Method and device for testing performance of large optical isolator

Abstract

The invention discloses a method and equipment for testing the performance of a large optical isolator. The method comprises the following steps of: controlling a camera to move in X and Y directions relative to a product, so that a product reference point on a charging tray tends to the center of a visual field of the camera and takes a picture; determining the position of a central pixel point of the photo, and measuring the distance between the position of the central pixel point and the reference point to obtain the actual coordinate of the reference point on the plane; based on the actual coordinates, obtaining coordinates of a plurality of to-be-detected areas on the product; on the basis of controlling the distance between the camera and the collimation assembly, the collimation assembly is controlled to carry out light passing testing and recording on each to-be-tested area. Precise positioning and testing of a plurality of products of the same batch can be completed at a time, the energy of multiple times of feeding and discharging on product position correction is reduced, a magnetic field mode formed by the strip-shaped magnets is adopted, and the difficulty of isolator conditions formed by product feeding is simplified.

Description

Technical Field

[0001] This invention relates to the field of large-area performance testing technology for optical isolators, and in particular to a method and equipment for testing the performance of large-area optical isolators. Background Technology

[0002] The function of an optical isolator is to allow forward-propagating light to pass through while isolating reverse-propagating light, thereby preventing reflected light from affecting the stability of the system, similar to the function of a diode in electronic devices.

[0003] The basic principle of optical isolators is Malus's law of polarized light and Faraday's magneto-optical effect. The basic structure of a free-space optical isolator consists of a magnetic ring, a Faraday rotator, and two polarizers with the optical axes of the two polarizers at a 45° angle.

[0004] In the manufacturing process of optical isolators, small optical isolators are cut from large optical isolator sheets (i.e., a whole formed by bonding polarizers and Faraday rotators, hereinafter referred to as large isolator sheets). Before cutting, their performance is usually measured. Currently, single-sheet measurements are mostly used in the market.

[0005] The fixing method mainly involves manually placing the large isolator plate inside the magnetic ring, relying on its weak magnetism to attract it to the magnetic ring, and then placing the magnetic ring on the platform. The equipment moves the platform to scan and test the performance of each point. Because the magnetism is weak and the magnetic ring and the large isolator plate are in point contact, it is necessary to manually correct the perpendicularity of the large isolator plate to the test collimator, and it can only be tested one piece at a time, which is inefficient.

[0006] Therefore, a large-scale performance testing method and equipment for optical isolators is still needed to solve the above problems. Summary of the Invention

[0007] This invention provides a method and equipment that can solve the above-mentioned problems, enable large-scale batch testing of isolators, and achieve rapid performance testing of isolators and large-scale performance testing of optical isolators with defective markings.

[0008] The objective of this invention is achieved through the following technical solution: A method for testing the performance of large-area optical isolators, characterized by comprising: Control the camera to move relative to the product in the X and Y directions, so that the reference point of the product on the tray approaches the center of the camera's field of view and take a picture; The position of the center pixel of the photo is determined, and the distance between the position of the center pixel and the reference point is measured to obtain the actual coordinates of the reference point on the plane; Based on the actual coordinates, the coordinates of multiple areas to be measured on the product are obtained; Based on the distance between the control camera and the collimation component, the collimation component is controlled to conduct light transmission tests on each area to be tested and record the results.

[0009] Preferably, controlling the camera to move in the X and Y directions includes: The camera can be manually moved along the X and Y directions by the drive components, or the camera can be moved along the X and Y directions by the drive components by the preset program.

[0010] Preferably, obtaining the distance between the control camera and the collimation component includes: First, control the camera to move in the X and Y directions so that the center of the lens's field of view is aligned with the calibration sight; Then move the collimation component so that the light emitted perpendicularly from the collimation component falls on the calibration sight, and record the distance the collimation component moves.

[0011] Preferably, a large-area performance testing device for optical isolators includes: An upper camera assembly and an upper collimator assembly, wherein the upper camera is used to guide the upper collimator assembly toward the top of the product; Lower camera assembly and lower collimator assembly; The mobile stage is equipped with a mobile stage for placing the product to be tested, a tray, and strip magnetic components on both sides of the tray. It can move along the X and Y directions relative to the upper camera assembly and the upper collimator assembly, and the lower camera assembly and the lower collimator assembly, respectively.

[0012] Preferably, the bottom of the mobile platform is sequentially connected to a first linear module and a second linear module. The first linear module includes a first drive screw and a first motor connected to the end of the first drive screw for driving, as well as a first sliding part sleeved on the first screw and connected to the bottom of the mobile platform. The two ends of the first drive screw are connected to a support frame through bearings. The second linear module includes a second drive screw and a second motor connected to the end of the second drive screw for driving, and a second sliding part sleeved on the first drive screw and connected to the bottom of the movable platform, the second sliding part being connected to the support frame.

[0013] Preferably, a linear drive is also connected between the movable platform and the tray, the linear drive being used to drive the ejection and replacement of multiple products on the tray.

[0014] Preferably, it also includes a power receiving component that cooperates with the upper collimator assembly and the lower collimator assembly, respectively.

[0015] Preferably, the upper collimator assembly and / or lower collimator assembly further includes: A connecting plate, on which a collimator connector is also connected, wherein the collimator is fixed by bolts; A polarizer stage, comprising a fixed base and a rotating ring rotatably connected to the fixed base and provided with a loading groove, the bottom of the rotating ring extending out from the polarizer stage and connected to a motor via a belt, the rotating ring being provided with scale lines.

[0016] Preferably, the tray includes a material carrier plate and a fixing plate detachably connected to the material carrier plate. The material carrier plate is provided with a plurality of linearly distributed material slots, and the fixing plate is used to overlap the product edge in the material slots.

[0017] Compared with the prior art, the beneficial effects of the present invention include at least the following: The system uses a camera to identify and determine reference points on the product, and then transmits the actual position of these reference points on the plane to the control system in the photos taken by the camera. This information is recorded. The system can then precisely guide the alignment components to move to the top and bottom of the product to quickly and accurately identify and detect multiple points on the product, forming a detection record. It can complete the precise positioning and testing of multiple products in the same batch in a single operation, reducing the effort required for product position correction during multiple loading and unloading operations. Furthermore, the use of a magnetic field formed by bar magnets simplifies the difficulty of creating isolation conditions for product loading. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the testing equipment according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the mobile platform structure according to an embodiment of the present invention. Figure 1 ; Figure 3 yes Figure 2 Enlarged view of a portion at point A; Figure 4 This is a schematic diagram of the mobile platform structure according to an embodiment of the present invention. Figure 2 ; Figure 5 This is a partial structural diagram of the mobile platform according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the carrier plate structure according to an embodiment of the present invention.

[0019] 1. Upper camera assembly; 2. Upper collimator assembly; 3. Lower camera assembly; 4. Lower collimator assembly; 5. Moving stage; 51. Bar magnetic component; 52. Linear drive component; 53. Material carrier plate; 531. Material trough; 54. Fixing plate; 6. First linear module; 61. First drive screw; 62. First motor; 63. First sliding part; 7. Second linear module; 71. Second drive screw; 72. Second motor; 73. Second sliding part; 8. Power receiving assembly; 9. Connecting plate; 91. Collimator connector; 92. Polarizer stage; 921. Fixing base; 922. Rotating ring; 923. Motor. Detailed Implementation

[0020] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided to make the invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0021] The terms used to express position and direction in this invention are illustrated with reference to the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this invention.

[0022] Reference Figure 1-6 This invention provides a method for large-scale performance testing of optical isolators, comprising: The camera is moved in the X and Y directions to bring the product reference point on the tray closer to the center of the camera's field of view and take a picture. The movement of the tray relative to the camera, or the movement of the camera relative to the product, is not limited here. The following embodiment uses the product as the active moving component and the camera as a fixed position. After relative movement, the product has a rectangular sheet structure, and the center of the camera's field of view is the center point of the field of view. For a circular field of view, the center point is the center of the circle; for a rectangular field of view, the center point is the intersection of the diagonals.

[0023] The position of the center pixel of the photograph is determined, and the distance between the center pixel and the reference point is measured to obtain the actual coordinates of the reference point on the plane. Based on the distance from the center pixel of the photograph to the reference point on the product, and assuming the aforementioned distance of movement of the tray from coordinate system 0 relative to the camera in the X and Y directions is recorded, adding or subtracting the distance from the center pixel of the photograph to the reference point on the product gives the actual position of the product on the coordinate system.

[0024] Based on the actual coordinates, the coordinates of multiple test areas on the product are obtained. Each product has multiple test points, and the data of the test points are recorded in the system in advance. After each measurement, the movement distance is added to or subtracted from the distance between each test point.

[0025] Based on the distance between the camera and the collimation component, the collimation component is controlled to conduct light transmission tests on each area to be tested and record the results. Test commands are executed to conduct light transmission tests on each point individually. Under visual guidance, the reference points for small-sized sheet-like products can be accurately determined, thereby identifying each test point on the product. Furthermore, it allows for the testing of multiple products in a single batch, reducing the complexity of manual loading and positioning, improving testing efficiency and accuracy, and making it suitable for large-scale operations. It also includes a power receiving component 8 that cooperates with the upper collimator component 2 and the lower collimator component 4 respectively.

[0026] The control of the camera relative to the product in the X and Y directions includes: The control panel can be used to manually move the camera relative to the product in the X and Y directions under the drive of the drive component, or the control panel can read a preset program and move the camera relative to the product in the X and Y directions under the drive of the drive component. Manually pressing the linear movement button moves the camera relative to the product in the X and Y directions relative to the product, or the control panel can run a preset program to move the camera closer to the product and take a positional image.

[0027] Preferably, obtaining the distance between the control camera and the collimation component includes: First, control the camera to move in the X and Y directions so that the center of the lens's field of view is aligned with the calibration sight; Next, move the collimating assembly so that the light emitted perpendicularly from the collimating assembly falls onto the calibration sight, and record the distance the collimating assembly moves. When the center of the lens's field of view is aligned with the calibration sight, record position point one. Then move the position so that the light from the collimating assembly falls onto the calibration sight, and record position point two. The distance between these positions is the difference between the collimating assembly and the camera. By taking this difference into account, the collimating assembly can accurately test the light transmission at every point on the product, reducing the probability of errors in product testing and improving testing accuracy.

[0028] The second aspect of this invention discloses a large-scale performance testing device for optical isolators, comprising: Upper camera assembly 1 and upper collimator assembly 2, wherein the upper camera is used to guide the upper collimator assembly 2 toward the top of the product; The lower camera assembly 3 and the lower collimator assembly 4 are configured to guide the lower collimator assembly 4 in testing the bottom of the product. The upper camera assembly 1 and the upper collimator assembly 2 are connected by a connecting bracket and positioned on top of the movable platform 5. The lower camera assembly 3 and the lower collimator assembly 4 are located below the movable platform 5, providing... The mobile stage 5 is equipped with a tray for placing the products to be tested, and bar magnetic components 51 on both sides of the tray. It can move along the X and Y directions relative to the upper camera assembly 1 and upper collimator assembly 2, and the lower camera assembly 3 and lower collimator assembly 4, respectively. By using the movable stage 5 to place multiple products to be tested in a single batch, the positional correction of the products can be reduced. The actual reference point on the plane is determined from the photographs taken by the camera and transmitted to the control system for recording. Then, the collimator assembly can be precisely guided to move to the top and bottom of the product to quickly and accurately identify and detect multiple points on the product, forming a test record. This allows for precise positioning and testing of multiple products in the same batch in a single operation, reducing the effort required for product positional correction during multiple loading and unloading operations. Furthermore, the use of a magnetic field formed by the bar magnets simplifies the difficulty of creating the isolation conditions for product loading.

[0029] Preferably, the bottom of the mobile platform 5 is sequentially connected to a first linear module 6 and a second linear module 7. The first linear module 6 includes a first drive screw 61 and a first motor 62 connected to the end of the first drive screw 61 for driving, and a first sliding part 63 sleeved on the first screw and connected to the bottom of the mobile platform 5. The two ends of the first drive screw 61 are connected to a support frame through bearings.

[0030] The second linear module 7 includes a second drive screw 71 and a second motor 72 connected to the end of the second drive screw 71 for driving, and a second sliding part 73 sleeved on the first screw and connected to the bottom of the movable platform 5, the second sliding part 73 being connected to the support frame. The first motor 62 and the second motor 72 are electrically connected to a controller, which controls the rotation stroke. By setting the first linear module 6 and the second linear module 7, the product can move stably in the X and Y directions in the plane, facilitating precise control and high-precision detection of each product.

[0031] Preferably, a linear drive 52 is also connected between the movable platform 5 and the tray. The linear drive 52 is used to drive the ejection and replacement of multiple products on the tray. The linear drive 52 is, for example, a cylinder or an electric telescopic rod. During operation, after a group of products has been completely inspected, the moving end of the linear drive 52 is connected to one end of the tray. The tray is connected to a slide rail via a crossbar. When the electric telescopic rod or cylinder extends or retracts, it drives the crossbar to slide linearly under the assistance of the slide rail. Simultaneously, the movable platform 5 is provided with slots to allow light to shine from the bottom towards the top. By using the linear drive 52 to eject the tray after inspection, it facilitates loading and unloading by employees and avoids interference from the modules above.

[0032] In one embodiment, the upper collimator assembly 2 and / or the lower collimator assembly 4 further includes: A connecting plate 9 is provided, and a collimator connector 91 is also connected to the connecting plate 9. The collimator connector 91 is fixed to the collimator by screwing in bolts. The collimator connector 91 is a plate-shaped piece, which is fixed to the connecting plate 9 by the action of bolts.

[0033] A polarizer stage 92 includes a fixed base 921 and a rotating ring 922 rotatably connected to the fixed base 921 and equipped with a loading slot. The bottom of the rotating ring 922 extends from the polarizer stage 92 and is connected to a motor 923 via a belt. The rotating ring 922 has graduations. Since polarizers are consumable parts, a loading slot is provided for placing a polarizer in the slot for adjustment. The motor 923 drives the polarizer to rotate until the transmitted light reaches a preset angle. At this point, the graduation on the rotating ring 922 facing the user is recorded. When replacing a polarizer, the motor 923 rotates the polarizer to the previously recorded graduation position, facilitating quick replacement and improving work efficiency.

[0034] Preferably, the tray includes a material carrier plate 53 and a fixing plate 54 detachably connected to the material carrier plate 53. The material carrier plate 53 is provided with a plurality of linearly distributed material slots 531, and the fixing plate 54 is used to overlap the edge of the product in the material slots 531. The fixing plate 54 has a rectangular groove with a structure similar to that on the material carrier plate 53. When the fixing plate 54 is fastened to the material carrier plate 53, the edge of the groove of the fixing plate 54 presses against the perimeter of the product, thereby quickly fixing the perimeter of the product and reducing inaccurate test results and low efficiency caused by unstable positioning.

[0035] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the invention without departing from the principles and spirit of the invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A method for testing the performance of a large-area optical isolator, characterized in that, include: Control the camera to move relative to the product in the X and Y directions, so that the reference point of the product on the tray approaches the center of the camera's field of view and take a picture; The position of the center pixel of the photo is determined, and the distance between the position of the center pixel and the reference point is measured to obtain the actual coordinates of the reference point on the plane; Based on the actual coordinates, the coordinates of multiple areas to be measured on the product are obtained; Based on the distance between the control camera and the collimation component, the collimation component is controlled to conduct light transmission tests on each area to be tested and record the results.

2. The method for testing the performance of a large optical isolator according to claim 1, characterized in that, The control of the camera relative to the product in the X and Y directions includes: The camera can be manually moved relative to each other in the X and Y directions by the drive components, or the camera can be moved relative to each other in the X and Y directions by the drive components by the preset program.

3. The method for testing the performance of a large-area optical isolator according to claim 1, characterized in that, The acquisition of the distance between the control camera and the collimation component includes: First, control the camera to move in the X and Y directions so that the center of the lens's field of view is aligned with the calibration sight; Then move the collimation component so that the light emitted perpendicularly from the collimation component falls on the calibration sight, and record the distance the collimation component moves.

4. A large-scale performance testing device for optical isolators, characterized in that, include: An upper camera assembly and an upper collimator assembly, wherein the upper camera is used to guide the upper collimator assembly to test the top of the product; A lower camera assembly and a lower collimator assembly, wherein the lower camera assembly is used to guide the lower collimator assembly to test the bottom of the product; The mobile stage is equipped with a mobile stage for placing the product to be tested, a tray, and strip magnetic components on both sides of the tray. It can move along the X and Y directions relative to the upper camera assembly and the upper collimator assembly, and the lower camera assembly and the lower collimator assembly, respectively.

5. The large-area performance testing equipment for optical isolators according to claim 4, characterized in that, The bottom of the mobile platform is sequentially connected to a first linear module and a second linear module. The first linear module includes a first drive screw and a first motor connected to the end of the first drive screw for driving, as well as a first sliding part sleeved on the first screw and connected to the bottom of the mobile platform. The two ends of the first drive screw are connected to a support frame through bearings. The second linear module includes a second drive screw and a second motor connected to the end of the second drive screw for driving, and a second sliding part sleeved on the first drive screw and connected to the bottom of the movable platform, the second sliding part being connected to the support frame.

6. The large-area performance testing equipment for optical isolators according to claim 4, characterized in that, A linear drive is also connected between the movable platform and the tray, and the linear drive is used to drive the ejection and replacement of multiple products on the tray.

7. The large-area performance testing equipment for optical isolators according to claim 4, characterized in that, It also includes power receiving components that cooperate with the upper collimator assembly and the lower collimator assembly, respectively.

8. The large-area performance testing equipment for optical isolators according to claim 4, characterized in that, The upper collimator assembly and / or lower collimator assembly further include: A connecting plate, on which a collimator connector is also connected, wherein the collimator is fixed by bolts; A polarizer stage, comprising a fixed base and a rotating ring rotatably connected to the fixed base and provided with a loading groove, the bottom of the rotating ring extending out from the polarizer stage and connected to a motor via a belt, the rotating ring being provided with scale lines.

9. The large-area performance testing equipment for optical isolators according to claim 4, characterized in that, The tray includes a material carrier plate and a fixing plate detachably connected to the material carrier plate. The material carrier plate is provided with a plurality of linearly distributed material slots, and the fixing plate is used to overlap the product edge in the material slots.

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