Optical power measurement apparatus, method, device and storage medium

Abstract

The application discloses an optical power measuring device, method, equipment and storage medium, relates to the technical field of optical measurement, and the optical power measuring device comprises a movable projection panel and an optical power meter. The movable projection panel is provided with a light transmission hole. The optical power meter comprises a photosensitive surface. The movable projection panel is arranged on the projection light path of a to-be-measured light machine, so that a projection picture is formed on the movable projection panel. The movable projection panel is arranged to move the light transmission hole to be aligned with a to-be-measured area of the projection picture. The photosensitive surface is arranged on the to-be-measured light path and is arranged to receive to-be-measured light rays conducted by the to-be-measured light path for optical power measurement by the optical power meter. The to-be-measured light path is a light path formed by the projection light rays corresponding to the to-be-measured area passing through the light transmission hole. The application can measure the optical power of a DLP projection light machine with a small projection picture size without customizing a small-size photosensitive surface optical power meter.

Description

Technical Field

[0001] The present application relates to the field of optical measurement technology, and in particular to an optical power measurement device, method, equipment and storage medium. Background Art

[0002] In the field of 3D printing, Digital Light Processing (DLP), with its high precision and rapid prototyping capabilities, has become a core technology in stereolithography 3D printing systems. DLP 3D printing equipment typically uses a monochrome DLP projector operating in the UV (Ultraviolet) wavelength range to precisely project a pre-set pattern onto a photosensitive resin surface, curing it layer by layer to build a 3D model. To ensure print quality and process consistency, accurately measuring and calibrating the optical power across each area of ​​the projected image is crucial, as it directly impacts the curing of the photosensitive resin and the quality of the final product.

[0003] Currently, the projection screen size of DLP projectors is relatively small, typically only a few centimeters to more than ten centimeters. However, the photosensitive surface size of standard optical power meters is relatively large. When using standard optical power meters to measure the optical power of a DLP projector's projection screen, it is difficult to accurately locate and measure the optical power of a specific area in the projection screen. To address this, one feasible approach is to customize an optical power meter with a small photosensitive surface to measure the optical power of DLP projectors with smaller projection screens, but this is costly. Summary of the Invention

[0004] The main purpose of this application is to provide an optical power measurement device, method, equipment and storage medium, aiming to solve the technical problem of high cost of customizing an optical power meter with a small photosensitive surface when measuring the optical power of a DLP projector with a smaller projection screen size.

[0005] To achieve the above-mentioned object, the present application provides an optical power measurement device, which includes a movable projection panel and an optical power meter, wherein the movable projection panel is provided with a light-through hole, and the optical power meter includes a photosensitive surface;

[0006] The movable projection panel is arranged on the projection light path of the light machine to be measured, so that a projection picture is formed on the movable projection panel;

[0007] The movable projection panel is configured to move the light hole to align with the area to be measured on the projection screen;

[0008] The photosensitive surface is arranged on the optical path to be measured, and is configured to receive the light to be measured transmitted by the optical path to be measured so that the optical power meter can measure the optical power, wherein the optical path to be measured is the optical path formed by the projection light corresponding to the area to be measured passing through the light hole.

[0009] In one embodiment, a reflective sheet is provided on the wall of the light-through hole.

[0010] In one embodiment, a filter is provided on the light-through hole, and the transmission band of the filter matches the emission band of the light machine to be measured.

[0011] In one embodiment, the light hole includes a light entrance and a light exit, the light entrance is located on the light-facing side of the movable projection panel, and the light exit is located on the backlight side of the movable projection panel;

[0012] The angle between the shortest edge connecting line between the light inlet and the light outlet and the panel normal is greater than or equal to the maximum projection oblique angle, wherein the panel normal is the normal of the movable projection panel, and the maximum projection oblique angle is the maximum angle between the projection light path and the panel normal.

[0013] In one embodiment, the area of ​​the light entrance is larger than the area of ​​the light exit, the shape of the light exit matches the shape of the area to be measured, and the absolute value of the difference between the target area ratio and the target distance ratio is less than a first preset value;

[0014] Among them, the target area ratio is the ratio of the area of ​​the light outlet to the area of ​​the area to be measured, the target distance ratio is the ratio of the light output distance to the light input distance, the light output distance is the distance between the light machine to be measured and the backlight side, and the light input distance is the distance between the light machine to be measured and the surface light side.

[0015] In one embodiment, the area of ​​the light exit is larger than that of the light entrance, the shape of the light entrance matches the shape of the area to be measured, and the absolute value of the difference between the area of ​​the light entrance and the area of ​​the area to be measured is less than a second preset value.

[0016] In one embodiment, a line connecting geometric centers of the light entrance and the light exit is parallel to a normal line of the panel.

[0017] In one embodiment, the optical power meter includes a test probe, the test probe includes the photosensitive surface, the device further includes a probe holder, the probe holder includes a fixed base and a movable base, and the movable base includes a moving part and a rotating part;

[0018] The movable member is movably connected to the fixed base, the rotating member is rotatably connected to the movable member, the test probe is detachably connected to the rotating member, the test probe moves following the movement of the movable member, and the test probe rotates following the rotation of the rotating member.

[0019] In addition, to achieve the above-mentioned purpose, the present application also provides an optical power measurement method, which is applied to the optical power measurement device as described above, wherein the device includes a movable projection panel and an optical power meter, wherein the movable projection panel is provided with a light-through hole, and the optical power meter includes a photosensitive surface, and the method includes:

[0020] The movable projection panel is arranged on the projection light path of the light machine to be measured, so that the projection light emitted by the light machine to be measured through the projection light path forms a projection picture on the movable projection panel;

[0021] Moving the movable projection panel until the light hole is aligned with the area to be measured on the projection screen, so that the projection light corresponding to the area to be measured passes through the light hole and through the movable projection panel, and forms a light path to be measured after passing through the movable projection panel;

[0022] The photosensitive surface is arranged on the optical path to be measured to receive the light to be measured transmitted by the optical path to be measured, so that the optical power meter can measure the optical power of the area to be measured based on the light to be measured and output the optical power measurement value corresponding to the area to be measured.

[0023] In addition, to achieve the above-mentioned purpose, the present application also provides an optical power measurement device, which includes: a memory, a processor, and a computer program stored on the memory and capable of running on the processor. When the computer program is executed by the processor, the steps of the optical power measurement method as described above are implemented.

[0024] In addition, to achieve the above-mentioned purpose, the present application also provides a storage medium, which is a computer-readable storage medium and stores a computer program. When the computer program is executed by a processor, the steps of the optical power measurement method as described above are implemented.

[0025] Since the projection screen size of a DLP projector is relatively small, usually only a few centimeters to more than ten centimeters, and the photosensitive surface size of a standard optical power meter 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.

[0026] Based on this, an embodiment of the present application provides an optical power measuring device, including a movable projection panel and an optical power meter, wherein a light hole is provided on the movable projection panel, and the optical power meter includes a photosensitive surface; the movable projection panel is arranged on the projection light path of the optical machine to be measured, so that a projection picture is formed on the movable projection panel; the movable projection panel is configured to move the light hole to align with the area to be measured of the projection picture; the photosensitive surface is arranged on the optical path to be measured, and is configured to receive the light to be measured transmitted by the optical path to be measured for the optical power meter to perform optical power measurement, wherein the optical path to be measured is the optical path formed by the projection light corresponding to the area to be measured passing through the light hole. The embodiment of the present application does not choose to make high-cost miniaturization improvements to the structure of the optical power meter, but instead takes a different approach. Through the light-through hole opened on the movable projection panel, the projection light corresponding to the area to be measured is "guided" to the photosensitive surface of the optical power meter, thereby accurately controlling the projection light irradiated on the photosensitive surface, ensuring that only the projection light corresponding to the area to be measured is allowed to pass through the light-through hole to the photosensitive surface of the optical power meter, thereby achieving accurate measurement of the optical power in the area to be measured.

[0027] Through this optical power measurement device, the embodiment of the present application transforms the high-cost miniaturization improvement of the optical power meter into precise guidance of the projection light by the movable projection panel, thereby achieving accurate measurement of the optical power of a specific area in a tiny projection area without changing the structure of the optical power meter. This not only effectively avoids the high cost of customizing a miniature optical power meter, but also improves the adaptability and practicality of the measurement system, thereby achieving the technical effect of reducing costs, improving measurement accuracy and operational feasibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0030] Figure 1 This is a schematic structural diagram of an optical power measurement device in an embodiment of the present application;

[0031] Figure 2 This is a schematic diagram of the imaging of the projection screen in the optical power measurement device according to an embodiment of the present application;

[0032] Figure 3This is a schematic structural diagram of a movable projection panel in an optical power measurement device according to an embodiment of the present application;

[0033] Figure 4 This is a schematic diagram of the structure of the probe bracket in the optical power measurement device according to an embodiment of the present application;

[0034] Figure 5 This is a schematic diagram of the angle adjustment of the test probe in the optical power measurement device according to an embodiment of the present application;

[0035] Figure 6 Schematic diagram of the optical power measurement method in an embodiment of the present application;

[0036] Figure 7 Schematic diagram of the device structure of the hardware operating environment involved in the optical power measurement method in the embodiment of the present application.

[0037] Description of the accompanying figures:

[0038] 100. Optical power measuring device; 1. Movable projection panel; 1A. Light side; 1B. Backlight side; 11. Light aperture; 11A. Light inlet; 11B. Light outlet; 2. Optical power meter; 21. Photosensitive surface; 3. Photometer to be measured; 4. Probe holder; 41. Fixed base; 42. Movable seat; 421. Moving part; 422. Rotating part; 5. Projection screen.

[0039] The purpose, features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0041] It should be understood that the specific embodiments described herein are merely used to explain the technical solutions of the present application and are not intended to limit the present application.

[0042] Since the projection screen size of a DLP projector is relatively small, usually only a few centimeters to more than ten centimeters, and the photosensitive surface size of a standard optical power meter 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.

[0043] In this regard, the solution of an embodiment of the present application is a light power measuring device, comprising a movable projection panel and an optical power meter, wherein a light through hole is provided on the movable projection panel, and the optical power meter comprises a photosensitive surface; the movable projection panel is arranged on the projection light path of the light machine to be measured, so that a projection picture is formed on the movable projection panel; the movable projection panel is configured to move the light through hole to align with the area to be measured of the projection picture; the photosensitive surface is arranged on the light path to be measured, and is configured to receive the light to be measured transmitted by the light path to be measured for the optical power meter to perform light power measurement, wherein the light path to be measured is the light path formed by the projection light corresponding to the area to be measured passing through the light through hole.

[0044] The embodiment of the present application does not choose to make high-cost miniaturization improvements to the structure of the optical power meter, but instead takes a different approach. Through the light-through hole opened on the movable projection panel, the projection light corresponding to the area to be measured is "guided" to the photosensitive surface of the optical power meter, thereby accurately controlling the projection light irradiated on the photosensitive surface, ensuring that only the projection light corresponding to the area to be measured is allowed to pass through the light-through hole to the photosensitive surface of the optical power meter, thereby achieving accurate measurement of the optical power in the area to be measured.

[0045] Through this optical power measurement device, the embodiment of the present application transforms the high-cost miniaturization improvement of the optical power meter into precise guidance of the projection light by the movable projection panel, thereby achieving accurate measurement of the optical power of a specific area in a tiny projection area without changing the structure of the optical power meter. This not only effectively avoids the high cost of customizing a miniature optical power meter, but also improves the adaptability and practicality of the measurement system, thereby achieving the technical effect of reducing costs, improving measurement accuracy and operational feasibility.

[0046] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0047] This embodiment of the application proposes an optical power measurement device, please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the optical power measurement device in the embodiment of the present application. Figure 2 Schematic diagram of the imaging of the projection screen in the optical power measurement device according to an embodiment of the present application.

[0048] In this embodiment, the optical power measurement device 100 includes a movable projection panel 1 and an optical power meter 2. The movable projection panel 1 is provided with a light hole 11. The optical power meter 2 includes a photosensitive surface 21.

[0049] The movable projection panel 1 is arranged on the projection light path of the light machine 3 to be measured, so that a projection picture 5 is formed on the movable projection panel 1;

[0050] The movable projection panel 1 is configured to move the light hole 11 to align with the area to be measured on the projection screen 5;

[0051] The photosensitive surface 21 is arranged on the optical path to be measured, and is configured to receive the light to be measured transmitted by the optical path to be measured for the optical power meter 2 to measure the optical power, wherein the optical path to be measured is the optical path formed by the projection light corresponding to the measured area passing through the light hole 11.

[0052] Those skilled in the art will appreciate that the optical power meter 2 is a standard instrument used to measure the optical power of incident light. It includes components such as a detector (also called a test probe), an amplifier circuit, and a display unit. Optical power refers to the rate at which light energy passes through a specific cross-section, typically measured in watts (W). The photosensitive surface 21 is the surface of the detector where the photosensitive material is distributed and responsible for receiving light. Optical power measurement involves measuring the optical power of incident light and outputting the measured optical power value.

[0053] It should be noted that, in this embodiment, the movable projection panel 1 (also called the test panel) is a projection panel that can move freely in three-dimensional space, is made of opaque material, and has at least one light-through hole 11 (also called the test hole) opened on the projection panel.

[0054] Among them, when the projection light emitted by the light machine to be measured 3 through the projection light path is irradiated on the movable projection panel 1, only the light directed toward the light hole 11 can pass through the movable projection panel 1 and form a light path after passing through the movable projection panel 1. The light directed toward other areas will be blocked by the movable projection panel 1 and form a projection picture 5 on the movable projection panel 1.

[0055] It is worth mentioning that in this embodiment, a light shielding sheet can be provided corresponding to each light hole 11 on the movable projection panel 1. When the light shielding sheet completely blocks the light hole 11, light directed toward the light hole 11 will not be able to pass through the movable projection panel 1.

[0056] It is understood that in this embodiment, the different light holes 11 on the movable projection panel 1 can have different shapes and sizes. Therefore, when faced with different optical power measurement requirements (such as a specific shape of the area to be measured), the light hole 11 of a specific shape and size can be moved to align with the area to be measured. It is also understood that when the movable projection panel 1 has multiple light holes 11, except for the light hole 11 of a specific shape and size that is moved to align with the area to be measured, the other light holes 11 can be shielded by their corresponding light shielding sheets to prevent the projection light from irradiating the other light holes 11 onto the photosensitive surface 21 and interfering with the optical power measurement of the area to be measured by the optical power meter 2.

[0057] It should also be noted that, in this embodiment, the light machine to be measured 3 refers to the DLP projector light machine that needs to perform optical power measurement, the projection optical path refers to the optical path formed by the projection light emitted by the light machine to be measured 3 when projecting the picture, the area to be measured refers to the area in the projection picture 5 where the optical power measurement is to be performed, and the light to be measured refers to the light transmitted by the optical path to be measured.

[0058] In this embodiment, when measuring the optical power of the photoelectric device 3 to be measured using the optical power measurement device 100, the movable projection panel 1 is moved into the projection optical path of the photoelectric device 3 to be measured, so that the projection light emitted by the photoelectric device 3 through the projection optical path forms a projection image 5 on the movable projection panel 1. Next, a region to be measured is determined from the projection image 5. Based on the shape and size (i.e., area) of the region to be measured, a light aperture 11 having the same or similar shape and size as the region to be measured is identified from the light apertures 11 defined in the movable projection panel 1. This light aperture 11 is then moved to align with the region to be measured, and the light shielding plate of the aligned light aperture 11 is opened, while the light shielding plates of the other light apertures 11 are closed. This allows the projection light corresponding to the region to be measured to pass through the aligned light aperture 11 and into the movable projection panel 1, forming the light to be measured. Finally, the photosensitive surface 21 of the optical power meter 2 is moved to the optical path to be measured to receive the light to be measured transmitted by the optical path to be measured, so that the optical power meter 2 measures the optical power of the area to be measured based on the light to be measured received by the photosensitive surface 21. It can be understood that performing optical power measurement on the photodetector 3 to be measured actually refers to performing optical power measurement on at least one area to be measured in the projection image 5 of the photodetector 3 to be measured.

[0059] In addition, after determining the area to be measured, this embodiment can first determine a light hole 11 with the same or similar shape as the area to be measured from the light holes 11 opened on the movable projection panel 1 based on the shape of the area to be measured, and then adjust the distance between the movable projection panel 1 and the light machine 3 to be measured, thereby changing the size of the area to be measured until the size of the area to be measured is the same or similar to the size of the light hole 11, and then move the light hole 11 to align with the area to be measured.

[0060] In one example, when the movable projection panel 1 is disposed in the projection light path of the light machine 3 to be measured, the movable projection panel 1 can be disposed to be perpendicular to the optical axis of the light machine 3 to be measured.

[0061] It should be noted that when there are multiple areas to be measured that require optical power measurement, the movable projection panel 1 must ensure that when the determined light aperture 11 is moved to align with each area to be measured, it can still block the projection light emitted by the optical device 3 to be measured to other areas, thereby preventing the projection light corresponding to other areas from leaking to the photosensitive surface 21 of the optical power meter 2. In other words, during the optical power measurement process, except for the projection light corresponding to the area to be measured, all other projection light emitted by the optical device 3 to be measured is blocked by the movable projection panel 1, or, among the other projection light emitted by the optical device 3 to be measured, all projection light that may propagate to the photosensitive surface 21 located in the optical path to be measured is blocked by the movable projection panel 1.

[0062] Since it may be necessary to perform optical power tests on areas to be tested of different sizes and / or shapes when measuring the optical power of different optical machines 3 to be tested in different scenarios, compared with the related art of directly performing high-cost miniaturized customized modifications to the optical power meter 2, this embodiment opens a light-through hole 11 with a specific shape and / or size on the movable projection panel 1. This can 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 practicality of the system. In addition, the cost of customizing the light-through hole 11 on the movable projection panel 1 is much lower than customizing more optical power meters 2 or expanding and modifying the structure of the optical power meter 2.

[0063] This embodiment does not choose to make high-cost miniaturization improvements on the structure of the optical power meter 2, but takes a different approach. Through the light hole 11 opened on the movable projection panel 1, the projection light corresponding to the area to be measured is "guided" to the photosensitive surface 21 of the optical power meter 2, thereby accurately controlling the projection light irradiated on the photosensitive surface 21, ensuring that only the projection light corresponding to the area to be measured is allowed to pass through the light hole 11 to the photosensitive surface 21 of the optical power meter 2, thereby realizing accurate measurement of the optical power in the area to be measured.

[0064] Through the optical power measurement device 100, this embodiment transforms the high-cost miniaturization improvement of the optical power meter 2 into precise guidance of the projection light by the movable projection panel 1, thereby achieving accurate measurement of the optical power of a specific area in a small projection area without changing the structure of the optical power meter 2. This not only effectively avoids the high cost of customizing the miniature optical power meter 2, but also improves the adaptability and practicality of the measurement system, thereby achieving the technical effect of reducing costs, improving measurement accuracy and operational feasibility.

[0065] In a feasible implementation manner, a reflective sheet (not shown) is provided on the hole wall (not shown) of the light-through hole 11 .

[0066] It should be noted that reflective sheeting is a coating or patch of light material with high reflectivity.

[0067] Because the movable projection panel 1 has a certain physical thickness (i.e., the light aperture 11 is a channel of a certain length), and the projection light projected by the optical device 3 onto the test area on the projection screen 5 does not propagate completely perpendicular to the surface of the movable projection panel 1 (i.e., it has an incident angle or oblique angle). Especially when the test area is close to the edge of the projection screen 5, the corresponding incident angle of the projection light may be more significant. For a light aperture 11 of a certain thickness, if its walls are not specially treated (e.g., a low-reflectivity surface of the natural material), some light incident at a large oblique angle and striking the wall may be lost due to physical obstruction by the wall (i.e., light is blocked at the entrance of the light aperture 11 or the inner wall of the channel, preventing it from continuing to propagate in its original direction to the exit). These lost light rays should have originally belonged to the test area, and their absence will cause subsequent optical power measurements to be lower than the actual optical power projected by the test area, thereby introducing measurement errors.

[0068] This embodiment effectively addresses the light loss problem caused by panel thickness and light angle by providing a reflective sheet with high reflectivity on the wall of the light hole 11. When light incident at an oblique angle strikes the reflective sheet on the wall of the light hole 11, the reflective sheet efficiently reflects the light that would otherwise be blocked, allowing the reflected light to change its propagation path while still traveling along the direction of effective transmission within the light hole 11, ultimately exiting smoothly through the exit of the light hole 11. This significantly reduces light energy loss caused by physical obstruction by the wall, ensuring that more (or even nearly all) of the projected light belonging to the area to be measured ultimately effectively passes through the light hole 11 and is "guided" to the photosensitive surface 21 of the optical power meter 2, thereby improving the accuracy of optical power measurement.

[0069] It is worth mentioning that the reflection band of the reflective sheet (i.e. the band in which the light reflected by the reflective sheet is concentrated) matches the emission band of the light machine 3 to be measured (i.e. the band corresponding to the projection light emitted by the light machine 3 to be measured), thereby ensuring that the reflective sheet can effectively reflect the projection light emitted by the light machine 3 to be measured, while avoiding reflecting the projection light that does not belong to the projection light emitted by the light machine 3 to be measured, so as to further improve the accuracy of the optical power measurement.

[0070] In a feasible implementation, a filter (not shown) is provided on the light hole 11 , and the transmission band of the filter matches the emission band of the light machine 3 to be measured.

[0071] It should be noted that a filter is an optical component with specific spectral selectivity, typically made of coated glass or optical thin film materials. Its core function is to allow light within a specific wavelength range (i.e., the transmission band) to pass through, while attenuating or blocking light in other bands.

[0072] During the optical power measurement process, ambient light (such as indoor lighting, ambient stray light) and other non-target light sources (such as light emitted by other devices) may accidentally reach the photosensitive surface 21 of the optical power meter 2 through reflection, scattering, etc. These non-target lights are collectively referred to as background light or stray light. It is understandable that the wavelength (i.e., color) of these background lights or stray lights is usually different from the projection light emitted by the optical machine 3 to be measured. If they are not suppressed, then when these stray lights are irradiated on the photosensitive surface 21, the energy they carry will also be detected by the optical power meter 2 and added to the final measurement result. This will cause the value displayed or output by the optical power meter 2 to be higher than the actual optical power of the actual projection light in the area to be measured, thereby introducing a significant positive deviation error, affecting the accuracy and reliability of the measurement.

[0073] This embodiment can effectively filter out background light or stray light by setting a filter whose transmission band matches the emission band of the light machine 3 to be measured on the light hole 11, ensuring that only the projection light emitted by the light machine 3 to be measured can pass through the light hole 11, thereby effectively isolating the interference of ambient light and ensuring that the optical power measurement result can more truly and accurately reflect the optical power value of the projection light itself corresponding to the area to be measured.

[0074] For example, when the optical machine 3 to be measured is a DLP 3D printing optical machine, and is actually a UV (Ultraviolet) monochrome DLP projector optical machine, the light it emits is monochromatic light such as ultraviolet light (also called ultraviolet light). At this time, a filter with a light transmission band corresponding to the ultraviolet light can be set in the light hole 11 to ensure that only ultraviolet light can pass through the light hole 11, and the transmittance of the filter to ultraviolet light is pre-calibrated to compensate for the loss in the transmission process in actual applications and improve the accuracy of optical power measurement.

[0075] In one possible implementation, Figure 3 As shown, the light hole 11 includes a light entrance 11A and a light exit 11B. The light entrance 11A is located on the light-facing side 1A of the movable projection panel 1, and the light exit 11B is located on the backlight side 1B of the movable projection panel 1.

[0076] The angle between the shortest edge connecting line between the light inlet 11A and the light outlet 11B and the panel normal is greater than or equal to the maximum projection oblique angle, where the panel normal is the normal of the movable projection panel 1, and the maximum projection oblique angle is the maximum angle between the projection light path and the panel normal.

[0077] It should be noted that the light-facing side 1A refers to the side of the movable projection panel 1 facing the light machine 3 to be measured, and the backlight side 1B refers to the side of the movable projection panel 1 facing away from the light machine 3 to be measured. The light inlet 11A refers to the opening of the light aperture 11 on the light-facing side 1A for receiving incident light projected from the measured area, while the light inlet 11A refers to the opening of the light aperture 11 on the backlight side 1B for deflecting light from the light inlet 11A. The maximum projection oblique angle θ_max refers to the maximum angle between all light rays in the projection light path emitted by the light machine 3 to be measured and the panel normal.

[0078] In this embodiment, the shortest edge line refers to the shortest line segment among all line segments connecting the edge points of light inlet 11A (i.e., points on the edge of light inlet 11A) and light outlet 11B (i.e., points on the edge of light outlet 11B) within the internal structure of light aperture 11. This line represents the spatial orientation of the sidewall (i.e., inner wall) of light aperture 11 in a specific direction.

[0079] In this embodiment, the angle α between the shortest edge line and the panel normal is greater than or equal to the maximum projection oblique angle θ_max. Such a design can completely solve the inherent problem of light being physically blocked by the hole wall due to the panel thickness and the light oblique angle θ.

[0080] Specifically, when projection light enters light inlet 11A at an oblique angle (θ ≤ θ_max), due to the depth of light aperture 11 (determined by the panel thickness), if its sidewalls were perpendicular to the panel (i.e., the aperture is a straight cylinder with α = 0°), the light would need to "turn" to reach light outlet 11B, which is impossible. This would inevitably result in the oblique light hitting the center of the aperture wall and being blocked or absorbed. This embodiment ensures that the interior space (sidewall direction) of light aperture 11 expands along the expected natural direction of light travel by ensuring that the shortest connecting line inclination (α) is greater than the maximum light oblique angle (θ_max). This is equivalent to constructing a "light path channel" that allows light to pass through in a straight line along its incident direction, so that all light with an incident angle ranging from 0° to θ_max (especially the edge light with the maximum oblique angle θ_max) can pass through the entire length of the light hole 11 directly and unimpeded in a straight line without changing direction (without reflection or refraction) after entering from the light inlet 11A, and be emitted from the light outlet 11B, thereby directly and physically eliminating the possibility of light being blocked by the hole wall due to the thickness of the panel and the oblique angle of the light.

[0081] It is not difficult to understand that eliminating physical obstructions means that all light energy projected from the area to be measured (regardless of the incident angle) can pass through the light hole 11 without loss and be irradiated onto the photosensitive surface 21 of the optical power meter 2, thereby completely solving the systematic error of low optical power measurement values ​​(negative deviation) caused by light loss.

[0082] This embodiment achieves a "zero reflection, zero refraction" direct-through effect by optimizing the geometric structure of the light-through hole 11, eliminating the need to rely on reflections from the hole wall to "rescue" blocked light (as in previous reflective sheeting solutions). This simplifies the system and avoids potential problems associated with reflections, such as scattering, uniformity changes, and efficiency losses.

[0083] It is worth mentioning that in this embodiment, the light inlet 11A and the light outlet 11B must be one large and one small, and when light enters vertically from the smaller opening (that is, the incident angle is 0°), the light can all be emitted vertically from the larger opening, that is, when viewed from a direction perpendicular to the projection movable panel, the smaller opening is located on the light inlet side, and the larger opening is located on the light outlet side.

[0084] In a first feasible implementation, the area of ​​the light inlet 11A is larger than the area of ​​the light outlet 11B, the shape of the light outlet 11B matches the shape of the area to be measured, and the absolute value of the difference between the target area ratio and the target distance ratio is less than a first preset value;

[0085] Among them, the target area ratio is the ratio of the area of ​​the light outlet 11B to the area of ​​the area to be measured, the target distance ratio is the ratio of the light output distance to the light input distance, the light output distance is the distance between the light machine to be measured 3 and the backlight side 1B, and the light input distance is the distance between the light machine to be measured 3 and the front light side 1A.

[0086] It should be noted that matching the shape of the light outlet 11B with the shape of the area to be measured means that the shape of the light outlet 11B is identical to or similar to the shape of the area to be measured. The first preset value is a pre-set judgment standard used to preliminarily determine whether the light hole 11 and the area to be measured are aligned. When the absolute value of the difference between the target area ratio and the target distance ratio is less than the first preset value, the light hole 11 and the area to be measured are considered to be aligned in terms of area size.

[0087] Since the movable projection panel 1 has thickness, when the projection light corresponding to the area to be measured on the front light side 1A propagates through the light hole 11 to the backlight side 1B, it is equivalent to the propagation distance increasing by the thickness of the panel. According to the law of geometric optical imaging, after the light propagates from the front light side 1A to the backlight side 1B, its imaging area will be proportionally enlarged due to the increase in the propagation distance.

[0088] To ensure that the light energy in the area to be measured passes through the light aperture 11 intact, it is necessary to resolve the conflict between the natural diffusion of the light spot and the physical size of the light aperture 11. If the area of ​​the light outlet 11B is simply set to be equal to the area to be measured, some light will be blocked by the aperture wall due to exceeding the range of the light outlet 11B. Therefore, when aligning the light aperture 11 with the area to be measured, this embodiment needs to ensure that the area of ​​the light outlet 11B matches the imaging area of ​​the projection light corresponding to the area to be measured on the backlight side 1B. In other words, it is necessary to ensure that the absolute value of the difference between the target area ratio and the target distance ratio is less than a first preset value, thereby ensuring that the projection light corresponding to the area to be measured can pass through the light aperture 11 intact (i.e., it is not blocked by the aperture wall 11).

[0089] It is easy to understand that in this embodiment, when the light hole 11 is moved to align with the area to be measured, it is also necessary to ensure that the position of the light outlet 11B matches the imaging position of the projection light corresponding to the area to be measured on the backlight side 1B.

[0090] In a second feasible implementation, the area of ​​the light outlet 11B is larger than the area of ​​the light entrance 11A, the shape of the light entrance 11A matches the shape of the area to be measured, and the absolute value of the difference between the area of ​​the light entrance 11A and the area of ​​the area to be measured is less than a second preset value.

[0091] In this embodiment, light inlet 11A is smaller than light outlet. Therefore, simply ensuring that the shape, area, and position of light inlet 11A match the area to be measured ensures that light hole 11 is aligned with the area to be measured, and that the projection light corresponding to the area to be measured passes through light hole 11 without loss. Compared to the first feasible implementation, the actual operation of this implementation is simpler and more intuitive, and does not require excessive and complex calculations.

[0092] In a feasible implementation manner, a line connecting the geometric centers of the light entrance 11A and the light exit 11B is parallel to the normal line of the panel.

[0093] It should be noted that the geometric center line refers to the line connecting the geometric center of the light inlet 11A and the geometric center of the light outlet 11B.

[0094] In this embodiment, the geometric center line is parallel to the panel normal, so when the light inlet 11A and the light outlet 11B have the same shape, the light hole 11 can be processed more easily. For example, when the light inlet 11A and the light outlet 11B are both circular, the shape of the light hole 11 is a right frustum, which is much less difficult to process than an oblique frustum whose geometric center line is parallel to the panel normal.

[0095] This embodiment can reduce the difficulty of processing the light-through hole 11 , thereby reducing the hardware cost of the optical power measurement device 100 .

[0096] In one possible implementation, Figure 4 As shown, the optical power meter 2 includes a test probe (not shown), the test probe includes a photosensitive surface 21, and the optical power measurement device 100 also includes a probe holder 4, the probe holder 4 includes a fixed base 41 and a movable base 42, and the movable base 42 includes a moving part 421 and a rotating part 422;

[0097] The moving part 421 is movably connected to the fixed base 41 , the rotating part 422 is rotatably connected to the moving part 421 , and the test probe is detachably connected to the rotating part 422 . The test probe moves with the movement of the moving part 421 and rotates with the rotation of the rotating part 422 .

[0098] It should be noted that the optical power measurement axis also includes a probe holder 4, which consists of a fixed base 41 and a movable base 42. The fixed base 41 is responsible for providing stable support, and the movable base 42 is movably connected to the fixed base 41 via a sliding guide, hinge shaft, or universal adjustment mechanism, thereby driving the test probe to achieve translation in at least one of the three directions: horizontal, vertical, and vertical, and rotation about at least one of the three Euler angles: pitch, roll, and yaw.

[0099] Specifically, the movable base 42 includes a moving member 421 and a rotating member 422. The moving member 421 is used to achieve translation of the test probe in at least one direction, thereby fixing the photosensitive surface 21 of the test probe to the optical path to be measured. The rotating member 422 is used to achieve rotation of the test probe in at least one Euler angle, thereby changing the incident angle of the light to be measured (also called transmitted light) on the photosensitive surface 21, ensuring that the light to be measured is irradiated on the photosensitive surface 21 at a vertical or nearly vertical angle, such as Figure 5 shown.

[0100] Those skilled in the art will appreciate that the photosensitive surface 21 of the optical power meter 2 responds differently to light at different incident angles. Generally speaking, when light is incident at a vertical angle (i.e., 0 degrees), the photosensitive material on the photosensitive surface 21 absorbs photons most efficiently and converts them into electrical signals. As the angle of incidence deviates from the normal to the photosensitive surface 21, the effective absorption area of ​​the photosensitive material decreases relative to the actual area of ​​the incident light, resulting in a decrease in response efficiency and, in turn, a decrease in the optical power value measured by the optical power meter 2.

[0101] Exemplarily, the rotating member 422 can set the photosensitive surface 21 so that when receiving the light to be measured transmitted by the light path to be measured, the incident angle of the light to be measured is smaller than a preset angle.

[0102] The preset angle is a pre-set angle used to ensure that the light to be measured transmitted by the light path to be measured enters the photosensitive surface 21 at a vertical or nearly vertical angle.

[0103] Through the rotating part 422, this embodiment can set the photosensitive surface 21 so that when receiving the light to be measured transmitted by the light path to be measured, the incident angle of the light to be measured is less than the preset angle, so that the light to be measured enters the photosensitive surface 21 at a vertical or nearly vertical 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, thereby improving the accuracy of the optical power measurement, and ensuring the accuracy of the optical power measurement results.

[0104] It should be noted that the above embodiments / implementations 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. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0105] In addition, this embodiment of the application also provides a method for measuring optical power, please refer to Figure 6 , Figure 6 Schematic diagram of the optical power measurement method in an embodiment of the present application.

[0106] In this embodiment, for the same or similar contents as those in the above embodiments, please refer to the above introduction and will not be repeated hereafter.

[0107] In this embodiment, the optical power measurement method is applied to the optical power measurement device described above. The device includes a movable projection panel and an optical power meter. The movable projection panel is provided with a light hole. The optical power meter includes a photosensitive surface. The optical power measurement method may include steps S100 to S300:

[0108] Step S100, placing a movable projection panel on a projection light path of a light machine to be measured, so that the projection light emitted by the light machine to be measured through the projection light path forms a projection image on the movable projection panel;

[0109] Step S200, moving the movable projection panel until the light hole is aligned with the area to be measured on the projection screen, so that the projection light corresponding to the area to be measured passes through the light hole and the movable projection panel, and forms a light path to be measured after passing through the movable projection panel;

[0110] In step S300 , a photosensitive surface is placed on a light path to be measured to receive the light to be measured transmitted by the light path to be measured, so that the optical power meter measures the optical power of the area to be measured based on the light to be measured and outputs the optical power measurement value corresponding to the area to be measured.

[0111] The optical power measurement method proposed in this embodiment and the optical power measurement device proposed in the above embodiment belong to the same technical concept. The technical details not fully described in this embodiment can be found in the above embodiment. The beneficial effects of this embodiment are the same as those of the optical power measurement device proposed in the above embodiment. It can solve the technical problem of the 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 smaller projection screen size in the related technology. It will not be elaborated here.

[0112] In addition, please refer to Figure 7 , Figure 7 Schematic diagram of the device structure of the hardware operating environment involved in the optical power measurement method in the embodiment of the present application.

[0113] The present application also provides an optical power measurement device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can perform the steps of the optical power measurement method in the above-mentioned embodiment.

[0114] Reference below Figure 7 , which shows a schematic structural diagram of an optical power measurement device suitable for implementing the embodiment of the present application. Figure 7 The optical power measurement device shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0115] like Figure 7As shown, the optical power measurement device may include a processing device 1001 (e.g., a central processing unit, graphics processing unit, etc.), which can perform various appropriate actions and processes based on programs stored in a read-only memory 1002 or programs loaded from a storage device 1003 into a random access memory 1004. The random access memory 1004 also stores various programs and data required for the operation of the optical power measurement device. The processing device 1001, the read-only memory 1002, and the random access memory 1004 are interconnected via a bus 1005. An input / output interface 1006 is also connected to the bus. Typically, the following systems may be connected to the input / output interface 1006: an input device 1007 including, for example, a touch screen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; a storage device 1003 including, for example, a magnetic tape or hard disk; and a communication device 1009. The communication device 1009 can allow the optical power measurement device to communicate with other devices wirelessly or wired to exchange data. Although the figure shows an optical power measurement device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or provided instead.

[0116] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device 1003, or installed from a read-only memory 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are performed.

[0117] The optical power measurement device provided in this application, utilizing the optical power measurement method described in the aforementioned embodiments, can address the high cost of customizing optical power meters with small photosensitive surfaces when measuring the optical power of DLP projectors with smaller projection screens. Compared to the prior art, the optical power measurement device provided in this application offers the same beneficial effects as the optical power measurement method described in the aforementioned embodiments. Other technical features of the optical power measurement device are the same as those disclosed in the aforementioned embodiments and are not further detailed here.

[0118] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0119] The above are merely specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the above claims.

[0120] In addition, an embodiment of the present application further provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the optical power measurement method in the above embodiment.

[0121] The computer program product provided in this application can address the high cost of customizing optical power meters with small photosensitive surfaces when measuring optical power for DLP projectors with smaller projection screens. Compared to the prior art, the computer program product provided in this embodiment offers the same beneficial effects as the optical power measurement method provided in the aforementioned embodiment, and will not be further elaborated upon here.

[0122] The above description is only part of the embodiments of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application 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 movable projection panel and an optical power meter, wherein the movable projection panel is provided with a light-through hole, and the optical power meter includes a photosensitive surface; The movable projection panel is arranged on the projection light path of the light machine to be measured, so that a projection picture is formed on the movable projection panel; The movable projection panel is configured to move the light hole to align with the area to be measured on the projection screen; The photosensitive surface is provided on the optical path to be measured, and is configured to receive the light to be measured transmitted by the optical path to be measured so as to provide the optical power meter with optical power measurement, wherein the optical path to be measured is the optical path formed by the projection light corresponding to the area to be measured passing through the light hole; The light hole includes a light entrance and a light exit, the light entrance is located on the light-facing side of the movable projection panel, and the light exit is located on the backlight side of the movable projection panel; The angle between the shortest edge connecting line between the light inlet and the light outlet and the panel normal is greater than or equal to the maximum projection oblique angle, wherein the panel normal is the normal of the movable projection panel, and the maximum projection oblique angle is the maximum angle between the projection light path and the panel normal.

2. The optical power measurement device according to claim 1, wherein: A reflective sheet is provided on the hole wall of the light-through hole.

3. The optical power measurement device according to claim 1, wherein: A filter is provided on the light-through hole, and the transmission band of the filter matches the emission band of the light machine to be measured.

4. The optical power measurement device according to claim 1, wherein: The area of ​​the light entrance is larger than the area of ​​the light exit, the shape of the light exit matches the shape of the area to be measured, and the absolute value of the difference between the target area ratio and the target distance ratio is less than a first preset value; Among them, the target area ratio is the ratio of the area of ​​the light outlet to the area of ​​the area to be measured, the target distance ratio is the ratio of the light output distance to the light input distance, the light output distance is the distance between the light machine to be measured and the backlight side, and the light input distance is the distance between the light machine to be measured and the surface light side.

5. The optical power measurement device according to claim 1, wherein: The area of ​​the light exit is larger than that of the light entrance, the shape of the light entrance matches the shape of the area to be measured, and the absolute value of the difference between the area of ​​the light entrance and the area of ​​the area to be measured is smaller than a second preset value.

6. The optical power measuring device according to claim 1, 4 or 5, characterized in that: A line connecting the geometric centers of the light entrance and the light exit is parallel to the normal line of the panel.

7. The optical power measurement device according to claim 1, wherein: The optical power meter includes a test probe, the test probe includes the photosensitive surface, the device also includes a probe bracket, the probe bracket includes a fixed base and a movable base, and the movable base includes a moving part and a rotating part; The movable member is movably connected to the fixed base, the rotating member is rotatably connected to the movable member, the test probe is detachably connected to the rotating member, the test probe moves following the movement of the movable member, and the test probe rotates following the rotation of the rotating member.

8. A method for measuring optical power, characterized in that: The method is applied to an optical power measurement device according to any one of claims 1 to 7, wherein the device comprises a movable projection panel and an optical power meter, wherein the movable projection panel is provided with a light-through hole, and the optical power meter comprises a photosensitive surface. The method comprises: The movable projection panel is arranged on the projection light path of the light machine to be measured, so that the projection light emitted by the light machine to be measured through the projection light path forms a projection picture on the movable projection panel; Moving the movable projection panel until the light hole is aligned with the area to be measured on the projection screen, so that the projection light corresponding to the area to be measured passes through the light hole and through the movable projection panel, and forms a light path to be measured after passing through the movable projection panel; The photosensitive surface is arranged on the optical path to be measured to receive the light to be measured transmitted by the optical path to be measured, so that the optical power meter can measure the optical power of the area to be measured based on the light to be measured and output the optical power measurement value corresponding to the area to be measured; The light hole includes a light entrance and a light exit, the light entrance is located on the light-facing side of the movable projection panel, and the light exit is located on the backlight side of the movable projection panel; The angle between the shortest edge connecting line between the light inlet and the light outlet and the panel normal is greater than or equal to the maximum projection oblique angle, wherein the panel normal is the normal of the movable projection panel, and the maximum projection oblique angle is the maximum angle between the projection light path and the panel normal.

9. An optical power measurement device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and operable on the processor, wherein when the computer program is executed by the processor, the steps of the optical power measurement method according to claim 8 are implemented.

10. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the optical power measurement method according to claim 8 are implemented.

Images