CN219675124U - Micro-fiber semi-coupling reflective probe structure based on refractive index sensing - Google Patents
Micro-fiber semi-coupling reflective probe structure based on refractive index sensing Download PDFInfo
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- CN219675124U CN219675124U CN202321119438.2U CN202321119438U CN219675124U CN 219675124 U CN219675124 U CN 219675124U CN 202321119438 U CN202321119438 U CN 202321119438U CN 219675124 U CN219675124 U CN 219675124U
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- 238000010168 coupling process Methods 0.000 title claims abstract description 70
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 70
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- 229920001410 Microfiber Polymers 0.000 title claims abstract description 31
- 239000003658 microfiber Substances 0.000 title claims abstract description 31
- 239000000835 fiber Substances 0.000 claims abstract description 48
- 239000013307 optical fiber Substances 0.000 claims abstract description 39
- 230000008878 coupling Effects 0.000 claims description 27
- 238000005520 cutting process Methods 0.000 claims description 5
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- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000003287 optical effect Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 12
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- 238000005259 measurement Methods 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 2
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- 238000003756 stirring Methods 0.000 description 1
- 238000002198 surface plasmon resonance spectroscopy Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model relates to a micro-fiber semi-coupling reflective probe structure based on refractive index sensing. At present, the manufacturing of the optical fiber sensor is high in cost and complex in manufacturing process. Furthermore, most fiber-coupled sensors operate in a transmission mode, in which the light source and detector are separated at both ends. A micro-fiber semi-coupling reflective probe, comprising: the optical source is connected with a first port of the micro-optical fiber semi-coupling reflection type probe (3) structure through a leading-in single-mode optical fiber (2), the spectrometer is connected with a second port of the micro-optical fiber semi-coupling reflection type probe structure through a leading-out single-mode optical fiber (4), light emitted by the optical source is input through the first port, and partial light reflection returns along an original path when transmitted to the end face of the micro-optical fiber semi-coupling reflection type probe structure and is transmitted out through the second port. The utility model is applied to the technical field of optical fiber sensing.
Description
Technical Field
The utility model relates to the technical field of optical fiber sensing, in particular to a micro-optical fiber semi-coupling reflective probe structure based on refractive index sensing.
Background
Many fiber optic devices for refractive index measurement have been proposed and demonstrated, such as fiber interferometers, fiber Bragg gratings, long period fiber gratings, special optical transmission devices, whispering gallery mode optical resonators, surface plasmon resonance devices, single mode multimode single mode devices, photonic crystal fiber sensors, and fused fiber directional couplers. In general, these fiber optic devices have compact size, high sensitivity, and quick response. Furthermore, fiber optic directional couplers can also be used as sensors because the optical coupling depends on the surrounding environment. For example, fiber optic couplers have been demonstrated for sensing force, temperature, current, magnetic field, and refractive index.
However, the optical fiber sensor is expensive to manufacture and the manufacturing process is complicated. Furthermore, most fiber-coupled sensors operate in a transmission mode, in which the light source and detector are separated at both ends. The fabrication of fiber-coupled sensors by means of a Sagnac loop allows the input and output ports to be located on a single end, but still requires a fixed tapered waist region to prevent bending thereof, which can create large, sometimes unpredictable variations in the coupling region, making interpretation of the sensor signal difficult.
Disclosure of Invention
The utility model aims to provide a micro-fiber semi-coupling reflective probe structure based on refractive index sensing.
The above object is achieved by the following technical scheme:
a micro-optical fiber semi-coupling reflective probe structure based on refractive index sensing comprises the following components: the light source and the spectrometer are respectively arranged at one end of the detection structure, the light source is connected with the first port of the micro-optical fiber semi-coupling reflection type probe structure through leading-in a single-mode fiber, the spectrometer is connected with the second port of the micro-fiber semi-coupling reflective probe structure through the single-mode optical fiber, light emitted by the light source is input through the first port, and partial light reflection returns along the original path when transmitted to the end face of the micro-fiber semi-coupling reflective probe structure and is transmitted out through the second port.
The micro-fiber half-coupling reflective probe structure based on refractive index sensing is formed by cutting a symmetrical coupling region formed by fusion tapering coupling between the middle part of a first coupling single-mode fiber and the middle part of a second coupling single-mode fiber.
The refractive index sensing-based micro-fiber semi-coupling reflective probe structure is characterized in that two optical fibers of a coupling area of the micro-fiber semi-coupling reflective probe structure are nearly arranged in parallel, and the waist cone diameter of the micro-fiber semi-coupling reflective probe structure is 7 mu m and the length of the waist cone is 1-2cm.
The refractive index sensing-based micro-fiber semi-coupling reflective probe structure comprises a lead-in single-mode fiber and a lead-out single-mode fiber, wherein the diameters of fiber cores/cladding layers of the lead-in single-mode fiber and the lead-out single-mode fiber are 8.3/125 mu m.
The optical fiber half-coupling reflective probe structure based on refractive index sensing is characterized in that the light source is an ASE broadband light source.
The beneficial effects achieved by the utility model are as follows:
1. the utility model uses the all-fiber structure to conduct sensing, and has the advantages of electromagnetic interference resistance, electric insulation, high quality factor, narrow bandwidth, high sensitivity, small volume, light weight, flexible and changeable appearance structure, strong adaptability, wide application range, high reliability and the like. Meanwhile, the method has the advantage of reflection mode operation and can be used for in-situ chemical and biological sensing.
2. Compared with a coupler sensor based on a transmission mode, the sensor provided by the utility model has the advantages that the reflection-based probe can detect the refractive index of a sample through a small single-point insertion, and a plurality of unpredictable changes caused by the waist cone bending of the optical fiber coupler are avoided.
3. The utility model has the advantages of reflection mode operation and small size, is simple to manufacture, can greatly reduce the manufacturing cost by using a single-mode fiber, and can solve the unpredictable change caused by the bending of the waist cone diameter, so that the structure can be widely applied to various fields of building health monitoring, mine detection, in-situ chemical and biological sensing and the like.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model.
In the drawings:
FIG. 1 is a schematic diagram of the structure of the present utility model;
1. the optical fiber coupling reflection type optical fiber probe comprises a light source, a lead-in single-mode fiber, a micro-optical fiber semi-coupling reflection type probe structure, a lead-out single-mode fiber, a spectrometer, a 3-1 port, a first port, a 3-2 port and a second port.
Detailed Description
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
Example 1:
referring to fig. 1, a micro-fiber semi-coupling reflective probe structure based on refractive index sensing is provided. The optical fiber coupling reflection type optical fiber coupling probe comprises a light source 1, a leading-in single-mode optical fiber 2, a micro-optical fiber semi-coupling reflection type probe structure 3, a leading-out single-mode optical fiber 4 and a spectrometer 5 which are sequentially connected.
A micro-optical fiber semi-coupling reflective probe structure based on refractive index sensing comprises the following components: the light source and the spectrometer are respectively arranged at one end of the detection structure, the light source is connected with the first port of the micro-optical fiber semi-coupling reflection type probe structure through leading-in a single-mode fiber, the spectrometer is connected with the second port of the micro-fiber semi-coupling reflective probe structure through the single-mode optical fiber, light emitted by the light source is input through the first port, and partial light reflection returns along the original path when transmitted to the end face of the micro-fiber semi-coupling reflective probe structure and is transmitted out through the second port. The micro-fiber half-coupling reflective probe structure is formed by cutting a symmetrical coupling area formed by the middle part of a first coupling single-mode fiber and the middle part of a second coupling single-mode fiber through fusion tapering coupling. The two optical fibers of the combining area are approximately arranged in parallel, and the waist cone of the micro-fiber semi-coupling reflective probe structure is approximately 7 mu m in diameter and 1-2cm in length. The refractive index sensing-based micro-fiber semi-coupling reflective probe structure comprises a lead-in single-mode fiber and a lead-out single-mode fiber, wherein the diameters of fiber cores/cladding layers of the lead-in single-mode fiber and the lead-out single-mode fiber are 8.3/125 mu m. The optical fiber half-coupling reflective probe structure based on refractive index sensing is characterized in that the light source is an ASE broadband light source. The micro-optical fiber half-coupling reflection type probe structure comprises a micro-optical fiber half-coupling reflection type probe structure formed by using a ruby cutter to vertically align a symmetrical coupling area formed by coupling the middle part of a first coupling single-mode fiber and the middle part of a second coupling single-mode fiber which are adsorbed in a displacement platform groove of a cone pulling machine for cutting.
Example 2:
a preparation method of a micro-fiber half-coupler based on refractive index sensing, wherein the sensor is the sensor, and comprises the following steps:
selecting two standard single-mode fibers, stripping the coating layer at the middle part, wiping the coating layer, stirring the coating layer removed part for a plurality of circles in a double-screw mode, and adsorbing the coating layer removed part in a displacement platform of a tapering machine for tapering. After the tapering is finished, the micro-fiber coupler is obtained, a ruby cutter is used for vertically aligning and cutting the center part of the coupling area of the micro-fiber coupler adsorbed in the displacement platform groove of the tapering machine, and the flatness of the end surface is ensured as much as possible;
the light source 1, the imported single-mode fiber 2 and the light are sequentially connected, the light is input through the first port 3-1, partial light reflection returns along the original path when the light is transmitted to the end face of the probe, the light is transmitted out through the second port 3-2, and the single-mode fiber 4 and the spectrometer 5 are exported.
The application of the micro-fiber semi-coupling reflective probe structure based on refractive index sensing applies the sensor to the measurement of refractive index sensitivity.
Example 3:
in some embodiments of the utility model, the measurement of refractive index sensitivity comprises the steps of:
the light source 1 is turned on, the light signal emitted by the light source 1 is transmitted to the spectrometer 5 through the lead-in single-mode fiber 2, the micro-fiber half coupler 3 and the lead-out single-mode fiber 4 in sequence, the sensor is completely immersed in the glycerol aqueous solution, the concentration of the solution is changed by adding glycerol, and the reflection spectrum under different refractive indexes is obtained. The length of the drawing cone is about 25000 mu m, and the drawing cone speed is adjusted to be 100 mu m/s. The sensing area is the tip of the probe structure, and the micro-optical fiber semi-coupling reflective probe structure is easily influenced by the external environment, so that the refractive index can be measured. The light enters port 3-1 and is partially coupled to another optical fiber, while the rest of the light continues to propagate in the original optical fiber. Then, at the cut end of the fiber coupler, the separate two beams are partially reflected, travel back, and pass through the coupling region again. Based on the reciprocity of light propagation, a half-coupler can be modeled as a full coupler, reflecting port output power as a function of wavelength, refractive index, port cross-sectional diameter, and coupling region length. The fiber tapering speed was kept constant and the tapering length was kept around 25000 μm.
Example 4:
experimental analysis of the refractive index sensing system of this example included the following steps.
In some embodiments of the utility model, an ASE broadband light source with a wavelength range of 1525-1610nm is used in the sensing device, and an Agilent 86142B type spectrometer (with a wavelength resolution of 0.06 nm) is used in the detection section. Fixing the micro-fiber semi-coupling reflective probe structure on a glass slide, calibrating the refractive index of a glycerol aqueous solution by using an Abbe refractometer, dripping the glycerol aqueous solution on the micro-fiber semi-coupling reflective probe structure, and performing refractive index sensing intensity test by taking 0.001 as a counting unit within the range of 1.335-1.355 to obtain reflection spectrograms under different refractive indexes, wherein the intensity of interference fringes is obviously changed.
Claims (4)
1. A micro-optical fiber semi-coupling reflective probe structure based on refractive index sensing comprises the following components: the light source and the spectrometer are respectively arranged at one end of the detection structure, and the light source and the spectrometer are characterized in that: the light source is connected with a first port of the micro-optical fiber semi-coupling reflective probe structure through a leading-in single-mode fiber, the spectrometer is connected with a second port of the micro-optical fiber semi-coupling reflective probe structure through a leading-out single-mode fiber, light emitted by the light source is input through the first port, and partial light reflection returns along an original path when transmitted to the end face of the micro-optical fiber semi-coupling reflective probe structure and is transmitted out through the second port;
the micro-fiber half-coupling reflective probe structure is formed by cutting a symmetrical coupling area formed by the middle part of a first coupling single-mode fiber and the middle part of a second coupling single-mode fiber through fusion tapering coupling.
2. The refractive index sensing-based micro-fiber semi-coupled reflective probe structure according to claim 1, wherein: the coupling conditions of the two optical fibers of the coupling region of the micro-fiber half-coupling reflective probe structure are nearly parallel, and the waist cone of the micro-fiber half-coupling reflective probe structure has a diameter of 7 mu m and a length of 1-2cm.
3. The refractive index sensing-based micro-fiber semi-coupled reflective probe structure according to claim 1, wherein: the diameter of the fiber core/cladding of the leading-in single-mode fiber and the leading-out single-mode fiber is 8.3/125 mu m.
4. The refractive index sensing-based micro-fiber semi-coupled reflective probe structure according to claim 1, wherein: the light source is an ASE broadband light source.
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| CN202321119438.2U CN219675124U (en) | 2023-04-28 | 2023-04-28 | Micro-fiber semi-coupling reflective probe structure based on refractive index sensing |
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| CN202321119438.2U CN219675124U (en) | 2023-04-28 | 2023-04-28 | Micro-fiber semi-coupling reflective probe structure based on refractive index sensing |
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- 2023-04-28 CN CN202321119438.2U patent/CN219675124U/en active Active
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