Polarizing device light-transmitting axis calibration device and polarizing device light-transmitting axis calibration method

Abstract

According to the calibration device and method for the light-transmitting axis of the polarization device, the light-transmitting axis of the polarization device is calibrated by means of the wire grid polaroid and by utilizing the rotating motor to drive the polarization device to rotate, and in the process that the rotating motor drives the deflection device to rotate, if the measured optical power is minimum, the light-transmitting axis of the polarization device is calibrated. If yes, the depiction direction of the wire grid polaroid is parallel to the direction of the light-transmitting axis of the polarization device, and on the basis, in the calibration process, the included angle phi between the wire grid depiction direction of the wire grid polaroid and the mechanical reference is measured, and the included angle alpha between the light-transmitting axis mark of the polarization device and the mechanical reference is measured; the rotating angle theta of the rotating motor is recorded when the optical power value is minimum, then the angle of the light-transmitting axis of the polarization device relative to the light-transmitting axis mark can be calculated through phi, alpha and theta, calibration of the light-transmitting axis of the polarization device can be completed, and the operation process is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of polarization device calibration, and in particular to a polarization device transmission axis calibration device and a polarization device transmission axis calibration method. Background Art

[0002] In actual use, in order to meet the use requirements, it is usually necessary to adjust the light transmission axis of polarization devices such as polarizers and polarizing prisms to a specific installation angle and the installation accuracy is required to be high.

[0003] Since the optical properties of the transmission axis of all products are not measured and calibrated during the mass production and manufacturing of polarization devices, the error between the transmission axis mark and the actual transmission axis position is large and cannot meet the accuracy requirements. Therefore, it is necessary to calibrate the transmission axis of the polarization device. Summary of the invention

[0004] The object of the present invention is to provide a polarization device transmission axis calibration device and a polarization device transmission axis calibration method, so as to realize the calibration of the polarization device transmission axis and improve the use accuracy of the polarization device.

[0005] In order to solve the above technical problems, the present invention provides a polarization device transmission axis calibration device, comprising: a wire grid polarizer, a mechanical plate with a mechanical reference, a rotating motor, an optical power meter and an angle detection unit;

[0006] The wire grid polarizer and the mechanical sheet both extend along a first direction, and the wire grid polarizer, the rotating motor, the mechanical sheet and the optical power meter are sequentially arranged along a second direction, and the second direction is perpendicular to the first direction;

[0007] The rotating motor has a bearing surface extending along the first direction, so as to bear the polarization device, and drives the polarization device to rotate by rotating in the first direction;

[0008] The optical power meter is used to detect the optical power value of the collimated light after it passes through the wire grid polarizer and the polarization device in sequence;

[0009] The angle detection unit is used to measure the angle Φ between the wire grid depiction direction of the wire grid polarizer and the mechanical reference in the first direction, the angle α between the light transmission axis mark of the polarization device and the mechanical reference in the first direction, and the rotation angle of the motor;

[0010] The included angle Φ, the included angle α, the rotation angle and the optical power value are used to calibrate the light transmission axis of the polarization device.

[0011] Optionally, in the polarization device transmission axis calibration device, the polarization device transmission axis calibration device further includes a calculation unit, and the calculation unit is used to perform the following steps:

[0012] During the rotation of the rotating motor, the measured rotation angle and the corresponding measured optical power value are acquired in real time, and the corresponding relationship between the optical power value and the rotation angle is calculated;

[0013] Obtaining the angle Φ and the rotation angle θ when the optical power value is minimum, and obtaining the angle α0 between the light transmission axis mark of the polarization device and the mechanical reference in the first direction before the rotating motor rotates; and

[0014] The angle of the light transmission axis of the polarizing device relative to the light transmission axis mark is calculated according to the rotation angle θ, the included angle Φ and the included angle α0, so as to complete the calibration of the light transmission axis of the polarizing device.

[0015] Optionally, in the polarization device transmission axis calibration device, the step of the calculation unit calculating the angle of the transmission axis of the polarization device relative to the transmission axis mark according to the rotation angle θ, the included angle Φ and the included angle α0 includes:

[0016] An angle α1 between the light transmission axis mark of the polarizing device and the mechanical reference in the first direction after the rotating motor rotates by the angle θ is calculated according to the rotation angle θ and the angle α0; and

[0017] The angle of the transmission axis of the polarizing device relative to the transmission axis mark is calculated according to Φ-α1 to complete the calibration of the transmission axis of the polarizing device.

[0018] Optionally, in the polarization device transmission axis calibration device, it is characterized in that:

[0019] If the rotation direction of the rotating motor is the same as the direction of the light-transmitting axis mark relative to the mechanical reference, then α1=α0+θ;

[0020] If the rotation direction of the rotating motor is opposite to the direction of the light-transmitting axis mark relative to the mechanical reference, then α1 = α0 - θ.

[0021] Optionally, in the polarization device transmission axis calibration device, the transmission axis calibration device further includes a laser, and the laser is used to output collimated light toward the wire grid polarizer along the second direction.

[0022] Optionally, in the polarization device transmission axis calibration device, the angle detection unit includes an imager, and the imager is used to measure the angle Φ and the angle α.

[0023] Optionally, in the polarization device transmission axis calibration device, the polarization device transmission axis calibration device also includes a mounting seat, and the mounting seat is used to install the wire grid polarizer, so that the wire grid polarizer and the mechanical plate are spaced apart in the second direction to form a spacing space, and the rotating motor is located in the spacing space.

[0024] Optionally, in the polarization device transmission axis calibration device, the mounting seat has a positioning structure, and the positioning structure is used to limit the movement of the wire grid polarizer in the first direction.

[0025] Optionally, in the polarization device transmission axis calibration device, the mechanical sheet is provided with two marks, and a line connecting the two marks constitutes the mechanical reference.

[0026] The present invention also provides a method for calibrating the transmission axis of a polarization device, using the device for calibrating the transmission axis of a polarization device as described in any of the preceding items, comprising the following steps:

[0027] Measuring the angle Φ between the wire grid depiction direction of the wire grid polarizer and the mechanical reference, and measuring the angle α0 between the transmission axis mark of the polarizing device and the mechanical reference;

[0028] Controlling the rotation of the rotating motor to drive the polarization device to rotate, during the rotation of the rotating motor, detecting in real time the rotation angle of the rotating motor and the corresponding optical power value measured by the optical power meter, and calculating the corresponding relationship between the optical power value and the rotation angle;

[0029] Record the rotation angle θ corresponding to the minimum optical power value;

[0030] The angle of the light transmission axis of the polarizing device relative to the light transmission axis mark is calculated according to the rotation angle θ, the included angle Φ and the included angle α0, so as to complete the calibration of the light transmission axis of the polarizing device.

[0031] Optionally, in the polarization device transmission axis calibration method,

[0032] If the rotation direction of the rotating motor is the same as the direction of the light transmission axis mark relative to the mechanical reference, the angle of the light transmission axis of the polarizing device relative to the light transmission axis mark is calculated using Φ-(α0+θ);

[0033] If the rotation direction of the rotating motor is opposite to the direction of the transmission axis mark relative to the mechanical reference, the angle of the transmission axis of the polarizing element relative to the transmission axis mark is calculated using Φ-(α0-θ).

[0034] In summary, the polarization device transmission axis calibration device and method provided by the present invention calibrate the transmission axis of the polarization device by means of a wire grid polarizer and a rotating motor to drive the polarization device to rotate. During the process of the rotating motor driving the deflection device to rotate, if the measured light power is minimum, it means that the engraving direction of the wire grid polarizer is parallel to the direction of the transmission axis of the polarization device. Based on this, during the calibration process, the angle Φ between the wire grid engraving direction of the wire grid polarizer and the mechanical reference is measured, the angle α between the transmission axis mark of the polarization device and the mechanical reference is measured, and the rotation angle θ of the rotating motor when the light power value is minimum is recorded. Then, Φ, α and θ can be used to calculate the angle of the transmission axis of the polarization device relative to the transmission axis mark, thereby completing the calibration of the transmission axis of the polarization device, and the operation process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the structure of a device for calibrating the transmission axis of a polarization device provided in an embodiment of the present invention;

[0036] Figure 2 A flow chart of a device for calibrating the transmission axis of a polarization device provided in an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the angle between the wire grid depiction direction and the mechanical reference in an embodiment of the present invention;

[0038] Figure 4 A schematic diagram of the angle between the light-transmitting mark of the polarization device and the mechanical reference in an embodiment of the present invention;

[0039] Figure 5 is a diagram showing the corresponding relationship between the optical power value and the rotation angle in an embodiment of the present invention;

[0040] Figure 6 Schematic diagram of the positional relationship among the light-transmitting mark, the mechanical reference and the wire grid depiction direction in an embodiment of the present invention;

[0041] The descriptions of the reference numerals are as follows:

[0042] 1-Laser; 2-Wire grid polarizer; 3-Mounting seat; 4-Mechanical plate; 5-Rotating motor; 6-Optical power meter. DETAILED DESCRIPTION

[0043] In order to make the purpose, advantages and features of the present invention clearer, the present invention is described in detail in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis of each drawing is different, and sometimes different proportions are used. It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are only used to distinguish the various components, elements, steps, etc. in the specification, and are not used to represent the logical relationship or sequential relationship between the various components, elements, steps, etc.

[0044] like Figure 1 As shown, an embodiment of the present invention provides a polarization device transmission axis calibration device, which includes: a wire grid polarizer 2, a mechanical plate 4 with a mechanical reference, a rotating motor 5, an optical power meter 6 and an angle detection unit (not shown).

[0045] The wire grid polarizer 2 and the mechanical sheet 4 are both extended along a first direction, and the wire grid polarizer 2, the rotating motor 5, the mechanical sheet 4 and the optical power meter 6 are sequentially arranged along a second direction, and the second direction is perpendicular to the first direction. Figure 1 As shown in , the first direction refers to the horizontal direction, and the second direction refers to the vertical direction, but the present application is not limited thereto.

[0046] The rotating motor 5 has a bearing surface extending along the first direction for bearing the polarization device and drives the polarization device to rotate by rotating in the first direction. The optical power meter 6 is used to detect the optical power value of the collimated light after passing through the wire grid polarizer 2 and the polarization device in sequence.

[0047] The angle detection unit is used to measure the angle Φ between the wire grid depiction direction of the wire grid polarizer 2 and the mechanical reference in the first direction, the angle α between the transmission axis mark of the polarization device and the mechanical reference in the first direction, and the rotation angle θ of the motor.

[0048] The angle detection unit may include an imager, through which the angle Φ and the angle α are measured. In addition, the angle detection unit may also include an angle sensor, which is used to detect the rotation angle of the rotating motor 5. The mechanical reference may be formed by setting a mark on the mechanical sheet 4, for example, Figure 3 As shown in , the mechanical sheet 4 is provided with two marks, and the connecting line of the two marks constitutes the mechanical reference.

[0049] Please continue to see Figure 1Optionally, the transmission axis calibration device also includes a laser 1, which is used to output collimated light along the second direction toward the wire grid polarizer 2, and the output collimated light passes through the wire grid polarizer 2 and the polarization device carried by the rotating motor 5 in sequence.

[0050] In addition, the polarization device transmission axis calibration device may also include a mounting seat 3, through which the wire grid polarizer 2 is mounted, so that the wire grid polarizer 2 and the mechanical sheet 4 are spaced apart in the second direction to form a spacing space, and the rotating motor 5 is located in the spacing space, so that the wire grid polarizer 2, the polarization device and the mechanical sheet 4 form a positional relationship of stacking in sequence from top to bottom. Preferably, the mounting seat 3 has a positioning structure, and the positioning structure is used to limit the movement of the wire grid polarizer 2 in the first direction, so as to avoid the calibration accuracy being deteriorated due to the change of the angle between the wire grid engraving direction of the wire grid polarizer 2 and the mechanical reference caused by the movement of the wire grid polarizer 2 during the calibration process. Further preferably, the positioning structure is a groove to facilitate the positioning and limiting of the wire grid polarizer 2. For the wire grid polarizer 2, the wire grid drawing direction is perpendicular to the transmission polarization direction (wire grid light transmission axis), so when the rotating motor 5 drives the polarizer to rotate until its light transmission axis mark is parallel to the wire grid drawing direction of the wire grid polarizer 2, the optical power value detected by the optical power meter 6 is minimum. Based on this, the rotation angle θ of the motor corresponding to the minimum light power value detected by the optical power meter 6 can be obtained, and the angle of the light transmission axis of the polarizer relative to the light transmission axis mark can be calculated in combination with the measured angle Φ and the angle α, so as to complete the calibration of the light transmission axis of the polarizer.

[0051] The polarization device transmission axis calibration device provided in the embodiment of the present invention may further include a calculation unit, and the calculation unit is used to perform the following steps:

[0052] During the rotation of the rotating motor 5, the measured rotation angle and the corresponding measured optical power value are acquired in real time, and the corresponding relationship between the optical power value and the rotation angle is calculated;

[0053] Acquire the angle Φ, the rotation angle θ when the optical power value is minimum, and the angle α0 between the light transmission axis mark of the polarization device and the mechanical reference in the first direction before the rotating motor 5 rotates; and,

[0054] The angle of the light transmission axis of the polarizing device relative to the light transmission axis mark is calculated according to the rotation angle θ, the included angle Φ and the included angle α0, so as to complete the calibration of the light transmission axis of the polarizing device.

[0055] Specifically, the step of the calculation unit calculating the angle of the light transmission axis of the polarization device relative to the light transmission axis mark according to the rotation angle θ, the included angle Φ and the included angle α0 comprises:

[0056] According to the rotation angle θ and the included angle α0, an included angle α1 between the light transmission axis mark of the polarizing device and the mechanical reference in the first direction after the rotating motor 5 rotates by the angle θ is calculated; and

[0057] The angle of the transmission axis of the polarizing device relative to the transmission axis mark is calculated according to Φ-α1 to complete the calibration of the transmission axis of the polarizing device.

[0058] Among them, if the rotation direction of the rotating motor 5 is the same as the direction of the transparent axis mark relative to the mechanical reference, then α1=α0+θ; if the rotation direction of the rotating motor 5 is opposite to the direction of the transparent axis mark relative to the mechanical reference, then α1=α0-θ.

[0059] The reason why the angle of the light transmission axis of the polarizing device relative to the light transmission axis mark can be calculated based on the rotation angle θ, the included angle Φ and the included angle α0 is mainly because:

[0060] (1) If the optical power value measured by the optical power meter 6 is the smallest when the rotation angle of the rotating motor 5 is θ, it means that after the rotating motor 5 rotates by the angle θ, the light transmission axis mark of the polarizing device is parallel to the line grid drawing direction of the line grid polarizer 2. Therefore, the measured angle Φ between the line grid drawing direction and the mechanical reference is the angle between the light transmission axis of the current polarizing device and the mechanical reference.

[0061] (2) The angle between the light transmission axis mark of the polarization device and the mechanical reference changes with the rotation of the rotating motor 5. If the angle between the light transmission axis mark of the polarization device and the mechanical reference is α before the rotating motor 5 rotates, then after the rotating motor 5 rotates by an angle θ, as the rotation direction changes, the difference or addition of the two angles is the angle between the light transmission axis mark of the polarization device and the mechanical reference after the rotating motor 5 rotates by an angle θ.

[0062] (3) After calculating the angle between the light transmission axis of the polarizer and the mechanical reference, as well as the angle between the light transmission axis mark of the current polarizer and the mechanical reference, since both are angles relative to the mechanical reference, the angle between the light transmission axis of the polarizer and the light transmission axis mark can be obtained through simple conversion.

[0063] The polarization device transmission axis calibration device provided in this embodiment can use the calculation unit to realize automatic calibration after obtaining corresponding data through measurement. Since the calculation unit performs the above calibration process without human intervention, the operation is simple and efficient.

[0064] Correspondingly, the embodiment of the present invention further provides a method for calibrating the transmission axis of a polarization device, using the device for calibrating the transmission axis of a polarization device provided in this embodiment, such as Figure 2 As shown, the method comprises the following steps:

[0065] S1, measuring the angle Φ between the wire grid depiction direction of the wire grid polarizer 2 and the mechanical reference, and measuring the angle α0 between the transmission axis mark of the polarization device and the mechanical reference;

[0066] S2, controlling the rotation of the rotating motor 5 to drive the polarization device to rotate, during the rotation of the rotating motor 5, detecting in real time the rotation angle of the rotating motor 5 and the optical power value measured by the optical power meter 6, and calculating the corresponding relationship between the optical power value and the rotation angle;

[0067] S3, recording the rotation angle θ corresponding to the minimum optical power value;

[0068] S4, calculating the angle of the transmission axis of the polarizing device relative to the transmission axis mark according to the rotation angle θ, the included angle Φ and the included angle α0, so as to complete the calibration of the transmission axis of the polarizing device.

[0069] Among them, if the rotation direction of the rotating motor 5 is the same as the direction of the transmission axis mark relative to the mechanical reference, Φ-(α0+θ) is used to calculate the angle of the transmission axis of the polarization device relative to the transmission axis mark; if the rotation direction of the rotating motor 5 is opposite to the direction of the transmission axis mark relative to the mechanical reference, Φ-(α0-θ) is used to calculate the angle of the transmission axis of the polarization device relative to the transmission axis mark.

[0070] In the steps S2, S3 and S4, the calculation part after obtaining the corresponding data can be completed by the calculation unit without human intervention.

[0071] As a specific example, Figure 3 As shown, after the wire grid polarizer 2 is connected to the mechanical plate 4 with a mechanical reference through the mounting base 3, the angle between the wire grid line drawing direction and the mechanical reference a is measured by an imager as Φ; and Figure 4As shown, the polarization device to be tested is placed on the rotating motor 5, and the angle between the transmission axis mark c of the polarization device to be tested and the mechanical reference a is measured by an imager to be α0, and the transmission axis mark c of the polarization device to be tested is in the counterclockwise direction of the mechanical reference a.

[0072] Then, the rotating motor 5 is controlled to rotate in the counterclockwise direction to drive the polarization device to be measured to rotate in the counterclockwise direction. During the rotation process, the rotation angle and the optical power measured by the optical power meter 6 at the rotation angle are recorded to obtain the corresponding relationship between the optical power value and the rotation angle as shown in FIG. Figure 5 When the measured optical power is the lowest, it means that the light transmission axis of the polarization device to be measured is parallel to the drawing direction of the wire grid. At this time, the angle corresponding to the rotating motor 5 is θ, as shown in Figure 6 As shown in the figure, the initial position of the light transmission axis mark of the polarization device to be tested is at position c. After the rotating motor 5 rotates by angle θ, the light transmission axis mark of the polarization device to be tested changes to position c'. The angle between the light transmission axis mark of the polarization device to be tested and the mechanical reference is α0+θ. Φ-(θ+α0) is the angle of the light transmission axis relative to the light transmission axis mark c when the polarization device is installed.

[0073] In some other embodiments, after obtaining the rotation angle θ corresponding to the minimum optical power value measured by the optical power meter 6, the rotary motor 5 can be controlled to rotate the same angle θ again, and the angle α1 between the light transmission axis mark of the polarizer and the mechanical reference in the first direction after the rotation angle θ is directly measured, and then the angle of the light transmission axis of the polarizer relative to the light transmission axis mark is calculated according to Φ-α1 to complete the calibration of the light transmission axis of the polarizer. In this embodiment, when calculating the relative angle, it is not necessary to consider whether the rotation direction of the rotary motor 5 is the same as or different from the direction of the light transmission axis mark relative to the mechanical reference, and direct measurement is sufficient. However, since the actual rotation angle of the rotary motor 5 may be different when the rotary motor 5 rotates twice, it will affect the calibration accuracy to a certain extent, and multiple operations will increase the complexity of the operation and affect the calibration efficiency. Therefore, it is preferred to calculate the angle of the light transmission axis of the polarizer relative to the light transmission axis mark according to the angle α0 between the light transmission axis mark of the polarizer and the mechanical reference in the first direction before the rotary motor 5 rotates.

[0074] In summary, the polarization device transmission axis calibration device and method provided by the present invention calibrate the transmission axis of the polarization device by means of a wire grid polarizer and a rotating motor to drive the polarization device to rotate. During the process of the rotating motor driving the deflection device to rotate, if the measured light power is minimum, it means that the engraving direction of the wire grid polarizer is parallel to the direction of the transmission axis of the polarization device. Based on this, during the calibration process, the angle Φ between the wire grid engraving direction of the wire grid polarizer and the mechanical reference is measured, the angle α between the transmission axis mark of the polarization device and the mechanical reference is measured, and the rotation angle θ of the rotating motor when the light power value is minimum is recorded. Then, Φ, α and θ can be used to calculate the angle of the transmission axis of the polarization device relative to the transmission axis mark, thereby completing the calibration of the transmission axis of the polarization device, and the operation process is simple.

[0075] In addition, it should be recognized that although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still belongs to the scope of protection of the technical solution of the present invention.

Claims

1. A polarization device transmission axis calibration device, characterized in that: include: Wire grid polarizer, mechanical plate with mechanical reference, rotating motor, optical power meter and angle detection unit; The wire grid polarizer and the mechanical sheet both extend along a first direction, and the wire grid polarizer, the rotating motor, the mechanical sheet and the optical power meter are sequentially arranged along a second direction, and the second direction is perpendicular to the first direction; The rotating motor has a bearing surface extending along the first direction, so as to bear the polarization device, and drives the polarization device to rotate by rotating in the first direction; The optical power meter is used to detect the optical power value of the collimated light after it passes through the wire grid polarizer and the polarization device in sequence; The angle detection unit is used to measure the angle Φ between the wire grid depiction direction of the wire grid polarizer and the mechanical reference in the first direction, the angle α between the light transmission axis mark of the polarization device and the mechanical reference in the first direction, and the rotation angle of the motor; The included angle Φ, the included angle α, the rotation angle and the optical power value are used to calibrate the light transmission axis of the polarization device.

2. The polarization device transmission axis calibration device according to claim 1, characterized in that: The polarization device transmission axis calibration device further includes a calculation unit, which is used to perform the following steps: During the rotation of the rotating motor, the measured rotation angle and the corresponding measured optical power value are acquired in real time, and the corresponding relationship between the optical power value and the rotation angle is calculated; Obtaining the angle Φ and the rotation angle θ when the optical power value is minimum, and obtaining the angle α0 between the light transmission axis mark of the polarization device and the mechanical reference in the first direction before the rotating motor rotates; as well as, The angle of the light transmission axis of the polarizing device relative to the light transmission axis mark is calculated according to the rotation angle θ, the included angle Φ and the included angle α0, so as to complete the calibration of the light transmission axis of the polarizing device.

3. The polarization device transmission axis calibration device according to claim 2, characterized in that: The step of the calculation unit calculating the angle of the light transmission axis of the polarization device relative to the light transmission axis mark according to the rotation angle θ, the included angle Φ and the included angle α0 comprises: An angle α1 between the light transmission axis mark of the polarizing device and the mechanical reference in the first direction after the rotating motor rotates by the angle θ is calculated according to the rotation angle θ and the angle α0; and The angle of the transmission axis of the polarizing device relative to the transmission axis mark is calculated according to Φ-α1 to complete the calibration of the transmission axis of the polarizing device.

4. The polarization device transmission axis calibration device according to claim 3, characterized in that: If the rotation direction of the rotating motor is the same as the direction of the light-transmitting axis mark relative to the mechanical reference, then α1=α0+θ; If the rotation direction of the rotating motor is opposite to the direction of the light-transmitting axis mark relative to the mechanical reference, then α1 = α0 - θ.

5. The transmission axis calibration device for a polarization device as described in claim 1, characterized in that the transmission axis calibration device also includes a laser, and the laser is used to output collimated light toward the wire grid polarizer along the second direction.

6. The polarization device transmission axis calibration device according to claim 1, characterized in that: The angle detection unit includes an imager, and the imager is used to measure the included angle Φ and the included angle α.

7. The polarization device transmission axis calibration device according to claim 1, characterized in that: The polarization device transmission axis calibration device also includes a mounting seat, which is used to mount the wire grid polarizer, so that the wire grid polarizer and the mechanical plate are spaced apart in the second direction to form a spacing space, and the rotating motor is located in the spacing space.

8. The polarization device transmission axis calibration device according to claim 7, characterized in that: The mounting seat has a positioning structure, and the positioning structure is used to limit the movement of the wire grid polarizer in the first direction.

9. The polarization device transmission axis calibration device according to claim 1, characterized in that: The mechanical sheet is provided with two marks, and a line connecting the two marks constitutes the mechanical reference.

10. A method for calibrating the transmission axis of a polarization device, using the device for calibrating the transmission axis of a polarization device as claimed in any one of claims 1 to 9, characterized in that: The steps include: Measuring the angle Φ between the wire grid depiction direction of the wire grid polarizer and the mechanical reference, and measuring the angle α0 between the transmission axis mark of the polarizing device and the mechanical reference; Controlling the rotation of the rotating motor to drive the polarization device to rotate, during the rotation of the rotating motor, detecting in real time the rotation angle of the rotating motor and the corresponding optical power value measured by the optical power meter, and calculating the corresponding relationship between the optical power value and the rotation angle; Record the rotation angle θ corresponding to the minimum optical power value; The angle of the light transmission axis of the polarizing device relative to the light transmission axis mark is calculated according to the rotation angle θ, the included angle Φ and the included angle α0, so as to complete the calibration of the light transmission axis of the polarizing device.

11. The method for calibrating the transmission axis of a polarization device according to claim 10, characterized in that: If the rotation direction of the rotating motor is the same as the direction of the light transmission axis mark relative to the mechanical reference, the angle of the light transmission axis of the polarizing device relative to the light transmission axis mark is calculated using Φ-(α0+θ); If the rotation direction of the rotating motor is opposite to the direction of the transmission axis mark relative to the mechanical reference, the angle of the transmission axis of the polarizing element relative to the transmission axis mark is calculated using Φ-(α0-θ).

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