CN108318135B - Optical fiber laser on-line monitoring system - Google Patents
Optical fiber laser on-line monitoring system Download PDFInfo
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- CN108318135B CN108318135B CN201810043764.7A CN201810043764A CN108318135B CN 108318135 B CN108318135 B CN 108318135B CN 201810043764 A CN201810043764 A CN 201810043764A CN 108318135 B CN108318135 B CN 108318135B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 191
- 238000012544 monitoring process Methods 0.000 title claims abstract description 38
- 239000000835 fiber Substances 0.000 claims abstract description 153
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- 230000008878 coupling Effects 0.000 claims abstract description 67
- 238000010168 coupling process Methods 0.000 claims abstract description 67
- 238000005859 coupling reaction Methods 0.000 claims abstract description 67
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 238000012545 processing Methods 0.000 claims abstract description 34
- 238000003466 welding Methods 0.000 claims abstract description 17
- 238000007526 fusion splicing Methods 0.000 claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 10
- 238000005253 cladding Methods 0.000 claims description 33
- 230000004927 fusion Effects 0.000 claims description 20
- 238000005070 sampling Methods 0.000 claims description 12
- 239000011247 coating layer Substances 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 description 9
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- 230000003321 amplification Effects 0.000 description 1
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- 230000035945 sensitivity Effects 0.000 description 1
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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
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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
- G01J1/02—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
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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
- G01J3/02—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
Abstract
The invention discloses an optical fiber laser online monitoring system. The system comprises: the device comprises a fiber laser, a fiber sampler, a detection unit, a signal processing circuit and a data acquisition and processing unit; the first transmission optical fiber connected with the laser generating component and the second transmission optical fiber connected with the laser output head in the optical fiber laser are connected to form a welding point, and the first transmission optical fiber section, the second transmission optical fiber section and the welding point form a welding transmission optical fiber; the optical fiber sampler comprises at least one coupling optical fiber, and the coupling optical fiber is attached to the fusion splicing transmission optical fiber in parallel or wound on the fusion splicing transmission optical fiber; the detection unit is connected with the coupling optical fiber in the optical fiber sampler; the signal processing circuit is electrically connected with the detection unit; the data acquisition processing unit is electrically connected with the signal processing circuit. The optical fiber sampler provided by the invention comprises at least one coupling optical fiber, so that an optical device is prevented from being inserted into an emergent light path, the complexity of the system is reduced, and the real-time online monitoring on the optical fiber laser can be realized.
Description
Technical Field
The invention relates to the technical field of fiber lasers, in particular to an optical fiber laser on-line monitoring system.
Background
In recent years, with the development of high-brightness semiconductor pumping technology and double-clad fiber preparation technology, the output power of fiber lasers has broken through the ten-thousand watt level. In the fiber laser application technologies of industrial processing, medical treatment, military affairs and the like, it is very important to realize real-time measurement of parameters such as fiber laser output power, output spectrum, pulse frequency, reflected light power and the like without reducing output energy, and especially in the laser research process, because the parameters such as fiber laser output power, output spectrum, pulse frequency, reflected light power and the like are direct indexes for judging laser performance, the parameters of the fiber laser must be measured in real time. The real-time monitoring of the fiber laser is of great significance to the design, manufacture, detection, application and the like of the laser.
At present, the method generally adopted for measuring the fiber laser is a method for on-line monitoring the output power of the laser in a light splitting mode, and the method adopts a space structure and inserts an optical device, such as a spectroscope, into an emergent light path, so that not only is extra insertion loss introduced, but also the complexity of a system is increased, more importantly, unnecessary disturbance is caused to the output laser, the output power is reduced, and the subsequent application is influenced. Therefore, in practical engineering applications, the existing spectroscopic online laser output power monitoring method is not suitable for real-time online monitoring of fiber laser.
Disclosure of Invention
Based on this, there is a need to provide an on-line fiber laser monitoring system to realize real-time on-line monitoring of fiber laser.
In order to achieve the purpose, the invention provides the following scheme:
a fiber laser on-line monitoring system, comprising: the device comprises a fiber laser, a fiber sampler, a detection unit, a signal processing circuit and a data acquisition and processing unit;
the optical fiber laser comprises a laser generating component, a first transmission optical fiber, a second transmission optical fiber and a laser output head, wherein the laser generating component is connected with one end of the first transmission optical fiber, the laser output head is connected with one end of the second transmission optical fiber, the other end of the first transmission optical fiber is connected with the other end of the second transmission optical fiber to form a fusion joint, a first transmission optical fiber section, a second transmission optical fiber section and the fusion joint form a fusion-spliced transmission optical fiber, the first transmission optical fiber section is an optical fiber section which is on the first transmission optical fiber and is a first preset distance away from the fusion joint, and the second transmission optical fiber section is an optical fiber section which is on the second transmission optical fiber and is a second preset distance away from the fusion joint;
the optical fiber sampler comprises at least one coupling optical fiber, the coupling optical fiber is attached to the fusion splicing transmission optical fiber in parallel, or the coupling optical fiber is wound on the fusion splicing transmission optical fiber to form a sampling optical fiber, the optical fiber sampler is used for extracting scattering optical fiber laser, and the scattering optical fiber laser is optical fiber laser scattered at the fusion splicing point;
the detection unit is connected with the coupling optical fiber in the optical fiber sampler and is used for receiving the scattering optical fiber laser and detecting the parameters of the scattering optical fiber laser;
the signal processing circuit is electrically connected with the detection unit and is used for receiving the parameters of the scattering fiber laser and amplifying the parameters of the scattering fiber laser;
the data acquisition processing unit is electrically connected with the signal processing circuit and is used for acquiring the amplified parameters of the scattering fiber laser and processing the amplified parameters of the scattering fiber laser.
Optionally, the first transmission fiber and the second transmission fiber are the same type of fiber.
Optionally, the first transmission fiber, the second transmission fiber and the coupling fiber are double-clad fibers each including an inner cladding and an outer cladding, and the diameters of the inner claddings of the coupling fibers are smaller than the diameters of the inner claddings of the first transmission fiber and the second transmission fiber.
Optionally, the first transmission optical fiber has a coating layer on the outside of the optical fiber except for the first transmission optical fiber segment, and the second transmission optical fiber has a coating layer on the outside of the optical fiber except for the second transmission optical fiber segment.
Optionally, the coupling fiber has a coating layer on the outside of the fiber except for the fiber attached in parallel to the fusion splicing transmission fiber or wound around the fusion splicing transmission fiber.
Optionally, the sampling optical fiber is coated with an ultraviolet curing adhesive on the outside.
Optionally, the refractive index of the inner cladding of the coupling optical fiber is greater than or equal to the refractive index of the inner cladding of the first transmission optical fiber and the refractive index of the inner cladding of the second transmission optical fiber, and the refractive index of the ultraviolet curing glue is less than the refractive index of the inner cladding of the first transmission optical fiber and the refractive index of the inner cladding of the second transmission optical fiber.
Optionally, the detection unit includes one or more of a forward laser power meter, a forward photodetector, a spectrometer, a backward laser power meter, and a backward photodetector.
Optionally, the system further includes a second detection unit, the second detection unit is disposed on an optical path of the fiber laser output by the laser output head, and the second detection unit is configured to acquire a parameter of the fiber laser emitted by the fiber laser and send the parameter of the fiber laser to the signal processing circuit.
Optionally, the second detection unit includes one or more of a laser power meter, a photodetector, and a spectrometer.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an optical fiber laser on-line monitoring system, which comprises: the device comprises a fiber laser, a fiber sampler, a detection unit, a signal processing circuit and a data acquisition and processing unit; the first transmission optical fiber connected with the laser generating component and the second transmission optical fiber connected with the laser output head in the optical fiber laser are connected to form a welding point, and the first transmission optical fiber section, the second transmission optical fiber section and the welding point form a welding transmission optical fiber; the optical fiber sampler comprises at least one coupling optical fiber, and the coupling optical fiber is attached to the fusion splicing transmission optical fiber in parallel or wound on the fusion splicing transmission optical fiber; the detection unit is connected with the coupling optical fiber in the optical fiber sampler; the signal processing circuit is electrically connected with the detection unit; the data acquisition processing unit is electrically connected with the signal processing circuit. The optical fiber sampler comprising at least one coupling optical fiber is arranged, so that an optical device is prevented from being inserted into an emergent light path, the complexity of the system is reduced, unnecessary disturbance to output laser is reduced, the application of subsequent optical fiber laser is not influenced, and the real-time online monitoring on the optical fiber laser can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a structural diagram of an optical fiber sampler and a detection unit in an optical fiber laser on-line monitoring system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an optical fiber laser online monitoring system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
FIG. 1 is a structural diagram of an optical fiber sampler and a detection unit in an optical fiber laser on-line monitoring system according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of an optical fiber laser online monitoring system according to an embodiment of the present invention.
Referring to fig. 1 and 2, the fiber laser online monitoring system of the embodiment includes: the device comprises a fiber laser, a fiber sampler 6, a detection unit 8, a signal processing circuit 9, a data acquisition processing unit 10 and a second detection unit 11.
The optical fiber laser comprises a laser generating component 1, a first transmission optical fiber 2, a second transmission optical fiber 3 and a laser output head 4, wherein the first transmission optical fiber 2 and the second transmission optical fiber 3 are optical fibers of the same type, the laser generating component 1 is connected with one end of the first transmission optical fiber 2, the laser output head 4 is connected with one end of the second transmission optical fiber 3, the other end of the first transmission optical fiber 2 is connected with the other end of the second transmission optical fiber 3 to form a welding point 5, the first transmission optical fiber section, the second transmission optical fiber section and the welding point 5 form a welding transmission optical fiber, the first transmission optical fiber section is an optical fiber section which is on the first transmission optical fiber 2 and is a first preset distance away from the welding point 5, the second transmission optical fiber section is an optical fiber section which is on the second transmission optical fiber 3 and is a second preset distance away from the welding point 5, the fusion point 5 is located at the midpoint of the fusion transmission fiber, and the length of the fusion transmission fiber is 1-20 cm.
The optical fiber sampler 6 comprises at least one coupling optical fiber 7, the coupling optical fiber 7 is attached to the fusion splicing transmission optical fiber in parallel, or the coupling optical fiber 7 is wound on the fusion splicing transmission optical fiber to form a sampling optical fiber, the length of the sampling optical fiber is 5-25cm, and the number of winding turns is 1-15, so that the coupling optical fiber 7 is closely attached to the fusion splicing transmission optical fiber, laser is conveniently coupled between an inner cladding of the coupling optical fiber 7 and an inner cladding of the fusion splicing transmission optical fiber, the optical fiber sampler 6 is used for extracting scattering optical fiber laser, and the scattering optical fiber laser is optical fiber laser scattered at the fusion splicing point 5.
In this embodiment, the first transmission fiber 2, the second transmission fiber 3 and the coupling fiber 7 are double-clad fibers each including an inner cladding and an outer cladding; the diameters of the inner cladding of the coupling fiber 7 are smaller than the diameters of the inner cladding of the first transmission fiber 2 and the inner cladding of the second transmission fiber 3, and the diameters of the inner cladding of the first transmission fiber 2 and the inner cladding of the second transmission fiber 3 are larger than or equal to 250 micrometers; the refractive index of the inner cladding of the coupling fiber 7 is greater than or equal to the refractive index of the inner cladding of the first transmission fiber 2 and the refractive index of the inner cladding of the second transmission fiber 3; the first transmission fiber 2 has a coating layer on the outside of the fiber except the first transmission fiber section, the second transmission fiber 3 has a coating layer on the outside of the fiber except the second transmission fiber section, and the coupling fiber 7 has a coating layer on the outside of the fiber except the fiber attached in parallel to or wound around the fusion spliced transmission fiber.
In this embodiment, the diameters of the first transmission optical fiber 2 and the second transmission optical fiber 3 are large, so that the optical fibers have strong rigidity and are not easy to bend, and loss is avoided; the coupling optical fiber 7 is small in diameter and easy to bend, can be tightly attached to the fusion welding transmission optical fiber during winding, increases the contact area and improves the coupling efficiency.
In this embodiment, the outside of sample optic fibre is scribbled and is glued to the ultraviolet curing, the refracting index that the ultraviolet curing was glued all is less than the refracting index of the inner cladding of first transmission optic fibre 2 with the refracting index of the inner cladding of second transmission optic fibre 3, the length of coating that the ultraviolet curing was glued is greater than the length of sample optic fibre, the ultraviolet curing is glued and is used for recovering the double-clad structure of optic fibre.
The detection unit 8 is connected to the coupling fiber 7 in the fiber sampler 6, and is configured to receive the scattering fiber laser and detect parameters of the scattering fiber laser, where the parameters of the scattering fiber laser include output power, pulse frequency, spectrum, backward light power, and backward pulse frequency.
The detection unit 8 comprises one or more of a forward laser power meter 81, a forward photoelectric detector 82, a spectrometer 83, a reverse laser power meter 84, a reverse photoelectric detector 85, other forward coupling detectors 86 and other reverse coupling detectors 87; the forward laser power meter 81, the forward photoelectric detector 82, the spectrometer 83 and other forward coupling detectors are all connected with the fusion point 5 through a forward coupling optical fiber 7 in the optical fiber sampler 6, and the reverse laser power meter 84, the reverse photoelectric detector 85 and other reverse coupling detectors are all connected with the fusion point 5 through a reverse coupling optical fiber 7 in the optical fiber sampler 6; the forward laser power meter 81 and the backward laser power meter 84 are respectively configured to detect the output power and the backward light power of the scattering fiber laser, the forward photodetector 82 and the backward photodetector 85 are respectively configured to detect the pulse frequency and the backward pulse frequency of the scattering fiber laser, the spectrometer 83 is configured to detect the spectrum of the scattering fiber laser, and the specific setting of the detection unit 8 is determined according to the specific parameter of the scattering fiber laser to be monitored.
The signal processing circuit is electrically connected with the detection unit 8 and is used for receiving the parameters of the scattering fiber laser and amplifying the parameters of the scattering fiber laser.
The data acquisition and processing unit 10 is electrically connected to the signal processing circuit and is configured to acquire the amplified parameters of the scattering fiber laser and process the amplified parameters of the scattering fiber laser.
The second detection unit 11 is disposed on a light path of the fiber laser output by the laser output head 4, the second detection unit 11 is configured to acquire parameters of the fiber laser emitted by the fiber laser and send the parameters of the fiber laser to the signal processing circuit, and the second detection unit 11 includes one or more of a laser power meter, a photoelectric detector and a spectrometer.
In this embodiment, after receiving the parameters of the fiber laser sent by the second detection unit 11, the signal processing circuit performs processing to obtain the relationship between the parameters of the fiber laser sent by the fiber laser and the parameters of the scattering fiber laser, and the monitoring precision is higher according to the real-time online monitoring realized by the relationship between the parameters of the fiber laser and the parameters of the scattering fiber laser.
In a specific monitoring process, the first transmission fiber 2 and the second transmission fiber 3 are both NufernLMA-GDF-20/400-M double-clad fibers, the length of the fusion-spliced transmission fiber is 6cm, the coupling fiber 7 is a single NufernSM-GDF-5/130 double-clad fiber, the coupling fiber 7 is wound on the fusion-spliced transmission fiber to form a sampling fiber, the length of the sampling fiber is 8cm, the number of winding turns is 3, low-refractive-index ultraviolet curing glue is coated and cured, and the coating length is 8 cm. The relation between the output laser power and the forward coupling laser power is obtained by measuring the output laser power and the forward coupling laser power, and the relation specifically comprises the following steps: the forward coupling laser power is equal to the output laser power multiplied by 0.00034; the relationship among the output laser power, the laser irradiation surface reflectivity and the optical system of the reverse coupling laser power is obtained by measuring the optical system of the output laser power, the laser irradiation surface reflectivity and the reverse coupling laser power, and the relationship is specifically as follows: the reverse coupling laser power is equal to the output laser power multiplied by 0.00034 multiplied by the laser irradiation surface reflectivity; the forward coupling optical fiber is connected with the forward photoelectric detector, and the pulse signals are counted to obtain the pulse laser frequency; and the forward coupling optical fiber is connected with a spectrometer to measure and obtain an output laser spectrum. In the monitoring process, the online real-time monitoring of the output power, the spectrum, the reflected light power and the pulse frequency of the fiber laser is realized.
In a specific monitoring process, the first transmission fiber 2 and the second transmission fiber 3 can be NufernLMA-GDF-25/400+ double-clad fibers, and the length of the fusion welding transmission fiber is 10 cm; the coupling optical fiber 7 is two NufernSM-GDF-5/130 double-clad optical fibers, the coupling optical fiber 7 is wound on the fusion welding transmission optical fiber to form a sampling optical fiber, the length of the sampling optical fiber is 14cm, the number of winding turns is 7, low-refractive-index ultraviolet curing glue is coated and cured, and the coating length is 15 cm. The relation between the output laser power and the forward coupling laser power is obtained by measuring the output laser power and the forward coupling laser power, and the relation specifically comprises the following steps: the forward coupling laser power is equal to the output laser power multiplied by 0.00052; the relationship among the output laser power, the laser irradiation surface reflectivity and the optical system of the reverse coupling laser power is obtained by measuring the optical system of the output laser power, the laser irradiation surface reflectivity and the reverse coupling laser power, and the relationship is specifically as follows: the power of the reverse coupling laser is equal to the power of the output laser multiplied by 0.00052 multiplied by the reflectivity of the laser irradiation surface; the forward coupling optical fiber is connected with the forward photoelectric detector, and the pulse signals are counted to obtain the pulse laser frequency; and the forward coupling optical fiber is connected with a spectrometer to measure and obtain an output laser spectrum. In the monitoring process, the online real-time monitoring of the output power, the spectrum, the reflected light power and the pulse frequency of the fiber laser is realized.
The optical fiber laser online monitoring system in the embodiment has the following advantages:
1) the output power of the high-power fiber laser can be sampled and monitored on line in real time without disturbance, so that the influence on the subsequent laser application is avoided; the device can sample and monitor the reflected power of the high-power optical fiber laser on line in real time, and avoids the damage and influence of laser reflection on the laser; the output spectrum of the fiber laser can be monitored on line in real time without disturbance, so that the influence on subsequent laser application is avoided; the output frequency of the pulse fiber laser can be monitored on line in real time without disturbance, and the influence on subsequent laser application is avoided.
2) The detector with different types and different working wavelengths can be replaced for monitoring the optical fiber laser with various wavelengths.
3) The device number in the optical path of the optical fiber laser system can be reduced, the complexity of the optical fiber laser is reduced, the insertion loss is avoided, and the full optical fiber compact structure of the optical fiber laser system is kept.
4) The method does not need to bear strong laser irradiation, does not have the problem of laser damage threshold, and can be used for high-power and high-energy optical fiber laser sampling and online monitoring.
5) The optical fiber sampler and the signal processing circuit can be improved according to actual measurement requirements, such as selection of coupling points, coupling optical fiber length, winding turns, coupling optical fiber diameter, coupling optical fiber quantity, coupling optical fiber refractive index, ultraviolet curing adhesive refractive index, amplification factor of an amplifying circuit in the signal processing circuit and the like, and technical indexes of the system, including resolution, sensitivity and the like, are further greatly improved.
6) The method is convenient, simple in structure, low in cost and easy to implement.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. An optical fiber laser online monitoring system is characterized by comprising: the device comprises a fiber laser, a fiber sampler, a detection unit, a signal processing circuit and a data acquisition and processing unit;
the optical fiber laser comprises a laser generating component, a first transmission optical fiber, a second transmission optical fiber and a laser output head, wherein the laser generating component is connected with one end of the first transmission optical fiber, the laser output head is connected with one end of the second transmission optical fiber, the other end of the first transmission optical fiber is connected with the other end of the second transmission optical fiber to form a fusion joint, a first transmission optical fiber section, a second transmission optical fiber section and the fusion joint form a fusion-spliced transmission optical fiber, the first transmission optical fiber section is an optical fiber section which is on the first transmission optical fiber and is a first preset distance away from the fusion joint, and the second transmission optical fiber section is an optical fiber section which is on the second transmission optical fiber and is a second preset distance away from the fusion joint;
the optical fiber sampler comprises at least one coupling optical fiber, the coupling optical fiber is attached to the fusion welding transmission optical fiber in parallel, or the coupling optical fiber is wound on the fusion welding transmission optical fiber to form a sampling optical fiber, the length of the sampling optical fiber is 5-25cm, the number of winding turns is 1-15, the optical fiber sampler is used for extracting scattering optical fiber laser, and the scattering optical fiber laser is optical fiber laser scattered at the fusion welding point;
the detection unit is connected with the coupling optical fiber in the optical fiber sampler and is used for receiving the scattering optical fiber laser and detecting the parameters of the scattering optical fiber laser;
the signal processing circuit is electrically connected with the detection unit and is used for receiving the parameters of the scattering fiber laser and amplifying the parameters of the scattering fiber laser;
the data acquisition processing unit is electrically connected with the signal processing circuit and is used for acquiring the amplified parameters of the scattering fiber laser and processing the amplified parameters of the scattering fiber laser;
the exterior of the first transmission optical fiber except for the first transmission optical fiber segment has a coating layer, and the exterior of the second transmission optical fiber except for the second transmission optical fiber segment has a coating layer;
the outside of the coupling fiber except the fiber attached in parallel with the fusion splicing transmission fiber or wound on the fusion splicing transmission fiber is provided with a coating layer.
2. The fiber laser on-line monitoring system of claim 1, wherein the first transmission fiber and the second transmission fiber are the same type of fiber.
3. The fiber laser on-line monitoring system of claim 2, wherein the first transmission fiber, the second transmission fiber and the coupling fiber are double-clad fibers each comprising an inner cladding and an outer cladding, and the diameter of the inner cladding of the coupling fiber is smaller than the diameter of the inner cladding of the first transmission fiber and the diameter of the inner cladding of the second transmission fiber.
4. The fiber laser on-line monitoring system according to claim 3, wherein the sampling fiber is coated with UV-curable glue on its exterior.
5. The fiber laser on-line monitoring system according to claim 4, wherein the refractive index of the inner cladding of the coupling fiber is greater than or equal to the refractive index of the inner cladding of the first transmission fiber and the refractive index of the inner cladding of the second transmission fiber, and the refractive index of the ultraviolet curing glue is less than the refractive index of the inner cladding of the first transmission fiber and the refractive index of the inner cladding of the second transmission fiber.
6. The fiber laser on-line monitoring system according to claim 1, wherein the detection unit comprises one or more of a forward laser power meter, a forward photodetector, a spectrometer, a backward laser power meter and a backward photodetector.
7. The fiber laser on-line monitoring system according to claim 1, further comprising a second detection unit, wherein the second detection unit is disposed on an optical path of the fiber laser output by the laser output head, and the second detection unit is configured to obtain a parameter of the fiber laser emitted by the fiber laser and send the parameter of the fiber laser to the signal processing circuit.
8. The fiber laser on-line monitoring system according to claim 7, wherein the second detection unit comprises one or more of a laser power meter, a photodetector and a spectrometer.
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| US8520986B2 (en) * | 2010-04-05 | 2013-08-27 | George Franklin Dailey | Use of fiber optic sensor techniques for monitoring and diagnostics of large AC generators |
| CN103162822A (en) * | 2013-02-28 | 2013-06-19 | 中国人民解放军国防科学技术大学 | Online monitoring system of optical fiber laser output power based on integrating sphere |
| CN204495462U (en) * | 2015-01-08 | 2015-07-22 | 中国工程物理研究院应用电子学研究所 | The online power monitoring apparatus of a kind of high-power all-fiber laser |
| CN205785514U (en) * | 2016-06-22 | 2016-12-07 | 中国科学院西安光学精密机械研究所 | A kind of all-fiber power measuring system for high-capacity optical fiber laser |
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2018
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