CN106772550B - Optical fiber bending mode eliminating device and method - Google Patents
Optical fiber bending mode eliminating device and method Download PDFInfo
- Publication number
- CN106772550B CN106772550B CN201710075206.4A CN201710075206A CN106772550B CN 106772550 B CN106772550 B CN 106772550B CN 201710075206 A CN201710075206 A CN 201710075206A CN 106772550 B CN106772550 B CN 106772550B
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- coil section
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- mould
- optical fiber
- disappears
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- 238000005452 bending Methods 0.000 title claims abstract description 38
- 239000013307 optical fiber Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims abstract description 33
- 230000005540 biological transmission Effects 0.000 claims abstract description 21
- 239000000835 fiber Substances 0.000 claims description 54
- 238000012545 processing Methods 0.000 claims description 14
- 239000004615 ingredient Substances 0.000 claims description 7
- 230000005284 excitation Effects 0.000 claims description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 3
- 230000002238 attenuated effect Effects 0.000 abstract 1
- 230000008030 elimination Effects 0.000 abstract 1
- 238000003379 elimination reaction Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical group [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 230000005658 nuclear physics Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/005—Details of radiation-measuring instruments calibration techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T3/00—Measuring neutron radiation
- G01T3/06—Measuring neutron radiation with scintillation detectors
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Measurement Of Radiation (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention discloses a device and a method for eliminating optical fiber bending modes, which coil a multimode optical fiber by an inner coiling mould and an outer coiling mould by a double-curvature coiling method, so that the multimode optical fiber forms a small-radius coiled part wound on the inner coiling mould and a large-radius coiled part wound on the outer coiling mould, the multimode optical fiber is used as a transmission medium, the optical fiber is coiled in advance according to two different radiuses, the high-order mode component coupled into the optical fiber is effectively attenuated by using the small-radius coiled part, and then the bent transmission mode possibly excited by the previous link is eliminated by using the large-radius coiled part, so that the high-order mode is inhibited by the multimode optical fiber, the output light intensity tends to be stable, and the optical power output by the optical signal after the mode elimination in the moving process of the optical fiber is always kept consistent, so that when the scintillator position sensitive nuclear detector is measured, reference information such as position and the like does not need to be measured by other detectors additionally.
Description
Technical field
The invention belongs to nuclear physics detecting fields.The present invention is that optics passes in neutron (-detecting) phosphor position sensitive detector calibration system
The defeated optical fiber mold device that disappears more particularly to the scene to be aspired for stability to output intensity can allow laser light source in multimode fibre
In transmission process, the ingredient of most of higher mode obtains enough decaying, it is ensured that the light function that optical fiber exports in moving process
Rate is stablized.
Background technique
Large area imaging type scintillator neutron detector although many kinds of, basic principle be it is similar, pass through fluorescence
Excitation and photoelectric conversion realize the detection to particle.Neutron (-detecting) phosphor position sensitive detector mainly has scintillation screen, wave shifting fiber, photoelectricity
The composition such as multiplier tube mixes the scintillator absorbing wavelength of substance close to 405, and neutron and scintillator generate nuclear reaction, and reaction generates
And particle photoelectric effect is excited in ZnS scintillator, the photon of generation can separate in the middle part of scintillator dielectric layer to be penetrated and enters
Wave shifting fiber in interlayer, is subsequently converted to the photon of longer wavelength, some of multi-anode photomultiplier is transferred to by optical fiber
Channel, photon generate electric impulse signal after photoelectric conversion and obtain gain amplifier, and the response signal on each read-out channel is most
It is recorded eventually by data-acquisition system, provides the information such as position and the time of neutron example, complete the detection of neutron.
For the principle of scintillator detector, calibrating platform realizes the excitation replacement of fluorescence by the way of Photoelectric Detection.
It is specific then using the modulated device such as laser or LED as light source, after a series of adjustings, by fiber-fed to collimating element,
It is finally projected to fiber array or photomultiplier tube entrance window to be measured.It needs to carry out the signal amplitude of output in calibration process
Normalization comparison, it is desirable that the light intensity of input must be by quantization monitoring and it is stable.
The device is used for the constant output of analog light source, and then tests the fiber array and photomultiplier transit of scintillator detector
Pipe gain.According to optical fiber transmission theory, the corresponding decaying radius of every kind of transmission mode, less than the system that decays under the curvature of this radius
Number will increase rapidly.It is difficult to determine in view of the mapping ratio of transmission mode each in multimode fibre, multimode fibre is in various bendings
Overall attenuation under radius is often nonlinear.Occasion higher for stability requirement, it will usually single mode optical fiber is applied, and
The minimum limitation for curving radius is provided to ensure the transmission of analog signal.
For the internal diameter restrictions of single mode optical fiber in the range of transmission wavelength, not only manufacture is difficult at high cost, and is unfavorable for transmitting
Power, and also have matched limitation to light source.Once expanding interior core diameter to transmit higher power, or in different measurements
Transmission light source is replaced under occasion, wavelength changes, and will lead to the introducing of higher mode, destroys original stable guarantee.In addition,
In certain special bending radius, there is also unique transmission mould, the attenuation coefficient of associative mode can be strongly reduced.Above-mentioned two
Kind source results in the limitation of single mode optical fiber transmission of analogue signal and multimode fibre and not can guarantee constant analog signal and stablize length
The cause of Distance Transmission.
Furthermore in order to be demarcated to each channel of photomultiplier tube, output optical fibre need to be fixed on mechanical platform, it is right
Entire wave shifting fiber plane is scanned, and in this way during scanning motion, is caused fibre-optical bending, is led to different location light output
Power is inconsistent, loses the meaning of calibration.Therefore other additional detections are generally required in the quick nuclear detector of measurement flashing position
Device subsidiary position etc. is referring to information.
Therefore it is badly in need of a kind of optical fiber that can be solved the above problems and disappears mould method and device.
Summary of the invention
Disappear mold device and method the object of the present invention is to provide a kind of fibre-optical bending, using multimode fibre as transmission medium,
It is coiled in advance according to two different radiuses, using minor radius coil section will be coupled into the higher mode into optical fiber at
Divide and effectively decayed, filters out the low order mode to large radius bend-insensitive, use the large radius of another relatively large radius
Coil section eliminates the bending transmission mould that a upper link may excite.It is final to realize multimode fibre to higher mode under the two cooperation
Inhibition and stablize output, and make always consistent in different location optical output power.
It is upper purposeful in order to realize, disappear mold device the invention discloses a kind of fibre-optical bending, the interior coiling mould including annular
Tool is surrounded on the outer coiling mold and multimode fibre on the interior coiling mold with certain spacing, opens on the outer coiling mold
Equipped with through-hole, the multimode fibre is wound in after the interior coiling mold and is wound in the outer coiling mold across the through-hole
On, so that the multimode fibre forms the minor radius coil section being wound on the interior coiling mold and is wound in the external disk
Around the large radius coil section of mold.
Compared with prior art, the method that the present invention uses hyperbolicity to coil, using multimode fibre as transmission medium, according to
Two different radiuses coil it in advance.Since the decaying radius of higher mode is greater than basic mode, minor radius coil section can
Effectively decayed with the higher mode ingredient that will be coupled into advance into optical fiber, filters out the low order to large radius bend-insensitive
Mould.The large radius coil section of another relatively large radius eliminates the bending transmission mould that a upper link may excite.Under the two cooperation,
It is final to realize multimode fibre to the inhibition of higher mode and stablize output.Furthermore the invention enables treated by disappearing mould light letters
Number, optical fiber with mechanical platform to entire wave shifting fiber flat scanning during, even if causing fibre-optical bending in different location, light is defeated
Power is always consistent out, surveys so that not needing additional other detectors auxiliary in the quick nuclear detector of measurement flashing position
Position etc. is measured referring to information.
Preferably, the fibre-optical bending disappears, mold device further includes the centered cylinder and fixation in the interior coiling mold
The pedestal of the centered cylinder, interior coiling mold and outer coiling mold.
Preferably, the fibre-optical bending disappears, mold device further includes that the multiple optical fiber being formed on the outside of the outer coiling mold are consolidated
Determine item.
Preferably, one optical module of termination of the multimode fibre, another termination collimator, the optical module will
Optical signal decayed, polarized, expand processing after be delivered to the multimode fibre, the multimode fibre handles the optical signal mould that disappears
After be delivered to the optical fiber collimator, the optical fiber collimator exports after the optical signal is carried out collimation processing.Optical signals
Pulse laser provides, and when due to practical neutron detection, the number of photons of scintillator capture only has between 8000 to 12000, power
It is very low, so the output power of laser such as has to pass through decaying, polarizes, expands, collimating at the processing, about by laser power decaying
4 orders of magnitude are simultaneously accurately positioned on desired irradiation position.
Wherein, the fibre-optical bending disappear mold device can be used for neutron (-detecting) phosphor position sensitive detector calibration system optical fiber pass
It is defeated.
Detailed description of the invention
Fig. 1 is that fibre-optical bending of the present invention disappears the structural schematic diagram of mold device.
Fig. 2 is that fibre-optical bending of the present invention disappears the structural schematic diagram of another angle of mold device.
Fig. 3 is that middle fibre-optical bending of the present invention disappears the structural schematic diagram of another embodiment of mold device.
Specific embodiment
In order to describe the technical content, the structural feature, the achieved object and the effect of this invention in detail, below in conjunction with embodiment
And attached drawing is cooperated to be explained in detail.
With reference to Fig. 1 and Fig. 2, disappear mold device 100 the invention discloses a kind of fibre-optical bending, the interior coiling mold including annular
11, outer coiling mold 12 and multimode fibre 15 on the interior coiling mold 11, the outer coiling mould are surrounded on certain spacing
Through-hole 13 is offered on tool 12, another part passes through institute after described 15 a part of multimode fibre is wound in the interior coiling mold 11
It states through-hole 13 to be wound on the outer coiling mold 12, so that the formation of the multimode fibre 15 is wound in the interior coiling mold 11
On minor radius coil section and be wound in it is described it is outer coiling mold 12 large radius coil section.Wherein, due to the fibre of optical fiber
There is fine fluctuating in small range scale, slightly shake caused by external shock in core diameter very little, the light distribution of laser beam
It is unstable to shake the light ingredient for being likely to cause to be fed in optical fiber, uses core diameter/outer diameter for 62.5 μm/125 μ in the present embodiment
The multimode fibre of m.Since the decaying radius of higher mode is greater than basic mode, minor radius coil section can be will be coupled into advance into optical fiber
Higher mode ingredient effectively decayed, filter out the low order mode to large radius bend-insensitive.The coiling of another large radius
Partially remove the bending transmission mould that a link may excite.It is final to realize multimode fibre 15 to higher mode under the two cooperation
Inhibit and stablize output.Multimode fibre 15 is after coiling, and totally compared with high order mode attenuation, the light intensity of output tends towards stability no matter
Subsequent how to place multimode fibre outer segment part, output intensity has almost no change.
Wherein, interior 11 diameter of coiling mold is 82.5mm, 7 circle of the coiling of multimode fibre 15 in present embodiment；External disk
It is 97.5mm, 6 circle of the coiling of multimode fibre 15 around 12 diameter of mold.
It continues to refer to figure 1 and Fig. 2, the multimode fibre bending mold device 100 that disappears further includes being set to the interior coiling mold
The pedestal 17 of centered cylinder 10 and the fixed centered cylinder 10, interior coiling mold 11 and outer coiling mold 12 in 11.
With reference to Fig. 1, the fibre-optical bending mold device 100 that disappears further includes be formed in outer coiling mold 12 outside multiple
Optical fiber fixed strip 14.
With reference to Fig. 3, one optical module 18 of termination of the multimode fibre 15, another termination collimator 16, the light
Learn module 18 optical signal is decayed, is polarized, expand processing after be delivered to the multimode fibre 15, the multimode fibre 15 will
Optical signal, which disappears after mould is handled, is delivered to the optical fiber collimator 16, and the optical fiber collimator 16 carries out the optical signal at collimation
It is exported after reason.When due to practical neutron detection, the number of photons of scintillator capture only has between 8000 to 12000, and power is very low, institute
The processing such as decaying is had to pass through, polarized, expanded, collimate with the output power of laser, laser power is decayed about 4 quantity
Grade is simultaneously accurately positioned on desired irradiation position.
To sum up, the present invention divides a multimode fibre 15 to first half and latter half to be connected, by the multimode fibre
15 first half bending is wound the first coil section of an annular, and the latter half bending of the multimode fibre 15 is twined
Around the second coil section for forming an annular, the radius of second coil section is greater than the radius of first coil section,
So that second coil section is large radius coil section, first coil section is minor radius coil section, optical signal
It is coupled into after the multimode fibre 15 and successively carries out the mould processing that disappears by the minor radius coil section and large radius coil section.
Wherein, the optical signal is carried out to the specific steps for being bent the mould that disappears are as follows: optical signal is coupled into the multimode fibre 15
Afterwards, it is delivered to through the higher mode ingredient during the minor radius coil section decays the optical signal and after exciting bending transmission mould big
Radius coil section is filtering the bending transmission mould by the large radius coil section to form the light letter after being bent the mould that disappears
Number.
Wherein, further include before the optical signal being coupled into the multimode fibre 15, to the optical signal of laser output
Decayed, polarized, expanded.The optical signal also collimates optical signal after the multimode fibre 15 disappears mould processing
Processing.
Preferably, second coil section are curved around with a fixed spacing in outside first coil section.
Fibre-optical bending of the present invention disappear mold device cooperation optical module can modulate the light that intensity properly measures well
Signal output, and the various trigger modes realized and such as exported for demarcating the single photon of photomultiplier tube energy calibration can be extended
Formula either has flexible adaptability and broad application prospect in mass production or small-sized research and development test.
The above disclosure is only a preferred embodiment of the invention, cannot limit the right of the present invention with this certainly
Range, therefore according to equivalent variations made by scope of the present invention patent, it is still within the scope of the present invention.
Claims (7)
- The mold device 1. a kind of fibre-optical bending disappears, it is characterised in that: be surrounded on institute including annular interior coiling mold, with certain spacing The outer coiling mold and multimode fibre on interior coiling mold are stated, offers through-hole, the multimode fibre on the outer coiling mold It is wound on the outer coiling mold after being wound in the interior coiling mold across the through-hole, so that the multimode fibre is formed The minor radius coil section being wound on the interior coiling mold and the large radius coil section for being wound in the outer coiling mold, The minor radius coil section will be coupled into the higher mode ingredient into multimode fibre and decay, and the large radius coil section disappears Except mould is transmitted in the bending of minor radius coil section excitation.
- The mold device 2. fibre-optical bending as described in claim 1 disappears, it is characterised in that: further include being set in the interior coiling mold Centered cylinder and the fixed centered cylinder, interior coiling mold and outer coiling mold pedestal.
- The mold device 3. fibre-optical bending as described in claim 1 disappears, it is characterised in that: further include being formed in the outer coiling mold Multiple optical fiber fixed strips in outside.
- The mold device 4. fibre-optical bending as described in claim 1 disappears, it is characterised in that: one optics of termination of the multimode fibre Module, another termination collimator, optical signal decayed, polarized by the optical module, expand processing after be delivered to it is described Multimode fibre, the multimode fibre, which disappears optical signal, is delivered to the optical fiber collimator after mould is handled, the optical fiber collimator will The optical signal exports after carrying out collimation processing.
- A kind of mould method 5. fibre-optical bending disappears a, it is characterised in that: the following steps are included: multimode fibre to be divided into connected first half The first half bending of the multimode fibre is wound the first coil section of an annular, by institute by part and latter half The latter half bending for stating multimode fibre is wound the second coil section of an annular, the radius of second coil section Greater than the radius of first coil section, so that second coil section is large radius coil section, first coiling Part is minor radius coil section, and optical signal is coupled into after the multimode fibre successively by the minor radius coil section and big Radius coil section carries out the mould processing that disappears；The optical signal is carried out to the specific steps for being bent the mould that disappears are as follows: after optical signal is coupled into the multimode fibre, through described small Radius coil section, which is decayed, the higher mode ingredient in the optical signal and is delivered to large radius coiled portion after exciting bending transmission mould Point, the bending transmission mould is being filtered by the large radius coil section to form the optical signal after being bent the mould that disappears.
- The mould method 6. fibre-optical bending as claimed in claim 5 disappears, it is characterised in that: the optical signal before offseting mould processing also carries out Decay, polarize, expanding processing, also offseting mould treated that optical signal carries out collimation processing.
- The mould method 7. fibre-optical bending as claimed in claim 5 disappears, it is characterised in that: second coil section is with a fixed spacing It is surrounded on outside first coil section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710075206.4A CN106772550B (en) | 2017-02-10 | 2017-02-10 | Optical fiber bending mode eliminating device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710075206.4A CN106772550B (en) | 2017-02-10 | 2017-02-10 | Optical fiber bending mode eliminating device and method |
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| Publication Number | Publication Date |
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| CN106772550A CN106772550A (en) | 2017-05-31 |
| CN106772550B true CN106772550B (en) | 2019-02-22 |
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| CN201710075206.4A Expired - Fee Related CN106772550B (en) | 2017-02-10 | 2017-02-10 | Optical fiber bending mode eliminating device and method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110797735A (en) * | 2019-10-16 | 2020-02-14 | 佛山市宝光新宇实业有限公司 | Optical fiber laser and cooling device thereof |
| CN116539279B (en) * | 2023-03-13 | 2023-10-20 | 中国工程物理研究院激光聚变研究中心 | Measuring system and measuring method for absorption coefficient of cladding pumping light |
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|---|---|---|---|---|
| CN1054137A (en) * | 1990-02-12 | 1991-08-28 | 卡维·皮雷利有限公司 | The image intensifer that has single-mode curved active fibre |
| CN103746275A (en) * | 2014-01-26 | 2014-04-23 | 江苏天元激光科技有限公司 | Active optical fiber winding device and optical fiber winding method for optical fiber laser |
| CN105731188A (en) * | 2016-03-24 | 2016-07-06 | 江苏天元激光科技有限公司 | Winding device for active optical fiber and fiber winding method |
| CN105977770A (en) * | 2016-06-23 | 2016-09-28 | 中国人民解放军国防科学技术大学 | Cooling device for all-fiber amplifier |
| CN106159656A (en) * | 2016-08-19 | 2016-11-23 | 光惠（上海）激光科技有限公司 | A kind of optical fiber laser of high-photoelectric transformation efficiency |
-
2017
- 2017-02-10 CN CN201710075206.4A patent/CN106772550B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1054137A (en) * | 1990-02-12 | 1991-08-28 | 卡维·皮雷利有限公司 | The image intensifer that has single-mode curved active fibre |
| CN103746275A (en) * | 2014-01-26 | 2014-04-23 | 江苏天元激光科技有限公司 | Active optical fiber winding device and optical fiber winding method for optical fiber laser |
| CN105731188A (en) * | 2016-03-24 | 2016-07-06 | 江苏天元激光科技有限公司 | Winding device for active optical fiber and fiber winding method |
| CN105977770A (en) * | 2016-06-23 | 2016-09-28 | 中国人民解放军国防科学技术大学 | Cooling device for all-fiber amplifier |
| CN106159656A (en) * | 2016-08-19 | 2016-11-23 | 光惠（上海）激光科技有限公司 | A kind of optical fiber laser of high-photoelectric transformation efficiency |
Non-Patent Citations (1)
| Title |
|---|
| 对多模光纤弯曲损耗的分析;张晓光;《建筑科技与管理学术交流论文集》;20130731;27-30 * |
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