CN210375164U - Dislocation interference sensor based on intermode interference - Google Patents
Dislocation interference sensor based on intermode interference Download PDFInfo
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- CN210375164U CN210375164U CN201921665722.3U CN201921665722U CN210375164U CN 210375164 U CN210375164 U CN 210375164U CN 201921665722 U CN201921665722 U CN 201921665722U CN 210375164 U CN210375164 U CN 210375164U
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- polarization maintaining
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- maintaining fiber
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Abstract
The utility model provides a dislocation interference sensor based on interference between mould, include: single mode fiber and polarization maintaining fiber, single mode fiber sets up the both ends of polarization maintaining fiber optic fibre, polarization maintaining fiber is located between two single mode fiber and radially sets up downwards along single mode fiber, make to be the ladder structure of straying between single mode fiber and the polarization maintaining fiber, polarization maintaining fiber can used repeatedly, and single mode fiber sets up the both ends of polarization maintaining fiber, it is the ladder structure of straying to make between single mode fiber and the polarization maintaining fiber, the sensitivity of dislocation interference sensor has been showing to be improved, and simultaneously, moreover, the steam generator is simple in structure, can use repeatedly, and high repeatability, and can practice thrift the cost.
Description
Technical Field
The utility model relates to an optical fiber sensor technical field, concretely relates to dislocation interference sensor based on interference between moulds.
Background
Intermodal interference is a common interference phenomenon. The method is characterized in that beam splitting and beam combining of incident light are respectively realized at the front position and the rear position of the same optical fiber, and when the incident light and the beam combining meet the phase difference, interference fringes are generated, so that the measurement of the external physical environment is realized.
The Mach-Zehnder interferometer is a sensor based on the principle of two-beam interference, where light is split into a measurement arm and a reference arm by some means, and then they are combined together, where the interference phenomenon can be formed by measurement. The sensing measurement of physical quantities such as temperature, refractive index, bending and the like is realized through interference phenomenon.
The Mach-Zehnder interferometers are further classified into a conventional type and an embedded type. And the optical fiber dislocation welding belongs to an embedded Mach-Zehnder interferometer. The embedded Mach-Zehnder interferometer leads the fiber core light to enter the cladding layer to realize the excitation of a cladding layer mode in a dislocation mode, after the light enters the optical fiber, the fiber core becomes a measuring arm, the cladding layer becomes a reference arm, and interference fringes are formed through the difference of modes.
A polarization maintaining fiber is an optical fiber that amplifies the birefringence of light and is also called a sensitivity enhancing fiber. When light passes through the polarization maintaining fiber, the light is divided into a fast axis and a slow axis, and the dispersion generated in the conventional single mode fiber can be reduced by the transmission of the fast axis and the slow axis. Polarization maintaining optical fibers are commonly used in sensors to serve to increase the sensitivity of the sensor. The polarization maintaining fiber can form a micro-nano high birefringent fiber through tapering, and is generally applied to a Sagnac interferometer.
SUMMERY OF THE UTILITY MODEL
In order to solve the lower problem of current optic fibre dislocation butt fusion sensitivity, for this reason, the utility model provides a dislocation interference sensor based on interference between the mould, include: the single mode fiber and the polarization maintaining fiber are arranged at two ends of the polarization maintaining fiber, the polarization maintaining fiber is located between the two single mode fibers and is arranged downwards along the radial direction of the single mode fibers, and a stepped staggered structure is formed between the single mode fibers and the polarization maintaining fiber.
Preferably, the length of the polarization maintaining fiber is 9-10 mm.
Preferably, the single-mode fiber is fused to both ends of the polarization maintaining fiber, so that the single-mode fiber and the polarization maintaining fiber have a stepped staggered structure.
Preferably, the offset distance is 1/4 of the radius of the polarization maintaining fiber, and the offset distance is the perpendicular distance from the polarization maintaining fiber along the end face where the single mode fiber and the polarization maintaining fiber are welded.
Preferably, the optical power loss of the staggered structure between the single-mode fiber and the polarization maintaining fiber is 30 dB.
Preferably, the polarization maintaining fiber is a tapered polarization maintaining fiber, and the upper edge and the lower edge of the middle part of the polarization maintaining fiber are recessed towards the central axis.
Preferably, the taper length of the polarization maintaining optical fiber is 10-15 mm.
Drawings
Fig. 1 shows a schematic structural diagram of a misalignment interference sensor according to an embodiment of the invention;
fig. 2 is a schematic structural framework diagram of a method for manufacturing a misalignment interference sensor according to an embodiment of the present invention; (ii) a
Fig. 3 shows measured spectral plots of a displaced interference sensor according to an embodiment of the invention;
fig. 4 shows a sensitivity linear fit curve before tapering of a misaligned interferometric sensor according to an embodiment of the invention;
fig. 5 shows a sensitivity linear fit curve after tapering of a misaligned interferometric sensor according to an embodiment of the invention;
wherein: 1. a single mode optical fiber; 2. a polarization maintaining fiber.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A misalignment interference sensor based on inter-mode interference according to some embodiments of the present invention is described below with reference to fig. 1 to 5.
In the embodiment of the present invention, as shown in fig. 1, the utility model provides a dislocation interference sensor based on interference between moulds, include: single mode fiber 1 and polarization maintaining fiber 2, single mode fiber 1 sets up the both ends of polarization maintaining fiber 2 optic fibre, and polarization maintaining fiber 2 is located between two single mode fiber 1 and radially sets up downwards along single mode fiber 1, makes to be the ladder structure of straying between single mode fiber 1 and the polarization maintaining fiber 2.
In this embodiment, polarization maintaining fiber 2 can be used repeatedly, and single mode fiber 1 is disposed at both ends of polarization maintaining fiber 2, and polarization maintaining fiber 2 is located between two single mode fibers 1 and is disposed downward along single mode fiber 1 radial direction, and is connected with two single mode fibers 1, so that two single mode fibers 1 and polarization maintaining fiber 2 are in a stepped staggered structure, thereby significantly improving the sensitivity of the staggered interference sensor, and simultaneously, the structure is simple, can be used repeatedly, has strong repeatability, and can save cost.
In one embodiment of the present invention, the length of the polarization maintaining fiber 2 is preferably 9-10 mm.
In this embodiment, the length of the polarization maintaining fiber 2 is 9-10mm, and the number of the wave troughs on the spectrometer is moderate, so that the wave trough drift degree can be conveniently detected and observed. Meanwhile, the sensitivity of the dislocation interference sensor is high.
In an embodiment of the present invention, preferably, as shown in fig. 1, the single-mode fiber 1 is fused to both ends of the polarization maintaining fiber 2, so that the single-mode fiber 1 and the polarization maintaining fiber 2 have a stepped structure.
In this embodiment, utilize the heat sealing machine like japanese gulhe S117 heat sealing machine, with the both ends of two single mode fiber 1 butt fusion polarization maintaining optical fiber 2, adopt the butt fusion mode, make the optical fiber connection loss low, safe and reliable receives external factor to influence for a short time, the specific model of equipment is only for the example, not only is limited the utility model discloses. .
In an embodiment of the present invention, preferably, the offset distance is 1/4 of the radius of the polarization maintaining fiber 2, and the offset distance is the perpendicular distance from the polarization maintaining fiber 2 along the end surface of the single mode fiber 1 to the polarization maintaining fiber 2.
In this embodiment, the misalignment distance is 1/4 of the radius of the polarization maintaining fiber 2, the depth of the wave trough of the spectrometer is moderate at this time, the wavelength value of the light source corresponding to the wave trough at this time can be rapidly detected by the spectrometer, and meanwhile, the sensitivity of the misalignment interference sensor is high.
In an embodiment of the present invention, preferably, the optical power loss of the misclassification structure between the single-mode fiber 1 and the polarization maintaining fiber 2 is 30 dB.
In this embodiment, the optical power loss of the staggered structure between the single mode fiber 1 and the polarization maintaining fiber 2 is 30dB, and the staggered fusion splicing is successful.
In an embodiment of the present invention, preferably, as shown in fig. 1, the polarization maintaining fiber 2 is a tapered polarization maintaining fiber 2, and the upper edge and the lower edge of the middle portion of the polarization maintaining fiber 2 are recessed toward the central axis.
In this embodiment, utilize the tapering machine, for example the tapering machine of model IPCS-5000 is to the polarization maintaining fiber tapering, when polarization maintaining fiber 2 is tapered, because its radius reduces, increase the birefringence effect and the big evanescent field effect of polarization maintaining fiber 2 itself, and then improve the different influences of sensor to the medium refracting index of the surrounding to increase sensitivity, the specific model of equipment is only for the example, not only is limited the utility model discloses.
In one embodiment of the present invention, the tapered length of the polarization maintaining fiber 2 is preferably 10-15 mm.
In the embodiment, the taper length of the polarization maintaining optical fiber 2 is 10-15mm, and the sensitivity of the dislocation interference sensor is high.
The utility model provides a dislocation interference sensor based on interference between mould, its preparation method is: firstly, a section of polarization maintaining optical fiber 2 with the thickness of about 10mm is cut, and the middle part of the polarization maintaining optical fiber 2 is stretched by 10-15mm by using a tapering machine. And then carrying out dislocation fusion on the single-mode optical fiber 1 and the polarization maintaining optical fiber 2 twice by using a fusion splicer, wherein the dislocation distance is 1/4 of the radius of the polarization maintaining optical fiber 2, the dislocation distance is less than 1/4 of the radius of the polarization maintaining optical fiber, and the wave trough is not obvious. As shown in fig. 2, after the dislocation fusion is completed, two ends of the dislocation interference sensor are connected to the spectrometer and the light source, the spectrometer adopts a japanese river AQ6375B spectrometer, the light source is a marine optics hl2000HP, the dislocation interference sensor is fixed on the glass slide and directly put into clear water for detection, and the detection is performed by using a computer for analysis, if the spectrometer displays obvious interference fringes, the manufacturing is successful, the specific model of the device is only an example, and the device is not limited to the utility model.
The dislocation interference sensor is researched, a light source with the wavelength range of 1525-. A sodium chloride salt solution having a refractive index varying in the range of 1.3310-1.3370 was prepared, and the refractive index value thereof was measured by Abbe refractometer. In the measurement, a finite element analysis method was used for analysis.
As shown in FIG. 3, the resonance valley drifts to the right and then settles at a fixed value over a range of index changes 1.3320-1.3370. When external refractive index changes, the wavelength at which the spectral wave trough on the spectrometer is located can drift, the refractive index of the solution can be measured by detecting the wavelength value at which the wave trough is located, the drift amount of the wave trough and the change amount of the refractive index are in a linear relation, the linear slope fitted by the drift amount of the wave trough and the change amount of the refractive index is sensitivity, the higher the sensitivity is, the higher the drift amount of the wave trough is, and the better the detection accuracy is. As shown in fig. 4, it can be seen from the fact that y is 574.336x +821.90, the sensitivity of the polarization maintaining fiber 2 is only 574.336nm/RIU when it is not tapered. After tapering, as shown in fig. 5, as y is 14407.0992+9656x, the sensitivity can be increased to 9656nm/RIU, and the sensitivity is greatly improved.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In the present disclosure, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be used in any one or more embodiments or examples.
Claims (7)
1. A misalignment interference sensor based on intermodal interference, comprising: the single mode fiber and the polarization maintaining fiber are arranged at two ends of the polarization maintaining fiber, the polarization maintaining fiber is located between the two single mode fibers and is arranged downwards along the radial direction of the single mode fibers, and a stepped staggered structure is formed between the single mode fibers and the polarization maintaining fiber.
2. The positional interference sensor of claim 1, wherein the polarization maintaining fiber has a length of 9-10 mm.
3. The interferometric sensor of claim 2, wherein the single-mode fiber is fused to both ends of the polarization maintaining fiber, such that the single-mode fiber and the polarization maintaining fiber have a stepped configuration.
4. The shearing interference sensor of claim 3, wherein the shearing distance is 1/4 of the radius of the polarization maintaining fiber, and the shearing distance is a perpendicular distance from the polarization maintaining fiber to the upper edge of the end face of the single mode fiber spliced with the polarization maintaining fiber.
5. The shearing interference sensor of claim 4, wherein the optical power loss of the shearing structure between the single mode fiber and the polarization maintaining fiber is 30 dB.
6. The shearing interference sensor of any one of claims 1-5, wherein the polarization maintaining fiber is a tapered polarization maintaining fiber, and the upper and lower edges of the middle portion of the polarization maintaining fiber are recessed toward the central axis.
7. The shearing interference sensor of claim 6, wherein the tapered length of the polarization maintaining fiber is 10-15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921665722.3U CN210375164U (en) | 2019-09-30 | 2019-09-30 | Dislocation interference sensor based on intermode interference |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921665722.3U CN210375164U (en) | 2019-09-30 | 2019-09-30 | Dislocation interference sensor based on intermode interference |
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| CN210375164U true CN210375164U (en) | 2020-04-21 |
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| CN201921665722.3U Expired - Fee Related CN210375164U (en) | 2019-09-30 | 2019-09-30 | Dislocation interference sensor based on intermode interference |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595518A (en) * | 2019-09-30 | 2019-12-20 | 东北大学 | Dislocation interference sensor based on intermode interference and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595518A (en) * | 2019-09-30 | 2019-12-20 | 东北大学 | Dislocation interference sensor based on intermode interference and preparation method thereof |
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