CN113567090A - Automatic testing device and method for high-power grating performance of optical fiber laser - Google Patents
Automatic testing device and method for high-power grating performance of optical fiber laser Download PDFInfo
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- CN113567090A CN113567090A CN202111116212.2A CN202111116212A CN113567090A CN 113567090 A CN113567090 A CN 113567090A CN 202111116212 A CN202111116212 A CN 202111116212A CN 113567090 A CN113567090 A CN 113567090A
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Abstract
The invention relates to the technical field of grating performance test, and discloses a high-power grating performance automatic test device and a method for an optical fiber laser, wherein the high-power grating performance automatic test device comprises the following steps: the device comprises a cabinet, an optical module, a temperature rise coefficient testing module, a plurality of groups of pumping sources, a thermal infrared imager, a power meter and an industrial personal computer. The invention has the following advantages and effects: according to the high-power grating performance automatic testing device and method for the fiber laser, due to the fact that the optical module and the temperature rise coefficient testing module are arranged, fiber grating efficiency, cladding light testing or temperature rise coefficient testing can be automatically conducted. Simultaneously, the experimenter only needs to connect corresponding test light path according to the demand in this application to send corresponding instruction to the industrial computer, automatic testing arrangement can accomplish test work, has avoided the reading error that personal experience caused in the manual test reading, has also reduced the requirement of tester skill level, and then reduces test cost, makes the tester need not to face optic fibre, has guaranteed tester's security.
Description
Technical Field
The application relates to the technical field of grating performance testing, in particular to a high-power grating performance automatic testing device and method for an optical fiber laser.
Background
At present, the optical fiber laser has the advantages of good beam quality, compact structure, small volume, light weight, easy heat dissipation, good working stability and the like, and becomes a research hotspot of all countries in the world. The double-clad doped fiber adopted by the existing high-power fiber laser and fiber amplifier has higher and higher power along with the continuous popularization of the domestic fiber laser. From hundreds of watts to tens of thousands of watts. Has been widely applied to the fields of science and technology, military, medical treatment, industrial processing and the like. In the manufacturing industry, the light source is used as a high-intensity light source for cutting, punching, welding and the like. The power of the fiber lasers can not be increased without opening the high-power grating, and the fiber lasers and the ytterbium-doped fiber form a resonant cavity, so that an all-fiber laser system is realized.
These high power gratings include, in addition to the need to test some basic fiber parameters: transmission spectrum, reflection spectrum, insertion loss. The above-mentioned indicators were tested with specialized instrumentation at milliwatt power. In order to improve the product performance, some application function indexes including 1080nm efficiency, optical fiber temperature, temperature rise coefficient and the like under 2000W high power need to be tested. The existing high-power grating performance testing device is simple and crude, has low safety factor and does not have the existing high-power grating testing equipment. Multiple persons are required to cooperate together. And (3) reading the laser power index parameters visually, carrying out temperature test by holding the thermal infrared imager, and solving the problems that the read data has errors, a test report is manually filled in, the record is inaccurate, and the like. There is a need to solve these problems that plague the end of use.
Disclosure of Invention
Aiming at the defects in the prior art, the device and the method for automatically testing the performance of the high-power grating for the fiber laser are provided, so that the detection of a single operator can be realized, and the skill level of a tester can be greatly reduced.
In order to achieve the above purposes, on one hand, the technical scheme is as follows:
the application provides an automatic testing arrangement of high power grating performance for fiber laser, includes:
the equipment cabinet is internally divided into an upper part and a lower part;
an optical module including a double-clad active fiber disposed at an upper portion of an interior of the cabinet;
the temperature rise coefficient testing module is inserted in the lower part of the cabinet and comprises a thermometer for measuring room temperature;
the pumping sources are partially arranged on the temperature rise coefficient testing module and used for supplying light to the temperature rise coefficient testing module, and the rest pumping sources are arranged on the upper part of the cabinet and used for supplying light to the optical module; at least four groups of emergent light wavelengths of 980nm, 976nm and 915nm exist in the multiple groups of pumping sources;
the thermal infrared imager is arranged on the upper part of the cabinet;
the power meter is arranged outside the cabinet, is connected with the light-emitting optical fiber of the test light path and is used for measuring the light-emitting power of the test light path;
and the industrial personal computer is arranged at the lower part of the cabinet and is used for controlling the optical module, the temperature rise coefficient testing module and the thermal infrared imager to test the grating to be tested and calculating and outputting a result.
Preferably, the automatic testing device further comprises a two-dimensional moving platform, the thermal infrared imager is arranged at the upper part of the cabinet through the two-dimensional moving platform, and the thermal infrared imager scans in the upper part of the cabinet according to a preset path through the two-dimensional moving platform;
the thermal infrared imager is also used for transmitting the detected temperature to the industrial personal computer.
Preferably, the automatic test apparatus further includes:
and one or more audio acquisition and analysis units are arranged on the upper part of the cabinet and used for acquiring the sound in the cabinet and transmitting the acquired sound signals to the industrial personal computer.
Preferably, the automatic test device further comprises a power collection box, the power collection box comprising:
the side wall of the outer cover is provided with a turnover cover, and the power meter is arranged on the inner wall of the outer cover and aligned to the turnover cover;
the optical flat plate is arranged at the bottom of the outer cover;
a lifting platform which is arranged in the outer cover and is arranged on the optical flat plate;
the fixed sleeve is arranged on the lifting platform, one end of the fixed sleeve is connected to the power meter after the lifting platform is completely lifted, and the other end of the fixed sleeve is aligned to the turnover cover;
the grating to be measured is connected with the fixed sleeve through the light-emitting optical fiber of the light path.
The application also provides an automatic test method of the high-power grating performance automatic test device for the fiber laser, which comprises the following steps:
the grating to be tested is connected to the optical module or the temperature rise coefficient test module as required, and the optical fiber of the light path is connected to the power meter;
selecting fiber grating efficiency, cladding light test or temperature rise coefficient test by an industrial personal computer, connecting corresponding light paths, and calculating and outputting test results according to data of a power meter and a thermal infrared imager;
the fiber grating efficiency is obtained by adopting an optical module and a power meter;
the cladding light test is obtained by adopting an optical module and a power meter;
the temperature rise coefficient test is obtained through a temperature rise coefficient test module, a power meter and a thermal infrared imager.
Preferably, when the industrial personal computer selects the fiber grating efficiency, the method comprises the following steps:
s11, respectively connecting two ends of a double-clad active optical fiber to a pair of gratings to be tested, connecting the other end of each grating to be tested to a group of pumping sources through a coupler, and connecting the coupler close to one side of a low-reflection grating in the grating to be tested to a power meter;
s12, setting a group of increasing test currents, activating the pumping sources according to the test currents in sequence, summing the powers of the two groups of pumping sources to obtain pumping power, and measuring the laser power through a power meter;
and S13, obtaining the efficiency value of the fiber grating according to the laser power and the pumping power.
Preferably, when the industrial personal computer selects the fiber grating efficiency, the step S12 further includes the following steps:
s121, after selecting stable light supply of the test current for at least 3min each time, measuring the temperatures of input and output optical fibers of the grating to be tested and the coupler and the temperatures of the grating to be tested and the coupler by using a thermal infrared imager;
s122, after a group of test current values are tested, gradually increasing current to full power of a pumping source, and measuring the temperature of input and output optical fibers of the grating to be tested through a thermal infrared imager in the process;
and S123, measuring the temperature of the grating to be measured and each welding point by the thermal infrared imager after the pumping source is at full power and stably emits light for at least 3 min.
Preferably, when the industrial personal computer selects the cladding light test, the method comprises the following steps:
s21, two sides of the double-clad active optical fiber are respectively connected with a pair of gratings to be tested, a high reflecting grating in the gratings to be tested is connected with a group of pumping sources through a coupler, and a low reflecting grating in the gratings to be tested is connected to a power meter;
s22, providing a set current for a pumping source according to needs, and measuring the optical power by a power meter;
s23, a mode stripper is connected between the low-reflection grating and a power meter, and the power meter measures optical power;
and S24, calculating the light power of the cladding according to the light power measured in the steps S22 and S23.
Preferably, when the industrial computer selects the temperature rise coefficient test, the method comprises the following steps:
s31, connecting the grating to be measured into a group of pumping sources through a coupler, and connecting the other end of the grating to be measured to a power meter;
s32, measuring the room temperature, setting a group of gradually increased test currents, sequentially supplying power to a pumping source according to the test currents, and respectively recording the measured values of the power meter and the thermal infrared imager under each test current;
and S33, calculating a difference value between the measured value of the thermal infrared imager and the room temperature to obtain a temperature rise amount, and obtaining a temperature rise coefficient according to the temperature rise amount and the corresponding output power.
Preferably, the automatic testing device further comprises an audio acquisition and analysis unit, and the automatic testing method further comprises the following steps:
when the automatic testing method is carried out, the audio acquisition and analysis unit acquires and analyzes sound signals, when firecracker sound occurs, a signal alarm is sent to the industrial personal computer, and the industrial personal computer controls the optical module and the temperature rise coefficient testing module to stop working after receiving the signal.
The beneficial effect that technical scheme that this application provided brought includes:
the high-power grating performance automatic testing device for the fiber laser is provided with the optical module and the temperature rise coefficient testing module, so that the fiber grating efficiency, the cladding light test or the temperature rise coefficient test can be automatically carried out.
According to the automatic high-power grating performance testing method for the optical fiber laser, in the testing process, experimenters only need to connect corresponding testing light paths according to requirements, and send corresponding instructions to an industrial personal computer, the automatic testing device can complete testing work, reading errors caused by personal experience in manual testing reading are avoided, the requirement of the skill level of the testers is also reduced, the testing cost is further reduced, the testers do not need to face optical fibers, and the safety of the testers is guaranteed.
On the other hand, the integration level of this application is high, test data all is that each part is collected in the industrial control computer after gathering, and need manual input unlike the method that adopts artifical reading among the prior art, the work burden of testing personnel has been alleviateed, conveniently handle experimental result data ization, on the one hand can in time accurately form the report, realize test data automatic recording and save, condition retrieval function has, conveniently carry out quality analysis and trace back, on the other hand conveniently saves and prints, digital testing result simultaneously, can also form the database with data summarization, be convenient for guide subsequent improvement.
In a further improvement of the application, the thermal infrared imager moves through the two-dimensional moving platform, and can scan according to a preset path, such as a rectangular path or an O-shaped path, so that the thermal infrared imager can scan as comprehensively as possible, and the accuracy of data acquisition is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an automatic test apparatus according to the present application.
Fig. 2 is an optical path diagram of the fiber grating efficiency test in the present application.
Fig. 3 is a diagram of the optical path of the cladding light test in the present application.
Fig. 4 is a light path diagram of temperature rise coefficient test in the present application.
Reference numerals: 1. a cabinet; 2. an optical module; 3. a temperature rise coefficient test module; 4. a thermal infrared imager; 5. a power meter; 6. an industrial personal computer; 7. a two-dimensional moving platform; 8. an audio acquisition and analysis unit; 9. a housing; 10. an optical flat plate; 11. a lifting platform; 12. and fixing the sleeve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the present application, an embodiment of an automatic testing apparatus for high power grating performance of an optical fiber laser is provided, as shown in fig. 1, including a cabinet 1, an optical module 2, a temperature rise coefficient testing module 3, a thermal infrared imager 4, a power meter 5, and an industrial personal computer 6.
Above-mentioned rack 1 is inside to be divided into two parts from top to bottom, the upper portion is used for detecting the grating that awaits measuring, each item passive device in above-mentioned optical module 2 all need set up at rack 1 upper portion according to fig. 2, the light path that fig. 3 and fig. 4 show, in some preferred embodiments, be provided with some anchor clamps in rack 1 inside upper portion, can help the optic fibre of the interior connection usefulness of centre gripping light path on the one hand, it is stable to maintain the light path, on the other hand can the centre gripping light-emitting optical fiber, so that the relative position between fixed light-emitting optical fiber and the power meter 5, can stabilize the light-emitting and reduce undulant, avoid equipment to drag simultaneously and lead to unexpected damage.
The lower part of the cabinet 1 is provided with a series of slots, the temperature rise coefficient testing module 3 and the industrial personal computer 6 are designed into pluggable shapes and are plugged in the slots, and some embodiments are plugged with accessory devices such as a cabinet 1 cooling device and a fusion device for fusion splicing optical fibers, so that the corresponding modules can be directly replaced when the cabinet is damaged for maintenance or updated, and the shutdown time is reduced. Preferably, the industrial personal computer 6 is divided into a plurality of functional modules according to its functions, such as an electrical module for controlling power supply and emergency stop, a main control module for giving instructions to other devices to perform a control function, and an industrial personal computer for data storage, processing and analysis. All the functional modules are detachably inserted in the slots and connected through data lines. Preferably, a certain space is reserved inside the slot of the cabinet 1, so that the data line can be conveniently placed and connected. In some preferred embodiments, the industrial personal computer may interface with an MES System (Manufacturing Execution System, which is generally used to store production information of a product), and upload test data to the MES System for storage, thereby implementing information management.
As shown in fig. 1, in a general embodiment, casters and foot pads are further disposed at four corners of the cabinet 1, the foot pads can be extended and retracted to adjust the stability of the cabinet 1, and the casters facilitate the movement of the cabinet 1.
The optical module 2 and the temperature rise coefficient test module 3 are both components for testing parameters of the grating to be tested, the optical module 2 comprises a double-cladding active optical fiber, preferably, a high-reflection grating and a low-reflection grating which are used as standard components for comparison reference, and a part of pump sources are arranged in the optical module 2, emergent light of the part of pump sources is 915nm and/or 976nm generally, and the optical module is mainly used for testing efficiency of the fiber grating and testing cladding light. The temperature rise coefficient test module 3 is used for testing the temperature rise coefficient of the grating and is inserted into a slot at the lower part of the cabinet 1, a thermometer for measuring room temperature and a pumping source for providing emergent light with shorter wavelength are arranged in the temperature rise coefficient test module 3, the pumping source generally arranged in the temperature rise coefficient test module 3 is 976nm and/or 915nm, and circuits for controlling devices and transmitting data are arranged.
The thermal infrared imager 4 is arranged at the upper part of the cabinet 1 and used for detecting the temperature of the grating, the coupler and the welding points of the coupler. Preferably, the thermal infrared imager 4 is arranged at the upper part of the cabinet 1 through the two-dimensional moving platform 7, and scans in the upper part of the cabinet 1 according to a preset path through the two-dimensional moving platform 7; specifically, the two-dimensional moving platform 7 has two sets of mutually perpendicular slide rails, each pair of the slide rails is arranged in a transverse direction and a longitudinal direction, in the embodiment shown in fig. 1, the transverse slide rail is fixed at the top of an inner cavity of the upper part of the cabinet 1, the longitudinal slide rail is erected on the transverse slide rail and can slide on the transverse slide rail, the thermal infrared imager 4 slides on the longitudinal slide rail, through the cooperation of the two sets of slide rails in the transverse direction and the longitudinal direction, the thermal infrared imager 4 can move along any path on the horizontal plane, the path scanning of the square or O-shaped path is preset under a general condition, and when a user needs the two-dimensional moving platform 7, the user can input a corresponding instruction to scan paths in other shapes.
The power meter 5 is arranged outside the cabinet 1 and used for connecting a light-emitting optical fiber of a test light path, reducing the influence of heat generated by the power meter 5 on temperature rise coefficient measurement and measuring the light power of the emission. Preferably, the power meter 5 is mounted on a power collection box, which includes a housing 9, an optical flat 10, a lifting platform 11 and a fixing sleeve 12, and plays a role of protecting the power meter 5.
As shown in fig. 1, the housing 9 is surrounded on five sides and has a bottom surface which is vacant, and the optical flat plate 10 is disposed in the bottom surface vacancy of the housing 9. The cover 9 is provided with a flip cover for opening the side wall of part of the cover 9, the power meter 5 is aligned to the part with the opened side wall, specifically, the flip cover is in an L shape, the long edge of the flip cover is arranged at the top of the cover 9 and used for heat dissipation after being opened, and the short edge of the flip cover is arranged on the side wall of the cover 9 and used for connecting an optical fiber after being opened.
Above-mentioned lift platform 11 sets up on optical flat plate 10, and above-mentioned fixed sleeve 12 sets up on lift platform 11, and when lift platform 11 rose completely, fixed sleeve 12 one end just connect in power meter 5, and the light-emitting optical fiber of test light path is connected on fixed sleeve 12 in stretching into dustcoat 9 through the lateral wall on dustcoat 9 open the part, and then is connected with power meter 5 for light-emitting optical fiber can aim at power meter 5 and avoid measuring error.
More preferably, the light-emitting optical fiber is a QBH output optical cable, and the fixing sleeve 12 is a QBH fixing sleeve 12, so that optical fiber connection and accessory replacement are facilitated.
In some embodiments, a cantilever computer is further arranged on the side wall of the cabinet 1, so that the industrial personal computer 6 can be conveniently controlled by the tester on the one hand, and the data collected by the industrial personal computer 6 can be displayed on the other hand for the tester to analyze and judge.
On the other hand, in order to observe real-time test conditions, the upper portion of the cabinet 1 is provided with the camera, the camera can transmit observed images to the cantilever computer, so that testers can observe specific conditions of the cabinet 1, and the camera can receive control of the cantilever computer to shoot images at different angles.
The cantilever computer is generally hinged to the side face of the cabinet 1, and the display of the cantilever computer can also be rotatably arranged, so that the cantilever computer can be placed close to the cabinet 1 when not in use, and the occupied volume of equipment can be reduced; when the device is used, corresponding adjustment can be carried out according to different positions of a user.
The application also provides an embodiment of the method for automatically testing the performance of the high-power grating for the optical fiber laser based on the automatic testing device, which comprises the following steps:
the grating to be tested is connected into the optical module 2 or the temperature rise coefficient test module 3 according to the requirement, and the optical fiber of the light path is connected to the power meter 5; specifically, need fix dynamometer 5 at the assigned position earlier to be connected to dynamometer 5 and fixed with light-emitting fiber, preferred, light-emitting fiber adopts QBH output optical cable, and dynamometer 5 carries on in the power acquisition box, protects QBH fixed sleeve 12 in the power acquisition box, only needs to dock QBH output optical cable and QBH fixed sleeve 12 this moment, can accomplish light-emitting fiber's fixed.
Selecting fiber grating efficiency, cladding light test or temperature rise coefficient test by the industrial personal computer 6, connecting corresponding light paths, and calculating and outputting test results according to data of the power meter 5 and the thermal infrared imager 4; specifically, according to the desired test, the optical paths shown in fig. 2, fig. 3, or fig. 4 are connected, and in some embodiments of the automatic testing apparatus, optical fiber reels are provided, and in corresponding embodiments of the automatic testing method, optical fibers that easily interfere with each other in the test optical path may be wound on different optical fiber reels in this step; on the other hand, before the industrial personal computer 6 is used, the cabinet 1 needs to be supplied with power, preferably AC380V power, while the data lines are connected.
The fiber grating efficiency is obtained by using an optical module 2 and a power meter 5.
The cladding light test is obtained using an optical module 2 and a power meter 5.
The temperature rise coefficient test is obtained through the temperature rise coefficient test module 3, the power meter 5 and the thermal infrared imager 4.
In some embodiments, for convenience of confidentiality and management, login software is set in the industrial personal computer 6, and a tester needs to input a corresponding account number and a corresponding password to enable the equipment. Meanwhile, some embodiments are provided with administrators, so that all the operators can be managed conveniently.
In some further embodiments of the automatic test equipment, a cooling system is provided to cool the cabinet, which in general embodiments is water cooled, and in some embodiments may also be air cooled.
Correspondingly, in the embodiment of the corresponding automatic test method, before the industrial personal computer 6 is used, the cooling system of the cabinet 1 needs to be started, when water cooling is used, a circulating water pipeline of the cabinet body of the cabinet 1 needs to be established, a circulating water inlet and outlet pipe is connected, the water inlet and outlet direction is noticed, water needs to pass through a flowmeter, the flowmeter is provided with a water inlet direction mark, then the cooling water circulator is started, and the existence of water leakage is checked.
Meanwhile, the inventor finds that the optical fiber generally emits firecracker sound when an accident occurs, and generally can play a certain warning role, but manual detection is generally adopted in the prior art, and the time is insufficient to avoid danger.
In order to ensure safety, in some preferred embodiments of the automatic test equipment, an audio acquisition and analysis unit 8 is further provided, and the audio acquisition and analysis unit 8 acquires and analyzes sounds in the test process.
Correspondingly, in the embodiment of the corresponding automatic testing method, the audio acquisition and analysis unit 8 acquires, analyzes and analyzes the sound in the testing process and can send out firecracker sound when the optical fiber is burnt, and immediately sends out an alarm to the industrial personal computer 6 after the audio acquisition and analysis unit 8 acquires a specific firecracker sound signal, so that the industrial personal computer 6 immediately and automatically turns off the automatic testing equipment, preferentially turns off the pumping source and protects the testing system and personnel safety.
As shown in fig. 2, in this embodiment, the fiber bragg grating efficiency is detected, it should be noted that the high-reflection grating and the low-reflection grating in fig. 2, 3 and 4 are also detected as the grating to be detected, and preferably, in some embodiments, the grating used as the standard is used to replace the high-reflection grating and the low-reflection grating in the drawing, and the obtained experimental result is compared with the grating to be detected.
In this embodiment, a pair of gratings to be tested is required to be tested simultaneously, which includes:
s11, respectively connecting two ends of a double-clad active optical fiber to a pair of gratings to be tested, connecting the other end of each grating to be tested to a group of pumping sources through a coupler, and connecting the coupler close to one side of a low-reflection grating in the grating to be tested to a power meter 5;
specifically, as shown in fig. 2, a high reflective grating and a low reflective grating serving as gratings to be measured are respectively connected to two ends of a double-clad active fiber, the high reflective grating is connected to a set of pump sources through a forward (N + 1) × 1 coupler, the low reflective grating is connected to a set of pump sources through a reverse (N + 1) × 1 coupler, and light is emitted from the reverse (N + 1) × 1 coupler to a power meter 5.
S12, setting a group of increasing test currents, activating the pumping sources according to the test currents in sequence, summing the powers of the two groups of pumping sources to obtain pumping power, and measuring the laser power through a power meter 5;
specifically, four sets of test currents, 3A, 7A, 11A and 15A, are set in the present embodiment, and in other embodiments, a set of test currents with other numbers and increasing by other rules, such as 5A, 7A, 11A and 15A, may also be set, and the wavelengths generated by the selected pump sources are 915nm and 976nm, and in other embodiments, may also be 1064 nm;
when measuring the power of the pump source, a measuring method is preferably adopted, namely, when the optical path is connected, a cut-off is reserved between each grating to be measured and the corresponding coupler, each cut-off part leads light to the power meter 5 through the light-emitting optical fiber, the light powers of the two cut-off parts are measured and summed to obtain the pump power, the cut-off parts are welded when measuring the laser power, the reverse (N + 1) × 1 coupler is connected to the light-emitting optical fiber, and the light-emitting power measured by the light-emitting to the power meter 5 is the laser power. Since the pump will have loss deviation after long-term operation, the measurement method has the advantage that the result is more accurate.
The sum of the powers of the two groups of pumping sources under the current test current can be obtained through calculation according to information recorded by the nameplates of the pumping sources by adopting a calculation method, namely the pumping power.
In this embodiment, a measurement method is used to select a test current
Supplying power to the pump source, and measuring the real-time optical power of light emitted from between the forward (N + 1) × 1 coupler and the high reflecting grating
Measuring the real-time optical power of light emerging from between the low-reflectivity grating and the reverse (N + 1) × 1 coupler
(ii) a Selecting a test current
For supplying power to the pump source, measuring the coupler from the forward direction (N + 1) × 1And real-time optical power of light emitted between high reflecting grating
Measuring the real-time optical power of light emerging from between the low-reflectivity grating and the reverse (N + 1) × 1 coupler
(ii) a By analogy, select
Measuring the real-time optical power of the corresponding position
And
and adding the two real-time optical powers corresponding to each current value according to the table 1 to obtain the corresponding pumping power.
And then the cut-off part is welded according to the light path shown in fig. 2, the reverse (N + 1) × 1 coupler is connected to the light-emitting optical fiber, and the light-emitting power is measured by the light-emitting power meter 5 as laser power.
And S13, obtaining the efficiency value of the fiber grating according to the calculation efficiency in the table 1, preferably, outputting the calculated efficiency value of the fiber grating through the industrial personal computer 6, and further generating a corresponding detection report in some more preferred embodiments.
In this embodiment, the fiber grating efficiency
The calculation formula of (a) is as follows:
in other embodiments, the calculation formula may be analogized as well:
where n is the number of test currents,
the laser power value corresponding to the nth test current value,
and the pumping power value corresponding to the nth test current value.
As a more preferable scheme, the embodiment for performing the fiber grating efficiency detection further includes:
s121, after selecting stable light supply of the test current for at least 3min each time, measuring the temperature of input and output optical fibers of the grating to be tested and the coupler and the temperature of the grating to be tested and the coupler through the thermal infrared imager 4;
s122, after a group of test current values are tested, gradually increasing current to full power of a pumping source, and measuring the temperature of input and output optical fibers of the grating to be tested through the thermal infrared imager 4 in the process;
and S123, measuring the temperature of the grating to be measured and each welding point through the thermal infrared imager 4 after the pumping source is at full power and stably emits light for at least 3 min.
Preferably, the temperature measured in the above step and the time of measurement are recorded, and a detection report is generated by the industrial personal computer 6 together with the fiber grating efficiency value.
As shown in fig. 3, the present embodiment performs a cladding light test, including:
s21, two sides of the double-clad active optical fiber are respectively connected with a pair of gratings to be tested, a high reflecting grating in the gratings to be tested is connected with a group of pumping sources through a coupler, and a low reflecting grating in the gratings to be tested is connected to a power meter 5;
s22, providing set current for a pumping source according to needs, and measuring the optical power P by a power meter 51(ii) a Specifically, 15A is provided in the present embodimentThe wavelength of the pump source is 915nm or 976nm, and in other embodiments, 1064nm is also possible.
S23, a mode stripper is connected between the low-reflection grating and the power meter 5, and the power meter 5 measures the optical power P2；
S24, calculating according to the optical power measured in the steps S22 and S23 and 5 to obtain cladding optical power, wherein the calculation formula is cladding optical power PBag (bag)= P1- P2。
As shown in fig. 4, the temperature rise coefficient test performed in this embodiment includes:
s31, connecting the grating to be measured into a group of pumping sources through a coupler, and connecting the other end of the grating to be measured to a power meter 5; specifically, a group of pump sources is connected to the grating to be measured through a forward (N + 1) × 1 coupler, and the other end of the grating to be measured is connected to the power meter 5.
S32, measuring the room temperature, setting a group of gradually increased test currents, sequentially supplying power to a pumping source according to the test currents, and respectively recording the measured values of the power meter 5 and the thermal infrared imager 4 under each test current; specifically, in this embodiment, the test currents 3A, 7A, 11A, and 15A are set, the wavelength of the laser provided by the pump source is 976nm or 915nm, and the output power at each test current and the corresponding measured value of the thermal infrared imager 4, that is, the temperature of the grating, are measured respectively.
S33, calculating a difference value between the measured value of the thermal infrared imager 4 and the room temperature to be a temperature rise amount, and obtaining a temperature rise coefficient according to the temperature rise amount and the corresponding output power; specifically, a difference value is obtained between the measured value of each thermal infrared imager 4 and the measured room temperature to obtain a temperature rise, a corresponding relation between the temperature rise and the output power under the same test current is recorded, then a coordinate system is established by taking the temperature rise as a vertical coordinate and the output power as a horizontal coordinate, the data are plotted on the coordinate system, and then a linear function is fitted, and the slope of the linear function obtained by fitting is the temperature rise coefficient.
Preferably, the temperature rise coefficient is also output through the industrial personal computer 6, and in some more preferred embodiments, a detection report is also formed through the industrial personal computer 6.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention.
Claims (10)
1. Automatic testing arrangement of high power grating performance for fiber laser, its characterized in that includes:
the equipment cabinet (1) is internally divided into an upper part and a lower part;
an optical module (2) comprising a double-clad active optical fiber arranged at an upper portion of the interior of the cabinet (1);
the temperature rise coefficient testing module (3) is inserted in the lower part of the cabinet (1) and comprises a thermometer for measuring room temperature;
a plurality of groups of pumping sources, wherein part of the pumping sources are arranged on the temperature rise coefficient testing module (3) and used for supplying light to the temperature rise coefficient testing module (3), and the rest pumping sources are arranged on the upper part of the cabinet (1) and used for supplying light to the optical module (2); at least four groups of emergent light with the wavelengths of 1080nm, 1064nm, 980nm and 915nm exist in the multiple groups of pumping sources;
the thermal infrared imager (4) is arranged at the upper part of the cabinet (1);
the power meter (5) is arranged outside the cabinet (1), is connected with the light-emitting optical fiber of the test light path, and is used for measuring the light-emitting power of the test light path;
and the industrial personal computer (6) is arranged on the lower part of the cabinet (1) and is used for controlling the optical module (2), the temperature rise coefficient testing module (3) and the thermal infrared imager (4) to test the grating to be tested and also used for calculating and outputting a result.
2. The automatic testing device for the performance of the high-power grating for the fiber laser according to claim 1, characterized in that: the automatic testing device also comprises a two-dimensional moving platform (7), the thermal infrared imager (4) is arranged at the upper part of the cabinet (1) through the two-dimensional moving platform (7), and the two-dimensional moving platform (7) is used for scanning in the upper part of the cabinet (1) according to a preset path;
the thermal infrared imager (4) is also used for transmitting the detected temperature to the industrial personal computer (6).
3. The automatic testing device for high power grating performance of fiber laser according to claim 1, further comprising:
the audio acquisition and analysis unit (8) is provided with one or more than one, is arranged on the upper part of the cabinet (1) and is used for acquiring sound in the cabinet (1) and transmitting acquired sound signals to the industrial personal computer (6).
4. The automatic high-power grating performance testing device for fiber lasers according to claim 1, further comprising a power collection box, said power collection box comprising:
the side wall of the outer cover (9) is provided with a turnover cover, and the power meter (5) is arranged on the inner wall of the outer cover (9) and aligned to the turnover cover;
an optical flat plate (10) arranged at the bottom of the housing (9);
a lifting platform (11) which is arranged in the outer cover (9) and is installed on the optical flat plate (10);
the fixed sleeve (12) is arranged on the lifting platform (11), when the lifting platform (11) is completely lifted, one end of the fixed sleeve (12) is connected to the power meter (5), and the other end of the fixed sleeve is aligned to the turnover cover;
the grating to be measured is connected with the fixed sleeve (12) through the light-emitting optical fiber of the light path.
5. An automatic test method based on the automatic test device for high-power grating performance of the fiber laser in claim 1, characterized by comprising the following steps:
the grating to be tested is connected into the optical module (2) or the temperature rise coefficient test module (3) according to the requirement, and the optical fiber of the light path is connected to the power meter (5);
selecting fiber grating efficiency, cladding light test or temperature rise coefficient test through an industrial personal computer (6), connecting corresponding light paths, and calculating and outputting test results according to data of a power meter (5) and a thermal infrared imager (4);
the fiber bragg grating efficiency is obtained by adopting an optical module (2) and a power meter (5);
the cladding light test is obtained by adopting an optical module (2) and a power meter (5);
the temperature rise coefficient test is obtained through a temperature rise coefficient test module (3), a power meter (5) and a thermal infrared imager (4).
6. The method for automatically testing the performance of the high-power grating for the fiber laser according to claim 5, wherein when the industrial personal computer (6) selects the efficiency of the fiber grating, the method comprises the following steps:
s11, two ends of a double-clad active optical fiber are respectively connected to a pair of gratings to be tested, the other end of each grating to be tested is connected with a group of pumping sources through a coupler, and the coupler close to one side of the low-reflection grating in the grating to be tested is connected to a power meter (5);
s12, setting a group of increasing test currents, activating the pumping sources according to the test currents in sequence, summing the power of the two groups of pumping sources to obtain pumping power, and measuring the laser power through a power meter (5);
and S13, obtaining the efficiency value of the fiber grating according to the laser power and the pumping power.
7. The method for automatically testing the performance of the high-power grating for the fiber laser according to claim 6, wherein when the industrial personal computer (6) selects the efficiency of the fiber grating, the step S12 further comprises the following steps:
s121, after selecting stable light supply of the test current for at least 3min each time, measuring the temperatures of input and output optical fibers of the grating to be tested and the coupler and the temperatures of the grating to be tested and the coupler through a thermal infrared imager (4);
s122, after a group of test current values are tested, gradually increasing current to full power of a pumping source, and measuring the temperature of input and output optical fibers of the grating to be tested through a thermal infrared imager (4) in the process;
and S123, measuring the temperature of the grating to be measured and each welding point through the thermal infrared imager (4) after the pumping source is at full power and stably emits light for at least 3 min.
8. The method for automatically testing the performance of the high-power grating for the fiber laser according to claim 5, wherein when the industrial personal computer (6) selects the cladding light test, the method comprises the following steps:
s21, two sides of the double-clad active optical fiber are respectively connected with a pair of gratings to be tested, a high reflecting grating in the gratings to be tested is connected with a group of pumping sources through a coupler, and a low reflecting grating in the gratings to be tested is connected to a power meter (5);
s22, providing set current for a pumping source according to needs, and measuring optical power by a power meter (5);
s23, a mode stripper is connected between the low-reflection grating and the power meter (5), and the power meter (5) measures the optical power;
and S24, calculating the light power of the cladding according to the light power measured in the steps S22 and S23.
9. The method for automatically testing the performance of the high-power grating for the fiber laser according to claim 5, wherein when the industrial personal computer (6) selects the temperature rise coefficient test, the method comprises the following steps:
s31, connecting the grating to be measured into a group of pumping sources through a coupler, and connecting the other end of the grating to be measured to a power meter (5);
s32, measuring the room temperature, setting a group of gradually increased test currents, sequentially supplying power to a pumping source according to the test currents, and respectively recording the measured values of the power meter (5) and the thermal infrared imager (4) under each test current;
and S33, calculating a difference value between the measured value of the thermal infrared imager (4) and the room temperature to be a temperature rise amount, and obtaining a temperature rise coefficient according to the temperature rise amount and the corresponding output power.
10. The automatic test method for the performance of the high-power grating for the fiber laser according to claim 5, wherein the automatic test device further comprises an audio acquisition and analysis unit (8), and the automatic test method further comprises the following steps:
when the automatic testing method is carried out, the audio acquisition and analysis unit (8) acquires and analyzes sound signals, when firecracker sound occurs, a signal alarm is sent to the industrial personal computer (6), and the industrial personal computer (6) controls the optical module (2) and the temperature rise coefficient testing module (3) to stop working after receiving the signals.
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