Optical power measuring device

Abstract

The invention discloses an optical power measuring device, and relates to the technical field of optical measurement, the optical power measuring device comprises a reflector and an optical power meter, the reflector comprises a reflecting surface, and the optical power meter comprises a light sensing surface; the reflecting mirror is arranged in a to-be-measured area and used for reflecting light rays emitted to the to-be-measured area by the to-be-measured optical machine through the reflecting surface when the to-be-measured optical machine generates the projection picture and forming a reflecting light path, and the to-be-measured area is an area to be subjected to optical power measurement in the projection picture; and the optical power meter is arranged on the reflection light path and is used for receiving the light transmitted by the reflection light path through the light sensing surface and performing optical power measurement on the to-be-measured area according to the received light to obtain an optical power measurement value corresponding to the to-be-measured area. According to the invention, optical power measurement can be carried out on the DLP projection light machine with a small projection picture size without customizing an optical power meter with a small-size light-sensitive surface.

Description

Technical Field

[0001] This application relates to the field of optical measurement technologies, and particularly to an optical power measurement device. Background Art

[0002] In the field of 3D printing technology, Digital Light Processing (DLP) has become one of the core technologies of light-curing 3D printing systems due to its high precision and rapid prototyping characteristics. DLP 3D printing devices usually project a preset pattern accurately onto the surface of photosensitive resin through a monochromatic DLP projector in the UV (Ultraviolet) band, layer by layer curing to construct a three-dimensional model. To ensure the printing quality and process consistency, it is crucial to accurately measure and calibrate the optical power of each area of the projection screen, because this directly affects the curing effect of the photosensitive resin and the quality of the final product.

[0003] Currently, the size of the projection screen of DLP projectors is relatively small, usually only a few centimeters to more than a dozen centimeters, while the size of the photosensitive surface of standard optical power meters is relatively large. When using a standard optical power meter to measure the optical power of the projection screen of a DLP projector, it is difficult to accurately locate and measure the optical power of a specific area in the projection screen. In this regard, a feasible method is to customize an optical power meter with a small-sized photosensitive surface to measure the optical power of a DLP projector with a small-sized projection screen, but there is a problem of too high cost. Summary of the Invention

[0004] The main purpose of this application is to provide an optical power measurement device, aiming to solve the technical problem of too high cost of customizing an optical power meter with a small-sized photosensitive surface when measuring the optical power of a DLP projector with a small-sized projection screen in related technologies.

[0005] To achieve the above purpose, this application provides an optical power measurement device, which includes a reflector and an optical power meter. The reflector includes a reflecting surface, and the optical power meter includes a photosensitive surface; The reflector is disposed in the area to be measured, and is used for reflecting the light emitted by the optical machine to be measured to the area to be measured through the reflecting surface when the optical machine to be measured generates a projection screen, and forming a reflected light path, where the area to be measured is the area in the projection screen to be measured for optical power; The optical power meter is disposed on the reflected light path, and is used for receiving the light conducted by the reflected light path through the photosensitive surface, and measuring the optical power of the area to be measured according to the received light to obtain the optical power measurement value corresponding to the area to be measured.

[0006] In one embodiment, the photosensitive surface is configured such that when receiving the light conducted by the reflected light path, the incident angle of the light is less than a preset angle.

[0007] In one embodiment, the device further includes a mirror bracket detachably connected to the mirror for fixing the mirror to the area to be measured.

[0008] In one embodiment, the mirror bracket includes a mirror fixing member detachably connected to the mirror, and a mirror moving platform movably connected to the mirror fixing member; The mirror fixing member is used to fix the mirror; The mirror moving platform is used to move the mirror fixing member to fix the mirror to the area to be measured.

[0009] In one embodiment, the device further includes an optical power meter bracket detachably connected to the optical power meter, and the optical power meter bracket is used to fix the optical power meter to the reflected light path.

[0010] In one embodiment, the optical power meter bracket includes an optical power meter fixing member detachably connected to the optical power meter, and an optical power meter moving platform movably connected to the optical power meter fixing member; The optical power meter fixing member is used to fix the optical power meter; The optical power meter moving platform is used to move the optical power meter fixing member to fix the optical power meter to the reflected light path.

[0011] In one embodiment, the optical power meter fixing member includes a rotating unit for rotating the optical power meter so that the light receiving surface is set such that when receiving the light conducted along the reflected light path, the incident angle of the light is less than a preset angle.

[0012] In one embodiment, the device further includes a central control unit connected to the optical power meter, and the central control unit is configured to: Obtain the optical power measurement value corresponding to the area to be measured measured by the optical power meter, and the size of the reflection surface; Calculate the optical power density corresponding to the area to be measured according to the optical power measurement value and the size of the reflection surface.

[0013] In one embodiment, the light emitted by the optical machine to be measured is monochromatic light, and the central control unit is further configured to: Obtain the reflectivity of the reflection surface for the monochromatic light calibrated in advance, and calculate the optical power density corresponding to the area to be measured according to the optical power measurement value, the size of the reflection surface, and the reflectivity.

[0014] In one embodiment, the mirror moving platform is parallel to the projection screen, the central control unit is connected to the mirror moving platform, and the central control unit is further configured to: Determine the coordinates to be measured corresponding to the area to be measured, and control the mirror moving platform to move the mirror fixing member according to the coordinates to be measured until the mirror is fixed to the area to be measured.

[0015] In one embodiment, the mirror moving platform is parallel to the optical power meter moving platform, and the central control unit is further connected to the optical power meter moving platform. The central control unit is further configured to: Determine the first linear distance between the optical engine to be measured and the mirror moving platform, and the second linear distance between the mirror moving platform and the optical power meter moving platform; Calculate the optical path angle between the reflected optical path and the mirror moving platform according to the coordinates to be measured and the first linear distance; Calculate the intersection coordinates between the reflected optical path and the optical power meter moving platform according to the optical path angle and the second linear distance; Control the optical power meter moving platform to move the optical power meter fixing member according to the intersection coordinates until the optical power meter is fixed to the reflected optical path.

[0016] In one embodiment, the central control unit is further connected to the rotation unit. The central control unit is further configured to: Control the rotation unit to rotate the optical power meter according to the optical path angle until the incident angle of the light is less than a preset angle when the photosensitive surface receives the light conducted by the reflected optical path.

[0017] Since the projection screen size of the DLP projection optical engine is relatively small, usually only a few centimeters to more than ten centimeters, while the photosensitive surface size of the standard optical power meter is relatively large, it is difficult to accurately locate and measure the optical power of a specific area in the projection screen when using a standard optical power meter to measure the optical power of the projection screen of the DLP projection optical engine.

[0018] In contrast, the embodiment of the present application provides an optical power measurement device, including a reflector and an optical power meter. The reflector includes a reflecting surface, and the optical power meter includes a photosensitive surface. The reflector is disposed in the area to be measured, and is configured to reflect the light emitted by the optical machine to be measured to the area to be measured through the reflecting surface when the projection screen is generated by the optical machine to be measured, and form a reflected light path. Wherein, the area to be measured is the area in the projection screen where the optical power is to be measured. The optical power meter is disposed on the reflected light path, and is configured to receive the light conducted by the reflected light path through the photosensitive surface, and measure the optical power of the area to be measured according to the received light, so as to obtain the optical power measurement value corresponding to the area to be measured. Instead of choosing to make high-cost miniaturization improvements to the structure of the optical power meter, the embodiment of the present application takes a different approach. A reflector with a reflecting surface size equivalent to the area to be measured is introduced at the area to be measured of the projection screen, accurately covering the area to be measured. Thus, through the reflection method, the light emitted by the optical machine to be measured to the area to be measured is "guided" to the photosensitive surface of the standard optical power meter, realizing the indirect measurement of the optical power at the area to be measured.

[0019] With this optical power measurement device, the embodiment of the present application simplifies the high-cost miniaturization improvement of the standard optical power meter into the low-cost customization and precise matching of the reflecting surface size of the reflector. Thus, without changing the structure of the standard optical power meter, the precise measurement of the optical power of a specific area in a small projection area is realized. This not only effectively avoids the high cost brought by customizing a miniaturized optical power meter, but also improves the adaptability and practicality of the measurement system, and further achieves the technical effects of reducing costs, improving measurement accuracy, and operation feasibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0021] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of the optical power measurement device provided by the first embodiment of the present application; Figure 2 It is a schematic structural diagram of the reflector bracket in the optical power measurement device of the embodiment of the present application; Figure 3 It is a schematic scene diagram of the reflector bracket in the optical power measurement device of the embodiment of the present application; Figure 4This is a schematic structural diagram of the optical power meter bracket in the optical power measurement device according to the embodiments of the present application; Figure 5 This is a schematic diagram of the angle adjustment of the test probe in the optical power measurement device according to the embodiments of the present application; Figure 6 This is a schematic diagram of the point position for optical power measurement in a specific embodiment of the present application.

[0023] Explanation of the attached drawing numbers: 100, optical power measurement device; 1, reflecting mirror; 2, optical power meter; 3, reflecting mirror bracket, 31, reflecting mirror fixing member, 32, reflecting mirror moving platform; 4, optical power meter bracket, 41, optical power meter fixing member, 411, rotating unit, 42, optical power meter moving platform; 5, optical machine to be measured; 6, projection screen.

[0024] The realization of the purpose, functional features and advantages of the present application will be further described with reference to the embodiments and the attached drawings. Specific embodiments

[0025] Here, the exemplary embodiments will be described in detail, and the examples are shown in the attached drawings. When the following description refers to the attached drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are only examples of the devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0026] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0027] Since the projection screen size of the DLP projection optical machine is relatively small, usually only a few centimeters to more than a dozen centimeters, while the photosensitive surface size of the standard optical power meter is relatively large, it is difficult to accurately locate and measure the optical power of a specific area in the projection screen when using a standard optical power meter to measure the optical power of the projection screen of the DLP projection optical machine.

[0028] In contrast, the optical power measurement device provided by the embodiments of the present application does not choose to make a high-cost miniaturization improvement on the structure of the optical power meter. Instead, it takes a different approach and introduces a reflecting mirror with a reflecting surface size equivalent to the area to be measured at the area to be measured of the projection screen, accurately covering the area to be measured. Thus, through the reflection method, the light rays emitted by the optical machine to be measured to the area to be measured are "guided" to the photosensitive surface of the standard optical power meter, realizing the indirect measurement of the optical power at the area to be measured.

[0029] With this optical power measurement device, the embodiment of the present application simplifies the high-cost miniaturization improvement of a standard optical power meter to the low-cost customization and precise matching of the reflection surface size of a mirror. Thus, without changing the structure of the standard optical power meter, it can achieve precise measurement of the optical power in a specific area within a tiny projection area, effectively avoiding the high cost of customizing a miniaturized optical power meter, enhancing the adaptability and practicality of the measurement system, and further achieving the technical effects of reducing costs, improving measurement accuracy, and operation feasibility.

[0030] To better understand the technical solution of the present application, the following will be described in detail in combination with the accompanying drawings of the specification and specific implementation manners.

[0031] The present application proposes an optical power measurement device of the first embodiment.

[0032] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the optical power measurement device provided by the first embodiment of the present application.

[0033] In this embodiment, the optical power measurement device 100 includes a mirror 1 and an optical power meter 2. The mirror 1 includes a reflection surface, and the optical power meter 2 includes a photosensitive surface; The mirror 1 is disposed in the area to be measured and is used to reflect the light emitted by the optical machine 5 to be measured to the area to be measured through the reflection surface when the projection screen 6 is generated by the optical machine 5 to be measured, and form a reflection optical path. Herein, the area to be measured is the area in the projection screen 6 where the optical power needs to be measured; The optical power meter 2 is disposed on the reflection optical path and is used to receive the light conducted by the reflection optical path through the photosensitive surface and measure the optical power of the area to be measured according to the received light to obtain the optical power measurement value corresponding to the area to be measured.

[0034] Those skilled in the art know that the mirror 1 is an optical element with a surface reflection function for reflecting incident light at a certain angle. The reflection surface refers to the effective surface on the mirror 1 that plays a reflection role, and the reflection optical path refers to the optical propagation path formed when light reflects when encountering the interface of different media during propagation. The optical power meter 2 is a standard instrument for measuring the optical power of incident light and includes components such as a detector (also called a test probe), an amplifier circuit, and a display unit. Optical power refers to the rate of optical energy passing through a certain cross-section, usually measured in watts (W). The photosensitive surface refers to the surface of the detector where photosensitive materials are distributed and is responsible for receiving light. Optical power measurement refers to measuring the optical power of incident light, and the optical power measurement value refers to the optical power measured by the optical power meter 2.

[0035] In this embodiment, the optical machine 5 to be measured refers to the optical machine for which the optical power needs to be measured, and the projection screen 6 refers to the screen formed by the light emitted by the optical machine 5 to be measured.

[0036] It should be noted that in this embodiment, the optical power measurement of the machine 5 to be measured actually refers to the optical power measurement of multiple regions to be measured in the projection screen 6 generated by the machine 5 to be measured.

[0037] When this embodiment measures the optical power of the machine 5 to be measured through the optical power measurement device 100, it will first determine which regions in the projection screen 6 generated by the machine 5 to be measured need to be measured for optical power, and clarify the sizes and shapes of the regions to be measured corresponding to each region to be measured. Then, a reflector 1 with a reflecting surface of a specific size and specific shape is selected to reflect the light rays emitted by the machine 5 to be measured to the region to be measured, ensuring that the photosensitive surface of the optical power meter 2 only receives the optical signals reflected from this region to be measured, minimizing the interference of light rays from other regions in the projection screen 6, significantly improving the accuracy and reliability of the optical power measurement result, and achieving high-precision optical power measurement.

[0038] In addition, when measuring the optical power of the machine 5 to be measured in different scenarios, it may be necessary to test the optical power of regions to be measured with different sizes and / or shapes. Compared with directly making a high-cost miniaturization customization transformation of the optical power meter 2 in the related art, in this embodiment, by customizing the size and / or shape of the reflecting surface on the reflector 1, it is possible to flexibly adapt to the optical power measurement requirements in various complex situations without changing the structure of the optical power meter 2, greatly enhancing the adaptability and practicability of the system, and the cost of customizing the reflector 1 is much lower than that of customizing the optical power meter 2.

[0039] It is worth mentioning that when the reflecting surface on the reflector 1 is parallel to the projection screen 6, if the distance between the plane where the reflecting surface is located and the plane where the projection screen 6 is located is less than a preset value, these two planes can be regarded as the same plane, and then the reflecting surface should be customized to be exactly the same in shape and size as the region to be measured, so as to ensure that the reflecting surface only reflects the light rays emitted by the machine 5 to be measured to the region to be measured. However, when the reflecting surface on the reflector 1 is parallel to the projection screen 6, generally, the central region of the projection screen 6 (referring to the region covered when the projection lens of the machine 5 to be measured is orthogonally projected onto the projection screen 6. In this embodiment, the connection line between the projection lens of the machine 5 to be measured and the geometric center of the projection screen 6 is perpendicular to the plane where the projection screen 6 is located) cannot be used as the region to be measured, because when the reflector 1 is located directly in front of this central region, the light rays emitted from the machine 5 to be measured and irradiating on the central region will be reflected back to the machine 5 to be measured itself by the reflector 1. This causes the light rays not to be received by the optical power meter 2, thus preventing effective optical power measurement from being completed.

[0040] In a feasible implementation manner, the photosensitive surface is set such that when receiving the light rays conducted by the reflection optical path, the incident angle of the light rays is less than a preset angle.

[0041] As is known to those skilled in the art, the photosensitive surface of the optical power meter 2 has different response efficiencies to light rays with different incident angles. Generally speaking, when the light ray is incident at a perpendicular angle (i.e., 0-degree angle), the photosensitive material on the photosensitive surface can most effectively absorb photons and convert them into electrical signals. As the incident angle deviates from the normal direction of the photosensitive surface, the effective absorption area of the photosensitive material relative to the actual area of the incident light ray decreases, resulting in a decrease in the response efficiency, and further causing the measured value of the optical power measured by the optical power meter 2 to become smaller.

[0042] It should be noted that the preset angle is a pre-set angle used to ensure that the light ray conducted along the reflection optical path is incident on the photosensitive surface at a perpendicular or nearly perpendicular angle.

[0043] Exemplarily, the photosensitive surface is set such that when receiving the light ray conducted along the reflection optical path, the incident angle of the light ray is 0 degree (that is, the light ray conducted along the reflection optical path is incident on the photosensitive surface at a perpendicular angle, or it can also be described as: the light ray conducted along the reflection optical path is perpendicular to the photosensitive surface).

[0044] In this embodiment, by setting the photosensitive surface of the optical power meter 2 such that when receiving the light ray conducted along the reflection optical path, the incident angle of the light ray is less than the preset angle, the light ray conducted along the reflection optical path is incident on the photosensitive surface at a perpendicular or nearly perpendicular angle, thereby maximizing the light absorption efficiency of the photosensitive material, ensuring that the optical power meter 2 can accurately measure the energy of the incident light, and further improving the accuracy of the optical power measurement and guaranteeing the accuracy of the optical power measurement result.

[0045] In a feasible implementation manner, as Figure 2 shown, the optical power measurement device 100 further includes a mirror bracket 3 detachably connected to the mirror 1 for fixing the mirror 1 to the area to be measured.

[0046] It should be noted that the mirror bracket 3 is a mechanical structure for fixing and supporting the mirror 1, with an adjustable design and a detachable design, used to stably fix the mirror 1 at a specific position and adjust the angle of the mirror 1 as needed to ensure that the reflecting surface on the mirror 1 can just reflect the light ray emitted by the optical machine 5 to be measured to the area to be measured.

[0047] In this implementation manner, through the detachable design of the mirror bracket 3, the mirror 1 is installed and fixed on the mirror bracket 3, so that by adjusting the mirror bracket 3, the position and angle of the mirror 1 are changed, enabling the reflecting surface on the mirror 1 to just reflect the light ray emitted by the optical machine 5 to be measured to the area to be measured.

[0048] In this embodiment, the mirror 1 is fixed by the mirror bracket 3, which can ensure that the mirror 1 remains stable during the entire measurement period and will not be easily displaced or tilted due to external interferences (such as vibrations, airflows, etc.), thereby maintaining the consistency of the optical path and the accuracy of the measurement data, reducing the risk of accidental dropping or collision of the mirror 1 during operation, and extending the service life of the mirror 1.

[0049] In this embodiment, the detachable design of the mirror bracket 3 allows users to quickly replace the appropriate mirror 1 according to the size and shape of the specific area to be measured. This design also makes the maintenance of the mirror 1 easier. When the mirror 1 needs to be cleaned or shows wear, it can be quickly removed from the mirror bracket 3 and processed, thereby reducing the downtime and ensuring that the accuracy of the measurement results is not affected. In addition, this design also facilitates the transportation and storage of the device. Especially in multi-site use or mobile test scenarios, users can easily separate the mirror 1 from the mirror bracket 3, which is convenient for carrying and protecting the precision optical components from damage.

[0050] In this embodiment, the adjustable design of the mirror bracket 3 allows users to accurately adjust the position and angle of the mirror 1 during actual application, ensuring that the reflecting surface accurately reflects the light rays emitted by the optical machine 5 to be measured into the area to be measured, reducing the light interference from other areas, and thus providing the accuracy and reliability of the optical power measurement.

[0051] Exemplarily, in a feasible embodiment, the mirror bracket 3 includes a mirror fixing member 31 detachably connected to the mirror 1, and a mirror moving platform 32 movably connected to the mirror fixing member 31; The mirror fixing member 31 is used to fix the mirror 1; The mirror moving platform 32 is used to move the mirror fixing member 31 to fix the mirror 1 to the area to be measured.

[0052] It can be understood that after the mirror 1 is fixed to the area to be measured, the reflecting surface is fitted and matched with the area to be measured.

[0053] It should be noted that in this embodiment, the mirror bracket 3 mainly includes a mirror fixing member 31 and a mirror moving platform 32. Among them, the mirror fixing member 31 is used to fix the mirror 1 to ensure that it will not shift or loosen during the optical power measurement process. The fixing method can be vacuum adsorption, magnetic adsorption, bolt fixing, etc. The mirror moving platform 32 is a device that can drive the mirror fixing member 31 and the mirror 1 thereon to move in a two-dimensional plane.

[0054] For ease of understanding, in one example, the mirror moving platform 32 can be a rectangular flat plate that generates a magnetic field at different positions through electromagnetic induction. The mirror fixture 31 can be a clamp made of a magnet. By controlling the position of electromagnetic induction on the rectangular flat plate, the movement of the mirror fixture 31 on the upper plane of the mirror moving platform 32 can be controlled.

[0055] In another example, as Figure 3 shown, the mirror support 3 includes a mirror fixture 31 and a mirror moving platform 32. The mirror fixture 31 is used to fix the mirror 1. The mirror moving platform 32 can be a rectangular frame with a horizontal and a vertical sliding rod arranged inside. The mirror fixture 31 is located at the intersection of the two sliding rods. Based on the plane coordinate system constructed based on the projection screen 6, the horizontally placed sliding rod can slide in the plane along the vertical direction (i.e., Figure 3 the y-axis direction of the plane coordinate system in Figure 3 it), and the vertically placed sliding rod can also slide in the plane along the horizontal direction (i.e.,

[0056] the x-axis direction of the plane coordinate system in

[0057] it), thereby changing the intersection position and driving the movement of the mirror fixture 31. Figure 1 and Figure 4 , the optical power measurement device 100 further includes an optical power meter support 4 that is detachably connected to the optical power meter 2. The optical power meter support 4 is used to fix the optical power meter 2 to the reflected light path.

[0058] It should be noted that the optical power meter support 4 is a mechanical structure for fixing and supporting the optical power meter 2, with an adjustable design and a detachable design, used to move the optical power meter 2 to the reflected light path for fixing and adjust the angle of the optical power meter 2 as needed to ensure that the light conducted along the reflected light path can be incident on the photosensitive surface of the optical power meter 2 at a vertical or nearly vertical angle.

[0059] In this embodiment, through the detachable design of the optical power meter bracket 4, the optical power meter 2 is installed and fixed on the optical power meter bracket 4. Thus, by adjusting the optical power meter bracket 4, the position and angle of the optical power meter 2 are changed, and the optical power meter 2 is moved to the reflection optical path and fixed, ensuring that the light conducted along the reflection optical path can be incident on the photosensitive surface of the optical power meter 2 at a perpendicular or nearly perpendicular angle.

[0060] In this embodiment, fixing the optical power meter 2 with the optical power meter bracket 4 can ensure that the optical power meter 2 remains stable during the entire measurement process and will not be easily displaced or tilted due to external interferences (such as vibration, air flow, etc.). Thereby, the consistency of the optical path and the accuracy of the measurement data are maintained, the risk of accidental dropping or collision of the optical power meter 2 during operation is reduced, and the service life of the optical power meter 2 is extended.

[0061] In this embodiment, the detachable design of the optical power meter bracket 4 makes the maintenance of the optical power meter 2 easier. When the optical power meter 2 needs to be cleaned or shows wear, it can be quickly removed from the optical power meter bracket 4 and processed, thereby reducing the downtime and ensuring that the accuracy of the measurement results is not affected. In addition, this design also facilitates the transportation and storage of the device. Especially in multi-location use or mobile test scenarios, users can easily separate the optical power meter 2 from the optical power meter bracket 4, which is convenient for carrying and protecting the optical power meter 2 from damage.

[0062] In this embodiment, the adjustable design of the optical power meter bracket 4 allows users to precisely adjust the position and angle of the optical power meter 2 during actual application, enabling the light conducted along the reflection optical path to be incident on the photosensitive surface of the optical power meter 2 at a perpendicular or nearly perpendicular angle. Thereby, the light absorption efficiency of the photosensitive material on the photosensitive surface is maximized, ensuring that the optical power meter 2 can accurately measure the energy of the incident light, and further improving the accuracy of the optical power measurement and guaranteeing the accuracy of the optical power measurement results.

[0063] Exemplarily, in a feasible embodiment, the optical power meter bracket 4 includes an optical power meter fixing member 41 detachably connected to the optical power meter 2, and an optical power meter moving platform 42 movably connected to the optical power meter fixing member 41; The optical power meter fixing member 41 is used to fix the optical power meter 2; The optical power meter moving platform 42 is used to move the optical power meter fixing member 41 to fix the optical power meter 2 onto the reflection optical path.

[0064] It should be noted that in this embodiment, the optical power meter bracket 4 mainly includes an optical power meter fixing member 41 and an optical power meter moving platform 42. Among them, the optical power meter fixing member 41 is used to fix the optical power meter 2 to ensure that it does not shift or loosen during the optical power measurement process. The fixing method can be vacuum adsorption, magnetic adsorption, bolt fixing, etc. The optical power meter moving platform 42 is a device that can drive the optical power meter fixing member 41 and the optical power meter 2 thereon to move in a two-dimensional plane, which is similar to the mirror moving platform 32 in the above embodiment and will not be elaborated here.

[0065] In this embodiment, the optical power meter bracket 4 includes an optical power meter fixing member 41 detachably connected to the optical power meter 2, and an optical power meter moving platform 42 movably connected to the optical power meter fixing member 41. Among them, the optical power meter fixing member 41 can ensure that the optical power meter 2 is firmly held in a predetermined position during the measurement process, avoiding position deviation caused by vibration or external interference, and ensuring the accuracy and consistency of the measurement results. The optical power meter moving platform 42 allows the optical power meter fixing member 41 and the optical power meter 2 thereon to move flexibly in a two-dimensional plane, enabling the user to easily adjust the position of the optical power meter 2 to accurately align with the reflection optical path, greatly improving the flexibility, accuracy, and operation convenience of the optical power test device.

[0066] Further, in a feasible embodiment, the optical power meter fixing member 41 includes a rotation unit 411 for rotating the optical power meter 2 so that the photosensitive surface is set such that when receiving the light conducted by the reflection optical path, the incident angle of the light is less than a preset angle.

[0067] It should be noted that the rotation unit 411 is a device for adjusting the angle of the optical power meter 2. It allows at least the adjustment of the pitch angle and yaw angle of the optical power meter 2 to change the orientation of the photosensitive surface on the detector (i.e., the test probe), ensuring that the light conducted by the reflection optical path (i.e., the reflected light) can irradiate the photosensitive surface at an ideal incident angle (less than the preset angle), as Figure 5 shown.

[0068] It is not difficult to understand that the rotation unit 411 has a locking mechanism to fix the angle after finding the best angle to prevent the angle of the optical power meter 2 from shifting due to factors such as vibration during the measurement process.

[0069] Exemplarily, the optical power meter fixing member 41 includes a rotation unit 411 for rotating the optical power meter 2 so that the photosensitive surface is set such that when receiving the light conducted by the reflection optical path, the incident angle of the light is 0 degrees (that is, the light conducted by the reflection optical path is incident on the photosensitive surface at a perpendicular angle, or it can also be described as: the light conducted by the reflection optical path is perpendicular to the photosensitive surface).

[0070] This embodiment provides the ability to finely adjust the optical power meter 2 through the rotation unit 411, ensuring that the light conducted in the reflection optical path is incident on the photosensitive surface at a vertical or nearly vertical angle, thereby maximizing the light absorption efficiency, reducing measurement errors, and ensuring the accuracy and reliability of the measurement results.

[0071] In addition, compared with the method of adjusting the angle of the optical power meter 2 by adjusting the entire optical power meter bracket 4, the rotation unit 411 significantly reduces the operation difficulty and time cost, enabling even non-professionals to quickly get started and obtain accurate measurement results.

[0072] Based on the above first embodiment, a second embodiment of the optical power measurement device of the present application is proposed.

[0073] In the second embodiment of the present application, the same or similar content as the above embodiment can be referred to the above introduction and will not be repeated hereinafter.

[0074] In this embodiment, the optical power measurement device 100 further includes a central control unit (not shown) connected to the optical power meter 2, and the central control unit is used for: Obtain the optical power measurement value corresponding to the area to be measured measured by the optical power meter 2, and the size of the reflection surface; Calculate the optical power density corresponding to the area to be measured according to the optical power measurement value and the size of the reflection surface. [[ID=X]]

[0075] Those skilled in the art know that the optical power density refers to the optical power received per unit area, usually in watts per square meter or watts per square centimeter, and is used to reflect the concentration degree of light energy in a certain area. Its calculation method is optical power divided by area.

[0076] It should be noted that the central control unit refers to an electronic device or module with data acquisition, processing, and control functions, usually composed of a processor, a memory, an input / output interface, etc., and can specifically be a microcontroller, a system-on-chip, a field-programmable gate array, etc.

[0077] In this embodiment, the central control unit is connected to the optical power meter 2, responsible for receiving measurement data, and calculating and outputting results according to a preset algorithm, and is the core component for realizing intelligent measurement.

[0078] In this embodiment, the central control unit can determine the area of the reflection surface according to the size of the reflection surface, and then divide the optical power measurement value by the area of the reflection surface to calculate the corresponding optical power density, so as to reflect the optical power distribution of the optical machine 5 to be measured in the area to be measured.

[0079] In this embodiment, by introducing a central control unit, the automatic calculation and output of the optical power density from the original optical power measurement value are realized, thereby providing more refined and valuable data, which helps to judge the light emission uniformity, focusing effect at each position of the optical machine 5 to be measured, or whether there are problems of local overbrightness / darkness.

[0080] In a feasible implementation manner, the light emitted by the optical machine 5 to be measured is monochromatic light, and the central control unit is further configured to: Obtain the reflectivity of the reflecting surface for the monochromatic light calibrated in advance, and calculate the optical power density corresponding to the area to be measured according to the optical power measurement value, the size of the reflecting surface, and the reflectivity.

[0081] As known to those skilled in the art, monochromatic light refers to an electromagnetic wave with a single wavelength or frequency, and usually refers to light within a specific wavelength range in optics. In practical applications, "monochromatic light" often refers to light with an approximately single wavelength. The reflectivity refers to the ability of the material surface to reflect the incident light, which is expressed by the ratio of the reflected light intensity to the incident light intensity, and is usually expressed in percentage (%) or decimal form.

[0082] In this embodiment, when the light emitted by the optical machine 5 to be measured is monochromatic light, the reflectivity of the reflecting surface for this type of monochromatic light can be calibrated in advance, so that in the calculation of the optical power density, the calibrated reflectivity is combined to compensate for the optical power loss caused by the non-ideal reflecting surface and improve the accuracy of the measurement result.

[0083] Exemplarily, when the optical machine 5 to be measured is a DLP 3D printing optical machine and is essentially a UV (Ultraviolet) monochromatic DLP projection optical machine, the light it emits is this type of monochromatic light, i.e., ultraviolet light (also called UV light). At this time, when selecting the reflecting mirror 1, a reflecting mirror 1 with an anti-ultraviolet film on its reflecting surface can be selected to improve the reflectivity of ultraviolet light, and the reflectivity of the reflecting surface for ultraviolet light is calibrated in advance, so that in practical applications, the loss of this part of the reflectivity is compensated to improve the accuracy of the optical power measurement.

[0084] In a feasible implementation manner, the reflecting mirror moving platform 32 is parallel to the projection screen 6, the central control unit is connected to the reflecting mirror moving platform 32, and the central control unit is further configured to: Determine the coordinates to be measured corresponding to the area to be measured, and control the reflecting mirror moving platform 32 to move the reflecting mirror fixing member 31 according to the coordinates to be measured until the reflecting mirror 1 is fixed to the area to be measured.

[0085] It can be understood that after the reflecting mirror 1 is fixed to the area to be measured, the reflecting surface is fitted and matched with the area to be measured.

[0086] It should be noted that the coordinates to be measured refer to the two-dimensional coordinates of the geometric center of the area to be measured on the projection screen 6.

[0087] In this embodiment, the geometric center of the projection screen 6 can be taken as the origin, the horizontal direction of the projection screen 6 as the X-axis, and the vertical direction of the projection screen 6 as the Y-axis to establish a plane coordinate system of the projection screen 6. Thus, when the mirror moving platform 32 is parallel to the projection screen 6, according to the measured coordinates corresponding to the area to be measured in this plane coordinate system, the mirror moving platform 32 is controlled to move the mirror fixing member 31 until the mirror 1 is fixed to the area to be measured, ensuring that the reflecting surface on the mirror 1 can just reflect the light emitted by the optical machine 5 to be measured to the area to be measured.

[0088] In a feasible embodiment, the mirror moving platform 32 is parallel to the optical power meter moving platform 42, and the central control unit is also connected to the optical power meter moving platform 42. The central control unit is further configured to: Determine the first straight-line distance between the optical machine 5 to be measured and the mirror moving platform 32, and the second straight-line distance between the mirror moving platform 32 and the optical power meter moving platform 42; Calculate the optical path angle between the reflection optical path and the mirror moving platform 32 according to the measured coordinates and the first straight-line distance; Calculate the intersection coordinates between the reflection optical path and the optical power meter moving platform 42 according to the optical path angle and the second straight-line distance; Control the optical power meter moving platform 42 to move the optical power meter fixing member 41 according to the intersection coordinates until the optical power meter 2 is fixed to the reflection optical path.

[0089] It should be noted that the first straight-line distance refers to the straight-line distance between the optical machine 5 to be measured and the mirror moving platform 32, that is, the distance between the projection lens of the optical machine 5 to be measured and the plane where the mirror moving platform 32 is located. The second straight-line distance refers to the straight-line distance between the mirror moving platform 32 and the optical power meter moving platform 42, that is, the distance between the plane where the mirror moving platform 32 is located and the plane where the optical power meter moving platform 42 is located. The first straight-line distance and the second straight-line distance can be measured by a camera device in practical applications or input by the user in advance.

[0090] It should also be noted that the optical path angle between the reflection optical path and the mirror moving platform 32 refers to the angle between the axis of the reflection optical path and the plane where the mirror moving platform 32 is located. The intersection coordinates between the reflection optical path and the optical power meter moving platform 42 refer to the coordinates of the intersection point between the axis of the reflection optical path and the plane where the optical power meter moving platform 42 is located.

[0091] In this embodiment, based on the plane coordinate system of the projection screen 6, a spatial rectangular coordinate system can be established with the optical path along which the light machine 5 to be measured emits light towards the geometric center of the projection screen 6 as the Z-axis. Thus, when the plane where the mirror moving platform 32 is located, the plane where the reflecting surface of the mirror 1 is located, and the plane where the projection screen 6 is located are parallel to each other, and the distances between these three planes are all less than a preset value, and these three planes can be regarded as the same plane, the three-dimensional coordinates corresponding to the geometric center of the reflecting surface in this spatial rectangular coordinate system can be determined according to the coordinates to be measured, and the three-dimensional coordinates corresponding to the projection lens of the light machine 5 to be measured in this spatial rectangular coordinate system can be determined according to the first linear distance. Exemplarily, if the coordinates to be measured are (x, y), then the three-dimensional coordinates corresponding to the geometric center of the reflecting surface are (x, y, 0), the first linear distance is z, and the three-dimensional coordinates corresponding to the projection lens are (0, 0, z). Thus, based on these two three-dimensional coordinates and in combination with the optical reflection principle, the optical path angle between the reflected optical path and the mirror moving platform 32 can be calculated.

[0092] Correspondingly, when the plane where the mirror moving platform 32 is located, the plane where the optical power meter moving platform 42 is located, and the plane where the photosensitive surface of the optical power meter 2 is located are parallel to each other, and the distance between the plane where the optical power meter moving platform 42 is located and the plane where the optical power meter 2 is located is less than a preset value, and these two planes can be regarded as the same plane, the Z-axis coordinate value corresponding to the plane where the optical power meter moving platform 42 is located in this spatial rectangular coordinate system can be determined according to the second linear distance, and in combination with the three-dimensional coordinates corresponding to the geometric center of the reflecting surface and the optical path angle between the reflected optical path and the mirror moving platform 32, the intersection coordinates between the reflected optical path and the optical power meter moving platform 42 can be calculated.

[0093] In this embodiment, the central control unit can calculate the incident angle of the light emitted by the light machine 5 to be measured to the position to be measured according to the coordinates to be measured and the first linear distance, thereby calculating the optical path angle between the reflected optical path and the mirror moving platform 32 through optical theorems, and in combination with the second linear distance, calculating the intersection coordinates between the reflected optical path and the optical power meter moving platform 42, and then controlling the optical power meter moving platform 42 to move the optical power meter fixing member 41 until the optical power meter 2 is fixed on the reflected optical path, realizing the movement of the optical power meter 2 to the emission optical path without manual operation by the user.

[0094] Further, in a feasible embodiment, the central control unit is also connected to the rotating unit 411, and the central control unit is further configured to: Control the rotating unit 411 to rotate the optical power meter 2 according to the optical path angle until the incident angle of the light is less than a preset angle when the photosensitive surface receives the light conducted by the reflected optical path.

[0095] Exemplarily, the central control unit is also connected to the rotating unit 411, and the central control unit is configured to: According to the optical path angle, control the rotation unit 411 to rotate the optical power meter 2 until the incident angle of the light is 0 degrees when the photosensitive surface receives the light conducted by the reflection optical path (that is, the light conducted by the reflection optical path is incident on the photosensitive surface at a perpendicular angle, or it can also be described as: the light conducted by the reflection optical path is perpendicular to the photosensitive surface).

[0096] In this embodiment, after the central control unit calculates the optical path angle between the reflection optical path and the mirror moving platform 32, it can calculate the optical path angle between the reflection optical path and the optical power meter moving platform 42 through optical principles, and then adjust the angle of the optical power meter 2 through the rotation unit 411, so that the incident angle of the light conducted by the reflection optical path is less than the preset angle when it is incident on the photosensitive surface, realizing the automatic adjustment of the angle of the optical power meter 2.

[0097] For the sake of easy understanding, as Figure 6 shown, in a specific embodiment, when the reflection surface of the mirror, the plane where the mirror moving platform is located, and the plane where the projection screen is located can be regarded as being in the same plane and parallel to the plane where the optical power meter moving platform is located, for a projection distance (that is, the distance between the projection lens of the optical machine to be measured and the plane where the projection screen is located, equivalent to the first straight-line distance) of 140 mm and a projection screen size of 144 mm * 81 mm for the optical machine to be measured, a nine-point uniformity optical power density test of the screen is carried out, and both the length and width are divided according to 1:2:2:1, and the intersection position is the nine-point position (that is, the area to be measured).

[0098] Taking the geometric center of the projection screen as the coordinate origin (0, 0), for any point (x, y) on the projection screen, the incident angle θ (that is, the optical path angle) of the corresponding light after being reflected by the reflection surface of the mirror at the plane where the optical power meter moving platform is located is:[[]]END]

[0099] where d is the photography distance.

[0100] The angular component θ X in the X direction (i.e., the yaw angle) can be calculated by the following formula:

[0101] The angular component θ Y in the Y direction (i.e., the pitch angle) can be calculated by the following formula:

[0102] Through the above method, the coordinates of the nine-point position and the angular components of the corresponding light incident angle in the X and Y directions can be calculated as shown in the following table:

[0103] During the test, the size of the reflecting surface of the mirror is 3 mm * 3 mm. The mirror is successively moved to each coordinate point to reflect light, and the optical power meter is successively moved into the propagation optical path of the reflected light (i.e., the reflected optical path), so as to adjust the angle of the optical power meter according to the angle components in the X and Y directions in the above table, making the light conducted in the reflected optical path perpendicular to the photosensitive surface (that is, the photosensitive surface is set to: when receiving the light conducted in the reflected optical path, the incident angle of the light is less than the preset angle). During the test, ensure that the spot size is smaller than the sensing surface size, that is, ensure that the reflecting surface size is smaller than the sensing surface size. Read the optical power values corresponding to each point (i.e., the optical power measurement values corresponding to the area to be measured) respectively, and divide by the reflecting surface size to obtain the optical power density at this point (i.e., the optical power density corresponding to the area to be measured).

[0104] It should be noted that the above embodiments / implementation manners are only used to assist in understanding the present application and do not constitute a limitation on the optical power measurement device of the present application. Based on this technical concept, more forms of simple transformations are within the protection scope of the present application.

[0105] The above are only some embodiments of the present application, and do not limit the patent scope of the present application accordingly. All equivalent structural transformations made under the technical concept of the present application by using the content of the specification and drawings of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. An optical power measurement device, characterized in that, The device includes a reflector and an optical power meter. The reflector includes a reflecting surface, and the optical power meter includes a photosensitive surface; The reflector is disposed in the area to be measured. When the optical machine to be measured generates a projection screen, the reflector reflects the light emitted by the optical machine to be measured to the area to be measured through the reflecting surface, and forms a reflected light path. Wherein, the area to be measured is the area in the projection screen where the optical power is to be measured; The optical power meter is disposed on the reflected light path, and is configured to receive the light conducted by the reflected light path through the photosensitive surface, and measure the optical power of the area to be measured according to the received light, so as to obtain the optical power measurement value corresponding to the area to be measured.

2. The optical power measurement device according to claim 1, wherein The photosensitive surface is configured such that when receiving the light conducted by the reflected light path, the incident angle of the light is less than a preset angle.

3. The optical power measurement device according to claim 2, characterized in that, The device further includes a reflector bracket detachably connected to the reflector, and is configured to fix the reflector to the area to be measured.

4. The optical power measurement device according to claim 3, wherein, The reflector bracket includes a reflector fixing member detachably connected to the reflector, and a reflector moving platform movably connected to the reflector fixing member; The reflector fixing member is configured to fix the reflector; The reflector moving platform is configured to move the reflector fixing member to fix the reflector to the area to be measured.

5. The optical power measurement device according to claim 4, characterized in that, The device further includes an optical power meter bracket detachably connected to the optical power meter, and the optical power meter bracket is configured to fix the optical power meter to the reflected light path.

6. The optical power measurement device according to claim 5, wherein, The optical power meter bracket includes an optical power meter fixing member detachably connected to the optical power meter, and an optical power meter moving platform movably connected to the optical power meter fixing member; The optical power meter fixing member is configured to fix the optical power meter; The optical power meter moving platform is configured to move the optical power meter fixing member to fix the optical power meter to the reflected light path.

7. The optical power measurement device according to claim 6, characterized in that, The optical power meter fixing member includes a rotating unit, and is configured to rotate the optical power meter so that the photosensitive surface is configured such that when receiving the light conducted by the reflected light path, the incident angle of the light is less than a preset angle.

8. The optical power measurement device according to claim 7, wherein The device further includes a central control unit connected to the optical power meter. The central control unit is configured to: Obtain the optical power measurement value corresponding to the area to be measured measured by the optical power meter, and the size of the reflecting surface; Calculate the optical power density corresponding to the area to be measured according to the optical power measurement value and the size of the reflecting surface.

9. The optical power measurement device according to claim 8, characterized in that, The light emitted by the optical machine to be measured is monochromatic light. The central control unit is further configured to: Obtain the reflectivity of the reflecting surface to the monochromatic light calibrated in advance, and calculate the optical power density corresponding to the area to be measured according to the optical power measurement value, the size of the reflecting surface, and the reflectivity.

10. The optical power measurement device according to claim 9, characterized in that, The reflector moving platform is parallel to the projection screen. The central control unit is connected to the reflector moving platform. The central control unit is further configured to: Determine the coordinates to be measured corresponding to the area to be measured, and control the reflector moving platform to move the reflector fixing member according to the coordinates to be measured until the reflector is fixed to the area to be measured.

11. The optical power measurement device according to claim 10, characterized in that, The mirror moving platform is parallel to the optical power meter moving platform, and the central control unit is further connected to the optical power meter moving platform. The central control unit is further configured to: Determine a first linear distance between the optical machine under test and the mirror moving platform, and a second linear distance between the mirror moving platform and the optical power meter moving platform; Calculate an optical path angle between the reflected optical path and the mirror moving platform according to the coordinate to be measured and the first linear distance; Calculate an intersection coordinate between the reflected optical path and the optical power meter moving platform according to the optical path angle and the second linear distance; Control the optical power meter moving platform to move the optical power meter fixing member according to the intersection coordinate until the optical power meter is fixed on the reflected optical path.

12. The optical power measurement device according to claim 11, characterized in that, The central control unit is further connected to the rotating unit. The central control unit is further configured to: Control the rotating unit to rotate the optical power meter according to the optical path angle until the incident angle of the light is less than a preset angle when the photosensitive surface receives the light conducted by the reflected optical path.

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