Linear polarizer direction calibration device and linear polarizer direction calibration method for digital human acquisition

Abstract

The application discloses a linear polaroid direction calibration device and method for digital human collection. The linear polaroid direction calibration device for digital human collection comprises a photosensitive element, a light-emitting element, a first polarizing frame and a second polarizing frame. The light-emitting element is arranged opposite to the photosensitive element and is used for emitting light rays towards the photosensitive element. The first polarizing frame and the second polarizing frame are both provided with polaroids and are sequentially and spacedly distributed between the photosensitive element and the light-emitting element. The first polarizing frame and the second polarizing frame are arranged to be individually or synchronously movable relative to the light-emitting element. The linear polaroid direction calibration device for digital human collection can effectively measure and calibrate the polarization parameters and polarization performance of two polaroids, and has the advantages of simple structure and convenient testing.

Description

Technical Field

[0001] This invention relates to the field of optical equipment testing technology, and in particular to a linear polarizer orientation calibration device and a linear polarizer orientation calibration method for digital human acquisition. Background Technology

[0002] A linear polarizer (hereinafter referred to as a polarizer) is an optical element that allows only the component of light with the same polarization direction as the polarizer to pass through after passing through it. Therefore, a polarizer can be simply understood as adjusting and filtering the polarization direction of light. In optical experiments, linear polarizers are frequently used to adjust the polarization state of light. In some special experiments, it is necessary to specify the polarizer's direction. However, common polarizers do not have their direction marked at the factory, making their use inconvenient. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to provide a linear polarizer orientation calibration device for digital human data acquisition, which can accurately test the polarization direction and polarization effect of the polarizer.

[0004] According to an embodiment of the present invention, a linear polarizer orientation calibration device for digital human acquisition includes: a photosensitive element; a light-emitting element, wherein the light-emitting element is disposed opposite to the photosensitive element and is used to emit light toward the photosensitive element; a first polarizer and a second polarizer, both of which are provided with polarizers, and the first polarizer and the second polarizer are sequentially spaced apart between the photosensitive element and the light-emitting element, wherein the first polarizer and the second polarizer are configured to move independently or simultaneously relative to the light-emitting element.

[0005] According to an embodiment of the present invention, a linear polarizer orientation calibration device for digital human acquisition can effectively measure and calibrate the polarization parameters and polarization performance of two polarizers by setting a first polarizer and a second polarizer with flexibly adjustable position states between the photosensitive element and the light-emitting element. The device has a simple structure and is convenient for testing.

[0006] According to some embodiments of the present invention, in a linear polarizer orientation calibration device for digital human acquisition, both the first polarizer and the second polarizer are configured to rotate about a rotation axis relative to the light-emitting element.

[0007] According to some embodiments of the present invention, a linear polarizer orientation calibration device for digital human acquisition is provided, wherein the first polarizer is configured to rotate about a first rotation axis and a second rotation axis respectively, the first rotation axis being perpendicular to the second rotation axis and both passing through the center of the first polarizer; the second polarizer is configured to rotate about a third rotation axis and a fourth rotation axis respectively, the third rotation axis being perpendicular to the fourth rotation axis and both passing through the center of the second polarizer.

[0008] According to some embodiments of the present invention, in a linear polarizer orientation calibration device for digital human acquisition, the first rotation axis is parallel and spaced apart from the third rotation axis, and the second rotation axis is parallel and spaced apart from the fourth rotation axis.

[0009] According to some embodiments of the present invention, a linear polarizer orientation calibration device for digital human acquisition further includes: a first driving member and a second driving member, wherein the first driving member is connected to the first polarizer and is used to drive the first polarizer to rotate, and the second driving member is connected to the second polarizer and is used to drive the second polarizer to rotate.

[0010] According to some embodiments of the present invention, in a linear polarizer orientation calibration device for digital human acquisition, both the first driving member and the second driving member are configured as electrically driven members.

[0011] According to some embodiments of the present invention, a linear polarizer orientation calibration device for digital human acquisition further includes a mounting base, wherein the photosensitive element, the light-emitting element, the first polarizer and the second polarizer are all movably mounted on the mounting base, and the spacing between any two of the photosensitive element, the light-emitting element, the first polarizer and the second polarizer is adjustable.

[0012] According to some embodiments of the present invention, in a linear polarizer orientation calibration device for digital human acquisition, the photosensitive element, the light-emitting element, the first polarizer and the second polarizer are all connected to a movable rod at the bottom, and the lower end of the movable rod is slidably engaged with the mounting base.

[0013] According to some embodiments of the present invention, a linear polarizer orientation calibration device for digital human acquisition is provided at the bottom of the movable rod, and a sliding guide rail is provided on the mounting base. The extending direction of the sliding groove is the same as the arrangement direction of the light-emitting element and the photosensitive element, and the sliding guide rail is slidably installed in the sliding groove.

[0014] This invention also proposes a method for calibrating the orientation of a linear polarizer for digital human data acquisition.

[0015] The linear polarizer orientation calibration method for digital human acquisition according to embodiments of the present invention is applicable to the linear polarizer orientation calibration device for digital human acquisition described in any of the above embodiments, and the linear polarizer orientation calibration method for digital human acquisition includes: installing a photosensitive element, a light-emitting element, a first polarizer frame, and a second polarizer frame; adjusting the first polarizer frame and the second polarizer frame to an initial angle; fixing the first polarizer frame, adjusting the angle of the second polarizer frame, and recording the measurement results of the photosensitive element; adjusting the polarization direction of the second polarizer frame to the angle that minimizes the light intensity, so that the polarization directions of the polarizers corresponding to the first polarizer frame and the second polarizer frame are perpendicular to each other; rotating the second polarizer frame about its center at 45° relative to the third axis and the fourth axis, respectively; rotating the first polarizer frame and the second polarizer frame about their own center at the same angular velocity and in the same direction, and recording the measurement results of the photosensitive element; adjusting both the first polarizer frame and the second polarizer frame to the angle that minimizes the light intensity, and locking the polarizers.

[0016] The linear polarizer orientation calibration method for digital human acquisition described above and the linear polarizer orientation calibration device for digital human acquisition have the same advantages over the prior art, and will not be repeated here.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of a linear polarizer orientation calibration device for digital human data acquisition according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of a linear polarizer orientation calibration device for digital human acquisition according to an embodiment of the present invention (the second polarizer is in an inclined state).

[0021] Figure label:

[0022] Linear polarizer orientation calibration device 1 for digital human data acquisition.

[0023] Light-emitting element 11, first polarizer 12, first drive element 121, second polarizer 13, second drive element 131, polarizer 14, photosensitive element 15, photosensitive entrance 151, movable rod 16, mounting base 17, sliding groove 171. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] The following is for reference. Figures 1-2 The linear polarizer orientation calibration device 1 for digital human acquisition according to an embodiment of the present invention includes: a photosensitive element 15, a light-emitting element 11, a first polarizer 12, and a second polarizer 13.

[0026] The light-emitting element 11 contains a light source adapted to emit light outwards. The photosensitive element 15 has a photosensitive inlet 151, through which external light can enter the photosensitive element 15, allowing it to be connected to an analysis device for analysis. Figure 1 and Figure 2 As shown, the light-emitting element 11 and the photosensitive element 15 are arranged facing each other, and the direction of the light emitted by the light-emitting element 11 is directly opposite to the position of the photosensitive element 15, so that the light-emitting element 11 emits light towards the photosensitive element 15, so that the light emitted by the light-emitting element 11 can enter the photosensitive element 15 from the photosensitive inlet 151.

[0027] Both the first polarizer 12 and the second polarizer 13 are equipped with polarizers 14. Polarizers 14 can polarize light. When light passes through polarizer 14, only the component of light with the same polarization direction as polarizer 14 can pass through. Therefore, polarizer 14 can be simply understood as adjusting and filtering the polarization direction of light. It should be noted that, assuming the angle between the current polarization direction of light with intensity I0 and the polarization direction of polarizer 14 is θ, then the intensity of the light after passing through polarizer 14 is I = I0cosθ. ^2 θ. When a beam of light without polarization passes through a polarizer 14, its intensity is reduced to half of its original value. Theoretically, when a beam of light without polarization passes through two polarizers 14 with perpendicular polarization directions, it should be completely blocked. However, if one of the two polarizers 14 is fixed, adjusting the angle between it and the other polarizer 14 will change the intensity of the transmitted light accordingly.

[0028] Specifically, such as Figure 1 and Figure 2As shown, the first polarizer 12 and the second polarizer 13 are sequentially spaced apart between the photosensitive element 15 and the light-emitting element 11, with the first polarizer 12 positioned closer to the photosensitive element 15 and the second polarizer 13 positioned closer to the light-emitting element 11. The axes of the light-emitting element 11, the first polarizer 12, the second polarizer 13, and the photosensitive element 15 can be aligned. Thus, when the light-emitting element 11 emits light, the light is emitted to the polarizer 14 of the second polarizer 13, further to the polarizer 14 of the first polarizer 12, and finally to the photosensitive element 15. The first polarizer 12 and the second polarizer 13 are configured to move independently or simultaneously relative to the light-emitting element 11, meaning they can rotate or move relative to the light-emitting element 11 to produce different polarization effects.

[0029] When calibrating the polarizers 14 on the two polarizer frames, the first polarizer 12 and the second polarizer 13 can be adjusted individually or simultaneously to change the relative angle of the two polarizers 14, thus producing different polarization effects. Therefore, in actual testing, one of the second polarizer frames 13 can be fixed first, while the position or angle of the first polarizer frame 12 can be adjusted. The light intensity of the corresponding polarizer 14 can then be measured and recorded by the photosensitive element 15. In other words, the positions of the first polarizer frame 12 and the second polarizer frame 13 can be inverted, and testing and calibration can be performed in the same way to test the polarization effect at different angles and comprehensively determine the polarization characteristics of the polarizers 14.

[0030] According to an embodiment of the present invention, the linear polarizer orientation calibration device 1 for digital human acquisition can effectively measure and calibrate the polarization parameters and polarization performance of two polarizers 14 by setting a first polarizer 12 and a second polarizer 13 with flexibly adjustable position states between the photosensitive element 15 and the light-emitting element 11. The device has a simple structure and is convenient for testing.

[0031] In some embodiments, the first polarizer 12 and the second polarizer 13 are both configured to rotate about a rotation axis relative to the light-emitting element 11. In other words, the first polarizer 12 and the second polarizer 13 can rotate relative to the light-emitting element 11 to different angle states, so that the angles of the corresponding two polarizers 14 can be adjusted accordingly. In this way, when the polarizers 14 are at different rotation angles, the corresponding polarization effect can be measured.

[0032] Among them, such as Figure 1 and Figure 2 As shown, the first polarizing frame 12 and the second polarizing frame 13 are spaced apart, allowing for independent angle adjustment and testing, ensuring more accurate and comprehensive test results.

[0033] In some embodiments, the first polarizing frame 12 is configured to rotate about a first rotation axis and a second rotation axis respectively. The first rotation axis is perpendicular to the second rotation axis and both pass through the center of the first polarizing frame 12. In this way, the first polarizing frame 12 can rotate relative to two perpendicular directions, so that the polarizer 14 corresponding to the first polarizing frame 12 rotates to different spatial angles, thereby realizing the testing of the polarization effect of the polarizer 14 at more angles.

[0034] Furthermore, the second polarizing frame 13 is configured to rotate about the third rotation axis and the fourth rotation axis respectively. The third rotation axis is perpendicular to the fourth rotation axis and both pass through the center of the second polarizing frame 13. In this way, the second polarizing frame 13 can rotate relative to two perpendicular directions, so that the polarizer 14 corresponding to the second polarizing frame 13 can rotate to different spatial angles, thereby enabling the polarization effect of the polarizer 14 at more angles to be tested.

[0035] In some embodiments, the first rotation axis is parallel and spaced apart from the third rotation axis, and the second rotation axis is parallel and spaced apart from the fourth rotation axis. It should be noted that during the rotation of the first polarizer 12 and the second polarizer 13, the positions of the corresponding first, second, third, and fourth rotation axes also gradually change, thereby allowing for more sophisticated angle adjustments of the polarizer 14.

[0036] Among them, such as Figure 1 As shown, the polarizers 14 of the second polarizer 13 and the first polarizer 12 are in a parallel state. At this time, both the first and second rotation axes are perpendicular to the axis of the polarizer 14 on the first polarizer 12. The first rotation axis extends horizontally, and the second rotation axis is perpendicular to both the first rotation axis and the axis of the polarizer 14. In other words, in actual construction, the first rotation axis, the second rotation axis, and the axis of the polarizer 14 on the first polarizer 12 are all perpendicular to each other. Similarly, the first rotation axis, the second rotation axis, and the axis of the polarizer 14 on the first polarizer 12 are all perpendicular to each other.

[0037] Therefore, the angle of the polarizer 14 on the first polarizer 12 relative to the light-emitting element 11 on different planes can be adjusted. Correspondingly, the angle of the polarizer 14 on the second polarizer 13 relative to the light-emitting element 11 on different planes can also be adjusted, thereby allowing for a wider range and more flexible adjustment of the test conditions of the polarizer 14, and achieving more comprehensive testing.

[0038] In some embodiments, the linear polarizer orientation calibration device 1 for digital human acquisition further includes: a first driving member 121 and a second driving member 131, wherein the first driving member 121 is connected to the first polarizer 12 and is used to drive the first polarizer 12 to rotate, and the second driving member 131 is connected to the second polarizer 13 and is used to drive the second polarizer 13 to rotate.

[0039] In this way, when the angle of the polarizer 14 is actually adjusted, the first drive unit 121 and the second drive unit 131 can be controlled to adjust the corresponding polarizer frame respectively, so that the two polarizer frames can rotate independently. Of course, the first drive unit 121 and the second drive unit 131 can operate synchronously.

[0040] In some embodiments, both the first driving member 121 and the second driving member 131 are configured as electric driving members, meaning that the first driving member 121 and the second driving member 131 can be electrically controlled by a control element, resulting in a simple structure and convenient control. The electric driving member can be an electric motor. Specifically, when the first driving member 121 is configured as an electric motor, the output end of the electric motor can be connected to the first polarizing frame 12 to drive the first polarizing frame 12 to rotate through the output driving force, thereby achieving angle adjustment of the corresponding polarizer 14.

[0041] In actual design, such as Figure 1 and Figure 2 As shown, the first driving member 121 is mounted above the first polarizing frame 12, and the second driving member 131 is mounted above the second polarizing frame 13. The first driving member 121 and the second driving member 131 can be fixed by other structures to provide support force and thus drive the corresponding polarizing frames.

[0042] Of course, the first drive component 121 and the second drive component can also be other types of drive structures, such as drive cylinders, or they can be manually driven.

[0043] In some embodiments, the linear polarizer orientation calibration device 1 for digital human acquisition further includes a mounting base 17, on which the photosensitive element 15, the light-emitting element 11, the first polarizer 12 and the second polarizer 13 can all be movably mounted, and the spacing between any two of the photosensitive element 15, the light-emitting element 11, the first polarizer 12 and the second polarizer 13 can be adjusted.

[0044] like Figures 1-2As shown, the mounting base 17 is located at the bottom of the linear polarizer orientation calibration device 1 facing the digital human acquisition, and forms a bottom support. The light-emitting element 11, the second polarizer 13, the first polarizer 12, and the photosensitive element 15 are distributed from left to right on the mounting base 17. Any two of the four structural components can be moved closer to or further away from each other, thus adjusting the mounting distance and increasing the testing calibration conditions.

[0045] In some embodiments, the photosensitive element 15, the light-emitting element 11, the first polarizer 12, and the second polarizer 13 are all connected to a movable rod 16 at their bottom, and the lower end of the movable rod 16 is slidably engaged with the mounting base 17. Figures 1-2 As shown, the movable rod 16 extends vertically, and the upper end of each movable rod 16 is connected to the bottom of the four structural members, and the lower end of the movable rod 16 is slidably engaged with the mounting base 17, so that the movable rod 16 drives the corresponding structural member above to slide relative to the mounting base 17.

[0046] Specifically, the bottom of the movable rod 16 is provided with a sliding guide rail, and the mounting base 17 is provided with a sliding groove 171. The extension direction of the sliding groove 171 is the same as the arrangement direction of the light-emitting element 11 and the photosensitive element 15. The sliding guide rail is slidably installed in the sliding groove 171 so that each structural component can slide relative to the mounting base 17 at the sliding groove 171, thereby realizing the spacing between two adjacent structural components and flexibly adjusting the polarization effect of the polarizer 14.

[0047] Among them, such as Figure 1 and Figure 2 As shown, the sliding groove 171 has an inverted T-shaped cross section. Similarly, the bottom of the movable rod 16 can be set as an inverted T-shaped structure so that after the movable rod 16 is slidably installed in the sliding groove 171, the mounting base 17 can limit the movable rod 16 so that the movable rod 16 is in a stable structural state, thereby ensuring that the position of each structural component relative to the mounting base 17 can be flexibly and smoothly adjusted.

[0048] This invention also proposes a method for calibrating the orientation of a linear polarizer for digital human data acquisition.

[0049] The linear polarizer orientation calibration method for digital human acquisition according to embodiments of the present invention is applicable to the linear polarizer orientation calibration device 1 for digital human acquisition in any of the above embodiments. The linear polarizer orientation calibration method for digital human acquisition includes:

[0050] S1: Install photosensitive element 15, light-emitting element 11, first polarizer 12 and second polarizer 13;

[0051] S2: Adjust the first polarizing frame 12 and the second polarizing frame 13 to the initial angle;

[0052] S3: Fix the first polarizing frame 12, adjust the angle of the second polarizing frame 13, and record the measurement results of the photosensitive element 15;

[0053] S4: Adjust the polarization direction of the second polarizer 13 to the angle that minimizes the light intensity, so that the polarization directions of the polarizers 14 corresponding to the first polarizer 12 and the second polarizer 13 are perpendicular to each other.

[0054] S5: Rotate the second polarizing frame 13 around the center by 45° relative to the third and fourth axes, respectively;

[0055] S6: Rotate the first polarizer 12 and the second polarizer 13 around their own center with the same angular velocity and in the same direction, and record the measurement results of the photosensitive element 15;

[0056] S7: Adjust both the first polarizer 12 and the second polarizer 13 to the angle with the minimum light intensity, and lock the polarizer 14.

[0057] Specifically, in actual execution, the photosensitive element 15, the light-emitting element 11, the first polarizer 12, and the second polarizer 13 are mounted on the mounting base 17, and the first polarizer 12 and the second polarizer 13 are adjusted to such a position. Figure 1 The angles and positions shown are as follows: the polarizer 13 is closer to the light-emitting element 11, and the polarizer 12 is closer to the photosensitive element 15. The polarizer 14 on the first polarizer 12 is denoted as P1, and the polarizer 14 on the second polarizer 13 is denoted as P2. Further, P1 is fixed, and the second polarizer 13 is adjusted by rotating P2 around an axis with the center as the origin and perpendicular to the plane containing the polarizer 14. The angle between the polarization directions of the two polarizers 14 is adjusted by rotating P2 around an axis perpendicular to the plane containing the polarizer 14. The light intensity transmitted through the two polarizers 14 is measured and recorded by the photosensitive element 15. After the measurement, the polarization direction of P2 is adjusted to the angle that minimizes the light intensity, at which point the polarization directions of the two polarizers 14 are perpendicular to each other.

[0058] Adjust the position of P2, and rotate the second polarizing frame 13 by 45° around the center of P2 as the origin, along each of the two axes on the plane where P2 is located, to obtain... Figure 2 The state of the polarizer 14 is shown in the image (here, the position of the polarizer 14 holder). Rotate P1 and P2 around the center of polarizer 14 in the same direction and at the same angular velocity (here, the polarization direction of polarizer 14). Measure and record the light intensity transmitted through the two polarizers 14 using the photosensitive element 15. After measurement, adjust P1 and P2 to the angle of minimum light intensity. At this point, the polarization direction of P1 is perpendicular to the horizontal plane of polarizer 14 holder, and the polarization direction of P2 is parallel to the horizontal direction of polarizer 14 holder. Lock polarizer 14 holder in place. Through the above steps, the direction of the linear polarizer 14 can be measured and calibrated. The operation is simple and easy to implement.

[0059] 1. In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0060] 2. In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0061] 3. In the description of this invention, "a plurality of" means two or more.

[0062] 4. In the description of the present invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0063] 5. In the description of the present invention, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0065] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A linear polarizer orientation calibration device for digital human data acquisition, characterized in that, include: Photosensitive element; A light-emitting element is arranged opposite to the photosensitive element, and the light-emitting element is used to emit a multispectral dynamic acquisition light source; A first polarizing frame and a second polarizing frame, both equipped with polarizers, are sequentially spaced apart between the photosensitive element and the light-emitting element. The first polarizing frame is configured to rotate synchronously around a first rotation axis and a second rotation axis, and the second polarizing frame is configured to rotate synchronously around a third rotation axis and a fourth rotation axis. The first and third rotation axes are spatially staggered and arranged in a non-coplanar manner, as are the second and fourth rotation axes, to achieve dynamic calibration of polarization direction under non-collinear optical axes of multiple cameras in digital human acquisition.

2. The linear polarizer orientation calibration device for digital human acquisition according to claim 1, characterized in that, Also includes: A first driving member and a second driving member, wherein the first driving member is connected to the first polarizing frame and is used to drive the first polarizing frame to rotate, and the second driving member is connected to the second polarizing frame and is used to drive the second polarizing frame to rotate.

3. The linear polarizer orientation calibration device for digital human data acquisition according to claim 2, characterized in that, Both the first driving element and the second driving element are constructed as electrically driven elements.

4. The linear polarizer orientation calibration device for digital human acquisition according to claim 1, characterized in that, It also includes a mounting base, on which the photosensitive element, the light-emitting element, the first polarizing frame, and the second polarizing frame can all be movably mounted, and the spacing between any two of the photosensitive element, the light-emitting element, the first polarizing frame, and the second polarizing frame is adjustable.

5. The linear polarizer orientation calibration device for digital human acquisition according to claim 4, characterized in that, The photosensitive element, the light-emitting element, the first polarizing frame, and the second polarizing frame are all connected to a movable rod at the bottom, and the lower end of the movable rod is slidably engaged with the mounting base.

6. The linear polarizer orientation calibration device for digital human acquisition according to claim 5, characterized in that, The bottom of the movable rod is provided with a sliding guide rail, and the mounting base is provided with a sliding groove. The extending direction of the sliding groove is the same as the arrangement direction of the light-emitting element and the photosensitive element. The sliding guide rail is slidably installed in the sliding groove.

7. A method for calibrating the orientation of a linear polarizer for digital human data acquisition, characterized in that, A linear polarizer orientation calibration device applicable to digital human acquisition according to any one of claims 1-6, wherein the linear polarizer orientation calibration method for digital human acquisition includes: Install a photosensitive element, a light-emitting element, a first polarizing frame, and a second polarizing frame; Adjust the first polarizing frame and the second polarizing frame to the initial angle; The first polarizing frame is fixed, the angle of the second polarizing frame is adjusted, and the measurement results of the photosensitive element are recorded. The polarization direction of the second polarizer is adjusted to the angle that minimizes the light intensity, so that the polarization directions of the polarizers corresponding to the first polarizer and the second polarizer are perpendicular to each other; The second polarizing frame is rotated 45° around the center relative to the third and fourth axes, respectively. The first polarizing frame and the second polarizing frame are rotated around their own center with the same angular velocity and in the same direction, and the measurement results of the photosensitive element are recorded. Adjust both the first polarizer and the second polarizer to the angle of minimum light intensity, and lock the polarizer.

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