Adjusting device for polarization measurement beam splitting system

Abstract

The invention relates to the technical field of astronomical instruments, and discloses a polarization measurement beam splitting system adjusting device which is provided with three beam splitting prisms which are used for splitting incident light into two beams of linearly polarized light, namely P polarized light and S polarized light, the polarization directions of the two beams of linearly polarized light are orthogonal, and the prisms are placed at a certain interval. The prisms need to be in a certain angle corresponding relation in the placing process. The device covers optional adjustment of three dimensions of pitching, rotation and deflection of the three prisms, the angle corresponding relation of the three beam splitting prisms in space can be found only through precise screw adjustment, and the device can keep a stable beam splitting effect when the telescope is in any observation attitude without translation adjustment for compensation. The telescope has the advantage of being light in structure, and unnecessary deflection caused by overweight of the telescope can be effectively reduced; the hollow frame type design is adopted, observability and debugging are convenient, the structural rigidity is good, and deflection deformation meeting the optical requirement can be resisted.

Description

Technical Field

[0001] The invention relates to the technical field of astronomical instruments, and in particular to a polarization measurement spectroscopic system adjustment device. Background Art

[0002] Radiation polarization remote sensing measurement is a conventional measurement method for the magnetic field of celestial bodies including the sun. The detection of the solar coronal magnetic field is based on the radiation characteristics of the region, especially the polarization characteristics of the radiation, and the magnetic field information is obtained by analyzing and inverting. In the scientific research telescopes used in the solar polarization research institute, the spectrometer is an indispensable component of the optical system. Usually, the back-end system of the telescope will divide the incident light into two parts: P polarized light and S polarized light, and then disperse the P polarized light and S polarized light respectively and collect the corresponding spectra. Usually, the whole set of scientific research equipment is also equipped with a calibration unit, a polarizer, an analyzer, etc. As the source of P polarized light and S polarized light, the linear polarization degree of the output light of the spectrometer system has a great influence on the accuracy of data demodulation.

[0003] From an engineering perspective, before the spectroscopic system, there are calibration units, modulation units, etc., and on the two optical branches after the spectroscopic system, there are imaging systems of their respective optical paths, etc. Therefore, the incident light has both incident angle requirements and axis penetration requirements for the spectroscopic system, that is, the incident light should be incident from the geometric center of the front end of the spectroscopic system, and after passing through the spectroscopic prism group, it should be emitted at the geometric center of each optical path to ensure the convenience of debugging of each subsystem. For the spectroscopic prism, although the incident light does not necessarily have to pass through the geometric center of the square, considering the convenience of debugging, passing through the geometric center is the easiest position to control for debugging. According to the optical design requirements, the three spectroscopic prisms are placed with the geometric center as a reference according to certain spacing requirements. When the light path can pass through the geometric center of the prism, it is only necessary to adjust the three rotation dimensions of the spectroscopic prism to find the corresponding angles between each other. Although the existing optical adjustment devices on the market can meet the rotation adjustment, such as the pitch adjustment table, there are the following problems:

[0004] (1) The rotation center of the pitch adjustment platform of existing products is difficult to fall on the geometric center of the prism square. When the rotation center and the geometric center do not coincide, a translation platform needs to be introduced to eliminate the coupling phenomenon;

[0005] (2) Even if the rotation center of the pitch adjustment platform of existing products coincides with the geometric center of the mirror block, the pitch adjustment platform of existing products is generally thick, so the rotation radius is large, which increases the volume and weight of the entire spectroscopic system, increases the weight of the rear end of the telescope, and causes excessive unnecessary bending;

[0006] (3) The adjustment knobs of the existing products are fixed in position. In the outer covering structure of the spectroscopic system, there may be obstacles in the adjustment position, which makes it difficult to start, and the manual adjustment effect is poor, which brings a lot of trouble in debugging. Especially when the spectroscopic system is assembled on the telescope, if there is a problem with the optical path, disassembly and reassembly for re-inspection will increase the workload and difficulty exponentially.

[0007] Therefore, a good spectroscopic system design should have the following characteristics:

[0008] (1) Accurate structural dimensions;

[0009] (2) The beam splitter prism only needs to be adjusted in three dimensions to complete the debugging;

[0010] (3) Since the entire spectroscopic system is mounted at the rear end of the telescope, its size and weight should be as small as possible to avoid introducing excessive bending;

[0011] (4) When the structure is compact, the ergonomics of debugging and rechecking should be considered. As the middle section of many subsystems at the back end of the telescope, after being assembled with the telescope, if there is a problem with the debugging of the large system, the spectroscopic system should have the feature of being able to complete rechecking and debugging conveniently without disassembly.

[0012] (5) Since other subsystems will be installed at the back end of the spectrometer system, the rigidity of the load-bearing structure must meet the optical design requirements. Summary of the invention

[0013] The present invention provides a polarization measurement spectroscopic system adjustment device. The purpose of the present invention is to improve the ergonomic efficiency and convenience of subsequent re-inspection of the polarization measurement spectroscopic system, and reduce the bending caused by the weight at the rear end of the telescope. The device has good ergonomic performance in the prism debugging of the spectroscopic system, simple debugging, good rigidity after installation, low weight, and small size. In the subsequent re-inspection work, it is only necessary to remove the cover plate to easily observe and achieve fine-tuning. After actual work tests, the design of the device is effective.

[0014] The technical solution adopted by the present invention is:

[0015] A polarization measurement spectroscopic system adjustment device, composed of a spectroscopic prism adjustment structure and a P polarized light reflector, a shading plate and an outer frame, wherein the spectroscopic prism adjustment structure includes three spectroscopic prisms, a rotation adjustment cantilever, a prism fixing frame, a prism fixing lower cover, a yaw adjustment plate, an adjustment base, a tightening screw group, a steel ball, a pitch adjustment group, a rotation adjustment group, a yaw adjustment group, a cantilever tightening spring and a yaw adjustment plate tightening spring, and the outer frame includes a frame and a frame crossbeam;

[0016] The three beam splitter prisms are divided into two groups, one beam splitter prism is the first group, and the other two beam splitter prisms are arranged side by side as the second group.

[0017] The incident light L is first split by the first beam splitter prism to form P polarized light and S polarized light respectively. The P polarized light and S polarized light are then emitted after passing through the second group beam splitter prisms on the left and rear sides of the first group beam splitter prism respectively to increase the polarization degree. Among them, the light P needs to pass through a reflector to change the emission direction. The emission direction of the S polarized light is set to the X direction, the incident light L is set to the Y direction, and the upward direction of the device is set to the Z direction, then the P polarized light is emitted from the opposite direction of the X direction.

[0018] The shading plates include an upper shading plate, a right shading plate, a front shading plate, a left shading plate, a rear shading plate and a lower shading plate.

[0019] The three dichroic prisms are clamped together by a prism fixing frame and a prism fixing lower cover, and fixed by a tightening screw group; the prism fixing frame is adapted and fixed on the rotation adjustment cantilever by a steel ball, a pitch adjustment group, a rotation adjustment group and a cantilever tension spring; the rotation adjustment cantilever is fixed on the yaw adjustment plate by screws.

[0020] The deflection adjustment plate is provided with arc-shaped edges on both sides that cooperate with the arc-shaped protrusions of the adjustment base to perform limited arc sliding motion on the deflection adjustment plate and the adjustment base. After the deflection adjustment group and the deflection adjustment plate tensioning spring are adapted, they are fixed on the deflection adjustment plate and the adjustment base to realize arc sliding adjustment.

[0021] The adjustment base, the P polarized light reflector, the frame crossbeam, the upper light shielding plate, the right light shielding plate, the front light shielding plate, the left light shielding plate, the rear light shielding plate and the lower light shielding plate are fixed on the frame by screws.

[0022] The prism fixing frame and the prism fixing lower cover both expose the incident surface, the reflection surface and the transmission surface when wrapping the beam splitter prism.

[0023] The pitch adjustment group and the rotation adjustment group are in contact with the rotation adjustment cantilever, and the rotation adjustment cantilever is engraved with a 1.5mm deep equilateral right triangle limit groove. The pitch adjustment group corresponds to the limit groove in the horizontal direction, and the rotation adjustment group corresponds to the limit groove in the vertical direction, to ensure that the rotation adjustment cantilever and the prism fixing frame are prevented from translational misalignment when the pitch adjustment group and the rotation adjustment group are rotated in and out.

[0024] The beam splitter prism is provided with three adjustment modes: pitch, yaw and rotation. The pitch adjustment group, the rotation adjustment group and the yaw adjustment group cooperate with the cantilever tension spring and the yaw adjustment plate tension spring to achieve three-dimensional adjustment of the beam splitter prism; the rotation centers of the three dimensions are all located at the cube geometric center of the prism.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. The three-dimensional rotation adjustment center of each beam splitter prism coincides with the geometric center of the beam splitter cube. When adjusting the rotation dimension, no displacement change will occur, and there is no need to introduce a displacement adjustment dimension, which greatly reduces the structural volume and weight of the prism adjustment, reduces the weight of the entire device, reduces the load on the telescope, and effectively reduces deflection.

[0027] 2. The outer frame of the present invention adopts a hollow frame design, and only the matching sleeve structure of the single beam splitter prism needs to be fixed on the bottom of the outer frame, which is convenient for installation. The hollow frame design has more operating space, is easy to adjust, has good ergonomic effect, light weight and good rigidity.

[0028] 3. The prism axis adjustment feedback is sensitive. The present invention has delicate adjustment, good optical feedback and is easy to adjust.

[0029] 4. The present invention has good structural stability. It has been confirmed through actual work that when the spectroscopic system changes with the various postures of the telescope, the geometric relationship of the prism will not undergo optically perceptible changes.

[0030] 5. The adjustment sequence of the present invention is reasonable. First adjust the first group of light prisms to achieve rough axis penetration, and then adjust the second group of light prisms to achieve fine axis penetration, and the entire debugging work is very easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 It is a structural schematic diagram of the present invention;

[0033] Figure 2 It is an explosion schematic diagram of the present invention;

[0034] Figure 3 is a side view of the present invention;

[0035] Figure 4 It is a front view of the present invention;

[0036] Figure 5 It is a schematic diagram of the circular arc sliding motion of the deflection adjustment plate and the adjustment base of the present invention.

[0037] Reference numerals:

[0038] 1-1 beam splitter prism; 1-2 rotation adjustment cantilever; 1-3 prism fixing frame; 1-4 prism fixing lower cover; 1-5 yaw adjustment plate; 1-6 adjustment base; 1-7 tightening screw group; 1-8 steel ball; 1-9 pitch adjustment group; 1-10 rotation adjustment group; 1-11 yaw adjustment group; 1-12 cantilever tension spring; 1-13 yaw adjustment plate tension spring; 2P polarized light reflector; 3-1 frame; 3-2 frame crossbeam; 4-1 upper shading plate; 4-2 right shading plate; 4-3 front shading plate; 4-4 left shading plate; 4-5 rear shading plate; 4-6 lower shading plate. DETAILED DESCRIPTION

[0039] In the following description, specific details such as specific system structures and technologies are provided for illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application can also be implemented in other embodiments without these specific details.

[0040] The beam splitter prism used in the present invention belongs to a polarization beam splitter prism (PBS), which can split an incident light beam into two beams of light with mutually perpendicular propagation directions, both of which are linearly polarized light, and the linear polarization directions of the two beams of light are mutually perpendicular. This beam splitter prism is usually composed of two equilateral right-angled triangular prisms whose hypotenuses are glued together, and a polarization beam splitting film is coated on the glued hypotenuse. The P polarized light (polarized light parallel to the incident plane) in the incident light is transmitted, while the S polarized light (polarized light perpendicular to the incident plane) is reflected. Since the polarization beam splitter prism has a certain transmittance: that is, there will be a certain amount of S polarized light transmitted in the direction of the P polarized light, this results in that when the incident light passes through only one beam splitter prism, the linear polarization degree of the P polarized light and the S polarized light is not high enough. In order to meet the needs of scientific research, a second group of beam splitters is added behind the transmission and to the left of the reflection of the first beam splitter prism to further improve the linear polarization degree of the P polarized light and the S polarized light, thereby improving the data accuracy.

[0041] like Figures 1 to 4As shown, this embodiment provides a polarization measurement spectroscopic system adjustment device, which is composed of a spectroscopic prism adjustment structure and a P polarized light reflector 2, a shading plate and an outer frame. The spectroscopic prism adjustment structure includes three spectroscopic prisms 1-1, a rotation adjustment cantilever 1-2, a prism fixing frame 1-3, a prism fixing lower cover 1-4, a yaw adjustment plate 1-5, an adjustment base 1-6, a tightening screw group 1-7, a steel ball 1-8, a pitch adjustment group 1-9, a rotation adjustment group 1-10, a yaw adjustment group 1-11, a cantilever tightening spring 1-12 and a yaw adjustment plate tightening spring 1-13, and the outer frame includes a frame 3-1 and a frame The beam 3-2 is mounted; the three beam splitters 1-1 are divided into two groups, one beam splitter prism is the first group, and the other two beam splitters 1-1 are arranged side by side as the second group. The incident light L is first split by the first beam splitter prism to form P polarized light and S polarized light respectively. The P polarized light and the S polarized light are then respectively passed through the second group beam splitter prisms on the left and rear sides of the first group beam splitter prism to increase the polarization degree and then emitted. Among them, the light P needs to pass through a reflector to change the emission direction. The emission direction of the S polarized light is set to the X direction, the incident light L is set to the Y direction, and the upward direction of the device is set to the Z direction, then the P polarized light is emitted from the opposite direction of the X direction.

[0042] The shading plates include an upper shading plate 4-1, a right shading plate 4-2, a front shading plate 4-3, a left shading plate 4-4, a rear shading plate 4-5 and a lower shading plate 4-6.

[0043] The three dichroic prisms 1-1 are clamped together by a prism fixing frame 1-3 and a prism fixing lower cover 1-4, and fixed by a tightening screw group 1-7; the prism fixing frame 1-3 is fixed on the rotation adjustment cantilever 1-2 by a steel ball 1-8, a pitch adjustment group 1-9, a rotation adjustment group 1-10 and a cantilever tensioning spring 1-12; the rotation adjustment cantilever 1-2 is fixed on the yaw adjustment plate 1-5 by screws.

[0044] like Figure 5 As shown, arc-shaped edges are provided on both sides of the yaw adjustment plate 1-5 to cooperate with the arc-shaped protrusions of the adjustment base 1-6, so as to perform limited arc sliding motion on the yaw adjustment plate 1-5 and the adjustment base 1-6. After the yaw adjustment group 1-11 and the yaw adjustment plate tensioning spring 1-13 are adapted, they are fixed on the yaw adjustment plate 1-5 and the adjustment base 1-6 to realize sliding adjustment within the arc.

[0045] The adjustment base 1-6, P polarized light reflector 2, frame crossbeam 3-2, upper shading plate 4-1, right shading plate 4-2, front shading plate 4-3, left shading plate 4-4, rear shading plate 4-5 and lower shading plate 4-6 are fixed on the frame 3-1 by screws.

[0046] When the prism fixing frame 1-3 and the prism fixing lower cover 1-4 wrap the beam splitter prism 1-1, the incident surface, the reflection surface and the transmission surface are exposed.

[0047] The pitch adjustment group 1-9 and the rotation adjustment group 1-10 are at the position where the rotation adjustment cantilever 1-2 contacts, and the rotation adjustment cantilever 1-2 is engraved with a 1.5mm deep equilateral right triangle limit groove, the pitch adjustment group 1-9 corresponding limit groove is in the horizontal direction, and the rotation adjustment group 1-10 corresponding limit groove is in the vertical direction, ensuring that the rotation adjustment cantilever 1-2 and the prism fixing frame 1-3 are prevented from translational misalignment when the pitch adjustment group 1-9 and the rotation adjustment group 1-10 are rotated in and out;

[0048] When the deflection adjustment group 1-11 is rotated in and out, it is not limited by the limit groove on the adjustment base 1-6.

[0049] The beam splitter prism 1-1 is provided with three adjustment modes of pitch, yaw and rotation. The pitch adjustment group 1-9, the rotation adjustment group 1-10 and the yaw adjustment group 1-11 cooperate with the cantilever tension spring 1-12 and the yaw adjustment plate tension spring 1-13 to realize three-dimensional adjustment of the beam splitter prism; the rotation centers of the three dimensions are all located at the cube geometric center of the prism.

[0050] The adjustment of the light splitting system is divided into three steps:

[0051] 1. Adjustment of the first set of prisms and rough threading; 2. Adjustment of the second set of prisms and fine threading; 3. Inspection and installation of telescope retest:

[0052] 1. Adjustment of the first prism and rough threading:

[0053] First, a fixed frame 3-1 is set up in the laboratory, and a point laser light source is set up to ensure that the laser light source passes through the geometric center of the circular flange surface at the incident end of the frame 3-1 and is perpendicular to it;

[0054] Confirm the geometric direction of the first beam splitter prism 1-1. The inclined surface of the first beam splitter prism 1-1 needs to face the circular flange surface at the incident end and the circular flange surface at the S-polarized light exit end of the frame 31. Install the first beam splitter prism 1-1 and its adjustment structure in the frame 31 and fix them. Draw crosshairs on the circular flange surface at the incident end, the square flange surface at the P-polarized light exit end, and the circular flange surface at the S-polarized light exit end of the frame 3-1, so that the corresponding crosshair intersection is located at the geometric center of the circular flange surface at the incident end, the circular flange surface at the S-polarized light exit end, and the square flange at the P-polarized light exit end.

[0055] Rotate the pitch adjustment group 1-9, the rotation adjustment group 1-10, and the yaw adjustment group 1-11 to make the incident end light pass through the intersection of the crosshairs on the circular flange surface of the incident end; due to the error caused by the splitter prism 1-1, the angle between the P polarized light and the S polarized light is not necessarily 90°. At this time, adjust the yaw adjustment group 1-11, and comprehensively observe the distance between the P polarized light output light and the intersection of the square flange surface and the distance between the S polarized light output light and the circular flange surface. When the two distances are equal, it means that the geometric center offset of the flange surface corresponding to the distance of the P polarized light and the S polarized light output light is basically the same, and the rough axis penetration is completed.

[0056] (2) Second set of prism adjustment and precision threading

[0057] Confirm the geometric direction of the second group of splitting prisms 11. The direction of the splitting prism 1-1 in the direction of P polarized light is consistent with the first splitting prism 1-1, but it should be noted that its adjustment structure needs to be installed in a staggered manner to avoid interference with the first prism and its structure. The inclined surface of the splitting prism 1-1 in the direction of S polarized light needs to face the first splitting prism and the bottom of the frame 3-1 at the same time. Install the second group of splitting prisms 11 and its adjustment structure in the frame 31 and fix and adjust the pitch adjustment group 1-9 and the rotation adjustment group 1-10 respectively, so that the P polarized light output light coincides with the intersection of the square flange surface, and the S polarized light output light coincides with the intersection of the circular flange surface, and the precision axis is completed.

[0058] (3) Inspection and installation of telescope re-inspection

[0059] Completing the precise axis penetration does not explain the linear polarization degree and extinction ratio of the emitted P-polarized light and S-polarized light. They are detected outside the P-polarized light output end and the S-polarized light output end of the frame 3-1 respectively. When the linear polarization degree and the extinction ratio are not ideal, the respective deflection adjustment groups 1-11 of the second group of light-dividing prisms are adjusted respectively to make the emitted P-polarized light and S-polarized light have similar extinction ratios and linear polarization degrees, and the polarization directions of the two groups of light are perpendicular, and the detection work is completed.

[0060] Set the spectroscopic system at the rear end of the telescope and cover it with visor 4-1, right visor 4-2, front visor 4-3, left visor 4-4, rear visor 4-5 and lower visor 4-6. Since the through-axis debugging in the laboratory is only for the spectroscopic system itself, the through-axis distance is short, so the long through-axis performance of the overall system at the rear end of the telescope is the basis for re-inspecting the actual situation of the spectroscopic system in the entire telescope rear end system. If the through-axis of each system has been completed well in the laboratory debugging, then even if there is a certain offset difference in the through-axis of the spectroscopic system, this value will be very small, and it only needs to be corrected by fine-tuning the pitch adjustment group 1-9 and rotation adjustment group 1-10 of the second group of light-dividing prisms, without removing it and returning it to the laboratory for re-debugging.

[0061] The device has three beam splitting prisms, which are used to split the incident light into two linear polarized lights with orthogonal polarization directions: P-polarized light and S-polarized light. The placement of the prisms has certain spacing requirements. Due to the uncertainty brought by prism production, the prisms need to present a certain angle correspondence with each other during the placement process. The device covers the optional adjustment of the three prisms in three dimensions: pitch, yaw, and rotation. Only by adjusting the precision screws, the angular correspondence of the three prisms in space can be found. Without the need for translation adjustment for compensation, the device can maintain a stable beam splitting effect in any observation posture of the telescope.

[0062] This embodiment is suitable for scientific research telescope equipment related to polarization research. It has the characteristics of light structure. In the working scene, it is installed at the rear end of the telescope, which can effectively reduce the unnecessary bending caused by the excessive weight of the telescope; during the debugging process, since the present invention moves the adjustment rotation center to the center of the prism, it has the characteristics of small structure volume and small space occupation; the present invention adopts a hollow frame design, which has good observability and ergonomic performance during debugging. When there is a problem in the debugging of the telescope and the spectroscopic system needs to be observed, it only needs to remove the baffle to make a quick and accurate judgment; during the observation process, the structure has good rigidity and can resist the bending deformation that meets the optical requirements.

[0063] The working principle of the present invention is:

[0064] By adjusting the pitch adjustment group, the beam splitter prism can be adjusted to nod and pitch rotation; by adjusting the rotation adjustment group, the beam splitter prism can be adjusted to shake and rotate; by adjusting the yaw adjustment group, the beam splitter prism can be adjusted to swing and yaw; for a single prism, the corresponding coordinates are X, Y, and Z, and the corresponding rotation dimensions are as follows: the pitch adjustment is a rotation around the Y axis, which rotates on the XZ plane;

[0065] Rotation: rotate around the Z axis and rotate on the XY plane; yaw: rotate around the X axis and rotate on the YZ plane; first adjust the three-dimensional rotation adjustment of the first group of light-dividing prisms to achieve the rough transmission axis of the incident light and the P-polarized light and S-polarized light, and then install the second group of light-dividing prisms and adjust their three-dimensional rotation to achieve the fine transmission axis of the P-polarized light and S-polarized light.

[0066] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0067] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A polarization measurement spectroscopic system adjustment device, characterized in that: The invention is composed of a beam splitter prism adjustment structure and a P polarized light reflector (2), a light shielding plate and an outer frame. The beam splitter prism adjustment structure comprises three beam splitter prisms (1-1), a rotation adjustment cantilever (1-2), a prism fixing frame (1-3), a prism fixing lower cover (1-4), a yaw adjustment plate (1-5), an adjustment base (1-6), a tightening screw group (1-7), a steel ball (1-8), a pitch adjustment group (1-9), a rotation adjustment group (1-10), a yaw adjustment group (1-11), a cantilever tightening spring (1-12) and a yaw adjustment plate tightening spring (1-13); and the outer frame comprises a frame (3-1) and a frame crossbeam (3-2). The three beam splitter prisms (1-1) are divided into two groups, one beam splitter prism is a first group, and the other two beam splitter prisms are arranged side by side as a second group. The incident light L is first split by the first beam splitter prism to form P polarized light and S polarized light respectively. The P polarized light and S polarized light are then emitted after passing through the second group beam splitter prisms on the left and rear sides of the first group beam splitter prism respectively to increase the polarization degree. Among them, the light P needs to pass through a reflector to change the emission direction. The emission direction of the S polarized light is set to the X direction, the incident light L is set to the Y direction, and the upward direction of the device is set to the Z direction, then the P polarized light is emitted from the opposite direction of the X direction.

2. The polarization measurement spectroscopic system adjustment device according to claim 1, characterized in that: The shading plate comprises an upper shading plate (4-1), a right shading plate (4-2), a front shading plate (4-3), a left shading plate (4-4), a rear shading plate (4-5) and a lower shading plate (4-6).

3. The polarization measurement spectroscopic system adjustment device according to claim 1, characterized in that: The three beam splitting prisms (1-1) are clamped together by a prism fixing frame (1-3) and a prism fixing lower cover (1-4), and fixed by a tightening screw group (1-7); the prism fixing frame (1-3) is adapted and fixed on the rotation adjustment cantilever (1-2) by a steel ball (1-8), a pitch adjustment group (1-9), a rotation adjustment group (1-10) and a cantilever tension spring (1-12); the rotation adjustment cantilever (1-2) is fixed on the yaw adjustment plate (1-5) by screws.

4. The polarization measurement spectroscopic system adjustment device according to claim 1, characterized in that: The two sides of the deflection adjustment plate (1-5) are provided with arc-shaped edges which cooperate with the arc-shaped protrusions of the adjustment base (1-6) to perform limited arc sliding motion on the deflection adjustment plate (1-5) and the adjustment base (1-6); the deflection adjustment group (1-11) and the deflection adjustment plate tension spring (1-13) are matched and fixed on the deflection adjustment plate (1-5) and the adjustment base (1-6) to achieve arc sliding adjustment.

5. The polarization measurement spectroscopic system adjustment device according to claim 1, characterized in that: The adjustment base (1-6), the P-polarized light reflector (2), the frame crossbeam (3-2), the upper light shielding plate (4-1), the right light shielding plate (4-2), the front light shielding plate (4-3), the left light shielding plate (4-4), the rear light shielding plate (4-5) and the lower light shielding plate (4-6) are fixed to the frame (3-1) by screws.

6. The polarization measurement spectroscopic system adjustment device according to claim 1, characterized in that: When the prism fixing frame (1-3) and the prism fixing lower cover (1-4) wrap the beam splitting prism (1-1), the incident surface, the reflection surface and the transmission surface are exposed.

7. The polarization measurement spectroscopic system adjustment device according to claim 1, characterized in that: The pitch adjustment group (1-9) and the rotation adjustment group (1-10) are located at positions where the rotation adjustment cantilever (1-2) contacts; the rotation adjustment cantilever (1-2) is engraved with a 1.5 mm deep equilateral right triangle limiting groove; the pitch adjustment group (1-9) corresponds to the limiting groove in the horizontal direction; and the rotation adjustment group (1-10) corresponds to the limiting groove in the vertical direction, so as to ensure that when the pitch adjustment group (1-9) and the rotation adjustment group (1-10) are rotated in and out, translational displacement of the rotation adjustment cantilever (1-2) and the prism fixing frame (1-3) is avoided.

8. The polarization measurement spectroscopic system adjustment device according to claim 6, characterized in that: The beam splitter prism (1-1) is provided with three adjustment modes: pitch, yaw and rotation; the pitch adjustment group (1-9), the rotation adjustment group (1-10) and the yaw adjustment group (1-11) cooperate with a cantilever tension spring (1-12) and a yaw adjustment plate tension spring (1-13) to achieve three-dimensional adjustment of the beam splitter prism; the rotation centers of the three dimensions are all located at the cube geometric center of the prism.

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