CN114942122A - Fiber grating power tolerance integrated detection device and method - Google Patents
Fiber grating power tolerance integrated detection device and method Download PDFInfo
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- CN114942122A CN114942122A CN202210505737.3A CN202210505737A CN114942122A CN 114942122 A CN114942122 A CN 114942122A CN 202210505737 A CN202210505737 A CN 202210505737A CN 114942122 A CN114942122 A CN 114942122A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
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Abstract
The invention relates to the technical field of fiber grating detection, in particular to a fiber grating power tolerance integrated detection device and a method, which comprises the following steps: the device comprises a first pumping source, a second pumping source, a first coupler, a second coupler, a resonant cavity, a mold stripping device, an automatic temperature detection system, a grating group to be detected and a power meter; the first pumping source is used for providing pumping light for the resonant cavity, and the resonant cavity is used for converting the pumping light combined by the first coupler into signal light to generate signal light output; the stripping device is used for stripping the pump light which is not completely converted in the resonant cavity; the second coupler is used for combining the pump light provided by the second pump source with the signal generated by the resonant cavity and then outputting the combined beam to the grating group to be tested; the automatic temperature detection system is used for detecting the temperature of the grating to be detected, and the power meter is used for testing the light-emitting power. The invention can test the power tolerance of the fiber grating pump light and the signal light in batch on the same device, thereby improving the detection efficiency and ensuring the accuracy and the safety of the detection.
Description
Technical Field
The invention relates to the technical field of fiber grating detection, in particular to a fiber grating power tolerance integrated detection device and method.
Background
At present, the optical fiber laser has the advantages of good beam quality, compact structure, good working stability and the like, and is widely applied to military, medical treatment and industrial processing. With the increasing requirements for laser power in industrial processing applications such as cutting and welding, the power that the fiber grating needs to bear as an important component of the fiber laser resonant cavity is gradually increased.
In the production process of the high-power fiber grating, in addition to the need of using a spectrometer to test some basic optical parameters, such as center wavelength, bandwidth, reflectivity and the like, under the condition of milliwatt power, the power tolerance test of pump light and signal light is also needed to be performed for the application of the grating under the condition of high power. At present, the high-power fiber grating pump light and signal light are respectively tested by adopting different test loops, multiple optical fiber cutting and welding processes are involved in the test process, the process is more complicated, and the production efficiency is lower. The used testing device is simple and crude, a plurality of testers are needed to cooperate, the thermal infrared imager is held by hands to test the temperature of the optical fiber, and certain potential safety hazards may exist due to test errors caused by misoperation.
Therefore, the efficiency of the tolerance test of the high-power fiber grating pump light and the signal light is improved, the automation degree of the test equipment is improved, and the problem to be solved at present is solved. An integrated detection device and method for fiber bragg grating power tolerance are provided.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides an integrated detection device and method for fiber grating power tolerance, so that fiber grating pump light and signal light power tolerance tests are carried out on the same device in batches, the detection efficiency is improved, and the detection accuracy and safety are ensured.
The invention provides the following technical scheme: an integrated fiber grating power tolerance detection device, comprising: the device comprises a first pumping source, a second pumping source, a first coupler, a second coupler, a resonant cavity, a mold stripping device, an automatic temperature detection system, a grating group to be detected and a power meter;
the first pumping source is used for providing pumping light for a resonant cavity, and the resonant cavity is used for converting the pumping light combined by the first coupler into signal light and generating signal light output;
the mould stripper is used for stripping pump light which is not completely converted in the resonant cavity;
the second coupler is used for combining the pump light provided by the second pump source with the signal generated by the resonant cavity and then outputting the combined beam to the grating group to be tested;
the automatic temperature detection system is used for detecting the temperature of the grating to be detected, and the power meter is connected to the tail end of the grating to be detected and used for testing the light output power.
Preferably, the resonant cavity comprises a double-clad active fiber, a high-reflection grating and a low-reflection grating, the high-reflection grating is connected with the front end of the double-clad active fiber, the low-reflection grating is connected with the tail end of the double-clad active fiber, and the front end of the high-reflection grating is connected with the first coupler.
Preferably, the automatic temperature detection system comprises a thermal infrared imager and a two-dimensional moving platform, and the two-dimensional moving platform is used for adjusting the position of the thermal infrared imager.
Preferably, the to-be-detected grating group comprises a plurality of to-be-detected fiber gratings which are connected in sequence.
An integrated detection method for power tolerance of fiber bragg grating comprises the following steps:
s1, controlling the output power of the first group of pumping sources, combining the output power by the first coupler, entering the resonant cavity, obtaining signal light output with different power after passing through the resonant cavity, enabling the signal light to sequentially pass through the mode stripper and the grating group to be detected, emitting the signal light to the power meter through the output optical fiber, measuring the signal light power P1 borne by the grating, and testing the signal light temperature rise delta T1 corresponding to each grating by the temperature detection system;
s2, closing the first group of pumping sources, controlling the output power of the second group of pumping sources, connecting the grating group to be tested after the second group of pumping sources are combined by the second branch coupler, enabling the pumping light to sequentially pass through the grating to be tested and then to be emitted to a power meter through the output optical fiber, testing the pumping light power P2 borne by the grating, and testing the pumping light temperature rise delta T2 corresponding to each grating through the temperature detection system;
s3, calculating a temperature rise coefficient K1 of the signal light of the grating according to the measured power P1 of the signal light and the temperature rise delta T1 of the signal light, calculating a temperature rise coefficient K2 of the signal light of the grating according to the measured power P2 of the signal light and the temperature rise delta T2 of the signal light, and further obtaining the power tolerance of the grating to be measured.
The invention provides an integrated detection device and method for fiber grating power tolerance, which can improve the detection efficiency and ensure the accuracy and safety of detection by carrying out fiber grating pump light and signal light power tolerance tests on the same equipment in batch. The integration of the fiber grating pump light and the signal light detection equipment is realized; an automatic detection device for the temperature rise of the grating is provided; the fiber grating power tolerance detection device can realize synchronous test of a plurality of gratings.
Drawings
FIG. 1 is a schematic diagram of the optical path 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.
As shown in fig. 1, the present invention provides a technical solution: the application provides a fiber grating power tolerance integration detection device includes: two groups of pumping sources, two forward (N +1) × 1 couplers, a resonant cavity, a mould stripping device, an automatic temperature detection system, a grating group to be detected and a power meter; wherein, the first and the second end of the pipe are connected with each other,
two groups of pumping sources, one group is used for providing pumping light for the resonant cavity, and the other group is used for testing the tolerance of the pumping light of the grating to be tested;
two forward (N +1) × 1 couplers for pumping the optical beam;
the resonant cavity comprises a double-cladding active optical fiber, a high-reflection grating and a low-reflection grating and is used for converting the pump light into signal light and generating signal light output;
the stripping device is used for stripping the pump light which is not completely converted in the resonant cavity;
the automatic temperature detection system comprises a thermal infrared imager and a two-dimensional mobile platform and is used for detecting the temperature of the grating to be detected;
the grating group to be tested comprises a plurality of fiber gratings to be tested which are connected in sequence; and the power meter is connected to the tail end of the grating to be tested and used for testing the light-emitting power.
The invention also provides a test method based on the fiber bragg grating power tolerance integrated detection device, which comprises the following steps:
connecting the gratings to be tested in sequence to form a grating group to be tested, accessing the grating group to be tested into a test light path, and aligning the output optical fiber with a power meter;
controlling the output power of a first group of pumping sources, combining the pumping sources by a first forward (N +1) × 1 coupler, entering a resonant cavity, obtaining signal light output with different powers after passing through the resonant cavity, enabling the signal light to sequentially pass through a mode stripper and a grating group to be detected, emitting the signal light to a power meter through an output optical fiber, measuring the signal light power P1 born by the grating, and then testing the signal light temperature rise delta T1 corresponding to each grating by a temperature detection system;
closing the first pumping source, controlling the output power of the second group of pumping sources, connecting the second group of pumping sources to the grating group to be tested after the first group of pumping sources are closed by the second forward (N +1) × 1 coupler, enabling the pumping light to sequentially pass through the grating to be tested and then to be emitted to a power meter through an output optical fiber, testing the pumping light power P2 borne by the grating, and then testing the pumping light temperature rise delta T2 corresponding to each grating through a temperature detection system;
and calculating a temperature rise coefficient K1 of the signal light of the grating according to the measured power P1 and the temperature rise delta T1 of the signal light, calculating a temperature rise coefficient K2 of the signal light of the grating according to the measured power P2 and the temperature rise delta T2 of the signal light, and further obtaining the power tolerance of the grating to be measured.
In the invention, the fiber grating pump light and signal light power tolerance tests are carried out on the same equipment in batch, so that the detection efficiency is improved, and the detection accuracy and safety are ensured. The integration of the fiber grating pump light and signal light detection equipment is realized; an automatic detection device for the temperature rise of the grating is provided; the fiber grating power tolerance detection device can realize synchronous test of a plurality of gratings.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The utility model provides a fiber grating power tolerance integration detection device which characterized in that: the method comprises the following steps: the device comprises a first pumping source, a second pumping source, a first coupler, a second coupler, a resonant cavity, a mold stripping device, an automatic temperature detection system, a grating group to be detected and a power meter;
the first pumping source is used for providing pumping light for a resonant cavity, and the resonant cavity is used for converting the pumping light combined by the first coupler into signal light and generating signal light output;
the mould stripper is used for stripping pump light which is not completely converted in the resonant cavity;
the second coupler is used for combining the pump light provided by the second pump source with the signal generated by the resonant cavity and then outputting the combined beam to the grating group to be tested;
the automatic temperature detection system is used for detecting the temperature of the grating to be detected, and the power meter is connected to the tail end of the grating to be detected and used for testing the light output power.
2. The integrated fiber grating power tolerance detection device according to claim 1, wherein: the resonant cavity comprises a double-cladding active optical fiber, a high-reflection grating and a low-reflection grating, the high-reflection grating is connected with the front end of the double-cladding active optical fiber, the low-reflection grating is connected with the tail end of the double-cladding active optical fiber, and the front end of the high-reflection grating is connected with the first coupler.
3. The integrated fiber grating power tolerance detection device according to claim 1, wherein: the automatic temperature detection system comprises a thermal infrared imager and a two-dimensional moving platform, and the two-dimensional moving platform is used for adjusting the position of the thermal infrared imager.
4. The integrated fiber grating power tolerance detection device according to claim 1, wherein: the grating group to be tested comprises a plurality of fiber gratings to be tested which are connected in sequence.
5. An integrated detection method for power tolerance of fiber bragg grating is characterized in that: the method comprises the following steps:
s1, controlling the output power of the first group of pumping sources, combining the output power by the first coupler, entering the resonant cavity, obtaining signal light output with different power after passing through the resonant cavity, enabling the signal light to sequentially pass through the mode stripper and the grating group to be detected, emitting the signal light to the power meter through the output optical fiber, measuring the signal light power P1 borne by the grating, and testing the signal light temperature rise delta T1 corresponding to each grating by the temperature detection system;
s2, closing the first group of pumping sources, controlling the output power of the second group of pumping sources, connecting the grating group to be tested after the second group of pumping sources are combined by the second branch coupler, enabling the pumping light to sequentially pass through the grating to be tested and then to be emitted to a power meter through the output optical fiber, testing the pumping light power P2 borne by the grating, and testing the pumping light temperature rise delta T2 corresponding to each grating through the temperature detection system;
s3, calculating the temperature rise coefficient K1 of the grating signal light according to the measured signal light power P1 and the measured signal light temperature rise delta T1, calculating the temperature rise coefficient K2 of the grating signal light according to the measured signal light power P2 and the measured signal light temperature rise delta T2, and further obtaining the power tolerance of the grating to be measured.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118090161A (en) * | 2024-03-27 | 2024-05-28 | 中国航天三江集团有限公司 | Grating diffraction efficiency and tolerance testing device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118090161A (en) * | 2024-03-27 | 2024-05-28 | 中国航天三江集团有限公司 | Grating diffraction efficiency and tolerance testing device and method |
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