CN109507149A - A kind of fibre optic interferometer and preparation method thereof - Google Patents
A kind of fibre optic interferometer and preparation method thereof Download PDFInfo
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- CN109507149A CN109507149A CN201811344117.6A CN201811344117A CN109507149A CN 109507149 A CN109507149 A CN 109507149A CN 201811344117 A CN201811344117 A CN 201811344117A CN 109507149 A CN109507149 A CN 109507149A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
- G01N2021/458—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods using interferential sensor, e.g. sensor fibre, possibly on optical waveguide
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/08—Optical fibres; light guides
- G01N2201/088—Using a sensor fibre
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Abstract
The present invention relates to a kind of fibre optic interferometer and preparation method thereof, the fibre optic interferometer includes: capillary, input optical fibre and output optical fibre；Wherein, one end of the input optical fibre is inserted into along the capillary axis direction into a port of the capillary；One end of the output optical fibre is inserted into along the capillary axis direction into another port of the capillary；Inside the capillary, on the same line, and the straight line is parallel with the axis of the capillary for the axis of the axis of the input optical fibre and the output optical fibre；There is interval between one end of the input optical fibre and one end of the output optical fibre, the interval and the tube wall of the input optical fibre, the output optical fibre and the capillary form a cavity.The present invention is inserted in capillary by increasing capillary using by input optical fibre and output optical fibre, enhances fibre optic interferometer structure to the sensibility of refractive index in cavity, improves the sensitivity to fluid refractometry.
Description
Technical field
The present invention relates to fiber optic sensor technology fields, and in particular to a kind of fibre optic interferometer and preparation method thereof.
Background technique
Traditional sensor mainly includes inductance sensor, electric resistance sensor, capacitance sensor, pyroelectric sensor, magnetoelectricity
The realization of sensor etc., sensing measurement be unable to do without electricity.As electricity ubiquitous, this biography in the environment locating for us
Sensor inevitably will receive electromagnetic interference, and due to characteristic of electricity itself, when use also needs to pay special attention to its safety, and light
The appearance of fibre sensing, then well solved this problem.Since the main making material of optical fiber is silica, optical fiber
Sensor very light in weight, flexible strong, integrability has corrosion-resistant, can use in high temperature and high pressure environment.
But existing fibre optical sensor, when the refractive index to fluid measures, measurement accuracy and sensitivity are lower,
And the fibre optical sensor internal structure stability for measuring fluid refractive index is poor.
Summary of the invention
In view of this, it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of fibre optic interferometer and its systems
Make method.
In order to achieve the above object, the present invention adopts the following technical scheme: a kind of fibre optic interferometer, comprising:
Capillary, input optical fibre and output optical fibre；
Wherein, a port into the capillary is inserted into along the capillary axis direction in one end of the input optical fibre
It is interior；
One end of the output optical fibre is inserted into along the capillary axis direction into another port of the capillary；
Inside the capillary, the axis of the axis of the input optical fibre and the output optical fibre on the same line,
And the straight line is parallel with the axis of the capillary；One end of the input optical fibre and one end of the output optical fibre it
Between there is interval, the interval forms one with the tube wall of the input optical fibre, the output optical fibre and the capillary
Cavity.
Optionally, the input optical fibre inside the capillary and the output optical fibre are the light for peelling off coat
It is fine；The input optical fibre and the output optical fibre outside the capillary are the optical fiber with coat.
Optionally, inside the capillary, the input optical fibre and the output optical fibre pass through respectively glue with it is described
The inner wall of capillary is fixed.
Optionally, fluid to be measured or tested gas are filled in the cavity.
Optionally, the input optical fibre and the output optical fibre are single mode optical fiber.
Optionally, through-hole is offered on the tube wall of the capillary, the through-hole connects the cavity directly with the external world
Touching.
Optionally, the input optical fibre and the output optical fibre are multimode fibre.
Optionally, high-reflecting film is coated on the inner wall of the capillary；
Anti-reflective coating is coated on the outer surface of the capillary, and/or, laser is utilized on the outer surface of the capillary
Grating processed is write, to increase reflectivity of the outer surface to light of the capillary.
The present invention also provides a kind of production methods of fibre optic interferometer, comprising:
Choose capillary；
Coat is peelled off from one end of the first optical fiber, and the first optical fiber for peelling off coat is inserted into the one of the capillary
It is in a port and fixed, the other end for not peelling off coat on first optical fiber is exposed to outside the port of the capillary；
Coat is peelled off from one end of the second optical fiber, and the second optical fiber for peelling off coat is inserted into the another of the capillary
In a port, and make the first optical fiber inside the capillary axis and the second optical fiber axis on the same line, and
The gap length between second optical fiber and the first optical fiber is adjusted along the straight line, to obtain satisfactory cavity length；
One end face of the capillary is fixed with first optical fiber, by another end face of the capillary and institute
It states the second optical fiber to fix, the tube wall of the fiber section for being inserted into the capillary and the capillary is fixed.
Optionally, the method also includes:
Through-hole is opened up on the tube wall of the capillary, so that the cavity is directly contacted with the external world；
First optical fiber and second optical fiber are multimode fibre；
One layer of high-reflecting film is plated on the inner wall of the capillary, and one layer of Anti-reflective coating is plated on the outer surface of the capillary,
And/or using laser-light write grating on the outer surface of the capillary, to increase the outer surface of the capillary to the anti-of light
Penetrate rate.
The invention adopts the above technical scheme, and the fibre optic interferometer includes: capillary, input optical fibre and output optical fibre；
Wherein, one end of the input optical fibre is inserted into along the capillary axis direction into a port of the capillary；It is described
One end of output optical fibre is inserted into along the capillary axis direction into another port of the capillary；In the capillary
Inside, the axis of the axis of the input optical fibre and the output optical fibre on the same line, and, the straight line and the capillary
The axis of pipe is parallel；Between one end of the input optical fibre and one end of the output optical fibre exist interval, it is described interval with
The tube wall of the input optical fibre, the output optical fibre and the capillary forms a cavity.The present invention is by increasing hair
Tubule is inserted in capillary using by input optical fibre and output optical fibre, enhances fibre optic interferometer structure to cavity infolding
The sensibility for penetrating rate improves the sensitivity to fluid refractometry.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram that fibre optic interferometer embodiment one of the present invention provides；
Fig. 2 is the structural schematic diagram that fibre optic interferometer embodiment two of the present invention provides；
Fig. 3 is the inside light field simulation effect picture of fibre optic interferometer；
Fig. 4 is the variation relation of light intensity Yu intracavitary refractive index；
Fig. 5 is the flow diagram that the production method embodiment one of fibre optic interferometer of the present invention provides.
In figure: 1, capillary；2, input optical fibre；3, output optical fibre；4, cavity；5, multimode fibre；6, coat is peelled off
Optical fiber；7, with the optical fiber of coat；8, glue；9, through-hole.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below
Detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work
Other embodiment belongs to the range that the present invention is protected.
Fig. 1 is the structural schematic diagram that fibre optic interferometer embodiment one of the present invention provides.
As shown in Figure 1, fibre optic interferometer described in the present embodiment, comprising:
Capillary 1, input optical fibre 2 and output optical fibre 3；
Wherein, one end of the input optical fibre 2 is inserted into one into the capillary 1 along 1 axis direction of capillary
In port；
One end of the output optical fibre 3 is inserted into another port into the capillary 1 along 1 axis direction of capillary
It is interior；
Inside the capillary 1, the axis of the axis of the input optical fibre 2 and the output optical fibre 3 is in same straight line
On, and, the straight line is parallel with the axis of the capillary 1；One end of the input optical fibre 2 and the output optical fibre 3
There is interval, the tube wall shape at the interval and the input optical fibre 2, the output optical fibre 3 and the capillary 1 between one end
At a cavity 4.
Further, the input optical fibre 2 inside the capillary 1 and the output optical fibre 3 are to peel off coating
The optical fiber 6 of layer；The input optical fibre 2 and the output optical fibre 3 outside the capillary 1 are the optical fiber with coat
7。
Further, inside the capillary 1, the input optical fibre 2 and the output optical fibre 3 pass through glue 8 respectively
It is fixed with the inner wall of the capillary 1.
By the way that the input optical fibre 2 and the output optical fibre 3 are consolidated by glue 8 and the inner wall of the capillary 1 respectively
It is fixed, it avoids the input optical fibre 2 in use and the output optical fibre 3 and slight vibration occurs for the capillary 1
Change the relative position of two optical fiber, to generate compared with big shearing, it is poor which is conducive to fibre optic interferometer internal structure stability.
Further, in order to which the position for guaranteeing the input optical fibre 2 and the output optical fibre 3 and the capillary 1 is firm
Property, one can be being coated at several millimeters of fiber end face of position before input optical fibre 2 and output optical fibre 3 are inserted into capillary 1
Layer glue, it is consistent that the length of coating should be inserted into the length of capillary 1 with optical fiber.The glue used will not should occur in a short time
Solidification inserts optical fibers into after capillary 1 and further uses glue reinforcing in 1 end face of capillary again, after glue sufficiently solidifies i.e.
It can.
Further, fluid to be measured or tested gas are filled in the cavity 4.
Further, the input optical fibre 2 and the output optical fibre 3 are single mode optical fiber.
The present embodiment is inserted in capillary 1 by increasing capillary 1 using by input optical fibre 2 and output optical fibre 3,
Fibre optic interferometer structure is enhanced to the sensibility of refractive index in cavity 4, improves the sensitivity to fluid refractometry.
Fig. 2 is the structural schematic diagram that fibre optic interferometer embodiment two of the present invention provides.
As shown in Fig. 2, fibre optic interferometer described in the present embodiment, comprising:
Capillary 1, input optical fibre 2 and output optical fibre 3；
Wherein, one end of the input optical fibre 2 is inserted into one into the capillary 1 along 1 axis direction of capillary
In port；
One end of the output optical fibre 3 is inserted into another port into the capillary 1 along 1 axis direction of capillary
It is interior；
Inside the capillary 1, the axis of the axis of the input optical fibre 2 and the output optical fibre 3 is in same straight line
On, and, the straight line is parallel with the axis of the capillary 1；One end of the input optical fibre 2 and the output optical fibre 3
There is interval, the tube wall shape at the interval and the input optical fibre 2, the output optical fibre 3 and the capillary 1 between one end
At a cavity 4.
Further, offer through-hole 9 on the tube wall of the capillary 1, the through-hole 9 make the cavity 4 directly with
External world's contact.
Further, the input optical fibre 2 and the output optical fibre 3 are multimode fibre 5.
Further, high-reflecting film is coated on the inner wall of the capillary 1；
It is coated with Anti-reflective coating on the outer surface of the capillary 1, and/or, using sharp on the outer surface of the capillary 1
Light writes grating processed, to increase reflectivity of the outer surface to light of the capillary 1.
Fibre optic interferometer described in the present embodiment by way of offering through-hole 9 on the tube wall in capillary 1, open by formation
Chamber realizes that cavity 4 is directly contacted with the external world；Since light can excite various modes and after entering capillary 1 to improve light
The light energy that fibre can receive, therefore the single mode optical fiber in one structure of embodiment is substituted for multimode fibre 5.
In cavity 4, since two root multimode fibers 5 are tightly attached to the side of 1 wall of capillary, according to reflection law, from multimode
The light being emitted in optical fiber 5 cannot be introduced into another single mode optical fiber fibre core that (side wall is referred to perpendicular to paper after side wall reflects
1 wall of capillary on the direction of face), it can be reflected from 1 wall of capillary and by the received light of multimode fibre 5 only through upper wall and lower wall
The small-scale light of reflection.Therefore, the position of aperture can be arranged in the side wall of capillary 1.Light is in the anti-of capillary wall
It penetrates that rate is lower, only considers to reflect primary light in 1 wall of capillary.During specific production, in order in time by fluid
Fluid remaining in cavity 4 is excluded in time simultaneously full of cavity 4, which should guarantee that loss is less big and capillary 1
It is made under the premise of intensity as big as possible.
Other than the position of aperture and size, the length selection of capillary 1 is also required to emphasis consideration.If capillary 1 is too long,
Fluid is easy after being full of cavity 4 in intracavitary residual, to influence measurement next time.Therefore, the length of capillary 1 should meet
It, should be as short as possible in the case where 4 length requirement of manufacturing conditions and cavity.
For the fibre optic interferometer that the present embodiment is proposed, the application also uses Rsoft simulation softward to inside configuration
Optical field distribution be simulated, and the influence that comparative analysis capillary 1 generates light field, Fig. 3 are the fibre optic interferometer
Internal light field simulation effect picture.
Two width figures of left and right show sectional view of the structure in xoz plane and flat in yoz respectively in (a) in Fig. 3
Sectional view on face.(b) two width figures of left and right show that structure is in xoz plane and in yoz plane when being not added with capillary 1 in
Light energy distribution figure.(c) after two width figures of left and right show and are added to capillary 1 in, structure xoz plane and in yoz it is flat
The light energy distribution figure in face.The internal diameter that capillary 1 is selected when simulation is 150 microns, and the refractive index of 1 wall of capillary is 1.5, optical fiber
Cladding diameter be 125 microns, core diameter be 50 microns.The refractive index of covering and fibre core is distinguished when wavelength is 1.55 microns
For 1.455 and 1.465, two fiber end face spacing are 1.5 millimeters.
It can be found that after being added to capillary 1, the light energy received is obviously increased for comparison diagram (b) and figure (c).This
It is that the mode that can generate loss to intracavitary script due to capillary 1 plays the role of constraint, i.e., after the reflection of 1 wall of capillary again
It has been coupled back into optical fiber.
To verify the feasibility that the structure carries out refractometry, the opposite of the light intensity received is also simulated under study for action
Intensity with intracavitary refractive index variation relation, as shown in Figure 4.The ranges of indices of refraction that simulation is selected is 1.0-1.4.
In Fig. 4 (a), relative light intensity and intracavitary refraction when (b) respectively showing addition capillary 1 and not adding capillary 1
The variation relation of rate.
It can be seen from figure 4 that relative light intensity and refractive index are without apparent linear in the case where no capillary 1
Relationship, but after adding capillary 1, the linear relationship of the two is obviously reinforced, and the loss of structure significantly reduces, and sensitivity is aobvious
It writes and improves.As it can be seen that structure described in the present embodiment can refractive index measure.
It further, in actual use, can be according to the refractive index of 1 wall of capillary on the inner wall of the capillary 1
It is coated with high-reflecting film；It is coated with Anti-reflective coating on the outer surface of the capillary 1, and/or, it is sharp on the outer surface of the capillary 1
Reduce loss with laser-light write grating to increase reflectivity of the outer surface to light of the capillary 1.
Fig. 5 is the flow diagram that the production method embodiment one of fibre optic interferometer of the present invention provides.
As shown in figure 5, production method described in the present embodiment includes:
S51: capillary is chosen；
S52: coat is peelled off from one end of the first optical fiber, and the first optical fiber for peelling off coat is inserted into the capillary
A port in and it is fixed, the other end for not peelling off coat on first optical fiber is exposed to the port of the capillary
Outside；
S53: coat is peelled off from one end of the second optical fiber, and the second optical fiber for peelling off coat is inserted into the capillary
Another port in, and make the first optical fiber inside the capillary axis and the second optical fiber axis in same straight line
On, and the gap length between second optical fiber and the first optical fiber is adjusted along the straight line, it is long to obtain satisfactory cavity
Degree；
S54: an end face of the capillary is fixed with first optical fiber, by another end face of the capillary
It is fixed with second optical fiber, the tube wall of the fiber section for being inserted into the capillary and the capillary is fixed.
It should be noted that needing to choose suitable cavity length by two optical fiber (the first optical fiber and the second optical fiber)
It is connect respectively with spectrometer and light source, and the first optical fiber for peelling off coat is inserted into the capillary, fixed and write down institute
The position for the end face that the first optical fiber is inserted into a port of the capillary is stated, then slowly moves second optical fiber, together
When observation spectrometer in spectrogram write down second optical fiber in the capillary light when the spectrogram of appearance is met the requirements
Interior endface position, the distance for measuring the first fiber end face and the second fiber end face in the capillary at this time can be obtained
Suitable cavity length.
Further, the production method further include:
Through-hole is opened up on the tube wall of the capillary, so that the cavity is directly contacted with the external world；
First optical fiber and second optical fiber are multimode fibre；
One layer of high-reflecting film is plated on the inner wall of the capillary, and one layer of Anti-reflective coating is plated on the outer surface of the capillary,
And/or using laser-light write grating on the outer surface of the capillary, to increase the outer surface of the capillary to the anti-of light
Penetrate rate.
The fibre optic interferometer produced using method described in the present embodiment, when the refractive index to fluid measures,
Measurement accuracy and high sensitivity, and internal structure stability is good.
It is understood that same or similar part can mutually refer in the various embodiments described above, in some embodiments
Unspecified content may refer to the same or similar content in other embodiments.
It should be noted that in the description of the present invention, term " first ", " second " etc. are used for description purposes only, without
It can be interpreted as indication or suggestion relative importance.In addition, in the description of the present invention, unless otherwise indicated, the meaning of " multiple "
Refer at least two.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discussed suitable
Sequence, including according to related function by it is basic simultaneously in the way of or in the opposite order, Lai Zhihang function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
It should be appreciated that each section of the invention can be realized with hardware, software, firmware or their combination.Above-mentioned
In embodiment, software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of column technology or their combination are realized: having a logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are understood that realize all or part of step that above-described embodiment method carries
It suddenly is that relevant hardware can be instructed to complete by program, the program can store in a kind of computer-readable storage medium
In matter, which when being executed, includes the steps that one or a combination set of embodiment of the method.
It, can also be in addition, each functional unit in each embodiment of the present invention can integrate in a processing module
It is that each unit physically exists alone, can also be integrated in two or more units in a module.Above-mentioned integrated mould
Block both can take the form of hardware realization, can also be realized in the form of software function module.The integrated module is such as
Fruit is realized and when sold or used as an independent product in the form of software function module, also can store in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only memory, disk or CD etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of fibre optic interferometer characterized by comprising
Capillary, input optical fibre and output optical fibre；
Wherein, one end of the input optical fibre is inserted into along the capillary axis direction into a port of the capillary；
One end of the output optical fibre is inserted into along the capillary axis direction into another port of the capillary；
Inside the capillary, the axis of the axis of the input optical fibre and the output optical fibre on the same line, and, institute
It is parallel with the axis of the capillary to state straight line；Exist between one end of the input optical fibre and one end of the output optical fibre
Interval, the interval and the tube wall of the input optical fibre, the output optical fibre and the capillary form a cavity.
2. fibre optic interferometer according to claim 1, which is characterized in that the input optical fibre inside the capillary
It is the optical fiber for peelling off coat with the output optical fibre；The input optical fibre and the output light outside the capillary
Fibre is the optical fiber with coat.
3. fibre optic interferometer according to claim 1, which is characterized in that inside the capillary, the input optical fibre
The inner wall for passing through glue and the capillary respectively with the output optical fibre is fixed.
4. fibre optic interferometer according to claim 1, which is characterized in that be filled with fluid to be measured or tested in the cavity
Gas.
5. fibre optic interferometer according to any one of claims 1 to 4, which is characterized in that the input optical fibre and described defeated
Optical fiber is single mode optical fiber out.
6. fibre optic interferometer according to any one of claims 1 to 4, which is characterized in that on the tube wall of the capillary
Through-hole is offered, the through-hole contacts the cavity directly with the external world.
7. fibre optic interferometer according to claim 6, which is characterized in that the input optical fibre and the output optical fibre are
Multimode fibre.
8. according to claim 1 to 4,7 described in any item fibre optic interferometers, which is characterized in that in the inner wall of the capillary
On be coated with high-reflecting film；
Anti-reflective coating is coated on the outer surface of the capillary, and/or, laser-light write system is utilized on the outer surface of the capillary
Grating, to increase reflectivity of the outer surface to light of the capillary.
9. a kind of production method of fibre optic interferometer characterized by comprising
Choose capillary；
Coat is peelled off from one end of the first optical fiber, and the first optical fiber for peelling off coat is inserted into an end of the capillary
It is in mouthful and fixed, the other end for not peelling off coat on first optical fiber is exposed to outside the port of the capillary；
Coat is peelled off from one end of the second optical fiber, and the second optical fiber for peelling off coat is inserted into another of the capillary
In port, and make the first optical fiber inside the capillary axis and the second optical fiber axis on the same line, and along this
Straight line adjusts the gap length between second optical fiber and the first optical fiber, to obtain satisfactory cavity length；
One end face of the capillary is fixed with first optical fiber, by another end face of the capillary and described the
Two optical fiber are fixed, and the tube wall of the fiber section for being inserted into the capillary and the capillary is fixed.
10. according to the method described in claim 9, it is characterized by further comprising:
Through-hole is opened up on the tube wall of the capillary, so that the cavity is directly contacted with the external world；
First optical fiber and second optical fiber are multimode fibre；
One layer of high-reflecting film is plated on the inner wall of the capillary, one layer of Anti-reflective coating of plating on the outer surface of the capillary, and/
Or, using laser-light write grating on the outer surface of the capillary, to increase reflection of the outer surface to light of the capillary
Rate.
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| CN103592719A (en) * | 2013-10-23 | 2014-02-19 | 华东师范大学 | Manufacturing method of metal capillary attenuated total reflection infrared hollow optical fiber and optical fiber obtained through the manufacturing method |
| CN103557960A (en) * | 2013-11-06 | 2014-02-05 | 重庆科技学院 | Fabry-Perot fiber-optic temperature sensing system and method |
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