CN108318135A - A kind of optical-fiber laser on-line monitoring system - Google Patents
A kind of optical-fiber laser on-line monitoring system Download PDFInfo
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- CN108318135A CN108318135A CN201810043764.7A CN201810043764A CN108318135A CN 108318135 A CN108318135 A CN 108318135A CN 201810043764 A CN201810043764 A CN 201810043764A CN 108318135 A CN108318135 A CN 108318135A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 185
- 238000012544 monitoring process Methods 0.000 title claims abstract description 41
- 239000000835 fiber Substances 0.000 claims abstract description 159
- 230000005540 biological transmission Effects 0.000 claims abstract description 122
- 230000008878 coupling Effects 0.000 claims abstract description 51
- 238000010168 coupling process Methods 0.000 claims abstract description 51
- 238000005859 coupling reaction Methods 0.000 claims abstract description 51
- 239000000523 sample Substances 0.000 claims abstract description 34
- 238000003466 welding Methods 0.000 claims abstract description 30
- 230000004927 fusion Effects 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000005253 cladding Methods 0.000 claims description 27
- 238000005070 sampling Methods 0.000 claims description 13
- 239000003292 glue Substances 0.000 claims description 11
- 238000004804 winding Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 7
- 238000001228 spectrum Methods 0.000 description 11
- 238000005259 measurement Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000002310 reflectometry Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 102000012966 Growth Differentiation Factor 5 Human genes 0.000 description 1
- 108010090254 Growth Differentiation Factor 5 Proteins 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0425—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using optical fibers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J11/00—Measuring the characteristics of individual optical pulses or of optical pulse trains
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0218—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using optical fibers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of optical-fiber laser on-line monitoring systems.The system includes：Optical fiber laser, fiber optic samplers, probe unit, signal processing circuit and data acquisition process unit；The first Transmission Fibers being connect with laser generating member in optical fiber laser and the second Transmission Fibers being connect with laser export head connection, form fusion point, and the first transmission fiber spans, the second transmission fiber spans and fusion point constitute welding Transmission Fibers；Fiber optic samplers include at least one coupling optical fiber, and coupling optical fiber is bonded parallel with welding Transmission Fibers, or is wrapped in welding Transmission Fibers；Probe unit is connect with the coupling optical fiber in fiber optic samplers；Signal processing circuit is electrically connected with probe unit；Data acquisition process unit is electrically connected with signal processing circuit.The present invention includes at least one fiber optic samplers for coupling optical fiber by being arranged, and avoids and is inserted into optical device on emitting light path, reduces the complexity of system, and can carry out real time on-line monitoring to optical-fiber laser.
Description
Technical field
The present invention relates to fiber laser technology fields, more particularly to a kind of optical-fiber laser on-line monitoring system.
Background technology
In recent years, with the development of high-brightness semiconductor pump technology and doubly clad optical fiber technology of preparing, optical fiber laser
Output power broken through myriawatt magnitude.In the optical-fiber lasers application technology such as industrial processes, medical treatment and military affairs, optical fiber is realized
The real-time measurement of the parameters such as laser output power, output spectrum, pulse frequency, reflected optical power, while output energy is not reduced
It is particularly important, especially in laser research process, due to optical fiber laser output power, output spectrum, pulse frequency, anti-
Penetrate the parameters such as luminous power be judge the direct indicator of laser activity, therefore, it is necessary in real time to the above-mentioned parameter of optical-fiber laser into
Row measures.Design, manufacture, detection and application to laser etc. is monitored to optical-fiber laser in real time with highly important
Meaning.
Currently, the method for measuring generally use to optical-fiber laser is the side of beam splitting type on-line monitoring laser output power
Method, this method is using space structure and optical device, such as spectroscope are inserted on emitting light path, not only introduces so additional
Insertion loss, increase the complexity of system, it is often more important that output laser cause unnecessary disturbance, reduce output
Power influences subsequent applications.Therefore, in Practical Projectization application, existing beam splitting type on-line monitoring laser output power
Method is not appropriate for carrying out real time on-line monitoring to optical-fiber laser.
Invention content
Based on this, it is necessary to a kind of optical-fiber laser on-line monitoring system is provided, to realize the real-time online to optical-fiber laser
Monitoring.
To achieve the above object, the present invention provides following schemes：
A kind of optical-fiber laser on-line monitoring system, including：Optical fiber laser, fiber optic samplers, probe unit, signal processing
Circuit and data acquisition process unit；
The optical fiber laser includes laser generating member, the first Transmission Fibers, the second Transmission Fibers and laser export head,
The laser generating member is connect with one end of the first Transmission Fibers, the laser export head and the one of second Transmission Fibers
End connection, the other end of first Transmission Fibers are connect with the other end of second Transmission Fibers, formation fusion point, and first
Transmission fiber spans, the second transmission fiber spans and the fusion point constitute welding Transmission Fibers, and first transmission fiber spans are institute
The fiber segment that fusion point described in distance in the first Transmission Fibers is the first pre-determined distance is stated, second transmission fiber spans are described
Fusion point described in distance is the fiber segment of the second pre-determined distance in second Transmission Fibers；
The fiber optic samplers include at least one coupling optical fiber, and the coupling optical fiber and the welding Transmission Fibers are parallel
Fitting or the coupling Optical Fiber Winding form sampling optical fiber, the fiber optic samplers are for carrying in the welding Transmission Fibers
Scattering optical-fiber laser is taken, the scattering optical-fiber laser is the optical-fiber laser scattered at the fusion point；
The probe unit is connect with the coupling optical fiber in the fiber optic samplers, for receiving the scattering optical fiber
Laser, and detect the parameter of the scattering optical-fiber laser；
The signal processing circuit is electrically connected with the probe unit, the parameter for receiving the scattering optical-fiber laser,
And the parameter of the scattering optical-fiber laser is amplified；
The data acquisition process unit is electrically connected with the signal processing circuit, for acquiring the amplified scattering
The parameter of optical-fiber laser, and the parameter of the amplified scattering optical-fiber laser is handled.
Optionally, first Transmission Fibers and second Transmission Fibers are same type of optical fiber.
Optionally, first Transmission Fibers, second Transmission Fibers and the coupling optical fiber are including inner cladding
It is respectively less than the inner cladding of first Transmission Fibers with the diameter of the doubly clad optical fiber of surrounding layer, the inner cladding of the coupling optical fiber
Diameter and second Transmission Fibers inner cladding diameter.
Optionally, the outside of optical fiber of first Transmission Fibers in addition to first transmission fiber spans has coating
The outside of layer, optical fiber of second Transmission Fibers in addition to second transmission fiber spans has coat.
Optionally, the coupling optical fiber is removed is bonded or is wrapped in parallel the welding transmission light with the welding Transmission Fibers
The outside of optical fiber except on fibre has coat.
Optionally, sampling the external coated of optical fiber has uv-curable glue.
Optionally, it is described coupling optical fiber inner cladding refractive index be all higher than or equal to first Transmission Fibers interior packet
The refractive index of the refractive index of the refractive index of layer and the inner cladding of second Transmission Fibers, the uv-curable glue is respectively less than described
The refractive index of the inner cladding of the refractive index of the inner cladding of first Transmission Fibers and second Transmission Fibers.
Optionally, the probe unit includes positive laser power instrument, positive photodetector, spectrometer, reversed laser
One or more of power instrument and reversed photodetector.
Optionally, the system also includes the second probe unit, the second probe unit setting is exported in the laser
In the light path of the optical-fiber laser of head output, second probe unit is for obtaining the optical-fiber laser that the optical fiber laser is sent out
Parameter, and the parameter of the optical-fiber laser is sent to the signal processing circuit.
Optionally, second probe unit includes one kind or several in laser power instrument, photodetector and spectrometer
Kind.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention proposes a kind of optical-fiber laser on-line monitoring system, which includes：Optical fiber laser, sampling by optical fiber
Device, probe unit, signal processing circuit and data acquisition process unit；Connect with laser generating member in optical fiber laser
One Transmission Fibers and the second Transmission Fibers connection being connect with laser export head, form fusion point, the first transmission fiber spans, second
Transmission fiber spans constitute welding Transmission Fibers with fusion point；Fiber optic samplers include at least one coupling optical fiber, coupling optical fiber with
Welding Transmission Fibers are bonded parallel, or are wrapped in welding Transmission Fibers；Probe unit and the coupling optical fiber in fiber optic samplers
Connection；Signal processing circuit is electrically connected with probe unit；Data acquisition process unit is electrically connected with signal processing circuit.The present invention
Include at least one fiber optic samplers for coupling optical fiber by being arranged, avoid and be inserted into optical device on emitting light path, reduces
The complexity of system reduces and causes unnecessary disturbance to output laser, do not influence the application of follow-up optical-fiber laser, can
Real time on-line monitoring is carried out to optical-fiber laser.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structure of fiber optic samplers and probe unit in a kind of optical-fiber laser on-line monitoring system of the embodiment of the present invention
Figure；
Fig. 2 is a kind of structural schematic diagram of optical-fiber laser on-line monitoring system of the embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is the structure of fiber optic samplers and probe unit in a kind of optical-fiber laser on-line monitoring system of the embodiment of the present invention
Figure；Fig. 2 is a kind of structural schematic diagram of optical-fiber laser on-line monitoring system of the embodiment of the present invention.
Referring to Fig. 1 and Fig. 2, the optical-fiber laser on-line monitoring system of embodiment, including：Optical fiber laser, fiber optic samplers
6, probe unit 8, signal processing circuit 9, data acquisition process unit 10 and the second probe unit 11.
The optical fiber laser includes laser generating member 1, the first Transmission Fibers 2, the second Transmission Fibers 3 and laser output
First 4, first Transmission Fibers 2 and second Transmission Fibers 3 are same type of optical fiber, the laser generating member 1 with
One end of first Transmission Fibers 2 connects, and the laser export head 4 is connect with one end of second Transmission Fibers 3, and described first
The other end of Transmission Fibers 2 is connect with the other end of second Transmission Fibers 3, formation fusion point 5, the first transmission fiber spans,
Second transmission fiber spans constitute welding Transmission Fibers with the fusion point 5, and first transmission fiber spans are first transmission
Fusion point 5 described in distance is the fiber segment of the first pre-determined distance on optical fiber 2, and second transmission fiber spans are second transmission
Fusion point 5 described in distance is the fiber segment of the second pre-determined distance on optical fiber 3, and the fusion point 5 is located at the welding Transmission Fibers
Midpoint, the length of the welding Transmission Fibers is 1-20cm.
The fiber optic samplers 6 include at least one coupling optical fiber 7, the coupling optical fiber 7 and the welding Transmission Fibers
Parallel fitting or the coupling optical fiber 7 are wrapped in the welding Transmission Fibers, form sampling optical fiber, the sampling optical fiber
Length is 5-25cm, winding number of turns 1-15 circles, so that the coupling optical fiber 7 is fitted closely with the welding Transmission Fibers,
It is coupled between the inner cladding and the inner cladding of the welding Transmission Fibers of the coupling optical fiber 7 convenient for laser, the optical fiber takes
Sample device 6 is that the optical fiber scattered at the fusion point 5 swashs for extracting scattering optical-fiber laser, the scattering optical-fiber laser
Light.
In the present embodiment, first Transmission Fibers 2, second Transmission Fibers 3 and the coupling optical fiber 7 be including
The doubly clad optical fiber of inner cladding and surrounding layer；The diameter of the inner cladding of the coupling optical fiber 7 is respectively less than first Transmission Fibers 2
Inner cladding diameter and second Transmission Fibers 3 inner cladding diameter, the inner cladding of first Transmission Fibers 2 it is straight
The diameter of diameter and the inner cladding of second Transmission Fibers 3 is all higher than equal to 250 microns；The inner cladding of the coupling optical fiber 7
Refractive index be all higher than or equal to first Transmission Fibers 2 inner cladding refractive index and second Transmission Fibers 3 interior packet
The refractive index of layer；The outside of optical fiber of first Transmission Fibers 2 in addition to first transmission fiber spans has coat,
The outside of optical fiber of second Transmission Fibers 3 in addition to second transmission fiber spans has coat, the coupling light
The outside of optical fiber of the fibre 7 in addition to being bonded or being wrapped in parallel in the welding Transmission Fibers with the welding Transmission Fibers has
Coat.
In the present embodiment, first Transmission Fibers 2 and second Transmission Fibers 3 are relatively large in diameter so that optical fiber is rigid
Property it is not flexible by force, avoid generate loss；The diameter of the coupling optical fiber 7 is smaller, and flexible, when winding can pass with the welding
It loses fibre to fit closely, increases contact area, improve coupling efficiency.
In the present embodiment, sampling the external coated of optical fiber has uv-curable glue, the refractive index of the uv-curable glue
The respectively less than refractive index of the inner cladding of the refractive index and second Transmission Fibers 3 of the inner cladding of first Transmission Fibers 2, institute
The coating length for stating uv-curable glue is more than the length of the sampling optical fiber, and the uv-curable glue is used to restore the double-contracting of optical fiber
Layer structure.
The probe unit 8 is connect with the coupling optical fiber 7 in the fiber optic samplers 6, for receiving the scattering
Optical-fiber laser, and the parameter of the scattering optical-fiber laser is detected, the parameter of the scattering optical-fiber laser includes output power, pulse
Frequency, spectrum, reversed luminous power and reverse impulse frequency.
The probe unit 8 includes positive laser power instrument 81, positive photodetector 82, spectrometer 83, reversed laser
One kind in power instrument 84, reversed photodetector 85, other positive coupled detectors 86 and other reverse coupled detectors 87
Or it is several；The forward direction laser power instrument 81, the positive photodetector 82, the spectrometer 83 and other forward direction couplings
Detector is connect by the positive coupling optical fiber 7 in the fiber optic samplers 6 with fusion point 5, the reversed laser power instrument
84, the reversed photodetector 85 and other reverse coupled detectors pass through the reversed coupling in the fiber optic samplers 6
Closing light fibre 7 is connect with fusion point 5；The forward direction laser power instrument 81 and reversed laser power instrument 84 are respectively used to detect described dissipate
The output power of optical-fiber laser and reversed luminous power are penetrated, the forward direction photodetector 82 and the reversed photodetector 85 divide
The pulse frequency and reverse impulse frequency of the scattering optical-fiber laser Yong Yu not be detected, the spectrometer 83 is for detecting described dissipate
The spectrum of optical-fiber laser is penetrated, the specific installation warrants of the probe unit 8 need the design parameter of the scattering optical-fiber laser monitored
To determine.
The signal processing circuit is electrically connected with the probe unit 8, the parameter for receiving the scattering optical-fiber laser,
And the parameter of the scattering optical-fiber laser is amplified.
The data acquisition process unit 10 is electrically connected with the signal processing circuit, amplified described scattered for acquiring
The parameter of optical-fiber laser is penetrated, and the parameter of the amplified scattering optical-fiber laser is handled.
Second probe unit 11 is arranged in the light path for the optical-fiber laser that the laser export head 4 exports, and described
Two probe units 11 are used to obtain the parameter of the optical-fiber laser that the optical fiber laser is sent out, and by the parameter of the optical-fiber laser
It is sent to the signal processing circuit, second probe unit 11 includes in laser power instrument, photodetector and spectrometer
One or more.
In the present embodiment, the signal processing circuit receives the optical-fiber laser that second probe unit 11 is sent
After parameter, by processing, the ginseng of the parameter and the scattering optical-fiber laser of the optical-fiber laser that the optical fiber laser is sent out is obtained
Relationship between number, according to the real time on-line monitoring of the relational implementation between them, monitoring accuracy higher.
In specific monitoring process, the first Transmission Fibers 2 and the second Transmission Fibers 3 are NufernLMA-GDF-20/
The length of 400-M doubly clad optical fibers, the welding Transmission Fibers is 6cm, and coupling optical fiber 7 is single NufernSM-GDF-5/130
Doubly clad optical fiber, the coupling optical fiber 7 are wrapped in the welding Transmission Fibers, form sampling optical fiber, the sampling optical fiber
Length is 8cm, and the winding number of turns is 3 circles, applies low-refraction uv-curable glue and cures, and coating length is 8cm.It is defeated by measuring
Go out laser power and positive coupled laser power, obtains relationship between the two, specially：Positive coupled laser power=output
Laser power × 0.00034；Laser power, laser illuminated surface reflectivity and reverse coupled laser power are exported by measurement
Spectrum obtains the relationship between three, specially：Reverse coupled laser power=output laser power × 0.00034 × laser
Irradiate surface reflectivity；The positive photodetector of forward direction coupling optical fiber connection, carries out counting to pulse signal and measures pulse laser
Frequency；Forward direction coupling optical fiber connection spectrometer measurement obtains output laser spectrum.In the monitoring process, realizes and optical fiber is swashed
The on-line real time monitoring of optical output power, spectrum, reflected optical power and pulse frequency.
In specific monitoring process, the first Transmission Fibers 2 and the second Transmission Fibers 3 can also each be NufernLMA-
The length of GDF-25/400+ doubly clad optical fibers, the welding Transmission Fibers is 10cm；Coupling optical fiber 7 is two NufernSM-
GDF-5/130 doubly clad optical fibers are stated coupling optical fiber 7 and are wrapped in the welding Transmission Fibers, form sampling optical fiber, the sampling
The length of optical fiber is 14cm, and the winding number of turns is 7 circles, applies low-refraction uv-curable glue and cures, and coating length is 15cm.It is logical
Measurement output laser power and positive coupled laser power are crossed, obtains relationship between the two, specially：Positive coupled laser work(
Rate=output laser power × 0.00052；Laser power, laser illuminated surface reflectivity and reverse coupled are exported by measurement to swash
The spectrum of luminous power obtains the relationship between three, specially：Reverse coupled laser power=output laser power ×
0.00052 × laser illuminated surface reflectivity；The positive photodetector of forward direction coupling optical fiber connection, counts pulse signal
Measure pulse laser frequency；Forward direction coupling optical fiber connection spectrometer measurement obtains output laser spectrum.In the monitoring process, together
Sample is realized realizes on-line real time monitoring to optical fiber laser output power, spectrum, reflected optical power and pulse frequency.
Optical-fiber laser on-line monitoring system in the present embodiment, has the following advantages：
1) output power of high power optical fibre laser can be sampled and is monitored on-line with real-time undisturbed, avoided to rear
The influence of continuous laser application；The reflection power of high-capacity optical fiber laser can be sampled and real time on-line monitoring, be avoided
Laser reflection is damaged and is influenced caused by laser；Real-time undisturbed can be carried out to the output spectrum of optical fiber laser to supervise online
It surveys, avoids the influence applied to post laser；It is online real-time undisturbed to be carried out to the output frequency of pulse optical fiber
Monitoring, avoids the influence applied to post laser.
2) optical-fiber laser of a variety of different wave lengths can be used for by replacement different type and the detector of different operating wavelength
Monitoring.
3) number of devices in fiber ring laser system light path can be reduced, the complexity of optical fiber laser is reduced, avoids
Insertion loss is introduced, all -fiber cramped construction of fiber laser system is kept.
4) Irradiation of High need not be born, no laser damage threshold problem can be used for high power, the optical fiber of high-energy swashs
Light samples and on-line monitoring.
5) it can need to be improved fiber optic samplers, signal processing circuit according to practical measurement, such as the choosing of Coupling point
It takes, couple fiber lengths, the winding number of turns, coupling fibre diameter, coupling number of fibers, coupling optical fibre refractivity, uv-curable glue
The enlargement ratio etc. of amplifying circuit in refractive index, signal processing circuit, further increases substantially the technical indicator of system, including
Resolution ratio, sensitivity etc..
6) accurate measure and control device is not needed, coupling Optical Fiber Winding and coating need to be only completed, method is convenient, simple in structure,
At low cost and easy implementation.
Principle and implementation of the present invention are described for specific case used herein, and above example is said
The bright method and its core concept for being merely used to help understand the present invention；Meanwhile for those of ordinary skill in the art, foundation
The thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (10)
1. a kind of optical-fiber laser on-line monitoring system, which is characterized in that including：Optical fiber laser, fiber optic samplers, detection are single
Member, signal processing circuit and data acquisition process unit；
The optical fiber laser includes laser generating member, the first Transmission Fibers, the second Transmission Fibers and laser export head, described
Laser generating member is connect with one end of the first Transmission Fibers, and one end of the laser export head and second Transmission Fibers connects
It connects, the other end of first Transmission Fibers is connect with the other end of second Transmission Fibers, forms fusion point, the first transmission
Fiber segment, the second transmission fiber spans and the fusion point constitute welding Transmission Fibers, and first transmission fiber spans are described the
Fusion point described in distance is the fiber segment of the first pre-determined distance in one Transmission Fibers, and second transmission fiber spans are described second
Fusion point described in distance is the fiber segment of the second pre-determined distance in Transmission Fibers；
The fiber optic samplers include at least one coupling optical fiber, and the coupling optical fiber pastes parallel with the welding Transmission Fibers
It closes or the coupling Optical Fiber Winding is in the welding Transmission Fibers, form sampling optical fiber, the fiber optic samplers are for extracting
Optical-fiber laser is scattered, the scattering optical-fiber laser is the optical-fiber laser scattered at the fusion point；
The probe unit is connect with the coupling optical fiber in the fiber optic samplers, is swashed for receiving the scattering optical fiber
Light, and detect the parameter of the scattering optical-fiber laser；
The signal processing circuit is electrically connected with the probe unit, the parameter for receiving the scattering optical-fiber laser, and right
The parameter of the scattering optical-fiber laser is amplified；
The data acquisition process unit is electrically connected with the signal processing circuit, for acquiring the amplified scattering optical fiber
The parameter of laser, and the parameter of the amplified scattering optical-fiber laser is handled.
2. a kind of optical-fiber laser on-line monitoring system according to claim 1, which is characterized in that first Transmission Fibers
It is same type of optical fiber with second Transmission Fibers.
3. a kind of optical-fiber laser on-line monitoring system according to claim 2, which is characterized in that the first transmission light
Fine, described second Transmission Fibers and the coupling optical fiber are the doubly clad optical fiber including inner cladding and surrounding layer, the coupling
The diameter of the inner cladding of optical fiber be respectively less than the inner cladding of first Transmission Fibers diameter and second Transmission Fibers it is interior
The diameter of covering.
4. a kind of optical-fiber laser on-line monitoring system according to claim 1, which is characterized in that first Transmission Fibers
There is coat, second Transmission Fibers to be passed except described second for the outside of optical fiber in addition to first transmission fiber spans
The outside of optical fiber except defeated fiber segment has coat.
5. a kind of optical-fiber laser on-line monitoring system according to claim 1, which is characterized in that the coupling optical fiber remove with
The welding Transmission Fibers be bonded or be wrapped in parallel in the welding Transmission Fibers except optical fiber outside have coat.
6. a kind of optical-fiber laser on-line monitoring system according to claim 3, which is characterized in that outside the sampling optical fiber
Portion is coated with uv-curable glue.
7. a kind of optical-fiber laser on-line monitoring system according to claim 6, which is characterized in that described to couple the interior of optical fiber
The refractive index of covering be all higher than or equal to first Transmission Fibers inner cladding refractive index and second Transmission Fibers
The refractive index of inner cladding, the refractive index of the uv-curable glue be respectively less than the inner cladding of first Transmission Fibers refractive index and
The refractive index of the inner cladding of second Transmission Fibers.
8. a kind of optical-fiber laser on-line monitoring system according to claim 1, which is characterized in that the probe unit includes
Positive laser power instrument, positive photodetector, spectrometer, reversed laser power instrument and one kind in reversed photodetector or
It is several.
9. a kind of optical-fiber laser on-line monitoring system according to claim 1, which is characterized in that the system also includes
Two probe units, second probe unit are arranged in the light path for the optical-fiber laser that the laser export head exports, and described
Two probe units are used to obtain the parameter for the optical-fiber laser that the optical fiber laser is sent out, and the parameter of the optical-fiber laser is sent out
It send to the signal processing circuit.
10. a kind of optical-fiber laser on-line monitoring system according to claim 9, which is characterized in that second detection is single
Member includes one or more of laser power instrument, photodetector and spectrometer.
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| CN111474625A (en) * | 2020-03-02 | 2020-07-31 | 华中科技大学 | Multiband transmission optical fiber and preparation method thereof |
| CN113504033A (en) * | 2021-09-13 | 2021-10-15 | 睿贸恒诚(山东)科技发展有限责任公司 | Optical fiber laser on-line monitoring system |
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| US20120026482A1 (en) * | 2010-04-05 | 2012-02-02 | George Franklin Dailey | Use of fiber optic sensor techniques for monitoring and diagnostics of large AC generators |
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