Integrating sphere for scattered light test
By designing an integrating sphere with a double-layer spherical structure for testing scattered light, the problems of multiple equipment replacement steps and large errors in existing technologies are solved. This enables the calibration and testing of illuminance and brightness on the same equipment, improving testing accuracy and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-19
- Publication Date
- 2026-04-03
AI Technical Summary
Existing technologies require multiple equipment and operational steps to calibrate when testing scattered light from material surfaces, and the reflectivity and diffuse reflection characteristics of the reference sample are not good, resulting in large errors.
Design an integrating sphere for testing scattered light. It adopts a double-layer spherical structure. The outer layer uses a high diffuse reflectance material, and the inner layer uses a diffuse transmittance material processed by 3D printing or mold. The built-in light source is replaceable. The system can store multiple brightness coefficients, enabling calibration and testing of the same set of equipment.
It enables the calibration and testing of illuminance and luminance on the same equipment, reduces equipment replacement steps, has good Lambertian characteristics, reduces angular error, and improves test accuracy.
Smart Images
Figure CN224081067U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of integrating spheres, and in particular to an integrating sphere for testing scattered light. Background Technology
[0002] In surface scattering tests on materials, a BRDF (Brown-Radiant Difference) meter is typically used. During testing, when a light source illuminates the material surface, scattered light is generated. The illuminance / radiance is measured at a fixed incident angle, along with the luminance / radiance. However, calibration requires removing the sample and placing the illuminance / radiance detector below the light source. Calibration is performed after each adjustment of the light source. For luminance / radiance calibration, a reference sample is placed on the working surface, and calibration is then performed using a luminance meter / radiance meter. Therefore, the calibration process requires different testing equipment and different operating procedures. Furthermore, the reflectivity and diffuse reflection characteristics of the reference sample may not be ideal Lambertian reflectance, which can introduce errors.
[0003] Therefore, an integrating sphere for testing scattered light is needed. Utility Model Content
[0004] To address the aforementioned problems, this invention provides an integrating sphere for testing scattered light, which can replace the calibration method of a standard reflector.
[0005] This utility model includes an integrating sphere body, a square outer shell, an opening, a light source port, a detector, and an inner liner of the sphere. The integrating sphere body is disposed inside a square outer shell. The top of the square outer shell has an opening, the right side of the square outer shell has a light source port, and the front of the square outer shell has a detector. The detector is connected to a data acquisition and storage device. The inner liner of the sphere body is disposed inside the integrating sphere body. The opening is a blade-shaped opening to reduce reflection from the sphere's opening wall.
[0006] In the above scheme, the integrating sphere body is designed with a double-layer spherical structure. The outer layer is coated with a high diffuse reflectance material to homogenize the light illuminating the integrating sphere body. The inner liner of the sphere is made of diffuse transmittance material by 3D printing or molding to block the direct light from the outlet, the light source port and the detector port, thus acting as an internal baffle of the integrating sphere body.
[0007] In the above scheme, the blade opening of the integrating sphere body can serve as both a radiance testing port and a luminance emission port. With an opening ratio of less than one-third, it can serve as both a standard Lambertian receiver unit and a Lambertian emitter unit.
[0008] In the above scheme, the testing function is completed when the blade opening of the integrating sphere body is used as the irradiance testing port, and the calibration function is completed when the blade opening of the integrating sphere body is used as the luminance emission port. The calibration and testing are carried out under darkroom conditions.
[0009] In the above scheme, the integrating sphere body has a built-in light source.
[0010] In the above scheme, the built-in light source of the system is replaceable. The system can store multiple different brightness coefficients according to different built-in light sources, and call up the brightness coefficient according to the test light source that is consistent with the built-in light source selected during the test.
[0011] In the above scheme, the square outer shell is a metal integrating sphere shell, which is easy to fix on the flat base.
[0012] The advantages and beneficial effects of this utility model are as follows: This utility model provides an integrating sphere for testing scattered light. The system adopts the same structure, and the built-in detector can be used to test illuminance with this integrating sphere system. The built-in light source can calibrate the output brightness, eliminating the need to use an illuminance meter to test the illuminance and then replace it with a reference reflector to test the brightness. The system has good Lambertian characteristics, excellent illuminance testing angle response characteristics, and the brightness test is not affected by angle errors. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is a front cross-sectional view of the integrating sphere.
[0016] Figure 3 A schematic diagram showing the integration sphere itself used as an illuminance integration sphere.
[0017] Figure 4 A schematic diagram of the integrating sphere as a uniform light source.
[0018] In the diagram: 1. Integrating sphere body; 2. Square outer shell; 3. Opening; 4. Light source port.
[0019] 5. Detector; 6. Inner chamber of the sphere Detailed Implementation
[0020] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.
[0021] like Figure 1 , Figure 2 As shown, this utility model is an integrating sphere for testing scattered light, including an integrating sphere body 1, a square outer shell 2, an opening 3, a light source port 4, a detector 5, and an inner sphere 6. The integrating sphere body 1 is housed within a square outer shell 2. The top of the square outer shell 2 has an opening 3, the right side of the square outer shell 2 has a light source port 4, and the front of the square outer shell 2 has a detector 5. The detector 5 is connected to data acquisition and storage equipment. The inner sphere 6 is located inside the integrating sphere body 1. The opening 3 is a knife-edge type to reduce reflection from the sphere's aperture wall and increase the field of view. The detector 5 can store the response coefficients of both the illuminance / radiance parameters of the incident light source and the response coefficients of the luminance / radiance parameters generated by the built-in light source.
[0022] The integrating sphere body 1 is designed with a double-layer spherical structure. The outer layer is coated with a high diffuse reflectance material with a reflectivity of over 95%, which is used to homogenize the light illuminating the integrating sphere body 1. The inner liner 6 of the sphere is made of diffuse transmittance material processed by 3D printing or molding. In addition to homogenizing the light, it also blocks the direct light from the outlet, the light source port 4, and the detector port 5, acting as an internal baffle of the integrating sphere body. At the same time, it also prevents the light source and detector 5 from being directly visible from the outlet, thus improving the uniformity of the integrating sphere body 1.
[0023] The blade opening of the integrating sphere can serve as both a radiance testing port and a luminance emission port. With an opening ratio of less than one-third, it can function as both a standard Lambertian receiver unit and a Lambertian emitter unit.
[0024] The testing function is completed when the blade opening of the integrating sphere body is used as the irradiance testing port, and the calibration function is completed when the blade opening of the integrating sphere body is used as the luminance emission port. Calibration and testing are carried out under darkroom conditions.
[0025] The integrating sphere can have a built-in light source or use an external light source. The integrated sphere itself has a built-in light source. The built-in light source is replaceable, and the system can store multiple different brightness coefficients depending on the built-in light source. The system can then retrieve the brightness coefficient based on the test light source selected during testing that matches the built-in light source.
[0026] Before illuminance / radiance testing, the integrating sphere response needs to be calibrated using a known standard light source. The illuminance / radiance response calibrations are performed separately, and the coefficients are stored. The system can store multiple different coefficients depending on the test light source, and the coefficients can be retrieved based on the selected test light source. Similarly, before luminance / radiance testing, the integrating sphere luminance response needs to be calibrated using the built-in light source. The luminance / radiance response calibrations are performed separately, and the coefficients are stored. The system's built-in light source is replaceable, and the system can store multiple different coefficients depending on the built-in light source. The coefficients can be retrieved based on the test light source selected to match the built-in light source during testing.
[0027] The square outer shell is made of metal and serves as the integrating sphere's outer casing, facilitating its mounting on a flat base. The metal material protects the internal structure and provides scratch and abrasion resistance. The opening of the integrating sphere must be aligned with the plane being measured.
[0028] like Figure 3 As shown, when the integrating sphere 1 is used as an integrating sphere for illuminance measurement, after the light is homogenized inside the integrating sphere 1, the radiant flux and illuminance of any light source incident on the integrating sphere 1 can be detected by the detector that has been calibrated on the front of the integrating sphere 1.
[0029] like Figure 4 As shown, when the integrating sphere body 1 is used as an integrating sphere for luminance emission light source, the light from the built-in light source is homogenized inside the integrating sphere body 1 and then produces luminance at the outlet 3. By calibrating the detector 4 with the external standard luminance / radiance testing equipment, the luminance / radiance of the light source produced by the integrating sphere body 1 can be determined.
[0030] This device can use an integrating sphere as an ideal Lambertian reflector. Through good design, it can be used as both a standard illuminance receiving unit and a Lambertian reflector emitting unit. The brightness consistency of the integrating sphere unit in different directions is far better than any diffuse reflector. At the same time, the illuminance and brightness can be pre-calibrated and stored, and the light source and brightness testing unit can be calibrated before testing.
[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An integrating sphere for scatter light testing, characterized in that Integrating sphere body, square shell, opening, light source port, detector and ball inner container, the integrating sphere body is arranged in a square shell, the square shell is provided with an opening at the top, the square shell is provided with a light source port at the right side, the square shell is provided with a detector at the front side, the detector is connected with a data acquisition and storage device, the integrating sphere body is provided with a ball inner container, the opening is a blade-shaped opening for reducing the reflection of the ball opening wall.
2. The integrating sphere for scatter light testing according to claim 1, wherein, The integrating sphere body is designed as a double-layer spherical structure, the outer layer is sprayed with high diffuse reflection material, which is used for homogenizing the light irradiated into the integrating sphere body; the ball inner container is made of 3D printing or mold processing diffuse transmission material, which blocks the direct light of the exit port, the light source port and the detector port, and plays the role of the baffle in the integrating sphere body.
3. The integrating sphere for scatter light testing according to claim 2, wherein, The blade opening of the integrating sphere body can be used as a radiation illuminance test port and a brightness emission port, and the opening ratio is less than one third, so that the integrating sphere body can be used as a standard Lambertian receiving unit and a Lambertian emitting unit.
4. The integrating sphere for scatter light testing according to claim 3, wherein, When the blade opening of the integrating sphere body is used as a radiation illuminance test port, the test function is completed, and when the blade opening of the integrating sphere body is used as a brightness emission port, the calibration function is completed, and the calibration and test are carried out in a darkroom.
5. The integrating sphere for scatter light testing according to claim 2, wherein, The integrating sphere body is provided with a light source.
6. The integrating sphere for scatter light testing according to claim 5, wherein, The built-in light source of the system can be replaced, the system can store a plurality of different brightness coefficients according to different built-in light sources, and the brightness coefficient is called according to the test light source selected and consistent with the built-in light source during the test.
7. The integrating sphere for scatter light testing according to claim 1, wherein, The square shell is an integrating sphere shell made of metal material, which is convenient to fix on a plane base.