double-D-type structure |
| CN115825005A (en) * | 2022-09-26 | 2023-03-21 | 哈尔滨工程大学 | Method for rapidly measuring and calculating liquid refractive index based on micro-fluidic chip |
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2021
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115290604A (en) * | 2022-07-18 | 2022-11-04 | 桂林电子科技大学 | Refractive index sensor with temperature compensation function based on double-D-type structure |
| CN115290604B (en) * | 2022-07-18 | 2024-05-03 | 桂林电子科技大学 | Refractive index sensor with temperature compensation function based on double-D structure |
| CN115825005A (en) * | 2022-09-26 | 2023-03-21 | 哈尔滨工程大学 | Method for rapidly measuring and calculating liquid refractive index based on micro-fluidic chip |
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Application publication date: 20220325 |