CN114894225A - Distributed optical fiber sensor based on optical fiber microbend technology and manufacturing method - Google Patents
Distributed optical fiber sensor based on optical fiber microbend technology and manufacturing method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/268—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light using optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
- G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
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Abstract
The invention relates to the technical field of distributed optical fiber sensors, and the scheme is a distributed optical fiber sensor based on an optical fiber microbend technology and a manufacturing method thereof.A plurality of bending parts are arranged on a single optical fiber, and exciting light overflowing from the loss of the bending parts is utilized to stimulate a diamond NV color center, so that the distributed sensing of the surrounding environment is realized; compared with the prior art, the sensing optical fiber is easy to manufacture and convenient to produce practically, the exciting effect of the exciting light on the diamond NV color centers is strong, and the detection precision can be improved.
Description
Technical Field
The invention relates to the technical field of distributed optical fiber sensors, in particular to a distributed optical fiber sensor based on an optical fiber microbend technology and a manufacturing method of a sensing bending part.
Background
In recent years, the measurement technology using optical fiber as the sensing element has become a research hotspot in the current sensing technology. With the emergence of a great number of optical fiber devices, a method for sensing magnetic fields, temperatures and the like by using optical fibers and optical fiber devices is receiving more and more attention. In the prior art, the sensing technology using optical fiber-quantum dot combination is not few, but generally only single-point sensing can be performed, that is, only one point position on one optical fiber can be measured, distributed measurement cannot be realized, and the use has limitations.
Chinese patent publication No. CN114413944A discloses a distributed optical fiber sensor based on quantum dots, which includes a trigger source, a sensing optical fiber and a processing terminal; the sensing optical fiber is provided with a plurality of groups of detection regions, quantum dots are arranged in the optical fiber of the detection regions, and a photoelectric detection assembly is arranged at a position close to the quantum dots; compared with the prior art, the invention has the advantages that the multiple quantum dot detection regions are arranged on the same optical fiber, and each detection region is respectively provided with the photoelectric detection assembly, so that the sensing function at multiple positions is realized; according to the invention, the light filtering structure is arranged between the adjacent detection regions, so that mutual interference of fluorescence generated at different quantum dots can be avoided, the accuracy of sensing detection is ensured, and the fluorescence generated by the quantum dots can be efficiently gathered to the photoelectric detection assembly through the arranged light gathering connector, so that the accuracy of sensing is further improved. However, the quantum dots in the sensing optical fiber are positioned inside the fiber core, and the manufacturing difficulty of the sensing structure is high, so that the sensing structure is not beneficial to actual production.
Based on the above, the invention designs a distributed optical fiber sensor based on an optical fiber microbend technology and a manufacturing method thereof, so as to solve the above problems.
Disclosure of Invention
The invention provides a distributed optical fiber sensor based on an optical fiber microbend technology and a manufacturing method thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
a distributed optical fiber sensor based on an optical fiber microbend technology comprises a trigger front end, a sensing optical fiber and a processing terminal:
the trigger front end comprises a trigger light part, and the trigger light part is used for generating trigger light and coupling the trigger light into the sensing optical fiber;
the sensing optical fiber comprises a plurality of groups of bending parts, the bending parts are bare optical fibers, diamond NV color centers are arranged on the surface of the bare optical fiber, the bending loss occurs at the bending parts after the trigger light enters the sensing optical fiber, the bending loss enables the trigger light to overflow from the fiber core and excite the diamond NV color centers, and the diamond NV color centers generate stress fluorescence under the action of the trigger light and surrounding environment factors;
the processing terminal comprises a plurality of groups of photoelectric detectors, each photoelectric detector is arranged near each bending part and used for receiving stress fluorescence generated by the NV color center of the diamond and transmitting fluorescence information to terminal processing equipment for analysis processing;
and a light filtering structure is arranged between the adjacent bent parts and is used for filtering the stress fluorescence transmitted along the sensing optical fiber.
In the distributed optical fiber sensor as described above, preferably, the photodetector is provided at an outer arc of the curved portion.
In the distributed optical fiber sensor, the photodetector is preferably disposed at a stress fluorescence outlet of the filter mechanism.
In the distributed optical fiber sensor as described above, preferably, the curvature radius of the curved portion is less than 3.5 mm.
In the distributed optical fiber sensor as described above, preferably, the trigger front end further includes a microwave source for generating a modulated microwave and acting on each of the bending sections through the microwave transmission line.
As above-mentioned distributed optical fiber sensor, it is preferred that the peripheral cover of flexion is equipped with the lag, the lag includes oversheath and inner sheath, realize detachable connection through the eye-splice structure between oversheath and the inner sheath, the lag contains bent pipe portion and straight tube portion, bent pipe portion is used for holding the flexion, straight tube portion is used for spacing chucking sensing optical fiber's coating.
In the distributed optical fiber sensor, preferably, the inner wall of the protective sleeve is provided with a fluorescent reflective coating.
As above distributed optical fiber sensor, it is preferred, the opening has been seted up on the extrados of elbow portion, the outside mouth department of opening is equipped with the installation position of installation photoelectric detector, install dichroscope and filter plate in the opening, dichroscope position is close to the inside mouth of opening, dichroscope is used for the reflection to touch and gives out light.
In the distributed optical fiber sensor, preferably, an anti-separation structure is provided inside one end of the straight pipe portion, which is away from the bent pipe portion.
In the distributed optical fiber sensor, the bare fiber preferably includes a core and an outer cladding thereof or is a separate core.
A method of manufacturing a sensing curve, comprising the use of a protective sheath as described above, comprising the steps of:
s1, softening the optical fiber: taking a small section of optical fiber, removing a coating layer and a cladding layer in the middle of the optical fiber, and heating the middle of the optical fiber to soften the optical fiber;
s2, bending and shaping: placing the optical fiber softening part between the outer sheath and the inner sheath, pushing the outer sheath and the inner sheath to approach until the outer sheath and the inner sheath are combined into a protective sleeve, passively bending the optical fiber softening part, and naturally forming a bending part after cooling;
s3, attaching quantum dots: the outer sheath and the inner sheath are disassembled, the optical fiber is taken out, and the diamond NV color center is adhered to the surface of the bending part of the optical fiber;
s4, sheath installation: and then the outer sheath and the inner sheath are sleeved on the optical fiber in a combined manner.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the prior art, the sensing optical fiber is easy to manufacture and convenient to produce actually, the exciting effect of the exciting light on the diamond NV color center is strong, and the detection precision can be improved;
2. according to the invention, the filtering structure is arranged between the adjacent detection regions, so that mutual interference of fluorescence generated at different quantum dots can be avoided, and the accuracy of sensing detection is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an optical fiber sensor;
FIG. 2 is an enlarged view of the point A in FIG. 1;
FIG. 3 is a schematic diagram of a bend of an optical fiber according to one embodiment;
FIG. 4 is a front view of a bend in an optical fiber according to one embodiment;
FIG. 5 is a schematic diagram of a fiber bend (without a filter structure) according to an embodiment;
FIG. 6 is a schematic structural diagram of a protective cover according to a first embodiment;
FIG. 7 is a schematic cross-sectional view taken at C-C of FIG. 6;
FIG. 8 is an enlarged view of the point B in FIG. 6;
FIG. 9 is a front view of a bending portion of the optical fiber according to the second embodiment;
FIG. 10 is a schematic structural view of the protective cover according to the second embodiment;
FIG. 11 is a flow chart of a method of making a microbend fiber probe;
FIG. 12 is a view showing a state in which an optical fiber is bent and set.
The reference numbers are as follows:
1-trigger front end, 2-sensing optical fiber, 3-processing terminal, 4-protective sleeve, 5-port and 6-diamond NV color center;
11-trigger light part, 12-microwave source, 21-bending part, 22-filtering structure, 31-photoelectric detector, 41-bending pipe part, 42-straight pipe part, 43-outer sheath, 44-inner sheath, 45-anti-drop structure, 51-dichroic mirror, 121-microwave transmission line and 122-matching impedance.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
Example one
Referring to fig. 1 and fig. 2, the present embodiment provides a distributed optical fiber sensor based on an optical fiber microbend technology, including a trigger front end 1, a sensing optical fiber 2, and a processing terminal 3:
the trigger front end comprises a trigger light part 11, the trigger light part 11 is used for generating trigger light and coupling the trigger light into the sensing optical fiber 2;
the sensing optical fiber 2 comprises a plurality of groups of bending parts 21, the bending parts 21 are bare optical fibers, in the embodiment, the bare optical fibers comprise fiber cores and outer claddings thereof, in other options, in order to improve the overflow excitation effect of the exciting light, the claddings can be removed, only the single fiber core is reserved, the surface of the bare optical fiber is provided with a diamond NV color center 6, the bending loss is generated at the bending parts 21 after the triggering light enters the sensing optical fiber 2, the bending loss enables the triggering light to overflow from the fiber cores and excite the diamond NV6 color center, and the diamond NV color center 6 generates stress fluorescence under the action of the triggering light and the surrounding environment factors;
the processing terminal 3 comprises a plurality of groups of photodetectors 31, each photodetector 31 is arranged near each bending part 21 and is used for receiving stress fluorescence generated by the diamond NV color center 6 and transmitting fluorescence information to the terminal processing equipment for analysis processing;
a filtering structure 22 is disposed between adjacent bending portions 21, and the filtering structure 22 is used for filtering the stress fluorescence transmitted along the sensing optical fiber 2.
Further, in this example, the photodetector 31 is provided at the outer arc of the curved portion; referring to fig. 3, the extrados of the curved portion is a dense region, the intrados is a sparse region, and the NV color center 6 of the diamond located at the extrados has a more sufficient excitation effect, so that the photodetector 31 is placed at the location to obtain a higher fluorescence collection effect.
Furthermore, in this example, the adopted sensing fiber 2 is a multimode fiber with a numerical aperture of 0.39, and tests show that when the bending radius of the bending portion is smaller than 3.5mm, a certain amount of excitation light overflows and excites the diamond NV color center 6, and when the bending radius of the bending portion of the sensing fiber is in the interval of 1.5mm to 2.5mm, a more appropriate bending loss can be achieved, that is, the amount of trigger light loss can be ensured: the method can effectively excite the NV color center 6 of the diamond, and can not cause that subsequent detection points cannot be effectively excited due to excessive loss.
Furthermore, considering that the structure of the bending portion 21 of the sensing optical fiber 2 is easily damaged, in this example, as shown in fig. 3 and 4, the protective sleeve 4 is sleeved on the periphery of the bending portion 21, as shown in fig. 5 and 6, the protective sleeve 4 includes an outer sheath 43 and an inner sheath 44, the outer sheath 43 and the inner sheath 44 are detachably connected through a buckle structure, the protective sleeve 4 includes a bent pipe portion 41 and a straight pipe portion 42, the bent pipe portion 41 is used for accommodating the bending portion 21, and the straight pipe portion 42 is used for spacing and clamping the coating layer of the sensing optical fiber 2.
In view of the problem of easy installation, the protection sleeve 4 is divided into two detachable parts in the above example, and in view of the problem that the sensing optical fiber 2 is pulled in use, the pulling force acts on the bending part 21 to deform the structure of the sensing optical fiber, and in order to avoid this situation, in this example, the diameter of the straight pipe part 42 of the protection sleeve 4 is slightly smaller than the diameter of the coating layer of the sensing optical fiber 2, so that when the protection sleeve is installed, as shown in fig. 5, the straight pipe part 42 can press the coating layer, so that the effect of the pulling force on the bending part 21 can be effectively isolated, and the structure of the bending part 21 is stable.
Furthermore, as shown in fig. 8, in order to improve the acting force of the straight tube portion 42 on the coating layer, in the present embodiment, the straight tube portion 42 is further provided with an anti-disengaging structure 45, which may be a convex tooth or a concave pattern.
In this example, the photodetector 31 is disposed at the outer arc of the curved portion, for the convenience of mounting the photodetector 31, see fig. 5, fig. 6 and fig. 7, in this example, the outer arc surface of the curved portion 21 is provided with the through opening 5, in this example, the through opening 5 is in a horn shape, the outer port of the through opening 5 is provided with a mounting position for mounting the photodetector 31, the through opening 5 is internally provided with the dichroic mirror 51 and the filter 52, the dichroic mirror 51 is located close to the inner port of the through opening 5, the dichroic mirror 51 is used for reflecting the triggered light, and the dichroic mirror 51 and the filter 52 are used for removing the triggered light, so that only the generated stress fluorescence that the photodetector 31 can sense is generated, and the accuracy of the detection result is ensured.
Referring to fig. 5, it can be known that the bending portion 21 generates bending loss trigger light as a whole, however, only part of the bending loss trigger light has an effect, most of the other part of the loss light is directly wasted, and a small part of the loss light is coupled into the fiber core to continue to propagate.
In the specific implementation, considering that the position of the measuring point is difficult to plan in advance, the sensing optical fiber is designed into a detachable structure, in the specific embodiment, the sensing optical fiber is designed into an assembled structure comprising a connecting optical fiber and a bending part, and when the sensing optical fiber is used, the position and the number of the bending part can be adjusted according to the position and the number of the measuring point, so that the measurement of different sensing measuring points in the detection area is finally achieved, and the accurate distributed measurement is realized.
Based on the foregoing, in order to improve the detection effect of the sensing system, it is preferable that, as shown in fig. 1 and fig. 2, in this example, the trigger front end 1 further includes a microwave source 12, the microwave source 12 is used for generating modulated microwaves and acting on the bending portions 21 through a microwave transmission line 121, the microwave transmission line 121 is coil-shaped at each bending portion 21, and the distal end of the microwave transmission line 121 is provided with a matching impedance 122.
Example two
Based on the working principle of the first embodiment, it can be known that a part of the generated stress fluorescence is coupled into the sensing fiber 2 for propagation, and in order to avoid that the part of the stress fluorescence interferes with the detection accuracy of the adjacent point, it is necessary to arrange the filtering structure 22 to filter the stress fluorescence transmitted along the sensing fiber, so that the stress fluorescence still appears at the light exit of the filtering structure 22, and based on this consideration, the second embodiment proposes a different structural design from the first embodiment, except that: in this example, the photodetector 31 is provided at the stress fluorescence exit of the filter mechanism 22.
Referring to fig. 9 and 10, in this example, the structure of the protective cover 4 is not changed, but the through hole 5 is not designed, and the photodetector 31 may be directly disposed at the stress fluorescence exit of the filtering mechanism 22, and of course, in order to improve the fluorescence collection purity, an optical filtering lens or the like may be added between the photodetector 31 and the filtering mechanism 22.
EXAMPLE III
Conventionally, for the manufacture of the bending portion of the sensing optical fiber, an iron rod with a small diameter is heated at a high temperature and then used to bend the bare optical fiber of the sensing optical fiber.
In view of the above problems, referring to fig. 11, this example provides another method for manufacturing a bending portion, including applying the protective cover 4 as described above, including the following steps:
s1, softening the optical fiber:
taking a small section of optical fiber, wherein the length of the small section of optical fiber is about 5cm, removing a coating layer and a cladding layer in the middle of the optical fiber, and heating the middle of the optical fiber to soften the optical fiber;
s2, bending and shaping:
referring to fig. 12, the softened optical fiber is placed between the outer sheath and the inner sheath, the outer sheath and the inner sheath are pushed to approach until the outer sheath and the inner sheath are combined into a protective sheath (preferably, the softened optical fiber is abutted against the arc top of the inner sheath, the position of the inner sheath is kept inconvenient, the outer sheath is pushed to approach the inner sheath slowly by a pushing device to complete the folding operation), the softened optical fiber is passively bent, and a bent part is naturally formed after cooling;
s3, attaching quantum dots:
the outer sheath and the inner sheath are disassembled, the optical fiber is taken out, and the diamond NV color center is adhered to the surface of the bending part of the optical fiber;
s4, sheath installation:
and then the outer sheath and the inner sheath are sleeved on the small section of the optical fiber again.
And finally, connecting a plurality of manufactured small optical fibers through an optical fiber fusion technology to form a long distributed optical fiber.
In step S3, for the adhesion of the diamond NV color center, ethanol and the diamond NV color center are used to make a suspension, the bending portion is immersed in the suspension and then dried, and finally a layer of optical cement is coated on the surface of the bending portion.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean 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 this specification, 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 combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. The utility model provides a distributed optical fiber sensor based on optic fibre microbend technique, is including triggering front end, sensing optical fiber and processing terminal, its characterized in that:
the trigger front end comprises a trigger light part, and the trigger light part is used for generating trigger light and coupling the trigger light into the sensing optical fiber;
the sensing optical fiber comprises a plurality of groups of bending parts, the bending parts are bare optical fibers, diamond NV color centers are arranged on the surface of the bare optical fiber, the bending loss occurs at the bending parts after the trigger light enters the sensing optical fiber, the bending loss enables the trigger light to overflow from the fiber core and excite the diamond NV color centers, and the diamond NV color centers generate stress fluorescence under the action of the trigger light and surrounding environment factors;
the processing terminal comprises a plurality of groups of photoelectric detectors, each photoelectric detector is arranged near each bending part and used for receiving stress fluorescence generated by the NV color center of the diamond and transmitting fluorescence information to terminal processing equipment for analysis processing;
and a light filtering structure is arranged between the adjacent bent parts and is used for filtering the stress fluorescence transmitted along the sensing optical fiber.
2. A distributed optical fiber sensor based on optical fiber microbend technology according to claim 1, wherein: the photoelectric detector is arranged at the outer arc of the bending part.
3. A distributed optical fiber sensor based on optical fiber microbend technology according to claim 1, wherein: the photoelectric detector is arranged at a stress fluorescence outlet of the light filtering mechanism.
4. A distributed optical fiber sensor based on optical fiber microbend technology according to claim 1, wherein: the curvature radius of the curved portion is less than 3.5 mm.
5. A distributed optical fiber sensor based on optical fiber microbend technology according to claim 1, wherein: the trigger front end further includes a microwave source for generating modulated microwaves for application to each of the bend sections via the microwave transmission line.
6. A distributed optical fiber sensor based on optical fiber microbend technology according to claim 1, wherein: the utility model discloses a sensor, including the crooked portion, the periphery cover of crooked portion is equipped with the lag, the lag includes oversheath and inner sheath, realize detachable connection through the eye-splice structure between oversheath and the inner sheath, the lag contains bent pipe portion and straight tube portion, bent pipe portion is used for holding the crooked portion, straight tube portion is used for spacing chucking sensing optical fiber's coating.
7. The distributed optical fiber sensor based on the optical fiber microbend technology according to claim 6, wherein: and a fluorescent reflection coating is arranged on the inner wall of the protective sleeve.
8. A distributed optical fiber sensor based on optical fiber microbend technology according to any one of claims 6 or 7, wherein: the opening has been seted up on the extrados of elbow portion, the outside mouth department of opening is equipped with the installation position of installation photoelectric detector, install dichroscope and filter plate in the opening, the dichroscope position is close to the inboard mouth of opening, the dichroscope is used for the reflection to touch and gives out light.
9. The distributed optical fiber sensor based on the optical fiber microbend technology according to claim 6, wherein: the inner side of one end of the straight pipe part, which is far away from the bent pipe part, is provided with an anti-disengaging structure.
10. A method of making a microbend fiber optic probe, comprising the use of the protective sheath of claim 6, comprising the steps of:
s1, softening the optical fiber: taking a small section of optical fiber, removing a coating layer and a cladding layer in the middle of the optical fiber, and heating the middle of the optical fiber to soften the optical fiber;
s2, bending and shaping: placing the optical fiber softening part between the outer sheath and the inner sheath, pushing the outer sheath and the inner sheath to approach until the outer sheath and the inner sheath are combined into a protective sleeve, passively bending the optical fiber softening part, and naturally forming a bending part after cooling;
s3, attaching quantum dots: the outer sheath and the inner sheath are disassembled, the optical fiber is taken out, and the diamond NV color center is adhered to the surface of the bending part of the optical fiber;
s4, sheath installation: and then the outer sheath and the inner sheath are sleeved on the optical fiber in a combined manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210819554.9A CN114894225B (en) | 2022-07-13 | 2022-07-13 | Distributed optical fiber sensor based on optical fiber microbend technology and manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210819554.9A CN114894225B (en) | 2022-07-13 | 2022-07-13 | Distributed optical fiber sensor based on optical fiber microbend technology and manufacturing method |
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| CN114894225A true CN114894225A (en) | 2022-08-12 |
| CN114894225B CN114894225B (en) | 2022-09-30 |
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