CN212568471U - Double-channel optical fiber SPR sensor - Google Patents
Double-channel optical fiber SPR sensor Download PDFInfo
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- CN212568471U CN212568471U CN202021095458.7U CN202021095458U CN212568471U CN 212568471 U CN212568471 U CN 212568471U CN 202021095458 U CN202021095458 U CN 202021095458U CN 212568471 U CN212568471 U CN 212568471U
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Abstract
The utility model discloses a binary channels optic fibre SPR sensor, including corroding single mode fiber, two multimode fiber, corrode single mode fiber and include single mode fiber fibre core and the single mode fiber transparent covering of parcel in the single mode fiber fibre core outside, single mode fiber transparent covering includes the first transparent covering corresponding to the middle predetermined area of single mode fiber fibre core, and be located the second transparent covering of first transparent covering both sides, the external diameter of second transparent covering is greater than the external diameter of first transparent covering, the periphery cladding of first transparent covering has metal film, first transparent covering, the metal film of cladding at first transparent covering surface, and the single mode fiber fibre core of first transparent covering cladding constitutes the district that corrodes single mode sensing fiber, the both sides end connection that corrodes single mode fiber has multimode fiber; the utility model provides a binary channels SPR sensor cost of manufacture is low, easy operation, sensitivity are high, can be used to the detection to the liquid refracting index.
Description
Technical Field
The utility model relates to an optical fiber sensor technical field, concretely relates to binary channels optic fibre SPR sensor.
Background
The sensitivity of the traditional optical fiber sensor is low, and the sensitivity of the optical fiber sensor can be improved by several orders of magnitude by a Surface Plasmon Resonance (SPR) sensor. The optical fiber SPR sensor can realize multi-channel detection by utilizing the difference of different metal resonance wavelengths. In order to realize the SPR effect of evanescent wave excitation coating metal, methods such as tapering, polishing and grinding are designed to enable light in a fiber core to enter a cladding, so that the SPR effect is easy to generate, but the tapering and polishing operation processes are complicated, and the use of various machines is involved, so that the structure of the conventional optical fiber SPR sensor is complicated and the sensitivity is low. .
SUMMERY OF THE UTILITY MODEL
The utility model aims at: the double-channel optical fiber SPR sensor has high sensitivity, multi-channel detection and simple structure.
The technical scheme is as follows: the double-channel optical fiber SPR sensor provided by the scheme comprises a corroded single-mode optical fiber and two multimode optical fibers;
each multimode fiber comprises a multimode fiber core and a multimode fiber transparent cladding wrapped on the periphery of the multimode fiber core; the corrosion single-mode fiber comprises a single-mode fiber core and a single-mode fiber transparent cladding wrapped on the periphery of the single-mode fiber core; the single-mode optical fiber transparent cladding comprises a first transparent cladding corresponding to a middle preset section of a single-mode optical fiber core and second transparent claddings respectively corresponding to sections on two sides of the middle section; the outer diameter of the second transparent cladding layer is larger than that of the first transparent cladding layer; the periphery of the first transparent cladding is coated with a metal film;
the two second transparent claddings and the single-mode optical fiber core part coated by the second transparent claddings form a transmission single-mode optical fiber positioned at two ends in the corrosion single-mode optical fiber; the single-mode optical fiber comprises a first transparent cladding, a metal film coated on the outer surface of the first transparent cladding, and a single-mode optical fiber core part coated by the first transparent cladding, wherein a sensing area positioned in the middle of a single-mode corrosion optical fiber is formed;
the radius of the fiber core of the single mode fiber is smaller than that of the fiber core of the multimode fiber, and the outer side ends of the two transmission single mode fibers are connected with any end of the two multimode fibers in a one-to-one correspondence manner; the multimode fiber core and the single mode fiber core are coaxially arranged.
The outer diameter of the transparent cladding of the multimode optical fiber is equal to the outer diameter of the second transparent cladding.
The metal film comprises a gold film and a silver film; the edge of the gold film is connected with the edge of the silver film, the gold film and the silver film are connected and integrally coated on the outer surface of the first transparent coating, and the edge of the butt joint of the gold film and the silver film penetrates through and corrodes two ends of a sensing area in the single mode fiber.
The gold film and the silver film each coat a half region of the first transparent clad layer.
The multimode optical fiber and the transmission single-mode optical fiber are connected in a fusion mode.
The length of each multimode optical fiber is 5-8cm, the length of each transmission single-mode optical fiber is 1-2cm, and the length of the sensing area is 1-2 cm.
Has the advantages that: compared with the prior art, the dual-channel optical fiber SPR sensor provided by the utility model is made of two types of optical fibers, and the material cost is low; the corroded part is respectively coated with a gold film and a silver film, so that double-channel detection can be formed, and the measuring range is increased; the corrosion enables more light in the cladding to generate evanescent waves to participate in the excitation of SPR, so that the sensitivity of the sensor is higher.
Drawings
FIG. 1 is a longitudinal cross-sectional view of a dual channel fiber SPR sensor provided in accordance with an embodiment of the present invention;
FIG. 2 is a model diagram of a dual channel fiber SPR sensor provided in accordance with embodiments of the present invention;
FIG. 3 is a schematic diagram of a system test of a dual channel fiber SPR sensor according to embodiments of the present invention;
FIG. 4 is a measured spectrum of a dual channel fiber SPR sensor according to embodiments of the present invention for different liquid refractive indices;
in the figure: 1. a multimode optical fiber transparent cladding; 2. a second transparent cladding layer; 3. a first transparent cladding layer; 4. gold film; 5. a silver film; 6. a multimode optical fiber; 101. a multimode optical fiber core; 102. a single mode fiber core; 7. a halogen tungsten lamp; 8. a first external transmission multimode optical fiber; 9. a dual-channel fiber SPR sensor; 10. a micro fiber optic spectrometer; 11. a second external transmission multimode optical fiber; 12. a computer terminal; 13. and a USB data line.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, the terms "left", "right", "up", "down", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for convenience of description of the present invention rather than requiring the present invention to be necessarily constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The utility model provides a double-channel optical fiber SPR sensor, which comprises an input multimode optical fiber, a corrosion single mode optical fiber and an output multimode optical fiber from left to right in sequence, referring to fig. 1 and 2;
the input multimode fiber and the output multimode fiber are multimode fibers 6, the two multimode fibers comprise a multimode fiber core 101 and a multimode fiber transparent cladding 1, and the multimode fiber transparent cladding 1 is wrapped on the periphery of the multimode fiber core 101.
The corrosion single-mode fiber sequentially comprises a transmission single-mode fiber, a sensing area and a transmission single-mode fiber from left to right; the corroded single-mode fiber comprises a single-mode fiber core 102 and a single-mode fiber transparent cladding wrapped on the periphery of the single-mode fiber core 102; the single-mode optical fiber transparent cladding comprises a first transparent cladding 3 positioned in the middle area of the single-mode optical fiber transparent cladding and second transparent cladding 2 positioned on two sides of the first transparent cladding 3; the outer diameter of the second transparent cladding layer 2 is larger than that of the first transparent cladding layer 3, and the outer surface of the first transparent cladding layer 3 is coated with a metal film; since the outer diameters of the second transparent claddings 2 at both ends are larger than the outer diameter of the first transparent cladding 3 at the middle region, the middle region forms a recessed region with respect to the regions at both ends; in one embodiment, a part of the transparent cladding of a middle preset area of a section of single-mode optical fiber transparent cladding is removed by an etching method to form an etched single-mode optical fiber, the part of the single-mode optical fiber transparent cladding which is not etched at two ends in the etched single-mode optical fiber is a second transparent cladding 2, and the part of the middle area which is etched and has an outer diameter smaller than that of the second transparent cladding 2 is a first transparent cladding 3;
namely: the transmission single-mode fiber comprises two second transparent claddings 2 positioned at two ends of the transmission single-mode fiber and single-mode fiber cores 102 corresponding to the second transparent claddings 2, and the transmission single-mode fiber positioned at two ends of the corrosion single-mode fiber is formed by the two second transparent claddings 2 and the single-mode fiber cores 102 covered by the second transparent claddings 2; the transmission single-mode fiber further comprises a single-mode fiber core 102 area corresponding to the first transparent cladding 3 and the first transparent cladding 3, a metal film coated on the outer surface of the first transparent cladding 3, and the single-mode fiber core 102 part coated by the first transparent cladding 3, so as to form a sensing area located in the middle of the single-mode corrosion fiber;
the radius of the single-mode optical fiber core 102 is smaller than that of the multimode optical fiber core 101, the outer ends of the two transmission single-mode optical fibers are correspondingly connected with the ends of any side of the two multimode optical fibers one by a fusion welding method, and the multimode optical fiber core 101 is coaxial with the single-mode optical fiber core 102; the outer diameter of the transparent cladding 1 of the multimode optical fiber is equal to the outer diameter of the second transparent cladding 2. When connecting two multimode fiber and corruption single mode fiber, multimode fiber and the coating that corrodes single mode fiber have all been got rid of, and the section of optical fiber link has all cut levelly and smoothly to the sanitization, when carrying out the butt fusion on the heat sealing machine, the machine can be automatic the axle center of two sections optic fibre cores of the most accurate butt fusion, and the alignment degree is better, and the transmission loss of light is lower.
The metal thin films coated on the periphery of the first transparent cladding 3 are a gold film 4 and a silver film 5, the edge of the gold film 4 is connected with the edge of the silver film 5, the gold film 4 and the silver film 5 are connected and integrally coated on the outer surface of the first transparent cladding 3, and the edge of the butt joint of the gold film 4 and the silver film 5 penetrates through and corrodes two ends of a sensing area in the single-mode optical fiber. (ii) a In one embodiment, the gold film 4 and the silver film 5 coat the upper half and the lower half, respectively, of the first transparent clad layer 3; when the gold film 4 and the silver film 5 do not completely cover the first transparent cladding 3 corresponding to the sensing region, or the gold film 4 and the silver film 5 are partially overlapped, the function of the dual-channel fiber SPR sensor 8 can be realized, but the resolution is lower than that of the dual-channel fiber SPR sensor 8 in which the gold film 4 and the silver film 5 respectively cover the upper half portion and the lower half portion of the first transparent layer.
In one embodiment, referring to fig. 1 and 2, the multimode optical fiber on the left side is an input multimode optical fiber with a length of 5-8 cm; the right multimode fiber is an output multimode fiber, and the length of the output multimode fiber is 5-8 cm; corroding the transmission single mode fiber at two ends of the single mode fiber, wherein the length of the transmission single mode fiber is 1-2 cm; the length of the sensing area corresponding to the middle groove area is 1-2 cm; the length of the gold film 4 and the silver film 5 wrapped on the groove is 1-2 cm.
The utility model provides a binary channels optic fibre SPR sensor adopts multimode optic fibre-corrodes single mode fiber-multimode fiber's structure, include that the light that sends halogen tungsten lamp carries out the multimode fiber of input, will evanescent field reinforcing and take place the corruption single mode fiber of SPR effect and the multimode fiber with spectral output. Light emitted by the halogen tungsten lamp enters the corrosion single-mode fiber through the input multi-mode fiber, and due to the size mismatch of the fiber cores of the multi-mode fiber and the single-mode fiber, the light in the fiber core of the multi-mode fiber enters the cladding of the single-mode fiber to excite the SPR effect. After the SPR effect is generated, strong resonance absorption peaks are generated at two wavelengths of original transmitted light, the effective refractive index of the metal film is changed along with the change of the external refractive index, but the effective refractive index of the fiber core is basically unchanged, the difference value of the effective refractive indexes is increased, and the resonance peaks are subjected to red shift, so that the purpose of detecting the liquid refractive index is achieved; the sensitivity of the traditional optical fiber sensor is lower, and the dual-channel optical fiber SPR sensor provided by the utility model improves the sensitivity of the sensor by coating a layer of metal film on the first transparent cladding region; the multichannel detection can be realized according to the difference of the resonance wavelengths of the coated gold film and the coated silver film; it is further advantageous to use erosion and core mismatch techniques to excite the SPR effect.
Referring to fig. 3, the dual-channel optical fiber SPR sensor 9 provided by the present invention is used for testing the refractive index of the liquid:
the environmental temperature for measuring the refractive index of the liquid is controlled to be 25 ℃, the liquid to be measured is dripped into a sensing area of a dual-channel optical fiber SPR sensor 9, a halogen tungsten lamp 7 is switched on, light of 360nm-2000nm emitted by light beams is input into an input multimode optical fiber through an external first external transmission multimode optical fiber 8 and then input into the sensing area through a transmission single mode optical fiber 6, and the light entering a cladding of the corrosion single mode optical fiber is subjected to SPR reaction with a silver film 5 and a gold film 4. The spectrum after the SPR reaction is input to the miniature fiber spectrometer 10 via the output multimode fiber 6 and the second external transmission multimode fiber 11. The result obtained by the micro fiber spectrometer 10 is transmitted to the computer end 12 through the USB data line 13, and the data is processed to obtain the data to be measured. And after one group of data is measured, cleaning the sensing area by using deionized water, airing, and continuing to measure the next group of data. The increase of the refractive index of the external liquid to be measured can cause the effective refractive index of the metal film to also increase, the effective refractive index of the fiber core is basically unchanged, the difference value of the refractive indexes is increased, the resonance peak is subjected to red shift, and the obtained spectrogram is shown in fig. 4.
The final choice of the fitting by sensitivity was 1907nm/RIU using silver channels in the refractive index range 1.31-1.36 and 3007.6nm/RIU using gold channels in the refractive index range 1.36-1.39.
The dual-channel optical fiber SPR sensor provided by the utility model is made of two types of optical fibers, and the material cost is low; the corroded transparent cladding part is coated with a metal film comprising a gold film 4 and a silver film 5, so that double-channel detection can be formed, and the measuring range of the double-channel detection is increased; the corrosion enables more light in the cladding to generate evanescent waves to participate in the excitation of SPR, so that the sensitivity of the sensor is higher.
The above is only the preferred embodiment of the present invention, the present invention provides a dual-channel fiber SPR sensor, wherein the metal film covered by the sensing region includes but not limited to the gold film 4 and the silver film 5, and also can be a high refractive index material whose other refractive index can change with the change of the incident light wavelength, for those skilled in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A dual-channel optical fiber SPR sensor is characterized by comprising a corroded single-mode optical fiber and two multimode optical fibers;
each multimode fiber comprises a multimode fiber core (101) and a multimode fiber transparent cladding (1) wrapped on the periphery of the multimode fiber core (101); the corroded single-mode optical fiber comprises a single-mode optical fiber core (102) and a single-mode optical fiber transparent cladding wrapped on the periphery of the single-mode optical fiber core (102); the single-mode optical fiber transparent cladding comprises a first transparent cladding (3) corresponding to a middle preset section of a single-mode optical fiber core (102) and second transparent claddings (2) corresponding to sections on two sides of the middle section respectively; the outer diameter of the second transparent cladding (2) is larger than that of the first transparent cladding (3); the periphery of the first transparent cladding (3) is coated with a metal film;
the two second transparent claddings (2) and the single-mode fiber cores (102) covered by the second transparent claddings (2) form transmission single-mode fibers positioned at two ends of the corrosion single-mode fiber; the sensing area is positioned in the middle of the single-mode corrosion optical fiber and comprises a first transparent cladding (3), a metal film coated on the outer surface of the first transparent cladding (3) and a single-mode optical fiber core (102) part coated by the first transparent cladding (3);
the radius of the single-mode optical fiber core (102) is smaller than that of the multimode optical fiber core (101), and the outer side ends of the two transmission single-mode optical fibers are connected with any end of the two multimode optical fibers in a one-to-one correspondence manner; the multimode optical fiber core (101) and the single-mode optical fiber core (102) are coaxially arranged.
2. The dual channel fiber SPR sensor of claim 1 wherein said multimode fiber transparent cladding (1) has an outer diameter equal to an outer diameter of said second transparent cladding (2).
3. The dual channel fiber SPR sensor of claim 1, wherein said metal thin film comprises a gold film (4) and a silver film (5); the edge of the gold film (4) is connected with the edge of the silver film (5), the gold film (4) and the silver film (5) are connected and integrally coated on the outer surface of the first transparent cladding (3), and the edge of the gold film (4) which is butted with the silver film (5) penetrates through and corrodes two ends of a sensing area in the single-mode optical fiber.
4. The dual channel fiber SPR sensor of claim 3, wherein said gold film (4) and said silver film (5) each coat half of the area of said first transparent cladding (3).
5. The dual channel fiber SPR sensor of any one of claims 1 to 4 wherein said multimode optical fiber and said transmission single mode optical fiber are connected by fusion splicing.
6. The dual channel fiber SPR sensor of any one of claims 1 to 4 wherein each multimode optical fiber has a length of 5 to 8cm, each transmission single mode optical fiber has a length of 1 to 2cm and the sensing region has a length of 1 to 2 cm.
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| CN202021095458.7U CN212568471U (en) | 2020-06-15 | 2020-06-15 | Double-channel optical fiber SPR sensor |
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| CN202021095458.7U CN212568471U (en) | 2020-06-15 | 2020-06-15 | Double-channel optical fiber SPR sensor |
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