CN115752796A - Temperature sensor based on eccentric twin-core special optical fiber and preparation method thereof - Google Patents
Temperature sensor based on eccentric twin-core special optical fiber and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a temperature sensor based on a double-core special optical fiber and a preparation method thereof, belonging to the technical field of optical fiber sensing and comprising a single-mode optical fiber, a multimode optical fiber and a double-core optical fiber; one end of the single-mode optical fiber is connected with one end of the multimode optical fiber, and the other end of the multimode optical fiber is connected with one end of the eccentric dual-core optical fiber; the bias double-core optical fiber consists of a first cylindrical structure, a cone structure with the diameter gradually reduced and a second cylindrical structure in sequence; the end part of the second cylindrical structure is provided with a spherical structure which is prepared by the same optical fiber as the second cylindrical structure. The invention utilizes the cone structure with gradually reduced diameter to expose a fiber core of the eccentric twin-core optical fiber, thereby increasing the optical path difference of transmitted light, and the sphere structure realizes secondary interference on the transmitted light, thereby causing the effective refractive index of a transmission mode to change. The temperature sensor has the advantages of compact and novel structure, high sensitivity and great application potential in the field of temperature measurement.
Description
Technical Field
The invention relates to a temperature sensor based on a double-core special optical fiber and a preparation method thereof, belonging to the technical field of optical fiber sensing.
Background
Conventional optical fiber temperature sensors are mainly classified into fiber grating temperature sensors and interference type temperature sensors. The temperature measurement principle of the fiber bragg grating temperature sensor is that a space phase grating is formed on a fiber core of an optical fiber by utilizing the photosensitive characteristic of a fiber material to measure the temperature, and wisdom and the like of the university of Harbin industry in China package FBGs by utilizing a sensitivity-enhancing metal tube, so that the fiber bragg grating is protected, and the sensitivity of the fiber bragg grating is improved; the volatile bin of the university in southeast utilizes the mode that the metal sleeve pipe is combined with polymer to make the temperature sensitivity raise than the ordinary fiber grating by five times; the fiber grating temperature sensor has the advantages of small influence of external factors on the fiber grating temperature sensor in the use process, accurate measurement, high sensitivity and stable performance, but the packaging and signal demodulation process is complex and the manufacturing cost is relatively high, so that the fiber grating temperature sensor needs to be matched with a large instrument for use, and inconvenience is brought to use under certain special conditions.
The interferometric optical fiber temperature sensor belongs to a phase modulation type temperature sensor, and measures temperature mainly by using an interference phenomenon of light and a generated phase difference. Typical interference type optical fiber temperature sensors include a mach-zehnder optical fiber temperature sensor (MZI), a fabry-perot optical fiber temperature sensor (FBI), a sagnac optical fiber temperature sensor, and the like. Zhang et al in 2021 designed a Mach-Zehnder temperature-refractive index dual-parameter sensor based on a coreless-few-mode-coreless structure, and realized that the maximum temperature sensing sensitivity was 0.0739 nm/DEG C; in 2020, sarah et al first proposed an all-fiber temperature sensor using HF to corrode NCF at a corrosion rate of 40%, then coated a layer of copper oxide-polyvinyl alcohol (CuO-PVA) film as a sensitizer in the corroded area, and finally measured that the maximum temperature sensitivity of the sensor is 0.101 nm/DEG C in the range of 25-235 ℃; the optical fiber temperature sensor is a novel temperature sensor, and has the advantages of electromagnetic interference resistance, high pressure resistance, corrosion resistance, explosion and flame resistance, small volume, light weight and the like. However, the sensitivity of a pure optical fiber structure in the existing interference type temperature sensor is low, the improvement of the temperature sensitivity is mostly realized by depending on a temperature sensitive material, the optical fiber temperature sensor which does not depend on the temperature sensitive material but has high sensitivity like a Fabry-Perot structure needs to be prepared under a micro environment, and the preparation process is complex and tedious.
Disclosure of Invention
The invention aims to provide a temperature sensor based on a double-core special optical fiber and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
a temperature sensor based on a partial twin-core special optical fiber comprises: single mode, multimode and polarization twin core fibers; one end of the single-mode optical fiber is connected with one end of the multimode optical fiber, and the other end of the multimode optical fiber is connected with the first cylindrical structure end of the eccentric twin-core optical fiber;
the inclined to one side twin-core optic fibre is including the first cylinder structure, the cone structure and the second cylinder structure that the diameter reduces gradually that connect gradually, another tip of second cylinder structure is provided with the spheroid structure of the same root optic fibre preparation of second cylinder structure.
The technical scheme of the invention is further improved as follows: the single-mode optical fiber comprises a first fiber core and a first cladding wrapped outside the first fiber core, and the first fiber core is positioned in the center of the single-mode optical fiber;
the multimode optical fiber comprises a second fiber core and a second cladding wrapped outside the second fiber core, and the second fiber core is positioned in the center of the multimode optical fiber;
the double-core fiber comprises a third fiber core, a fourth fiber core and a third cladding layer wrapping the third fiber core and the fourth fiber core, the third fiber core is located at the center of the double-core fiber, and the distance between the center of the fourth fiber core and the center of the third fiber core is 42.3 mu m.
The technical scheme of the invention is further improved as follows: and the fourth fiber core is positioned in the part of the second cylindrical structure and is exposed in the air.
The technical scheme of the invention is further improved as follows: the first core radius is 4.5 μm and the first cladding radius is 62.5 μm.
The technical scheme of the invention is further improved as follows: the second core had a radius of 52.5 μm and the second cladding had a radius of 62.5 μm.
The technical scheme of the invention is further improved as follows: the radius of the third core is 4.2 μm and the radius of the fourth core is 3.8 μm.
The technical scheme of the invention is further improved as follows: the diameter of the second cylindrical structure is 60-80 mu m, and the length of the cone structure is 3-5 mm.
The technical scheme of the invention is further improved as follows: the diameter of the sphere structure is 100-200 μm.
A preparation method of a temperature sensor based on a double-core special optical fiber comprises the following steps:
s1, connecting a single-mode optical fiber, a multi-mode optical fiber and a double-core optical fiber in a discharge cascade fusion mode sequentially;
s2, corroding the other end of the eccentric double-core optical fiber through a corrosive solution;
and S3, preparing the corroded end face of the eccentric twin-core optical fiber into a spherical structure in a discharge mode.
The technical scheme of the invention is further improved as follows: the corrosion solution is a 40% HF solution, the immersion length is 3-5 mm, and the immersion time is 30min.
Due to the adoption of the technical scheme, the invention has the following technical effects:
the invention provides a temperature sensor based on a double-core special optical fiber and a preparation method thereof.A cone structure with gradually reduced diameter exposes one fiber core of the double-core optical fiber, so that the optical path difference of transmitted light is increased, and a sphere structure realizes secondary interference on the transmitted light, thereby causing the effective refractive index of a transmission mode to change. The sensor has the advantages of compact and novel structure, high sensitivity and great application potential in the field of temperature measurement.
Drawings
FIG. 1 is a schematic view of the overall structure of the temperature sensor of the present invention;
FIG. 2 is a schematic diagram showing the detailed structure of the temperature sensor according to the present invention;
FIGS. 3a and 3b are schematic diagrams of the apparatus before and after the preparation of the conical structure and the second cylindrical structure of the temperature sensor according to the present invention;
FIG. 4 is a flow chart of the production method of the present invention;
the optical fiber comprises 1 a single-mode optical fiber, 2 a multimode optical fiber, 3a first cylindrical structure, 4 a cone structure, 5 a second cylindrical structure, 6 a spherical structure, 7 a first cladding, 8 a first fiber core, 9 a second cladding, 10 a second fiber core, 11 a third cladding, 12 a fourth fiber core, 13 a third fiber core.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the present invention, the term "and/or" describes an association relationship of an associated object, and indicates that three relationships may exist, for example, a and/or B, and may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The application scenario described in the embodiment of the present invention is for more clearly illustrating the technical solution of the embodiment of the present invention, and does not form a limitation on the technical solution provided in the embodiment of the present invention, and it can be known by a person skilled in the art that with the occurrence of a new application scenario, the technical solution provided in the embodiment of the present invention is also applicable to similar technical problems. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specified.
A temperature sensor based on a bias dual-core special optical fiber, as shown in fig. 1 and 2, comprising: a single mode fiber 1, a multimode fiber 2 and a bias dual-core fiber; one end of the single-mode optical fiber 1 is connected with one end of a multimode optical fiber 2, and the other end of the multimode optical fiber is connected with the end 3 of the first cylindrical structure of the double-core fiber; the single mode optical fiber 1 is used for receiving light emitted by the laser and transmitting the light processed by the sensor to the spectrometer.
The single-mode optical fiber 1 comprises a first fiber core 8 and a first cladding 7 wrapping the first fiber core 8, wherein the first fiber core 8 is located at the center of the single-mode optical fiber 1; the radius of the first core 8 is 4.5 μm and the radius of the first cladding 7 is 62.5 μm.
The multimode optical fiber 2 comprises a second fiber core 10 and a second cladding 9 wrapping the second fiber core 10, wherein the second fiber core 10 is positioned at the central position of the multimode optical fiber 2; the radius of the second core 10 is 52.5 μm and the radius of the second cladding 9 is 62.5 μm.
The eccentric double-core optical fiber comprises a first cylindrical structure 3, a cone structure 4 and a second cylindrical structure 5, wherein the cone structure 4 and the second cylindrical structure 5 are sequentially connected, and the other end of the second cylindrical structure 5 is provided with a sphere structure 6 which is prepared by the same optical fiber as the second cylindrical structure 5. The radius of the first cylindrical structure 3 is 62.5 microns, the diameter of the second cylindrical structure 5 is 60-80 microns, the length of the cone structure 4 is 3-5 mm, and the diameter of the sphere structure 6 is 100-200 microns.
The double-core fiber comprises a third fiber core 13, a fourth fiber core 12 and a third cladding 11 wrapped outside the third fiber core 13 and the fourth fiber core 12, wherein the third cladding 11 forms a first cylindrical structure 3, a cone structure 4 with gradually reduced diameter and a second cylindrical structure 5 outside, the third fiber core 13 is positioned at the center of the double-core fiber, the distance between the center of the fourth fiber core 12 and the center of the third fiber core 13 is 42.3 mu m, the radius of the third fiber core 13 is 4.2 mu m, and the radius of the fourth fiber core 12 is 3.8 mu m; the fourth core 12 is exposed to air at a portion of the second cylindrical structure 5.
A method for manufacturing a temperature sensor based on a dual-core special optical fiber, as shown in fig. 4, includes the following steps:
s1, connecting the single-mode optical fiber 1, the multimode optical fiber 2 and the eccentric dual-core optical fiber in sequence in a discharge cascade welding mode
Before the single-mode optical fiber 1, the multimode optical fiber 2 and the bias double-core optical fiber are discharged through the fusion equipment, the optical fiber coating layer with a preset distance at one end is removed, and the preset distance is determined by a person skilled in the art according to actual conditions. And then, cutting the end face of one end with the coating removed, and placing the end with the coating removed, of the single-mode optical fiber 1 and the multimode optical fiber 2, on an optical fiber fusion splicer, so that the end face of the optical fiber is aligned with the electrode rod for discharge fusion splicing, wherein the discharge intensity and the discharge time are respectively 120bit and 3000ms. Similarly, the other end of the multimode optical fiber 2 and the polarization dual-core optical fiber perform the same operations as described above.
S2, corroding the other end of the eccentric twin-core optical fiber through a corrosive solution to obtain a second cylinder and a cone structure with gradually reduced diameter
Taking the end of the bias double-core optical fiber which is not welded with a length of 2cm, removing the coating layer, flattening the end face, and wiping the end face clean by alcohol cotton; then the glass is immersed into a 40% HF solution for 30min, wherein the immersion length is 3-5 mm. And after the corrosion is finished, taking out the optical fiber, soaking the optical fiber in alcohol for 20min to wash away the corrosive solution attached to the surface of the optical fiber, and naturally drying the optical fiber to obtain the second cylinder 5 and the cone structure 4 with the diameter gradually reduced. Fig. 3a and 3b are schematic diagrams of the device before and after the preparation of the conical structure and the second cylindrical structure of the temperature sensor, respectively. The etching solution may be, but is not limited to, a hydrofluoric acid solution having a concentration of 40%.
S3, preparing the corroded end face of the eccentric twin-core optical fiber into a spherical structure 6 in a discharge mode
And (3) putting the second cylinder 5 and the cone structure 4 with the diameter gradually reduced obtained in the step (S2) into welding equipment, aligning the end face of the optical fiber with the electrode rod, pushing the eccentric twin-core optical fiber to the side without the optical fiber by 30 microns, and discharging to obtain a spherical structure, wherein the discharge intensity and the discharge time are respectively 80bit and 3000ms, so as to obtain the temperature sensor.
The following steps are introduced for performing a temperature sensing experiment by a temperature sensor and obtaining spectral data:
fixing a temperature sensor on a glass plate, placing the glass plate into a temperature control box, transmitting a single-mode jumper wire out of the temperature control box, connecting the single-mode jumper wire with a fiber grating demodulator, opening a switch of the temperature control box, and recording spectrogram data every 5 ℃ from 25-100 ℃. In the temperature sensor structure, light beams enter the multimode optical fiber from the single-mode optical fiber jumper at the input end, and the second fiber core of the multimode optical fiber has larger diameter, so that the light transmitted by the single-mode optical fiber jumper can be transmitted into the two fiber cores of the double-core fiber, and the multimode optical fiber plays a role of light beam expansion. Because the two fiber cores of the double-core fiber are far away from each other, the generated weak coupling phenomenon can be ignored, when light enters the double-core fiber, the light is transmitted in the two fiber cores, the light transmitted in the fourth fiber core is reflected by the corroded conical structure, part of the light returns in the original path, and the other part of the fiber is lost in the air; and light transmitted in the third fiber core reaches the spherical structure, interferes with light transmitted in the third cladding, returns along the original path, generates Michelson interference at each path of light at the welding position of the multimode fiber and the partial double-core fiber, and finally returns to the position of a single-mode fiber jumper at the input end to output an interference spectrum by a fiber grating demodulator. Due to the action of corroding the conical structure and the spherical structure, the optical path difference is generated in the transmission process of the two beams of light in the eccentric double-core optical fiber, so that the temperature can be measured.
The invention provides a temperature sensor based on a double-core deflection special optical fiber, wherein the double-core deflection optical fiber utilizes a cone structure with gradually reduced diameter to expose a fiber core of the double-core deflection optical fiber, so that the optical path difference of transmitted light is increased, and a sphere structure realizes secondary interference on the transmitted light, thereby causing the effective refractive index of a transmission mode to change. The temperature sensor has the advantages of compact and novel structure, high sensitivity and great application potential in the field of temperature measurement.
Claims (10)
1. A temperature sensor based on a double-core special optical fiber is characterized by comprising: the optical fiber comprises a single-mode optical fiber (1), a multimode optical fiber (2) and a bias double-core optical fiber; one end of the single-mode optical fiber (1) is connected with one end of a multimode optical fiber (2), and the other end of the multimode optical fiber (2) is connected with the end of a first cylindrical structure (3) of the eccentric twin-core optical fiber;
the inclined to one side double-core optical fiber comprises a first cylindrical structure (3), a cone structure (4) and a second cylindrical structure (5), wherein the cone structure (4) and the second cylindrical structure (5) are sequentially connected, the diameter of the cone structure is gradually reduced, and the other end portion of the second cylindrical structure (5) is provided with a sphere structure (6) which is made of the same optical fiber as the second cylindrical structure (5).
2. The temperature sensor based on the eccentric dual-core special optical fiber as claimed in claim 1, wherein: the single-mode optical fiber (1) comprises a first fiber core (8) and a first cladding (7) wrapping the first fiber core (8), wherein the first fiber core (8) is located at the central position of the single-mode optical fiber (1);
the multimode optical fiber (2) comprises a second fiber core (10) and a second cladding (9) wrapped outside the second fiber core (10), and the second fiber core (10) is located in the center of the multimode optical fiber (2);
the double-core fiber comprises a third fiber core (13), a fourth fiber core (12) and a third cladding (11) wrapping the third fiber core (13) and the fourth fiber core (12), wherein the third fiber core (13) is located at the center of the double-core fiber, and the distance between the center of the fourth fiber core (12) and the center of the third fiber core (13) is 42.3 mu m.
3. The temperature sensor based on the eccentric dual-core special optical fiber as claimed in claim 2, wherein: the fourth fiber core (12) is exposed in the air at the part of the second cylindrical structure (5).
4. The temperature sensor based on the eccentric dual-core special optical fiber as claimed in claim 3, wherein: the radius of the first core (8) is 4.5 μm, and the radius of the first cladding (7) is 62.5 μm.
5. The temperature sensor based on the eccentric dual-core special optical fiber as claimed in claim 3, wherein: the radius of the second core (10) is 52.5 mu m, and the radius of the second cladding (9) is 62.5 mu m.
6. The temperature sensor based on the eccentric dual-core special optical fiber as claimed in claim 3, wherein: the radius of the third fiber core (13) is 4.2 μm, and the radius of the fourth fiber core (12) is 3.8 μm.
7. The temperature sensor based on the eccentric dual-core special optical fiber as claimed in claim 3, wherein: the diameter of the second cylindrical structure (5) is 60-80 mu m, and the length of the cone structure (4) is 3-5 mm.
8. The temperature sensor based on the eccentric dual-core special optical fiber as claimed in claim 3, wherein: the diameter of the spherical structure (6) is 100-200 mu m.
9. The method for preparing the temperature sensor based on the double-core special optical fiber according to any one of claims 1 to 8, which is characterized by comprising the following steps: the method comprises the following steps:
s1, connecting a single-mode optical fiber (1), a multimode optical fiber (2) and a double-core fiber in a discharge cascade welding mode sequentially;
s2, corroding the other end of the eccentric twin-core optical fiber through a corrosive solution;
and S3, preparing the corroded end face of the eccentric twin-core optical fiber into a spherical structure (6) in a discharge mode.
10. The method for manufacturing the temperature sensor based on the eccentric dual-core special optical fiber according to claim 9, wherein the method comprises the following steps: the corrosion solution is a 40% HF solution, the immersion length is 3-5 mm, and the immersion time is 30min.
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| US20020191911A1 (en) * | 2001-06-15 | 2002-12-19 | Ljerka Ukrainczyk | Tapered lensed fiber for focusing and condenser applications |
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| CN108387173A (en) * | 2018-04-04 | 2018-08-10 | 南京信息工程大学 | A kind of ultra-compact all -fiber Mach-Zehnder interferometer and preparation method thereof |
| CN109520968A (en) * | 2019-01-16 | 2019-03-26 | 南昌航空大学 | A kind of micro-nano fiber biosensor of exception welding structure |
| CN111412938A (en) * | 2020-04-29 | 2020-07-14 | 南京信息工程大学 | Three-parameter measurement mixed structure interferometer sensor |
| CN216348697U (en) * | 2021-12-22 | 2022-04-19 | 黑龙江大学 | Optical fiber Michelson interferometer based on end face microsphere structure |
-
2022
- 2022-11-02 CN CN202211367414.9A patent/CN115752796B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020191911A1 (en) * | 2001-06-15 | 2002-12-19 | Ljerka Ukrainczyk | Tapered lensed fiber for focusing and condenser applications |
| CN101887147A (en) * | 2010-06-11 | 2010-11-17 | 哈尔滨工程大学 | Four-core fibre combined optical tweezer and grating power control method thereof |
| CN101907742A (en) * | 2010-06-21 | 2010-12-08 | 哈尔滨工程大学 | Array optical tweezers based on multicore polarization-preserving fiber and manufacturing method thereof |
| CN108387173A (en) * | 2018-04-04 | 2018-08-10 | 南京信息工程大学 | A kind of ultra-compact all -fiber Mach-Zehnder interferometer and preparation method thereof |
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Effective date of registration: 20240621 Address after: 5 / F, 277 Huqingping Road, Minhang District, Shanghai, 201100 Patentee after: Shanghai Pengsi Optoelectronic Technology Co.,Ltd. Country or region after: China Address before: 066004 No. 438, Hebei Avenue, seaport District, Hebei, Qinhuangdao Patentee before: Yanshan University Country or region before: China |