Industrial camera-based testing equipment for large-sized luminaires and its use method

Abstract

The present invention discloses a test device for large-sized luminaires based on an industrial camera and a method for using the same. The test device includes: a luminaire to be tested, a programmable power supply, a host computer, a light transmission control module, an industrial camera, and a reflector. The programmable power supply is connected to the luminaire, the host computer is connected to the programmable power supply, the light transmission control module is connected to the host computer, the light transmission control module is used to change the light transmission area of the light beam emitted by the luminaire, the industrial camera is connected to the host computer, the industrial camera is connected to the programmable power supply, and the reflector is located directly in front of the luminaire to reflect the light of the luminaire. The present invention utilizes the light transmission control module to divide the light beam emitted by the luminaire into multiple blocks, utilizes the reflector and the industrial camera to perform illuminance tests on the light of different blocks, and then linearly superimposes the multiple illuminance values to obtain the final regulatory illuminance value. In this way, optical testing of luminaires can be achieved on small test equipment, thereby improving the space utilization rate of the site.

Description

Technical Field

[0001] The present invention relates to the technical field of lamp detection, and in particular to a testing device for large-sized luminous lamps based on an industrial camera and a method for using the same. Background Art

[0002] When driving at night, the optical performance of headlights significantly impacts driver safety. For example, insufficient lighting can impair vision, while excessive brightness can dazzle oncoming drivers, all of which can easily lead to accidents. Therefore, it is essential to test the optical performance of headlights before they leave the factory.

[0003] Currently, regulations require a test distance of 25m or 3.162m for most automotive headlights. For example, for high-beam testing, the typical test distance is 25m. This ensures a comprehensive high-beam inspection. If the distance is too close, some of the high-beam light may not be detected, resulting in significant errors in the test results. However, this testing method requires a much larger test area.

[0004] Therefore, for the testing of lamps with large luminous sizes, how to shorten the testing distance while ensuring the testing accuracy has become a current research hotspot. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the technical issue of the excessively large testing area for large-sized luminaires. This invention provides a large-sized luminaire testing device based on an industrial camera and a method for using the device. This device can test the optical performance of large-sized luminaires using a compact test device and improve the accuracy of the test results.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a test device for large-sized luminaires based on an industrial camera, comprising:

[0007] The lamp to be tested, and

[0008] a programmable power supply connected to the lamp;

[0009] A host computer connected to the programmable power supply;

[0010] A light transmission control module, connected to the host computer, for changing the light transmission area of the light beam emitted by the lamp;

[0011] An industrial camera, the industrial camera being connected to the host computer and the industrial camera being connected to the programmable power supply;

[0012] A reflector is located in front of the lamp and is used to reflect the light of the lamp.

[0013] In this way, the optical performance of lamps can be tested on small equipment, and the accuracy of the test results can be guaranteed.

[0014] Furthermore, the light control module includes:

[0015] A two-dimensional moving mechanism connected to the host computer;

[0016] A light shielding plate is connected to the two-dimensional moving mechanism, the light shielding plate is located in front of the lamp, and a light hole is provided on the light shielding plate.

[0017] Furthermore, assuming that the length and width of the light hole are x0 and y0 respectively, the moving distance of the light shielding plate each time is x0, y0, an integer multiple of x0 or an integer multiple of y0.

[0018] Furthermore, the final regulatory illuminance of the lamp is: ,in, represents the final regulatory illuminance, ~ Indicates the illuminance value of different areas of the light beam emitted by the lamp. ~ Indicates the weights of different illumination values.

[0019] Furthermore, the illumination value ~ The expression is:

[0020]

[0021] in, ~ Indicates the grayscale values of different areas of the light beam emitted by the lamp captured by the industrial camera. ~ and ~ is a constant term.

[0022] Furthermore, a high diffuse reflection coating is provided on a surface of the reflective plate close to the lamp.

[0023] Furthermore, the reflector is a curved plate that is concave in a direction away from the lamp.

[0024] Furthermore, it also includes: a display alarm module, which is connected to the host computer.

[0025] The present invention provides a method for using the industrial camera-based large-size luminaire testing device, comprising the following steps:

[0026] S1. Setting the operating parameters of a programmable power supply through a host computer, and lighting the lamp to be tested through the programmable power supply;

[0027] S2, controlling the light transmission control module by the host computer to change the light transmission area of the light beam emitted by the lamp;

[0028] S3: After the different light-transmitting areas of the light beam emitted by the lamp are irradiated on the reflective plate, they are captured by the industrial camera to obtain multiple grayscale values. ;

[0029] S4, the host computer processes multiple grayscale values After conversion and processing, the final regulatory illuminance of the lamp is obtained.

[0030] Furthermore, it is characterized by further comprising:

[0031] S5. The host computer determines whether the final legal illumination is qualified and sends the determination result to the display and alarm module for display and alarm.

[0032] The beneficial effect of the present invention is that the present invention uses a light transmission control module to divide the light beam emitted by the lamp into multiple blocks, uses a reflector and an industrial camera to perform illuminance tests on the light of different blocks, and then linearly superimposes the multiple illuminance values to obtain the final regulatory illuminance value. In this way, it is possible to perform optical testing on lamps on small test equipment, thereby improving the space utilization rate of the site. Moreover, compared with the existing solution of using lenses for detection, the present invention eliminates the arrangement of a dark box, a lens, and an ideal diffuse reflection coating layer, and has a simpler structure, avoids the distortion caused by the lens, has high measurement accuracy, and is more economical. After being aligned with a standard lamp, the illuminance results of all points of the lamp can be quickly and accurately obtained. In addition, the present invention can also test various types of lamps without changing the hardware, which facilitates the universalization of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below with reference to the accompanying drawings and examples.

[0034] Figure 1 It is a structural schematic diagram of the testing equipment of the present invention.

[0035] Figure 2 Schematic diagram of the reflector of the present invention.

[0036] Figure 3 It is a schematic diagram of the movement process of the sunshade of the present invention.

[0037] Figure 4 Schematic diagram of test points on the reflector of the present invention.

[0038] Figure 5 It is a block diagram of the display alarm module of the present invention.

[0039] Figure 6 It is a schematic diagram of the partition test of the present invention.

[0040] Figure 7 is a flow chart of a method of using the present invention.

[0041] Figure 8 is a schematic diagram of a test embodiment of the present invention.

[0042] In the figure, 1. lamp; 2. programmable power supply; 3. host computer; 4. light control module; 5. industrial camera; 6. reflector; 7. display alarm module; 8. housing; 41. two-dimensional moving mechanism; 42. sunshade; 43. light hole; 71. display; 72. LED indicator; 73. sound alarm. DETAILED DESCRIPTION

[0043] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0045] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0046] like Figures 1 to 6As shown, the testing equipment for large-sized luminaires based on industrial cameras of the present invention includes: a luminaire to be tested 1, a programmable power supply 2, a host computer 3, a light transmission control module 4, an industrial camera 5 and a reflector 6. The programmable power supply 2 is connected to the luminaire 1, the host computer 3 is connected to the programmable power supply 2, the light transmission control module 4 is connected to the host computer 3, the light transmission control module 4 is used to change the light transmission area of the light beam emitted by the luminaire 1, the industrial camera 5 is connected to the host computer 3, and the reflector 6 is located directly in front of the luminaire 1 for reflecting the light of the luminaire 1.

[0047] The testing equipment also includes a housing 8, within which a programmable power supply 2, a host computer 3, and a reflector 6 are mounted. The programmable power supply 2 is used to power the luminaire 1 and the industrial camera 5, and the host computer 3 can set the operating parameters of the programmable power supply 2. The reflector 6 is located directly in front of the luminaire 1, with the optical axis of the luminaire 1 passing through the center of the reflector 6. The reflector 6 reflects the light emitted by the luminaire 1 for reception by the industrial camera 5. The industrial camera 5, for example, is a color camera that can be calibrated to detect the color coordinates of the light emitted by the luminaire 1. For example, multiple industrial cameras 5 can be used, and through image matching and image stitching, multiple cameras can detect a wider range of luminaire angles. The industrial camera 5 is located above the luminaire 1, with the incident optical axis of the industrial camera 5 passing through the center of the reflector 6. The light control module 4 can change the position at which the light beam from the luminaire 1 impinges on the reflector 6, enabling zoned illumination measurement of the luminaire 1. This reduces the testing distance of the luminaire 1, enabling performance testing of large luminaires using smaller testing equipment.

[0048] Specifically, the light control module 4 includes: a two-dimensional moving mechanism 41 and a light shielding plate 42. The two-dimensional moving mechanism 41 is connected to the host computer 3, and the light shielding plate 42 is connected to the two-dimensional moving mechanism 41. The light shielding plate 42 is located in front of the lamp 1, and a light hole 43 is provided on the light shielding plate 42. For example, the two-dimensional moving mechanism 41 is a two-dimensional motor platform that can drive the light shielding plate 42 to move on the xy plane. When the light shielding plate 42 moves, the position of the light hole 43 will also change. The light hole 43 allows the light of the lamp 1 to pass through, and the rest of the light shielding plate 42 is made of opaque material and light cannot pass through. In other words, when the light shielding plate 42 moves, the light that can pass through the light hole 43 of the lamp 1 can be changed to achieve zoned measurement of the illumination of the lamp 1. The shape of the light hole 43 can be a rectangular hole, a circular hole, etc. Taking a rectangular aperture as an example, let's assume the length and width of light aperture 43 are x0 and y0, respectively. The distance that the light shield 42 moves each time is x0, y0, an integer multiple of x0, or an integer multiple of y0. For example, the dimensions of light aperture 43 are 3 cm x 3 cm, and the movement positions of light aperture 43 are set to P1 to P9, arranged in a 3 x 3 array. That is, light aperture 43 can be moved sequentially from P1 to P9, with the displacement of light shield 42 each time being equal to x0, y0, an integer multiple of x0, or an integer multiple of y0. This ensures that light apertures 43 do not overlap during multiple measurements. If light apertures 43 overlap during each test, it indicates that the light emitted by luminaire 1 has been measured repeatedly, and the final test result will not match the actual light emission of luminaire 1. Achieving non-overlapping light apertures 43 ensures that the sum of the measurement results matches the actual state of luminaire 1, guaranteeing the accuracy of the test results.

[0049] For example, the final regulatory illuminance of luminaire 1 is: ,in, represents the final regulatory illuminance, ~ Indicates the illuminance value of different areas of the light beam emitted by the lamp. ~ Indicates the weight of different illuminance values. The weight value is related to the distance between the position of the light beam of the lamp 1 on the reflector 6 and the regulatory test point. ~ The expression is:

[0050]

[0051] in, ~ Indicates the grayscale values of different areas of the light beam emitted by the lamp captured by the industrial camera 5, ~ and ~ is a constant term. In other words, after a portion of the light beam emitted by lamp 1 passes through light hole 43, it illuminates a certain area on reflector 6 and is then reflected by industrial camera 5. At this point, industrial camera 5 captures a grayscale value. Host computer 3 can convert grayscale values into illuminance values. The conversion relationship between illuminance and grayscale values is linear and can be obtained by fitting multiple actual illuminance values with grayscale values.

[0052] It should be noted that the movable aperture 43 effectively divides the light emitted by the lamp 1 into multiple segments. Each segment can be measured by the industrial camera 5 to obtain a grayscale value (which is then converted into an illuminance value). Furthermore, since each movement of the aperture 43 is non-overlapping, the multiple illuminance values can be linearly superimposed to obtain the final regulatory illuminance value for the lamp 1. Since the light emitted by automotive lamps can be considered incoherent, the total intensity of the emitted light beam is equal to the sum of the intensities of the individual beams.

[0053] As mentioned in the background technology, the test distance for automobile lights is generally 3.162m for taillights or signal lights. For automobile headlights, the test distance of the lamp must be at least 10m to avoid measurement errors caused by the large opening size of the lamp. It can generally be set to 25m. This will result in the need for a very large test site during actual testing. The present invention adopts a method of measuring the light beam of lamp 1 in different areas, which can reduce the light aperture and measurement distance by a certain proportion, and then superimpose the measurement results to obtain the final test result. In this way, the optical performance of lamp 1 can be tested on smaller testing equipment, and the detection efficiency is also improved.

[0054] The testing equipment also includes a display and alarm module 7, which is connected to the host computer 3. The display and alarm module 7 includes a display screen 71, an LED indicator light 72, and an audible alarm 73, all of which are connected to the host computer 3. After receiving the measurement data from the lamp 1, the host computer 3 can make a real-time judgment. The display screen 71 can display the relevant measurement parameters, measurement values, and qualified judgment results. When the lamp 1 is judged to be qualified, the LED indicator light 72 turns green. When the lamp 1 is judged to be unqualified, the LED indicator light 72 turns red, and the audible alarm 73 sounds an alarm. This allows staff to intuitively understand the test results of each lamp 1 and filter out defective products.

[0055] For example, the side of reflector 6 closest to lamp 1 is coated with a highly diffuse reflective coating. The coating material can be barium sulfate, polytetrafluoroethylene, polyurethane, or Teflon, which can improve reflectivity. For example, reflector 6 can be a curved plate that is concave away from lamp 1. This curved plate can increase the intensity of reflected light at the edge, facilitating edge light intensity detection. Reflector 6 is also provided with multiple marking points to facilitate calibration of industrial camera 5.

[0056] like Figures 7 and 8 As shown, the present invention also provides a method for using a testing device for large-sized luminaires based on an industrial camera, comprising the following steps:

[0057] S1. Setting the operating parameters of the programmable power supply 2 through the host computer 3, and lighting the lamp 1 to be detected through the programmable power supply 2.

[0058] S2. The host computer 3 controls the light transmission control module 4 to change the light transmission area of the light beam emitted by the lamp 1.

[0059] S3, after the different light transmission areas of the light beam emitted by the lamp 1 are irradiated on the reflector 6, they are captured by the industrial camera 5 to obtain multiple grayscale values .

[0060] S4, host computer 3 for multiple gray values After conversion and processing, the final regulatory illuminance of lamp 1 is obtained.

[0061] S5. The host computer 3 determines whether the final legal illumination is qualified and sends the judgment result to the display and alarm module 7 for display and alarm.

[0062] Host computer 3 can set the output parameters of programmable power supply 2 (e.g., voltage, current limit, etc.). Before testing lamp 1, host computer 3 controls industrial camera 5 to collect and save background light intensity data at different positions on reflector 6. If an error occurs during data reception, host computer 3 re-collects the data. After collecting the background data, host computer 3 turns on programmable power supply 2 to power lamp 1, which then emits a light beam that illuminates reflector 6.

[0063] For example, the two-dimensional moving mechanism 41 drives the light shield 42 to move, thereby changing the position of the light aperture 43. During each test, the intersection C of the line A connecting the center point of the light aperture 43 and the actual test point O with the reflector 6 is set as the test point. Because the light beam emitted by the lamp 1 is conical, the light beam that can pass through the light aperture 43 from the lamp 1 varies depending on the position of the light aperture 43, and the divergence angle also varies. Therefore, to reduce measurement error and improve test accuracy, the test point is set at intersection C. The industrial camera 5 can collect the grayscale value at intersection C.

[0064] The technical effect of this embodiment is described below by taking the (H, V) point illuminance of a reflective high beam lamp with a light-emitting surface size of 10 cm*10 cm as an example.

[0065] For example, the two-dimensional moving mechanism 41 drives the light shielding plate 42 to move, so that the light hole 43 passes through the test points P1 to P9 in sequence, and the industrial camera 5 can collect 9 grayscale values. ~ , the host computer converts the gray value according to the conversion formula ~ Convert to ~ Finally, the final legal illumination value (H, V) at 25m is calculated according to the formula .

[0066] For example, the illuminance values obtained from 9 measurements are 7954lx, 7182lx, 7937lx, 7326lx, 16469lx, 16481lx, 2300lx, 1838lx, and 3196lx, respectively. The vertical distance between the lamp 1 and the reflector 6 is 1m. Therefore, ~ are equal to 1 / 625 (i.e., 1 / 25 2 , the illuminance value is inversely proportional to the square of the distance). The final calculated legal illuminance value is 113.08 lx.

[0067] Using the Lucidshape platform for simulation, the high-beam spot illumination at 25 meters (H, V) is 119.3 lx (realistic value). However, without the light control module 2, the spot illumination of lamp 1 at 1 meter (H, V) is 71.4 lx (existing solution).

[0068] From this, we can calculate that the error in the measurement results of the prior art device is: (119.3lx - 71.4lx) / 119.3lx = 40.1%; while the error in the measurement results of the solution of this application is: (119.3lx - 113.08lx) / 119.3lx = 5.21%. This shows that compared with the prior art, the detection device and detection method of the present invention can significantly reduce measurement error and improve the accuracy of detection results.

[0069] The present invention can further improve the test accuracy by reducing the size of the light-through hole 43 and increasing the number of measurements.

[0070] In summary, the present invention utilizes the light transmission control module 4 to divide the light beam emitted by the lamp 1 into multiple blocks, utilizes the reflector 6 and the industrial camera 5 to perform illuminance tests on the light of different blocks, and then linearly superimposes the multiple illuminance values to obtain the final regulatory illuminance value. In this way, it is possible to perform optical testing on the lamp 1 on a small test device, thereby improving the space utilization rate of the site. Moreover, compared with the existing solution of using lenses for detection, the present invention eliminates the arrangement of a dark box, a lens, and an ideal diffuse reflection coating layer, and has a simpler structure, avoids the distortion caused by the lens, has high measurement accuracy, and is more economical. After being aligned with a standard lamp, the illuminance results of all points of the lamp can be quickly and accurately obtained. In addition, the present invention can also test various types of lamps without changing the hardware, which facilitates the universalization of the equipment.

[0071] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical spirit of this invention. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A test device for large luminous size lamps based on industrial cameras, characterized in that: include: the luminaire to be tested (1), and A programmable power supply (2), the programmable power supply (2) being connected to the lamp (1); A host computer (3), the host computer (3) is connected to the programmable power supply (2); A light transmission control module (4), the light transmission control module (4) being connected to the host computer (3), and the light transmission control module (4) being used to change the light transmission area of the light beam emitted by the lamp (1); An industrial camera (5), the industrial camera (5) is connected to the host computer (3), and the industrial camera (5) is connected to the programmable power supply (2); a reflector (6), the reflector (6) being located directly in front of the lamp (1) and being used to reflect light from the lamp (1); The light control module (4) comprises: A two-dimensional moving mechanism (41), the two-dimensional moving mechanism (41) is connected to the host computer (3); a light shielding plate (42), the light shielding plate (42) being connected to the two-dimensional moving mechanism (41), the light shielding plate (42) being located in front of the lamp (1), and having a light hole (43) formed on the light shielding plate (42); The final regulatory illuminance of the lamp (1) is: ,in, represents the final regulatory illuminance, ~ Indicates the illuminance value of different areas of the light beam emitted by the lamp. ~ Indicates the weights of different illumination values.

2. The test equipment for large luminous size lamps based on industrial cameras according to claim 1, characterized in that The length and width of the light hole (43) are x0 and y0 respectively, and the moving distance of the light shielding plate (42) each time is x0, y0, an integer multiple of x0 or an integer multiple of y0.

3. The testing equipment for large-sized luminaires based on industrial cameras according to claim 1, characterized in that: The illumination value ~ The expression is: in, ~ Indicates the grayscale values of different areas of the light beam emitted by the lamp captured by the industrial camera (5), ~ and ~ is a constant term.

4. The testing equipment for large-sized luminaires based on industrial cameras according to claim 1, characterized in that: A high diffuse reflection coating is provided on a side of the reflective plate (6) close to the lamp (1).

5. The testing equipment for large-sized luminaires based on industrial cameras according to claim 1, characterized in that: The reflective plate (6) is a curved plate that is recessed in a direction away from the lamp (1).

6. The testing equipment for large-sized luminaires based on industrial cameras according to claim 1, characterized in that: Also includes: A display alarm module (7) is connected to the host computer (3).

7. A method for using the testing device for large-sized luminaires based on an industrial camera according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, setting the operating parameters of the programmable power supply (2) through the host computer (3), and lighting the lamp (1) to be tested through the programmable power supply (2); S2, controlling the light transmission control module (4) through the host computer (3) to change the light transmission area of the light beam emitted by the lamp (1); S3, after the different light-transmitting areas of the light beam emitted by the lamp (1) are irradiated onto the reflective plate (6), they are captured by the industrial camera (5) to obtain multiple grayscale values ; S4, the host computer (3) processes multiple grayscale values After conversion and processing, the final regulatory illuminance of the lamp (1) is obtained.

8. The method for using the testing equipment for large-sized luminaires based on an industrial camera according to claim 7, characterized in that: Also includes: S5. The host computer (3) determines whether the final legal illumination is qualified and sends the determination result to the display and alarm module (7) for display and alarm.

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