Guide rail structure for BRDF test

Abstract

Provided is a guide rail structure for BRDF testing. A light source azimuth angle sliding block (2) is driven by a motor to move on a light source azimuth angle guide rail (1). The bottom of the light source polar angle guide rail (3) is fixedly arranged on the light source azimuth angle sliding block (2); the light source polar angle sliding block (4) is driven by a motor to move on the light source polar angle guide rail (3). The detector azimuth angle sliding block (6) is driven by a motor to move on the detector azimuth angle guide rail (5); the detector azimuth angle sliding block (6) and the detector polar angle guide rail (7) are connected through a rotating shaft, and the detector polar angle sliding block (8) is fixedly installed at the top end of the detector polar angle guide rail (7); and the detector polar angle slide block (8) is driven by a motor to move on the light source polar angle guide rail (7). According to the guide rail structure for BRDF testing, a light source can automatically move to any position in a 2-pi space, a detector can automatically move to any position in a 4-pi space, and omnibearing measurement is achieved.

Description

Technical Field

[0001] The utility model relates to the field of electronic technology, in particular to a guide rail structure for BRDF testing. Background Art

[0002] The bidirectional reflectance distribution function (BRDF) is used to define how the irradiance in a given incoming direction affects the radiance in a given outgoing direction. More generally, it describes how the incident light is distributed in each outgoing direction after being reflected by a surface - this can be a variety of reflections from perfect mirror reflection to diffuse reflection, isotropic or anisotropic.

[0003] When light hits an object, it first produces reflection, absorption and transmission, so the key factor of BRDF is how much light is reflected, absorbed and transmitted (refracted), and how it changes. At this time, the reflection is mostly diffuse reflection. To know the changes in the reflection and transmission of these light rays, you need to know three things: the surface material of the object, the wavelength of the light (that is, what kind of light it is, visible sunlight, energy-saving light or ultraviolet light) and the positional relationship between the observer and the object. The three-dimensional world angle can be similar to a sphere. In addition to the 180° change in the longitudinal direction, the light angle also has different divergent directions of 360° in the horizontal direction. There will be corresponding incident light, reflected light, incident angle and reflection angle, and their relationship on the normal plane and tangent plane of the object surface has become the key parameter of BRDF. Due to the special sensitivity of human eyes to light, the reason why we can see objects is achieved through the emission and transfer of light on the object. The function representation such as bidirectional reflectance distribution can better describe the changes of light on the object. The reflected light is sent to the observer and light source distributed on both sides of the normal at the same time, so that people can visually see better object simulation effects in simulation environments such as computers, as if real objects exist.

[0004] Most current BRDF test equipment uses a BRDF measurement method in which the sample is stationary while the light source and detector rotate. This method provides intuitive measurement results. However, the current test rail structure has a cumbersome operation process, a limited test distance, and needs to improve the angle measurement accuracy. Therefore, it is necessary to provide a BRDF test rail structure. Utility Model Content

[0005] In order to solve the above problems existing in the prior art, the utility model provides a guide rail structure for BRDF testing.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A guide rail structure for BRDF testing, the guide rail structure comprises a light source azimuth guide rail 1, a light source azimuth slider 2, a light source polar angle guide rail 3, a light source polar angle slider 4, a detector azimuth guide rail 5, a detector azimuth slider 6, a detector polar angle guide rail 7, a detector polar angle slider 8 and a sample stage 9; wherein: the light source azimuth guide rail 1 is in a circular ring shape, the light source azimuth slider 2 is driven to move on the light source azimuth guide rail 1 by a motor; the light source polar angle guide rail 3 is in an arc shape, the bottom of the light source polar angle guide rail 3 is fixedly mounted on the light source azimuth slider 2; the light source polar angle slider 4 is at the light source polar angle. The detector azimuth guide rail 3 is driven to move by a motor; the detector azimuth guide rail 5 is in a circular shape, and the detector azimuth slider 6 is driven to move by a motor on the detector azimuth guide rail 5; the detector azimuth slider 6 and the detector polar angle guide rail 7 are connected via a rotating shaft, and the detector polar angle slider 8 is installed and fixed on the top of the detector polar angle guide rail 7; the detector polar angle slider 8 is driven to move on the detector polar angle guide rail 7 by a motor; the detector polar angle guide rail 7 can rotate with the rotating shaft as the center line, and the detector polar angle guide rail 7 can rotate to the top or bottom of the sample stage 9.

[0008] The utility model also has the following additional technical features:

[0009] As a further specific optimization of the technical solution of the utility model: the light source azimuth slider 2 moves 360° along the light source azimuth guide rail 1;

[0010] As a further specific optimization of the technical solution of the utility model: the light source polar angle guide rail 3 can be driven by the light source azimuth angle slider 2 to move 360° along the light source azimuth angle guide rail 1;

[0011] As a further specific optimization of the technical solution of the utility model: the light source polar angle slider 4 moves 0-90° along the light source polar angle guide rail 3;

[0012] As a further specific optimization of the technical solution of the utility model: a light source is installed on the light source polar angle slider 4, and the light source can cover a 2π space;

[0013] As a further specific optimization of the technical solution of the utility model: the detector azimuth slider 6 moves 0-90° along the detector azimuth guide rail 5;

[0014] As a further specific optimization of the technical solution of the utility model: the detector is installed on the detector polar angle slider, and when the detector polar angle guide rail 7 rotates to the upper side, the detector can perform reflection measurement; when the detector polar angle guide rail 7 rotates to the lower side, the detector can perform transmission measurement; the detector can cover a 4π space;

[0015] As a further specific optimization of the technical solution of the utility model: the center of the sample stage 9 is hollowed out, so that both reflection test and transmission test can be performed.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The guide rail structure for BRDF testing of the utility model can automatically move the light source to any position in the 2π space, and can automatically move the detector to any position in the 4π space, thereby realizing all-round measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the guide rail structure for BRDF testing of the utility model;

[0019] Figure 2 This is a schematic diagram of the BRDF testing principle of the utility model.

[0020] Explanation of the reference numerals: 1. light source azimuth guide; 2. light source azimuth slider; 3. light source polar angle guide; 4. light source polar angle slider; 5. detector azimuth guide; 6. detector azimuth slider; 7. detector polar angle guide; 8. detector polar angle slider; 9. sample stage. DETAILED DESCRIPTION

[0021] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0022] Example 1

[0023] Guide rail structure for BRDF testing, Figure 1 This is a schematic diagram of the guide rail structure for BRDF testing of the utility model, wherein the guide rail structure includes a light source azimuth guide rail 1, a light source azimuth slider 2, a light source polar angle guide rail 3, a light source polar angle slider 4, a detector azimuth guide rail 5, a detector azimuth slider 6, a detector polar angle guide rail 7, a detector polar angle slider 8 and a sample table 9.

[0024] The light source azimuth guide rail 1 is in a circular shape, and the light source azimuth slider 2 is driven to move on the light source azimuth guide rail 1 by a motor; the light source azimuth slider 2 moves 360° along the light source azimuth guide rail 1.

[0025] A high-precision stepper motor and a roller are installed inside the light source azimuth slider 2, and the high-precision stepper motor drives the light source azimuth slider 2 to move on the light source azimuth guide rail 1. The arrangement and installation of the high-precision stepper motor and the roller are prior art and will not be described in detail here.

[0026] The light source polar angle guide rail 3 is in an arc shape, the bottom of the light source polar angle guide rail 3 is fixedly mounted on the light source azimuth angle slider 2, and the light source polar angle guide rail 3 can move 360° along the light source azimuth angle guide rail 1 driven by the light source azimuth angle slider 2.

[0027] The light source polar angle slider 4 is driven to move on the light source polar angle guide rail 3 by a motor; the light source polar angle slider 4 moves 0-90° along the light source polar angle guide rail 3; a light source is installed on the light source polar angle slider 4, and the light source can cover a 2π space.

[0028] A high-precision stepper motor and a roller are installed inside the light source polar angle slider 4, and the high-precision stepper motor drives the light source polar angle slider 4 to move on the light source polar angle guide rail 3. The arrangement and installation of the high-precision stepper motor and the roller are prior art and will not be described in detail here.

[0029] The detector azimuth guide rail 5 is in a circular shape, and the detector azimuth slider 6 is driven by a motor to move on the detector azimuth guide rail 5; the detector azimuth slider 6 moves 0-90° along the detector azimuth guide rail 5;

[0030] A high-precision stepper motor and a roller are installed inside the detector azimuth slider 6, and the high-precision stepper motor drives the detector azimuth slider 6 to move on the detector azimuth guide rail 5. The arrangement and installation of the high-precision stepper motor and the roller are prior art and will not be described in detail here.

[0031] The detector azimuth slider 6 and the detector polar angle guide 7 are connected via a rotating shaft, and the detector polar angle guide 7 can rotate with the rotating shaft as the center line, and the detector polar angle guide 7 can rotate to the top or bottom of the sample stage 9. A high-precision stepper motor is installed inside the detector azimuth slider 6, and the high-precision stepper motor drives the detector polar angle guide 7 to rotate. The setting and installation of the high-precision stepper motor are prior art and will not be described in detail here.

[0032] The detector polar angle slider 8 is fixedly mounted on the top of the detector polar angle guide rail 7; a high-precision stepper motor and a roller are installed inside the detector polar angle slider 8, and the high-precision stepper motor drives the detector polar angle slider 8 to move on the detector polar angle guide rail 7. The arrangement and installation of the high-precision stepper motor and the roller are prior art and will not be described in detail here.

[0033] The detector is mounted on the detector polar angle slider. When the detector polar angle guide 7 rotates upward, the detector can perform reflection measurement. When the detector polar angle guide 7 rotates downward, the detector can perform transmission measurement. The detector can cover a 4π space.

[0034] The center of the sample stage 9 is hollowed out to facilitate transmission measurement and reduce weight.

[0035] Example 2

[0036] The guide rail structure for BRDF testing and BRDF measurement equipment are used to measure the scattering characteristics of various materials. The reflection and transmission radiance of samples under different geometric conditions can be measured by rotating the light source in two dimensions and the detector in three dimensions.

[0037] The light source azimuth slider is driven by a motor to move on the light source azimuth guide rail, and the light source polar angle guide rail can move 360° along the light source azimuth guide rail. The light source polar angle slider is driven by a motor to move on the light source polar angle guide rail, and the light source slider can move 0-90° along the light source polar angle guide rail. The light source is installed on the light source polar angle slider, which can cover 2π space.

[0038] The detector azimuth slider is driven by a motor to move on the detector azimuth guide rail, and the detector polar angle guide rail can move 360° along the detector azimuth guide rail. The detector polar angle slider is driven by a motor to move on the detector polar angle guide rail, and the detector slider can move 0-90° along the detector polar angle guide rail. The detector polar angle guide rail and the detector azimuth slider are connected by a rotating shaft in the middle. The detector polar angle guide rail can be rotated to the top or bottom of the sample stage. When it is rotated to the top, reflection measurement can be performed, and when it is rotated to the bottom, transmission measurement can be performed. The detector is installed on the detector polar angle slider, which can cover 4π space.

[0039] The guide rail adopts a double cantilever structure, which can cover the entire 4π test space. The light source and detector use high-precision stepper motors to ensure the accuracy of reflection and transmission angles.

[0040] Figure 2 The BRDF test principle diagram of the utility model is as follows:

[0041] i is the incident light source, θi is the polar angle of the light source, and φi is the azimuth angle of the light source.

[0042] r is the detector, ri is the detector polar angle, and φr is the detector azimuth angle.

[0043] BRDF = Lr / Ei, which is the ratio of the detector's radiance to the light source's irradiance.

[0044] The above formula can be used to measure the reflection or transmission of the light source at different incident angles and obtain the BRDF characteristics of the sample material.

[0045] In summary, Example 1 and Example 2:

[0046] The guide rail structure can be used for BRDF reflection and transmission measurement. The guide rail adopts a double cantilever structure, the light source covers a 2π space, and the detector covers a 4π space test range. The detector guide rail and rotation mechanism can move the detector within the entire spherical range to achieve the measurement of reflection and transmission signals. The automated guide rail structure can achieve all-round measurement and reduce the cumbersome movement process during the test.

[0047] The above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention but merely represents selected embodiments of the present invention.

Claims

1. A guide rail structure for BRDF testing, characterized in that: The guide rail structure comprises a light source azimuth guide rail (1), a light source azimuth slider (2), a light source polar angle guide rail (3), a light source polar angle slider (4), a detector azimuth guide rail (5), a detector azimuth slider (6), a detector polar angle guide rail (7), a detector polar angle slider (8) and a sample stage (9); wherein: the light source azimuth guide rail (1) is in a circular ring shape, and the light source azimuth slider (2) is driven to move on the light source azimuth guide rail (1) by a motor; the light source polar angle guide rail (3) is in an arc shape, and the bottom of the light source polar angle guide rail (3) is fixedly mounted on the light source azimuth slider (2); The source polar angle slider (4) is driven to move on the light source polar angle guide rail (3) by a motor; the detector azimuth guide rail (5) is in a circular shape, and the detector azimuth slider (6) is driven to move on the detector azimuth guide rail (5) by a motor; the detector azimuth slider (6) and the detector polar angle guide rail (7) are connected via a rotating shaft, and the detector polar angle slider (8) is installed and fixed on the top of the detector polar angle guide rail (7); the detector polar angle guide rail (7) can rotate with the rotating shaft as the center line, and the detector polar angle guide rail (7) can rotate to the top or bottom of the sample stage (9).

2. A guide rail structure for BRDF testing according to claim 1, characterized in that: The light source azimuth sliding block (2) moves 360 degrees along the light source azimuth guiding rail (1).

3. A guide rail structure for BRDF testing according to claim 1, characterized in that: The light source polar angle guide rail (3) can be moved 360 degrees along the light source azimuth guide rail (1) by being driven by the light source azimuth slider (2).

4. A guide rail structure for BRDF testing according to claim 1, characterized in that: The light source polar angle slider (4) moves 0-90 degrees along the light source polar angle guide rail (3).

5. A guide rail structure for BRDF testing according to claim 1, characterized in that: A light source is installed on the light source polar angle slider (4), and the light source can be moved to any position in the 2π space to cover the entire 2π space.

6. A guide rail structure for BRDF testing according to claim 1, characterized in that: The detector azimuth sliding block (6) moves 0-90 degrees along the detector azimuth guiding rail (5).

7. A guide rail structure for BRDF testing according to claim 1, characterized in that: The detector is mounted on the detector polar angle slider; when the detector polar angle guide (7) rotates upward, the detector can perform reflection measurement; when the detector polar angle guide (7) rotates downward, the detector can perform transmission measurement; the detector can be moved to any position in the 4π space, covering the entire 4π space.

8. A guide rail structure for BRDF testing according to claim 1, characterized in that: The center of the sample stage (9) is hollowed out; when a sample is placed on the sample stage (9), reflection and transmission tests can be performed.

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