CN109520442A - A kind of cascaded optical fiber pyrometric cone Mach-Zehnder interferometer and optical fiber curvature measuring system - Google Patents
A kind of cascaded optical fiber pyrometric cone Mach-Zehnder interferometer and optical fiber curvature measuring system Download PDFInfo
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- CN109520442A CN109520442A CN201811356628.XA CN201811356628A CN109520442A CN 109520442 A CN109520442 A CN 109520442A CN 201811356628 A CN201811356628 A CN 201811356628A CN 109520442 A CN109520442 A CN 109520442A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 212
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- 230000001427 coherent effect Effects 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 21
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- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 6
- 238000004513 sizing Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 4
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- 230000001681 protective effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
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- 238000002474 experimental method Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
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- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/255—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring radius of curvature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B9/00—Measuring instruments characterised by the use of optical techniques
- G01B9/02—Interferometers
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- Instruments For Measurement Of Length By Optical Means (AREA)
Abstract
The present invention relates to a kind of cascaded optical fiber pyrometric cone Mach-Zehnder interferometer and optical fiber curvature measuring system, the interferometer has included: the S cone optical fiber structure of light splitting effect, hump cone optical fiber structure, pickup arm optical fiber and the reference arm optical fiber for playing coupling；The S cone optical fiber structure is used to for the coherent light that light source issues being divided into the two-beam of light intensity 1:1, and wherein light beam enters pickup arm optical fiber, and another light beam enters reference arm optical fiber；The pickup arm optical fiber and the optical signal of reference arm optical fiber output are coupled at hump cone optical fiber structure.Interferometer of the present invention is by boring optical fiber structure as first optical splitter using S, cladding mode is couple by fibre core beam section, then it is coupled back into fibre core again at hump cone optical fiber structure to interfere, phase difference is poor from the effective refractive index of core mode and cladding mode.Mach-Zehnder interferometer of the present invention has structure simple, and can be realized the characteristics of measuring to slight curvature.
Description
Technical field
The present invention relates to fiber optic sensor technology fields, and in particular to a kind of cascaded optical fiber pyrometric cone Mach-Zehnder interferometer and
Optical fiber curvature measuring system.
Background technique
With social production progress, demand of the people to reliable, highly sensitive, pinpoint accuracy novel sensor is increasingly
Increase.Light sensor is because of low cost, lesser physical size, to the good resistance of electromagnetic interference, increasingly by
The concern of people.The one kind of Mach-Zehnder interferometer as light sensor, is widely used in acceleration, sound, magnetic field, stretching
Fields of measurement.
But in the prior art, there are no a kind of Mach-Zehnder interferometers to have structure simple, and can be realized to small
The function that curvature measures.
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 cascaded optical fiber pyrometric cone Mach
Zehnder interferometer and optical fiber curvature measuring system.
In order to achieve the above object, the present invention adopts the following technical scheme: a kind of cascaded optical fiber pyrometric cone Mach-Zehnder interferometer,
Include:
Play the S cone optical fiber structure of light splitting, play hump cone optical fiber structure, pickup arm optical fiber and the reference arm of coupling
Optical fiber；
Wherein, the S cone optical fiber structure is used to for the coherent light that light source issues being divided into the two-beam of light intensity 1:1, wherein one
Shu Guang enters the pickup arm optical fiber, and another light beam enters the reference arm optical fiber；
The pickup arm optical fiber and the optical signal of the reference arm optical fiber output carry out at hump cone optical fiber structure
Coupling.
Optionally, the S cone optical fiber structure is made of single mode optical fiber；
The S cone optical fiber structure includes: covering and fibre core；
The length of the S cone optical fiber structure is 391.16 μm, and vertical displacement is 49.95 μm, minimum 111.26 μ of cladding diameter
m。
Optionally, the hump cone optical fiber structure is made of single mode optical fiber；
The hump cone optical fiber structure includes: covering and fibre core；
152.40 μm of maximum cladding diameter of the hump cone optical fiber structure.
Optionally, the S cone optical fiber structure is made of following process:
A single mode optical fiber is obtained, wherein a segment length is light not less than the overlay pliers of 8cm by the single mode optical fiber
It gently peels off, and it is clean by removing surface to dip absolute alcohol；
The a single-mode fiber for eliminating overlay is put into optical fiber splicer at close to sources, the position of the cone of S needed for enabling
Be placed between two electrodes of heat sealing machine, optical fiber splicer electric discharge, the single mode optical fiber is heated so that the single mode optical fiber to
Axial and unilateral longitudinal stretching, is then quickly cooled down sizing, to constitute " S " type structure；
The shape of S cone is observed on optical fiber splicer screen, while observing the transmitted spectrum that spectrometer is shown, works as light loss
When reaching preset requirement, production is finished, and otherwise, is manually adjusted the motor on optical fiber splicer, is tightened its axial direction, then again
Electric discharge, the single mode optical fiber is heated in the axial direction and unilateral side longitudinal stretching, then rapid cooling sizing reach requirement up to being lost
Until.
Optionally, the hump cone optical fiber structure is made of following process:
The position for needing to make hump cone optical fiber structure is placed between electrode, it is described to need to make hump cone optical fiber
The position of structure also is located at described eliminate in a single-mode fiber of overlay；
The included Arch mode of optical fiber splicer is chosen, the motor that program can automatically control optical fiber splicer will in electric discharge
Optical fiber is to promoting between electrode, to form the structure of hump cone；
The transmitted spectrum of spectrometer output is observed, when light loss reaches preset requirement, production is finished, and otherwise, is adjusted manually
The motor on optical fiber splicer is saved, is then discharged again, the single mode optical fiber is heated in the axial direction and unilateral longitudinal stretching, then
It is quickly cooled down sizing, until loss reaches requirement.
The present invention also provides a kind of optical fiber curvature measuring systems, comprising:
Wideband light source, self-clamping module cause bending module, spectrometer and such as the described in any item interferometers in front；
Wherein, the interferometer is clamped on optical platform by the self-clamping module；
The input terminal of the S cone optical fiber structure is connect with the wideband light source；
The output end of the hump cone optical fiber structure is connect with the spectrometer.
Optionally, the self-clamping module includes:
First clamp structure and the second clamp structure；
The input terminal of the S cone optical fiber structure connects the wideband light source by first clamp structure；
The output end of the hump cone optical fiber structure connects the spectrometer by second clamp structure.
Optionally, the system also includes axially loaded constant blocks；
The axially loaded constant block is arranged between second clamp structure and the spectrometer；
The axially loaded constant block includes: fixed pulley and a counterweight being hung on the fixed pulley；
The axially loaded constant block is for keeping interferometer axially loaded in measurement process constant.
Optionally, described to cause to be bent module to include: the steel column for having spiral micrometer, the steel column is cylindrical body,
The steel column is equipped with one group of slit；
During curvature measurement, the steel column is pushed ahead to squeeze optical fiber, and optical fiber is made to bend.
Optionally, it is arranged with one layer of protective case, also on the surface of the interferometer to prevent the interferometer to be squeezed
Damage.
The invention adopts the above technical scheme, and the cascaded optical fiber pyrometric cone Mach-Zehnder interferometer has included: light splitting effect
S cone optical fiber structure, play hump cone optical fiber structure, pickup arm optical fiber and the reference arm optical fiber of coupling；Wherein, the S cone
Optical fiber structure is used to for the coherent light that light source issues being divided into the two-beam of light intensity 1:1, and wherein light beam enters the pickup arm light
Fibre, another light beam enter the reference arm optical fiber；The pickup arm optical fiber and the optical signal of the reference arm optical fiber output are in institute
It states and is coupled at hump cone optical fiber structure.Mach-Zehnder interferometer of the present invention is by boring optical fiber structure as the using S
Fibre core beam section is couple cladding mode by one optical splitter, is then coupled back into again at hump cone optical fiber structure
Fibre core interferes, and phase difference is poor from the effective refractive index of core mode and cladding mode.Mach of the present invention
Zehnder interferometer has structure simple, and can be realized the characteristics of measuring to slight curvature.
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 cascaded optical fiber pyrometric cone Mach-Zehnder interferometer embodiment one of the present invention provides；
Fig. 2 is the structural representation that S bores optical fiber structure in cascaded optical fiber pyrometric cone Mach-Zehnder interferometer embodiment one of the present invention
Figure；
Fig. 3 is that the structure of hump cone optical fiber structure in cascaded optical fiber pyrometric cone Mach-Zehnder interferometer embodiment one of the present invention is shown
It is intended to；
Fig. 4 is the production of the cone optical fiber structure of S described in cascaded optical fiber pyrometric cone Mach-Zehnder interferometer embodiment one of the present invention
Process；
Fig. 5 is the system of the cone optical fiber structure of hump described in cascaded optical fiber pyrometric cone Mach-Zehnder interferometer embodiment one of the present invention
Make process；
Fig. 6 is the structural schematic diagram that optical fiber curvature measuring system embodiment one of the present invention provides；
Fig. 7 is transmitted spectrum when optical fiber is not bent；
Fig. 8 is the variation tendency that the peak A shown in Fig. 7 increases peak wavelength with curvature；
Fig. 9 is the variation tendency that the peak B shown in Fig. 7 increases peak wavelength with curvature.
In figure: 1, S bores optical fiber structure；2, hump bores optical fiber structure；3, pickup arm optical fiber；4, reference arm optical fiber；5, broadband
Light source；6, the first clamp structure；7, the second clamp structure；8, bending module is caused；9, spectrometer；10, fixed pulley；11, counterweight.
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 cascaded optical fiber pyrometric cone Mach-Zehnder interferometer embodiment one of the present invention provides.
As shown in Figure 1, interferometer described in the present embodiment, comprising:
Play the S cone optical fiber structure 1 of light splitting, play hump cone optical fiber structure 2, pickup arm optical fiber 3 and the ginseng of coupling
Examine arm optical fiber 4；
Wherein, the S cone optical fiber structure 1 is used to for the coherent light that light source issues being divided into the two-beam of light intensity 1:1, wherein one
Shu Guang enters the pickup arm optical fiber 3, and another light beam enters the reference arm optical fiber 4；
The pickup arm optical fiber 3 and the reference arm optical fiber 4 output optical signal the hump cone optical fiber structure 2 at into
Row coupling.
Further, the S cone optical fiber structure 1 is made of single mode optical fiber；
As shown in Fig. 2, the S cone optical fiber structure 1 includes: covering and fibre core；
The length of the S cone optical fiber structure 1 is 391.16 μm, and vertical displacement is 49.95 μm, minimum cladding diameter 111.26
μm。
Further, the hump cone optical fiber structure 2 is made of single mode optical fiber；
The hump cone optical fiber structure 2 includes: covering and fibre core；
As shown in figure 3,152.40 μm of maximum cladding diameter of the hump cone optical fiber structure 2.
In actual use, the light signal of input is divided into interferometer described in the present embodiment by the S cone optical fiber structure 1
Two parts, a part enter the pickup arm optical fiber 3, and another part enters the reference arm optical fiber 4.Wherein, by the sensing
In the environment that arm optical fiber 3 detects needed for being put into, the reference arm optical fiber 4 does not make specially treated.Environment parameter will be in two-arm
An optical path difference is introduced, the optical signal of two-arm output will be bored in the hump to be converged at optical fiber structure 2, to generate and environment phase
The interference fringe of pass.
Fig. 4 is the production of the cone optical fiber structure 1 of S described in cascaded optical fiber pyrometric cone Mach-Zehnder interferometer embodiment one of the present invention
Process.
As shown in figure 4, the production process of the S cone optical fiber structure 1 includes:
S41: obtaining a single mode optical fiber, and by the single mode optical fiber, wherein overlay of the segment length not less than 8cm is clamped
Son is gently peelled off, and it is clean by removing surface to dip absolute alcohol；
S42: being put into optical fiber splicer for a single-mode fiber for eliminating overlay at close to sources, the cone of S needed for enabling
Position is placed between two electrodes of heat sealing machine, and the optical fiber splicer electric discharge, the single mode optical fiber is heated, so that the single-mode optics
Fibre is in the axial direction and unilateral longitudinal stretching, subsequent be quickly cooled down are formed, thus one " S " type structure of composition；
S43: observing the shape of S cone on optical fiber splicer screen, while observing the transmitted spectrum of the display of spectrometer 9, when
When light loss reaches preset requirement, production is finished, and otherwise, is manually adjusted the motor on optical fiber splicer, is tightened its axial direction, so
It discharges again afterwards, the single mode optical fiber is heated in the axial direction and unilateral longitudinal stretching, subsequent be quickly cooled down are formed, up to loss reaches
Until requirement.
In the above process, after carrying out electric discharge heating to optical fiber, the shape of S cone is observed on optical fiber splicer screen, together
When observation spectrometer 9 shown in transmitted spectrum.At this moment transmitted spectrum is still substantially a horizontal line, only there is certain decaying.
In order to obtain better interference fringe contrast, it is intended that protected by the couples optical energy of enough energy to cladding mode, and finally
Light intensity after card hump cone optical fiber structure 2 in fibre core and the light intensity being coupled back into from cladding mode are roughly equal, therefore want
The horizontal attenuation degree of the standard according to shown in oscillograph, to determine whether generating suitable " S " wimble structure.If loss intensity reaches
Less than requiring, motor should be first manually adjusted, its axial direction is tightened, there is prestressing force axially outward, then discharge again, until
Loss reaches requirement.In this experiment, as transmitted spectrum substantially -25dB, stop electric discharge.Final resulting S wimble structure
As shown below, cone section length is 391.16 μm, and vertical displacement is 49.95 μm, and 111.26 μm of area's minimum cladding diameter of cone is (original
The cladding diameter of SMF-28e is 125 μm).
Fig. 5 is the cone optical fiber structure 2 of hump described in cascaded optical fiber pyrometric cone Mach-Zehnder interferometer embodiment one of the present invention
Production process.
As shown in figure 5, the production process of the hump cone optical fiber structure 2 includes:
S51: the position for needing to make hump cone optical fiber structure 2 is placed between electrode, described to need to make the hump
The position of cone optical fiber structure 2 also is located at described eliminate in a single-mode fiber of overlay；
S52: choosing the included Arch mode of optical fiber splicer, and the motor that program can automatically control optical fiber splicer is discharging
When by optical fiber to promoting between electrode, to form the structure of hump cone；
S53: the transmitted spectrum that observation spectrometer 9 exports, when light loss reaches preset requirement, production is finished, otherwise, hand
The dynamic motor adjusted on optical fiber splicer, then discharges again, and the single mode optical fiber is heated in the axial direction and unilateral longitudinal stretching,
It is then quickly cooled down sizing, until loss reaches requirement.
The production of the hump cone optical fiber structure 2 is also with optical fiber splicer.Process one as made S cone before
Sample observes the transmitted spectrum exported at spectrometer 9 after electric discharge every time, after obtaining more satisfied interference fringe, can stop
Electric discharge.The hump cone microstructure finally obtained is as shown in the figure: maximum cladding diameter is 152.40 μm of (original SMF-28e coverings
125 μm of diameter).
It should be noted that Fig. 4 and Fig. 5, in practical operation, the single mode optical fiber can be Corning Incorporated's production
SMF-28e type single mode optical fiber, the optical fiber are the single mode optical fiber of G.652.D standard；Light source used be the produced 1250nm of TOP~
The broadband 1640nm SLED light source；Spectrometer 9 used is Yokogawa AQ6370C, and operation wavelength is 600nm~1700nm, point
Resolution is 0.5nm；The optical fiber splicer is Furukawa S178 optical fiber splicer, bores optical fiber for S cone optical fiber structure 1 and hump
The production of structure 2；The dual-purpose research system microscope of OLYMPUS BX51 Transflective, for observing made optical fiber mach once
Moral interferometer structure.
Fig. 6 is the structural schematic diagram that optical fiber curvature measuring system embodiment one of the present invention provides.
As shown in fig. 6, optical fiber curvature measuring system described in the present embodiment, comprising:
Wideband light source 5, self-clamping module cause bending module 8, spectrometer 9 and interferometer as described in Figure 1；
Wherein, the interferometer is clamped on optical platform by the self-clamping module；
The input terminal of the S cone optical fiber structure 1 is connect with the wideband light source 5；
The output end of the hump cone optical fiber structure 2 is connect with the spectrometer 9.
Further, the self-clamping module includes:
First clamp structure 6 and the second clamp structure 7；
The input terminal of the S cone optical fiber structure 1 connects the wideband light source 5 by first clamp structure 6；
The output end of the hump cone optical fiber structure 2 connects the spectrometer 9 by second clamp structure 7.
Further, the system also includes axially loaded constant blocks；
The axially loaded constant block is arranged between second clamp structure 7 and the spectrometer 9；
The axially loaded constant block includes: fixed pulley 10 and a counterweight 11 being hung on the fixed pulley 10；
The axially loaded constant block is for keeping interferometer axially loaded in measurement process constant.
Further, described to cause to be bent module 8 to include: the steel column for having spiral micrometer, the steel column is cylinder
Body, the steel column are equipped with one group of slit；
During curvature measurement, the steel column is pushed ahead to squeeze optical fiber, and optical fiber is made to bend.
Further, it is arranged with one layer of protective case, also on the surface of the interferometer to prevent the interferometer by crowded
Crushing is bad.
Bendingof light measuring system described in the present embodiment, the self-clamping module can be effectively prevented the torsion of optical fiber,
The axially loaded constant block guarantees that optical fiber axially loaded in measurement process is protected by fixed pulley 10 and a counterweight 11
It holds constant.The self-clamping module and the axially loaded constant block common guarantee are in entire measurement process, the shape of optical fiber
Become and be only bent, there is no torsions and axial tension.
It include: that one group of slit and one have spiral micrometer for making optical fiber carry out the curved cause bending module 8
Cylindrical body (steel column).In the measurements, cylindrical body is pushed ahead, and squeezes optical fiber, while slit plays fixed function, micro-bend situation
Under, it is believed that one section between this group of slit and cylinder is one section of circular arc, and the curvature (radian) of circular arc can acquire by the following method:
The expression formula of curvature (radian) are as follows:
, first will be mobile to optical fiber between cylinder in experimentation, until optical fiber just contacts slit, record spiral at this time
Micrometer registration is zero point, is then inwardly indented 0.05 ㎜ every time, and total indent is 1.2 ㎜, is recorded on scale and spectrometer 9
Data, totally 25 groups of data.The difference of spiral micrometer data scale and zeromark is d, and L is known as 64 ㎜, so as to root
The curvature C that optical fiber at this time is found out according to above-mentioned expression formula, in this experiment, the range of curvature is 0-2.34m-1。
Obtained experimental data is arranged, sliding average processing, sliding window size are carried out to each transmittance spectra data
100 are selected as, to remove high-frequency noise, makes curve smoothing, the peak-seeking after being is prepared.
Fig. 7 is the transmitted spectrum for observing optical fiber when not being bent, it can be seen that periodicity significantly relevant to wavelength, this with
The theory analysis of previous chapter is consistent.When gradually cylindrical body being promoted to increase curvature during the experiment, it can be seen from oscillograph
It observes, whole striped is moved to shortwave strong point, substantially linear.Therefore, we have selected two losses greatly place A
(1354.5nm), B (1423.0nm), come observe its with curvature is gradually increased when variation.
Fig. 8 is the variation tendency that the shown peak A increases with curvature, it is found that when curvature increases, the peak A is gradually to wave
Long shorter direction is mobile, and variation is approximately linear, and it is 4.7159nm/m that fitting, which can obtain sensitivity,-1, measurement range 0-
2.34m-1。
Fig. 9 is the variation tendency that increases with curvature of the shown peak B, and property and the peak A are substantially similar, with the increase of curvature,
Also the dynamic situation of hypsochromic shift is presented, but its sensitivity relatively has promotion, reaches 9.6036nm/m-1。
By the result to curvature measurement it is found that the curvature with the fiber Mach -Zehnder interferometer increases, transmitted spectrum
It is whole mobile to shortwave length direction.According to two groups of peaks that we choose, linear fit has been carried out to it, has been obtained preferable linear
Degree, and respectively reached 4.7159nm/m-1And 9.6036nm/m-1Sensitivity.
System described in the present embodiment by using Mach-Zehnder interferometer described in Fig. 1 can be realized to slight curvature into
The characteristics of row measurement, and sensitivity with higher.
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 cascaded optical fiber pyrometric cone Mach-Zehnder interferometer characterized by comprising
Play the S cone optical fiber structure of light splitting, play hump cone optical fiber structure, pickup arm optical fiber and the reference arm light of coupling
It is fine；
Wherein, the S cone optical fiber structure is used to for the coherent light that light source issues being divided into the two-beam of light intensity 1:1, wherein light beam
Into the pickup arm optical fiber, another light beam enters the reference arm optical fiber；
The pickup arm optical fiber and the optical signal of the reference arm optical fiber output are coupled at hump cone optical fiber structure.
2. interferometer according to claim 1, which is characterized in that the S cone optical fiber structure is made of single mode optical fiber；
The S cone optical fiber structure includes: covering and fibre core；
The length of the S cone optical fiber structure is 391.16 μm, and vertical displacement is 49.95 μm, 111.26 μm of minimum cladding diameter.
3. interferometer according to claim 1, which is characterized in that the hump cone optical fiber structure is made of single mode optical fiber
's；
The hump cone optical fiber structure includes: covering and fibre core；
152.40 μm of maximum cladding diameter of the hump cone optical fiber structure.
4. interferometer according to any one of claims 1 to 3, which is characterized in that the S cone optical fiber structure is by following mistake
Made of journey:
A single mode optical fiber is obtained, wherein overlay of the segment length not less than 8cm is gently shelled with pliers by the single mode optical fiber
It goes, and it is clean by removing surface to dip absolute alcohol；
The a single-mode fiber for eliminating overlay is put into optical fiber splicer at close to sources, the position of the cone of S needed for enabling is placed in
Between two electrodes of heat sealing machine, the optical fiber splicer electric discharge, the single mode optical fiber is heated, so that the single mode optical fiber is in the axial direction
And unilateral longitudinal stretching, it is then quickly cooled down sizing, to constitute " S " type structure；
The shape of S cone is observed on optical fiber splicer screen, while observing the transmitted spectrum that spectrometer is shown, when light loss reaches
When preset requirement, production is finished, and otherwise, is manually adjusted the motor on optical fiber splicer, is tightened its axial direction, then put again
Electricity, the single mode optical fiber is heated in the axial direction and unilateral longitudinal stretching, then rapid cooling sizing are up to loss reaches requirement
Only.
5. interferometer according to claim 4, which is characterized in that the hump cone optical fiber structure is made of following process
:
The position for needing to make hump cone optical fiber structure is placed between electrode, it is described to need to make hump cone optical fiber structure
Position also be located at described eliminate in a single-mode fiber of overlay；
Choose the included Arch mode of optical fiber splicer, program can automatically control the motor of optical fiber splicer in electric discharge for optical fiber
It is promoted between to electrode, to form the structure of hump cone；
The transmitted spectrum of spectrometer output is observed, when light loss reaches preset requirement, production is finished, and otherwise, manually adjusts light
Motor on fine heat sealing machine, then discharges again, and the single mode optical fiber is heated in the axial direction and unilateral longitudinal stretching, then quickly
Cooling and shaping, until loss reaches requirement.
6. a kind of optical fiber curvature measuring system characterized by comprising
Wideband light source, self-clamping module cause bending module, spectrometer and such as interferometer described in any one of claim 1 to 5；
Wherein, the interferometer is clamped on optical platform by the self-clamping module；
The input terminal of the S cone optical fiber structure is connect with the wideband light source；
The output end of the hump cone optical fiber structure is connect with the spectrometer.
7. system according to claim 6, which is characterized in that the self-clamping module includes:
First clamp structure and the second clamp structure；
The input terminal of the S cone optical fiber structure connects the wideband light source by first clamp structure；
The output end of the hump cone optical fiber structure connects the spectrometer by second clamp structure.
8. system according to claim 7, which is characterized in that further include: axially loaded constant block；
The axially loaded constant block is arranged between second clamp structure and the spectrometer；
The axially loaded constant block includes: fixed pulley and a counterweight being hung on the fixed pulley；
The axially loaded constant block is for keeping interferometer axially loaded in measurement process constant.
9. system according to claim 6, which is characterized in that the cause bending module includes: one with spiral micrometer
The steel column of instrument, the steel column are cylindrical body, and the steel column is equipped with one group of slit；
During curvature measurement, the steel column is pushed ahead to squeeze optical fiber, and optical fiber is made to bend.
10. according to the described in any item systems of claim 6 to 9, which is characterized in that be also arranged on the surface of the interferometer
There is one layer of protective case, to prevent the interferometer to be squeezed damage.
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