Optical fiber laser module light beam NA testing device

Abstract

The invention relates to the technical field of optical fiber testing, in particular to an optical fiber laser module light beam NA testing device which comprises a laser, a laser power meter right opposite to the laser, a shading plate connected between the laser and the laser power meter in a sliding mode and a guide rail arranged between the laser and the laser power meter. The shading plate is slidably connected into the guide rail, a cooling pipeline is arranged in the shading plate and filled with cooling liquid, a cooling fan is arranged below the shading plate, the cooling pipeline comprises a cooling pipe right facing the cooling fan and a heat absorption pipe located in the shading plate, and the cooling pipe is connected with the heat absorption pipe through a water return pipe. In the LIV measuring system of the optical fiber module, the shading plate is additionally arranged, the original LIV testing device and layout are not changed and are integrated into the LIV measuring system, the cost is reduced, the space is reduced, and the testing function is improved. And optical fiber emergent light measurement of various specifications and sizes at present can be compatible. The algorithm used by the method is simple trigonometric function calculation.

Description

Technical Field

[0001] The present application relates to the technical field of optical fiber testing, and in particular to an optical fiber laser module beam NA testing device. Background Art

[0002] The common measuring device for measuring the NA of the optical fiber module is the spot measuring device, which is built according to the CCD measurement method (GB / T 15175-2012) and needs to be equipped with an optical lens, a CCD camera, and an imaging screen. The device needs to integrate an optical system, a visual imaging algorithm, etc.

[0003] The cost of hardware development and software algorithms is high. A large space is required to build the optical path, and the test function is single. The size of the beam and the energy of the beam need to be considered to select the appropriate hardware. The CCD measurement method cannot detect the absolute energy of the beam, and it is difficult to screen out products that do not meet the energy requirements. Summary of the invention

[0004] In order to facilitate the screening of beam energy, the present application provides a fiber laser module beam NA testing device.

[0005] The fiber laser module beam NA test device provided in this application adopts the following technical solution: A fiber laser module beam NA test device comprises a laser and a laser power meter facing the laser, and a shading plate slidably connected between the laser and the laser power meter, wherein the sliding direction of the shading plate is perpendicular to the light emission direction of the laser, and further comprises a guide rail arranged between the laser and the laser power meter, wherein the shading plate is slidably connected in the guide rail, wherein a cooling pipe is arranged in the shading plate, wherein the cooling pipe is filled with a coolant, wherein a cooling fan is arranged below the shading plate, wherein the cooling pipe comprises a cooling pipe facing the cooling fan and a heat absorbing pipe located inside the shading plate, wherein the cooling pipe and the heat absorbing pipe are connected via a return water pipe.

[0006] By adopting the above technical solution, a shading plate is added to the LIV measurement system of the optical fiber module, and the original LIV test device and layout are not changed and integrated into it, which reduces the cost, reduces the space, and improves the test function. It is also compatible with the current optical fiber light output measurement of various specifications and sizes. The algorithm used is a simple trigonometric function calculation. We can directly obtain the absolute energy of the optical fiber light output based on the LIV system, and we can first ensure that the beam energy meets the specifications before performing NA measurement. When the shading plate moves overshoot, part of the beam will be gradually blocked, resulting in a gradual decrease in light intensity. After the shading plate blocks the light, its own temperature will increase. The cooling pipe and coolant cool the shading plate, and the temperature is discharged through the cooling fan. When the tail end of the shading plate passes through the center point of the laser power meter, as the shading plate continues to move, the shading plate gradually moves away from the beam area, and the light intensity begins to increase again until the shading plate completely leaves the beam area. That is, during the movement of the shading plate, the light intensity received by the laser power meter test should be symmetrical. Assume that the vertical distance between the shading plate and the laser is d, and the light intensity of the beam of energy to be tested will have two points on the laser power meter, and the distance between the two points is set to 2x, then the NA value of the beam is .

[0007] Preferably, a rack is provided in the guide rail, and a travel gear meshing with the rack is rotatably connected below the shading plate, and the travel gear is connected to a drive motor via a pulley.

[0008] By adopting the above technical solution, the driving motor drives the travel gear to rotate, and the travel gear rotates along the rack, so that the vehicle travels along the guide rail with stable control.

[0009] Preferably, the end of the return pipe near the cooling pipe is rotatably connected to a centrifugal wheel for driving the coolant to flow from the return pipe to the heat absorption pipe, and the end of the heat absorption pipe near the cooling pipe is rotatably connected to a return wheel for driving the coolant to flow from the heat absorption pipe to the cooling pipe.

[0010] By adopting the above technical solution, the centrifugal wheel and the water return wheel provide power for the flow of the coolant, thereby improving the cooling effect.

[0011] Preferably, the output shaft of the drive motor and the pulley are connected via a transmission shaft, and both ends of the transmission shaft are slidingly connected to the output shaft of the drive motor and the pulley via splines respectively, a large transmission gear and a small transmission gear are coaxially fixed on the transmission shaft, the centrifugal wheel is coaxially provided with a centrifugal shaft, a large centrifugal gear and a small centrifugal gear are coaxially fixed on the centrifugal shaft, the large centrifugal gear and the small transmission gear are meshed with each other, the small centrifugal gear and the large transmission gear are centrifugally meshed with each other, the distance between the large transmission gear and the small transmission gear is equal to the distance between the large centrifugal gear and the small centrifugal gear, and is greater than the thickness of the large centrifugal gear, the small centrifugal gear, the large transmission gear and the small transmission gear.

[0012] By adopting the above technical solution, when the driving motor is started, the output of the starting motor drives the transmission shaft, and the rotating shaft drives the traveling gear to rotate, thereby realizing the movement of the shading plate. At the same time, when the transmission shaft rotates, the large transmission gear and the small transmission gear rotate synchronously. When the range of the shielded light is far from the light beam, the shading plate has not received the light, and the temperature is not high. At this time, the small transmission gear and the large centrifugal gear are meshed, and the transmission shaft drives the centrifugal shaft to rotate, and the rotation speed of the centrifugal shaft is slow. When the shading plate is located in the illuminated area, the temperature of the shading plate is high. At this time, the large transmission gear and the small centrifugal gear are meshed, and the transmission shaft drives the centrifugal shaft to rotate at a high speed, thereby accelerating the rotation of the centrifugal wheel, accelerating the flow rate of the coolant, and improving the cooling effect. Through the setting of the transmission shaft and the centrifugal shaft, the driving motor can drive the centrifugal wheel to rotate, and there is no need to set up an additional power mechanism, which is easy to use and reduces the weight of the device.

[0013] Preferably, the water return wheel is coaxially connected to a water return shaft, and the water return shaft and the centrifugal shaft are connected via a synchronous belt.

[0014] By adopting the above technical solution, the return water wheel is connected to the centrifugal wheel through a synchronous belt, and the two rotate synchronously, further accelerating the flow of the coolant.

[0015] Preferably, the guide rail includes a detection section directly opposite to the laser power meter and running sections located at both ends of the detection section, magnetic blocks with opposite polarities are provided at both ends of the detection section, the axes of the magnetic blocks are parallel to the axis of the pulley, and a magnetic part is provided at the end of the transmission shaft close to the pulley.

[0016] By adopting the above technical solution, the irradiation area of ​​the light beam emitted by the laser is located in the middle of the detection section. When the shading plate moves on the running section, the rotation speed of the centrifugal wheel is slow. When the shading plate is about to enter the detection section, the magnetic block at the end of the detection section exerts magnetic force on the magnetic part, thereby changing the position of the transmission shaft. When the shading plate enters the detection section, the rotation speed of the centrifugal wheel is fast, thereby ensuring the cooling effect of the shading plate. When the shading plate completely passes the illumination area and is about to leave the detection section, the magnetic block at the end of the detection section exerts a reverse force on the magnetic part, again changing the position of the transmission shaft, so that the centrifugal wheel is reduced to a low speed again. Through the setting of the magnetic block and the magnetic part, the rotation speed of the centrifugal wheel can be switched automatically during the normal driving of the shading plate, without the need for additional operations, and is easy to use.

[0017] Preferably, the magnetic block is an electromagnet.

[0018] By adopting the above technical solution, the polarity and magnetic force of the magnetic block can be controlled, so that it can be adjusted according to the use requirements, which is convenient to use. When the detection is completed and the shading plate is reset, the magnetic block can also be powered off to make it lose its magnetism, so that the shading plate can move from the end of the guide rail to the head end at high speed without switching.

[0019] Preferably, a limit groove is provided on the inner wall of the output shaft of the driving motor along the axial direction, and a limit block is fixed on the outer wall of the transmission shaft and is slidably connected to the limit groove. When the limit block is located at one end of the limit groove, the large centrifugal gear and the small transmission gear are in contact and meshing contact. When the limit block is located at the other end of the limit groove, the small centrifugal gear and the large transmission gear are in centrifugal contact and meshing contact, and the transmission shaft is always connected to the pulley.

[0020] By adopting the above technical solution, the limit block and the limit groove limit the movement path of the transmission shaft to prevent it from being separated from the pulley or the driving motor.

[0021] In summary, this application includes the following beneficial technical effects: The shading plate is integrated into the LIV measurement system of the optical fiber module without changing the original layout of the LIV measurement system of the optical fiber module, and the NA value test can be realized at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the NA test in the embodiment; Figure 2 It is a structural schematic diagram of an embodiment; Figure 3 is a top view of a sunshade in an embodiment; Figure 4 is a schematic diagram of the internal structure of the sunshade in the embodiment; Figure 5is a schematic diagram of the connection between the driving motor and the transmission shaft in the embodiment; Figure 6 Schematic diagram of the connection between the transmission shaft and the centrifugal shaft in the embodiment.

[0023] Description of reference numerals: 1. Laser; 2. Laser power meter; 3. Sunshade; 4. Guide rail; 41. Rack; 5. Cooling pipe; 51. Cooling pipe; 52. Heat absorption pipe; 53. Return pipe; 54. Centrifugal wheel; 55. Return wheel; 56. Centrifugal shaft; 561. Large centrifugal gear; 562. Small centrifugal gear; 57. Return shaft; 58. Synchronous belt; 6. Cooling fan; 71. Travel gear; 72. Auxiliary gear; 73. Drive motor; 731. Limiting groove; 74. Pulley; 8. Transmission shaft; 81. Large transmission gear; 82. Small transmission gear; 83. Limiting block. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0025] Example

[0026] The present application embodiment discloses a fiber laser module beam NA test device, referring to Figure 1 to Figure 2 , including a laser 1 and a laser power meter 2 facing the laser 1 , and the laser emitted by the laser 1 can be irradiated on the laser power meter 2 in a straight line.

[0027] Reference Figures 1 to 3 A vertically placed guide rail 4 is provided between the laser 1 and the laser power meter 2, and the straight line where the laser 1 and the laser power meter 2 are located is perpendicular to the straight line where the guide rail 4 is located. A shading plate 3 is slidably connected in the guide rail 4. A rack 41 is fixed at the bottom of the guide rail 4, and a travel gear 71 and a plurality of auxiliary gears 72 that mesh with the rack 41 are rotatably connected below the shading plate 3. The travel gear 71 is connected to a driving motor 73 through a pulley 74. The driving motor 73 is coaxially connected to the pulley 74 through a transmission shaft 8, and the pulley 74 drives the travel gear 71 to rotate, thereby driving the shading plate 3 to perform linear motion along the guide rail 4.

[0028] Reference Figures 2 to 4 A cooling pipe 5 is provided in the sunshade 3, and the cooling pipe 5 is filled with a coolant to cool the sunshade 3. A cooling fan 6 is provided below the sunshade 3, and the cooling pipe 5 includes a cooling pipe 51 facing the cooling fan 6 and a heat absorbing pipe 52 located inside the sunshade 3, and the cooling pipe 51 and the heat absorbing pipe 52 are connected through a return pipe 53. The coolant absorbs heat and cools the sunshade 3 in the heat absorbing pipe 52, and then dissipates the heat through the cooling pipe 51, thereby circulating.

[0029] Reference Figures 2 to 4The end of the return pipe 53 near the cooling pipe 51 is rotatably connected to a centrifugal wheel 54 for driving the coolant to flow from the return pipe 53 to the heat absorption pipe 52, and the end of the heat absorption pipe 52 near the cooling pipe 51 is rotatably connected to a return wheel 55 for driving the coolant to flow from the heat absorption pipe 52 to the cooling pipe 51. The centrifugal wheel 54 is coaxially connected to a centrifugal shaft 56, and the return wheel 55 is coaxially connected to a return shaft 57, and the return shaft 57 and the centrifugal shaft 56 are connected by a synchronous belt 58. The centrifugal wheel 54 and the return wheel 55 rotate in the cooling pipe 5, exerting thrust on the coolant, so that the coolant can flow in the cooling pipe 5, thereby improving the cooling effect.

[0030] Reference Figures 2 to 4 The end of the centrifugal shaft 56 extends out of the shading plate 3 and is connected to the transmission shaft 8 through a transmission mechanism. The transmission shaft 8 drives the centrifugal shaft 56 and the return water shaft 57 to rotate through the transmission mechanism, that is, drives the centrifugal wheel 54 and the return water wheel 55 to rotate, thereby promoting the flow of the coolant.

[0031] Reference Figures 2 to 5 The output shaft of the driving motor 73 is coaxially provided with a socket, and the end of the transmission shaft 8 is slidably connected in the socket. The transmission shaft 8 and the output shaft are slidably connected by splines, and the transmission shaft 8 can slide along its own axis. The other end of the transmission shaft 8 is slidably connected to the pulley 74 by splines. That is, the transmission shaft 8 can perform linear motion between the pulley 74 and the driving motor 73.

[0032] Reference Figures 2 to 5 The inner wall of the jack is provided with a strip-shaped limit groove 731 along the axial direction of the output shaft, and the outer wall of the transmission shaft 8 is fixed with a limit block 83 that is slidably connected to the limit groove 731. The limit block 83 and the limit groove 731 limit the travel of the transmission shaft 8, ensuring that the transmission shaft 8 is always connected to the pulley 74 and the output shaft.

[0033] Reference Figures 3 to 6 The transmission mechanism includes a large centrifugal gear 561, a small centrifugal gear 562, a large transmission gear 81 and a small transmission gear 82. The large transmission gear 81 and the small transmission gear 82 are coaxially fixed on the transmission shaft 8, the large centrifugal gear 561 and the small centrifugal gear 562 are coaxially fixed on the centrifugal shaft 56, the large transmission gear 81 is meshed with the small centrifugal gear 562, and the small transmission gear 82 is meshed with the large centrifugal gear 561.

[0034] Reference Figures 3 to 6, the distance between the large transmission gear 81 and the small transmission gear 82 is equal to the distance between the large centrifugal gear 561 and the small centrifugal gear 562, and the distance is greater than the thickness of the large centrifugal gear 561, the small centrifugal gear 562, the large transmission gear 81 and the small transmission gear 82. It is used to ensure that when the limit block 83 is located at one end of the limit groove 731, the large transmission gear 81 is meshed and connected with the small centrifugal gear 562, and the small transmission gear 82 is separated from the large centrifugal gear 561; when the limit block 83 is located at the other end of the limit groove 731, the small transmission gear 82 is meshed and connected with the large centrifugal gear 561, and the large transmission gear 81 is separated from the small centrifugal gear 562.

[0035] Reference Figures 2 to 6 When the shielding plate 3 is far from the range of the light beam, the shielding plate 3 has not received the light, and the temperature is not high. At this time, the small transmission gear 82 and the large centrifugal gear 561 are meshed, and the transmission shaft 8 drives the centrifugal shaft 56 to rotate, and the rotation speed of the centrifugal shaft 56 is relatively slow. When the shielding plate 3 is located in the light-irradiated area, the temperature of the shielding plate 3 is high. At this time, the large transmission gear 81 and the small centrifugal gear 562 are meshed, and the transmission shaft 8 drives the centrifugal shaft 56 to rotate at a high speed, thereby accelerating the rotation of the centrifugal wheel 54, accelerating the flow rate of the coolant, and improving the cooling effect.

[0036] Reference Figures 2 to 6 The guide rail 4 includes a detection section directly facing the laser power meter 2 and a running section located at both ends of the detection section. The illumination area emitted by the laser 1 is located in the detection section, and the width of the illumination area is smaller than the length of the detection section. Magnetic blocks with opposite polarities are provided at both ends of the detection section, and the magnetic blocks are electromagnets. The axis of the magnetic block is parallel to the axis of the pulley 74, and a magnetic piece is provided at the end of the transmission shaft 8 close to the pulley 74.

[0037] Reference Figures 2 to 6 When the sunshade 3 is moving on the running section, the rotation speed of the centrifugal wheel 54 is relatively slow. When the sunshade 3 is about to enter the detection section, the magnetic block at the end of the detection section exerts magnetic force on the magnetic part, thereby changing the position of the transmission shaft 8. When the sunshade 3 enters the detection section, the rotation speed of the centrifugal wheel 54 is relatively fast, thereby ensuring the cooling effect of the sunshade 3. When the sunshade 3 completely crosses the illumination area and is about to leave the detection section, the magnetic block at the end of the detection section exerts a reverse force on the magnetic part, again changing the position of the transmission shaft 8, so that the centrifugal wheel 54 is reduced to a low speed again. Through the setting of the magnetic block and the magnetic part, the rotation speed of the centrifugal wheel 54 can be switched automatically during the normal driving of the sunshade 3, without the need for additional operations, and is easy to use.

[0038] The implementation principle of the optical fiber laser module beam NA test device of the embodiment of the present application is: when the light beam is gradually blocked, the cross-sectional distribution of the light beam is analyzed by detecting the change of light intensity, thereby determining the size of the light spot.

[0039] The operator installs the laser 1, and places a shading plate 3 in a direction perpendicular to the light emitting direction. The distance between the shading plate 3 and the optical fiber head is d. The driving motor 73 controls the movement in the vertical direction. A laser power meter 2 is placed behind the shading plate 3 to read the energy of the incoming light beam.

[0040] Gradually block the light beam: move the shading plate 3 to the path of the light beam. Initially, the shading plate 3 is completely outside the light beam and the light beam is not blocked.

[0041] Gradually enter the light beam path: control the driving motor 73 to move the shading plate 3. When the shading plate 3 gradually enters the light beam, part of the light beam will be blocked, causing the light intensity to gradually decrease.

[0042] Measuring light intensity changes: The relationship between the intensity of the light passing through and the position of the light shielding plate 3 is measured by the laser power meter 2. As the light shielding plate 3 shields more light beams, the light intensity received by the laser power meter 2 gradually decreases.

[0043] Analyze the light intensity variation curve: record the relationship between the position of the shading plate 3 and the light intensity, and draw a light intensity variation curve.

[0044] Calculate NA: Calculate NA according to the requirements. If the NA value of 95% energy is required, the positions of 2.5% and 97.5% can be found. The distance between the two is 2x. The corresponding positions can be substituted into the trigonometric function calculation formula, that is, .

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fiber laser module beam NA test device, comprising a laser (1) and a laser power meter (2) directly opposite to the laser (1), and a light shielding plate (3) slidably connected between the laser (1) and the laser power meter (2), wherein the sliding direction of the light shielding plate (3) is perpendicular to the light emission direction of the laser (1), and characterized in that: The invention also comprises a guide rail (4) arranged between the laser (1) and the laser power meter (2); the shading plate (3) is slidably connected in the guide rail (4); a cooling pipe (5) is arranged in the shading plate (3); the cooling pipe (5) is filled with cooling liquid; a cooling fan (6) is arranged below the shading plate (3); the cooling pipe (5) comprises a cooling pipe (51) facing the cooling fan (6) and a heat absorbing pipe (52) located inside the shading plate (3); the cooling pipe (51) and the heat absorbing pipe (52) are connected via a return pipe (53).

2. The optical fiber laser module beam NA test device according to claim 1, characterized in that: A rack (41) is provided in the guide rail (4), and a travel gear (71) meshing with the rack (41) is rotatably connected below the shading plate (3), and the travel gear (71) is connected to a drive motor (73) via a pulley (74).

3. The optical fiber laser module beam NA test device according to claim 2, characterized in that: The end of the return pipe (53) close to the cooling pipe (51) is rotatably connected to a centrifugal wheel (54) for driving the coolant to flow from the return pipe (53) to the heat absorption pipe (52), and the end of the heat absorption pipe (52) close to the cooling pipe (51) is rotatably connected to a return wheel (55) for driving the coolant to flow from the heat absorption pipe (52) to the cooling pipe (51).

4. The optical fiber laser module beam NA test device according to claim 3, characterized in that: The output shaft of the drive motor (73) and the pulley (74) are connected via a transmission shaft (8), and the two ends of the transmission shaft (8) are respectively slidably connected to the output shaft of the drive motor (73) and the pulley (74) via splines. A large transmission gear (81) and a small transmission gear (82) are coaxially fixed on the transmission shaft (8), and a centrifugal shaft (56) is coaxially provided on the centrifugal wheel (54), and a large centrifugal gear (561) and a small centrifugal gear (562) are coaxially fixed on the centrifugal shaft (56). 62), the large centrifugal gear (561) and the small transmission gear (82) are meshed and matched, the small centrifugal gear (562) and the large transmission gear (81) are centrifugally meshed and matched, the distance between the large transmission gear (81) and the small transmission gear (82) is equal to the distance between the large centrifugal gear (561) and the small centrifugal gear (562), and is greater than the thickness of the large centrifugal gear (561), the small centrifugal gear (562), the large transmission gear (81) and the small transmission gear (82).

5. The optical fiber laser module beam NA test device according to claim 4, characterized in that: The water return wheel (55) is coaxially connected to a water return shaft (57), and the water return shaft (57) and the centrifugal shaft (56) are connected via a synchronous belt (58).

6. The optical fiber laser module beam NA test device according to claim 4, characterized in that: The guide rail (4) comprises a detection section directly opposite to the laser power meter (2) and running sections located at both ends of the detection section, magnetic blocks with opposite polarities are provided at both ends of the detection section, the axes of the magnetic blocks are parallel to the axis of the pulley (74), and a magnetic part is provided at the end of the transmission shaft (8) close to the pulley (74).

7. The optical fiber laser module beam NA test device according to claim 6, characterized in that: The magnetic block is an electromagnet.

8. The optical fiber laser module beam NA test device according to claim 6, characterized in that: The inner wall of the output shaft of the driving motor (73) is provided with a limit groove (731) along the axial direction, and the outer wall of the transmission shaft (8) is fixed with a limit block (83) slidably connected to the limit groove (731); when the limit block (83) is located at one end of the limit groove (731), the large centrifugal gear (561) and the small transmission gear (82) are in contact and meshing; when the limit block (83) is located at the other end of the limit groove (731), the small centrifugal gear (562) and the large transmission gear (81) are in centrifugal contact and meshing, and the transmission shaft (8) is always connected to the pulley (74).

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