CN108332740B - Athermal high-precision optical turning prism system and design method - Google Patents
Athermal high-precision optical turning prism system and design method Download PDFInfo
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Abstract
The invention discloses a athermal high-precision optical turning prism system and a design method thereof, wherein the system comprises an optical conduction prism component, a non-fully-constrained supporting component and a composite outer frame component; wherein, the optical conduction prism component is connected with the composite material outer frame component through the non-fully-constrained supporting component; the optical conduction prism assembly comprises a plane mirror, an optical conduction prism and an adjustable plane mirror; one end of the optical conduction prism is a plane and is connected with the plane reflector; the other end of the optical conduction prism is a spherical surface and is connected with the adjustable plane reflector; the incident light beam passes through the hollow part of the optical transmission prism through the plane reflector, reaches the adjustable plane reflector and is emitted out, so that the high-precision deflection of the light beam is realized. The invention solves the problem that a high-precision measuring element is not influenced by an on-orbit thermal environment, and ensures the stability of optical level association between a camera and a star sensor.
Description
Technical Field
The invention belongs to the technical field of space optical remote sensors, and particularly relates to a athermal high-precision optical turning prism system and a design method.
Background
With the development of commercial remote sensing satellites, the requirement for improving the positioning precision of a non-control point is higher and higher, and the star sensor is used as equipment with the highest attitude measurement precision on a satellite, and generally required to be integrally installed with a camera and adopt precise temperature control so as to reduce the low-frequency error transmitted by the star sensor to the visual axis of the camera. Considering factors such as material degradation, the calibration of the included angle between the camera and the star sensor at regular intervals on the orbit is a necessary link. In order to improve the design flexibility and the on-track usability of the camera, an optical level association is necessary to be established between the camera and the star sensor, and the association of the camera and the star sensor by adopting an optical conduction prism is an important implementation approach. Considering the high precision characteristic of the measuring element, the on-orbit thermal environment influence must be avoided, and the existing temperature control precision cannot meet the requirement, so the design of the athermalized high-precision optical folding prism system is urgently needed.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the athermal high-precision optical turning prism system and the design method are provided, the problem that a high-precision measuring element is not influenced by an in-orbit thermal environment is solved, and the stability of optical level association between a camera and a star sensor is ensured.
The purpose of the invention is realized by the following technical scheme: according to an aspect of the present invention, there is provided an athermal high-precision optical folding prism system, comprising: the optical conduction prism assembly, the non-fully-constrained support assembly and the composite material outer frame assembly are arranged on the optical conduction prism assembly; wherein, the optical conduction prism component is connected with the composite material outer frame component through the non-fully-constrained supporting component; the optical conduction prism assembly comprises a plane mirror, an optical conduction prism and an adjustable plane mirror; one end of the optical conduction prism is a plane and is connected with the plane reflector; the other end of the optical conduction prism is a spherical surface and is connected with the adjustable plane reflector; the incident light beam passes through the hollow part of the optical transmission prism through the plane reflector, reaches the adjustable plane reflector and is emitted out, so that the high-precision deflection of the light beam is realized.
In the athermal high-precision optical folding prism system, the non-fully-constrained support assembly comprises a spring pressing block, a spring limiting column, a spring bushing adjusting gasket, a first prism outer frame, a second prism outer frame, a first prism inner frame, a second prism inner frame, a prism frame adjusting gasket, a limiting screw, a prism pressing frame, a first fastener and a second fastener; the first prism inner frame is fixed on the optical conduction prism through optical structure glue; the first prism outer frame is in compression joint with the prism inner frame, the spring insert sleeve is embedded in the first prism outer frame and the first prism inner frame through the spring insert sleeve adjusting gasket, the spring pressing block is arranged in the spring insert sleeve and is in compression joint with the optical conduction prism, the spring is arranged in the spring insert sleeve and is in compression joint with the spring pressing block, and the spring limiting column penetrates through the composite material outer frame component and is in compression joint with the spring; the second prism inner frame is fixed on the optical conduction prism through optical structure glue, and the second prism outer frame is connected with the second prism inner frame through a prism pressing frame, a prism frame adjusting gasket, a first fastener and a second fastener; and a plurality of limiting screws penetrate through the composite material outer frame assembly and are in compression joint with the second prism outer frame.
In the athermal high-precision optical turning prism system, the composite outer frame assembly comprises a composite outer frame, an embedding sleeve, a composite outer frame support, a composite outer frame gasket, a light-transmitting cylinder embedding sleeve, a light-transmitting cylinder, a structural adhesive, a third fastener and a fourth fastener; the embedded sleeve is arranged in a hole formed in the composite material outer frame, and the spring limiting column penetrates through the embedded sleeve to be in compression joint with the spring; a plurality of limiting screws penetrate through the composite material outer frame gasket and the composite material outer frame to be in compression joint with the second prism outer frame; the compound material outer frame gasket is stuck on the compound material outer frame, the light-through cylinder embedding sleeve is stuck on the compound material outer frame through structural adhesive, the light-through cylinder is connected with the light-through cylinder embedding sleeve through a fourth fastener, and the compound material outer frame support is connected with the compound material outer frame through a third fastener.
In the athermal high-precision optical turning prism system, the plane reflector, the optical conduction prism and the adjustable plane reflector are all made of zero-expansion glass ceramics.
In the athermal high-precision optical turning prism system, the incident angle of the incident light beam is 0 degree, and the emergent angle of the emergent light beam is 0 degree.
In the athermal high-precision optical turning prism system, the included angle between the plane reflector and the optical transmission prism is 45 degrees.
In the athermal high-precision optical turning prism system, the number of the limit screws is four.
According to another aspect of the present invention, there is also provided a method for designing an athermal high-precision optical folding prism system, the method comprising the steps of: connecting one end of the optical transmission prism, which is a plane, with the plane mirror, and connecting one end of the optical transmission prism, which is a spherical surface, with the adjustable plane mirror; and the optical conduction prism is connected with the composite outer frame component through the non-fully-constrained supporting component.
In the design method of the athermal high-precision optical turning prism system, the included angle between the plane reflecting mirror and the optical transmission prism is 45 degrees.
In the design method of the athermalization high-precision optical turning prism system, the non-fully-constrained support assembly comprises a spring pressing block, a spring limiting column, a spring bushing adjusting gasket, a first prism outer frame, a second prism outer frame, a first prism inner frame, a second prism inner frame, a prism frame adjusting gasket, a limiting screw, a prism pressing frame, a first fastener and a second fastener; the first prism inner frame is fixed on the optical conduction prism through optical structure glue; the first prism outer frame is in compression joint with the prism inner frame, the spring insert sleeve is embedded in the first prism outer frame and the first prism inner frame through the spring insert sleeve adjusting gasket, the spring pressing block is arranged in the spring insert sleeve and is in compression joint with the optical conduction prism, the spring is arranged in the spring insert sleeve and is in compression joint with the spring pressing block, and the spring limiting column penetrates through the composite material outer frame component and is in compression joint with the spring; the second prism inner frame is fixed on the optical conduction prism through optical structure glue, and the second prism outer frame is connected with the second prism inner frame through a prism pressing frame, a prism frame adjusting gasket, a first fastener and a second fastener; and a plurality of limiting screws penetrate through the composite material outer frame assembly and are in compression joint with the second prism outer frame.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method can be used for a system for monitoring the included angle between the high-precision surveying and mapping camera and the star sensor, so that the non-control point positioning precision of the remote sensing camera is improved.
(2) The invention utilizes the material characteristics of the microcrystalline glass and the outer frame of the cladding material to enlarge a force transmission path, can insulate heat by cladding multiple layers, and reduces the influence exerted on an optical piece by the external heat action of external force. The method reduces the requirement on thermal control while improving the precision, and optimizes the on-orbit satellite resource allocation.
(3) The invention can release the internal stress caused by vibration, weightlessness and temperature change through the non-fully-constrained support component, and reduce the deformation of the glass structural member connecting the two plane turning mirrors, thereby reducing the error generated during the optical path transmission.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of an athermal high-precision optical folding prism system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a transmission light path of a plane mirror and an optical transmission prism provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the calculation of beam pointing changes under temperature according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating changes in beam orientation as an optical element rotates according to embodiments of the present invention;
FIG. 5 is a schematic illustration of a support position for an optically conductive prism provided by an embodiment of the present invention;
FIG. 6 is a schematic structural view of a non-fully constrained support assembly provided by an embodiment of the present invention;
FIG. 7 is another schematic structural view of a non-fully constrained support assembly provided by an embodiment of the present invention;
fig. 8 is another schematic structural diagram of the composite frame assembly according to the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic structural diagram of an athermal high-precision optical folding prism system according to an embodiment of the present invention; fig. 2 is a schematic diagram of a transmission light path of a plane mirror and an optical transmission prism provided by an embodiment of the invention. As shown in fig. 1 and 2, the athermal high-precision optical folding prism system includes: the optical conduction prism assembly, the non-fully-constrained support assembly and the composite material outer frame assembly. Wherein the content of the first and second substances,
the optical conduction prism component is connected with the composite material outer frame component through the non-fully-constrained supporting component; the optical conduction prism assembly comprises a plane reflector 1, an optical conduction prism 2 and an adjustable plane reflector 21; wherein, one end of the optical conduction prism 2 is a plane and is connected with the plane reflector 1; the other end of the optical conduction prism 2 is a spherical surface and is connected with the adjustable plane reflector 21;
the incident light beam passes through the hollow part of the optical transmission prism 2 through the plane mirror 1, reaches the adjustable plane mirror 21 and is emitted out, so that the high-precision deflection of the light beam is realized.
As shown in fig. 1, 6 and 7, the non-fully-constrained support assembly includes a spring pressing block 4, a spring limiting column 6, a spring 8, a spring bushing 9, a spring bushing adjusting washer 10, a first prism outer frame 11, a second prism outer frame 112, a first prism inner frame 12, a second prism inner frame 121, a prism frame adjusting washer 15, a limiting screw 17, a prism pressing frame 18, a first fastener 14 and a second fastener 19. Wherein the content of the first and second substances,
the first prism inner frame 12 is fixed on the optical conduction prism 2 through optical structure glue 26; the first prism outer frame 11 is in compression joint with the prism inner frame 12, the spring insert sleeve 9 is embedded in the first prism outer frame 11 and the prism inner frame 12 through a spring insert sleeve adjusting gasket 10, the spring pressing block 4 is arranged in the spring insert sleeve 9 and is in compression joint with the optical conduction prism 2, the spring 8 is arranged in the spring insert sleeve 9 and is in compression joint with the spring pressing block 4, and the spring limiting column 6 penetrates through the composite material outer frame assembly and is in compression joint with the spring 8;
the second prism inner frame 121 is fixed on the optical conduction prism 2 through an optical structure adhesive 26, and the second prism outer frame 112 is connected with the second prism inner frame 121 through a prism press frame 18, a prism frame adjusting gasket 15, a first fastener 14 and a second fastener 19; a plurality of limit screws 17 penetrate through the composite material outer frame assembly to be in compression joint with the second prism outer frame 112.
As shown in fig. 1 and 8, the composite material outer frame assembly comprises a composite material outer frame 3, an insert sleeve 5, a composite material outer frame support 13, a composite material outer frame gasket 16, a light-transmitting cylinder insert sleeve 23, a light-transmitting cylinder 25, a structural adhesive 22, a third fastener 20 and a fourth fastener 24; wherein the content of the first and second substances,
the insert sleeve 5 is arranged in a hole formed in the composite material outer frame 3, and the spring limiting column 6 penetrates through the insert sleeve 5 and is in compression joint with the spring 8; a plurality of limit screws 17 penetrate through the composite outer frame gasket 16 and the composite outer frame 3 to be in compression joint with the second prism outer frame 112;
the composite material outer frame gasket 16 is adhered to the composite material outer frame 3 through the structural adhesive 22, the light-through cylinder embedding sleeve 23 is adhered to the composite material outer frame 3 through the structural adhesive, the light-through cylinder 25 is connected with the light-through cylinder embedding sleeve 23 through the fourth fastener 24, and the composite material outer frame support 13 is connected with the composite material outer frame 3 through the third fastener 20.
As shown in fig. 1, the optical conduction prism assembly and the non-fully-constrained support assembly are connected by an optical structure adhesive 26, and the non-fully-constrained support assembly and the composite outer frame assembly are connected by fasteners 7 (four groups are uniformly distributed in the circumferential direction). The external fastening points are arranged on the composite material outer frame bracket 13.
As shown in fig. 1 and 2, the optical conduction prism assembly is composed of a plane mirror 1, an optical conduction prism 2, and an adjustable plane mirror 21. One end of the optical conduction prism 2 is a plane and is fixed with the plane reflector 1 by using optical structure glue 26, and the other end is a spherical surface, and the adjustable plane reflector 21 is adjusted to a required deflection angle under the monitoring of the laser auto-collimation detection system and is fixed by using the optical structure glue 26.
As shown in fig. 1, the plane reflector 1, the optical transmission prism 2 and the adjustable plane reflector 21 are all made of zero-expansion glass ceramics, the non-fully-constrained supporting component and the composite material outer frame component can eliminate the influence of various factors such as temperature influence, assembly stress, processing error, vibration influence and the like, the change of the included angle of the reflecting edge is reduced to the minimum, and the system index requirement is met. The optical turning prism system designed by the invention has the characteristics of high precision, good thermal environment adaptability and the like.
The embodiment utilizes the zero expansion characteristic of microcrystalline glass as a stable optical conduction prism structure for connecting two plane reflectors, one end of the connection surface is designed to be a plane and is connected with the plane reflectors, and the other end of the connection surface is designed to be a spherical surface and is connected with an adjustable plane reflector. The plane reflector and the optical conduction prism are fixedly connected by glue, and then the plane reflector and the optical conduction prism are adjusted to the required turning angle by the spherical adjustable plane mirror under the monitoring of the laser auto-collimation detection system and are fixedly connected by the glue. At the same time. In order to eliminate the influence of multiple factors such as temperature influence, assembly stress, machining error, vibration influence and the like, the non-fully-constrained supporting assembly and the composite material outer frame assembly are designed, the machining error of the reflecting surface of the prism is controlled, the change of the included angle of the reflecting prism is reduced to the minimum, and the system index requirement is met.
The embodiment also provides a design method of an athermal high-precision optical folding prism system, which comprises the following steps:
connecting one end of the optical transmission prism 2, which is a plane, with the plane reflector 1, and connecting one end of the optical transmission prism 2, which is a spherical surface, with the adjustable plane reflector 21;
the optical conduction prism 2 is connected with the composite outer frame component through the non-fully-constrained supporting component.
Specifically, according to the requirement of designing an input optical conduction path, the length of the optical turning prism system is preliminarily designed to be 1200mm, and the incident and emergent angles are 0 degrees, that is, the emergent angle and the incident angle are the same. The included angle between the plane reflector and the optical transmission prism is 45 degrees.
The cross-sectional shape of the optical folding prism is determined to be a square of 30mm x 30mm according to the length of the optical conduction prism and the existing processing level.
Error assignment for optical folding prism system (3 σ)/":
| name (R) | Error (3 σ)/ |
| Error due to thermal deformation | 0.013 |
| Errors caused by rotation | 0.056 |
| Errors caused by gravity deformation bending | 0.200 |
As shown in fig. 4, the change in the pointing direction of the outgoing beam caused by the rotation of the optical folding prism system was calculated by the Monte-Carlo mathematical simulation method. The deviation of the incident beam of the prism is caused by the deformation of the prism surface and its rotation of the prism material due to the machining error. In modeling the prism system, assuming a reflection angle error caused by machining of 60 ", the prism rotation about axis X, Y, Z is 1'. Finally, the error caused by the rotation is found to be 0.05 ", which meets the requirements.
As shown in fig. 3, the optical folding prism system using zero-expansion glass ceramics as a material was subjected to thermal deformation error analysis, and the change in the direction of the outgoing beam was consistent with the temperature difference between the prisms of different thicknesses. This is related to the change in the working angle of the prism caused by the coefficient of linear expansion and also to the change in the optical path length of the prism at different thicknesses caused by the temperature coefficient of refractive index change. The beam is thus deviated at an angle Δ Ψ t during its passage through the prism. The longitudinal temperature difference on the prism does not cause the pointing direction of the emergent beam to change.
For an optically conducting prism, the change in the pointing direction of the outgoing beam caused by the effect of temperature (only reflection occurs in this folding prism system) is calculated using the following formula:
in the formula:
Δ Ψ t — the divergence angle of the beam due to thermal deformation (taken here to be 0.013 ");
h-prism thickness (here 30 mm);
LПprism length (here taken to be 1200 mm);
α T-prism linear expansion coefficient (here, 2 × 10-8/K)；
Delta T-temperature difference;
the temperature variation range meeting the use requirement is obtained.
The mathematical simulation of the optical folding prism system in the Ansys program calculates the position of the support point when the error caused by bending under gravity to the folding angle satisfies the error distribution as shown in fig. 5. The distance in fig. 5 is in mm.
The design result of the non-fully-constrained structure at the prism supporting position is shown in fig. 1, a spring is selected according to the simulation calculation result, and the spring parameters are as follows: the material is alloy spring steel, the diameter of a steel wire is 1.2mm, the middle diameter of the spring is 26mm, the effective number of turns is 6, the compression length is 15mm, and the free length is 20 mm.
The structure of the composite material outer frame and the supporting position of the composite material outer frame are designed according to the supporting position of the prism and are brought into a model for simulation calculation, and the temperature variation of the prism under the working conditions of high temperature and low temperature does not exceed 0.04 ℃ through the thermal design simulation calculation, so that the error requirement of 0.09 ℃ is met. Through resistance chemical design simulation calculation, the strength of each part of the structure meets the use requirement.
The method can be used for a system for monitoring the included angle between the high-precision surveying and mapping camera and the star sensor, so that the non-control point positioning precision of the remote sensing camera is improved; in addition, the force transmission path is enlarged by utilizing the material characteristics of the microcrystalline glass and the outer frame of the outer covering material, heat can be insulated by covering multiple layers, and the influence exerted on the optical piece by the external heat action of external force is reduced. The requirement on thermal control is reduced while the precision is improved, and the on-orbit satellite resource allocation is optimized; in addition, the embodiment can release internal stress caused by vibration, weightlessness and temperature change through the non-fully-constrained supporting component, and reduce the deformation of a glass structural member for connecting the two plane turning mirrors, thereby reducing errors generated during optical path transmission.
The above-described embodiments are merely preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (8)
1. An athermal, high-precision optical folding prism system, comprising: the optical conduction prism assembly, the non-fully-constrained support assembly and the composite material outer frame assembly are arranged on the optical conduction prism assembly; wherein the content of the first and second substances,
the optical conduction prism assembly is connected with the composite outer frame assembly through the non-fully-constrained supporting assembly;
the optical transmission prism assembly comprises a plane reflector (1), an optical transmission prism (2) and an adjustable plane reflector (21); wherein, one end of the optical conduction prism (2) is a plane and is connected with the plane reflector (1); the other end of the optical conduction prism (2) is a spherical surface and is connected with the adjustable plane reflector (21);
an incident beam passes through the hollow part of the optical transmission prism (2) through the plane reflector (1), reaches the adjustable plane reflector (21) and is emitted out, so that the high-precision deflection of the beam is realized; wherein the content of the first and second substances,
the non-fully-constrained supporting assembly comprises a spring pressing block (4), a spring limiting column (6), a spring (8), a spring bushing (9), a spring bushing adjusting gasket (10), a first prism outer frame (11), a second prism outer frame (112), a first prism inner frame (12), a second prism inner frame (121), a prism frame adjusting gasket (15), a limiting screw (17), a prism pressing frame (18), a first fastener (14) and a second fastener (19); wherein the content of the first and second substances,
the first prism inner frame (12) is fixed on the optical conduction prism (2) through optical structure glue;
the first prism outer frame (11) is in compression joint with the first prism inner frame (12), the spring insert sleeve (9) is embedded in the first prism outer frame (11) and the first prism inner frame (12) through a spring insert sleeve adjusting gasket (10), the spring pressing block (4) is arranged in the spring insert sleeve (9) and is in compression joint with the optical conduction prism (2), the spring (8) is arranged in the spring insert sleeve (9) and is in compression joint with the spring pressing block (4), and the spring limiting column (6) penetrates through the composite material outer frame component and is in compression joint with the spring (8);
the second prism inner frame (121) is fixed on the optical conduction prism (2) through optical structure glue, and the second prism outer frame (112) is connected with the second prism inner frame (121) through a prism pressing frame (18), a prism frame adjusting gasket (15), a first fastener (14) and a second fastener (19); and a plurality of limiting screws (17) penetrate through the composite material outer frame assembly to be in compression joint with the second prism outer frame (112).
2. The athermal, high-precision optical folding prism system of claim 1, wherein: the composite outer frame assembly comprises a composite outer frame (3), an embedding sleeve (5), a composite outer frame support (13), a composite outer frame gasket (16), a light-transmitting cylinder embedding sleeve (23), a light-transmitting cylinder (25), a structural adhesive (22), a third fastener (20) and a fourth fastener (24); wherein the content of the first and second substances,
the insert sleeve (5) is arranged in a hole formed in the composite material outer frame (3), and the spring limiting column (6) penetrates through the insert sleeve (5) to be in compression joint with the spring (8);
a plurality of limiting screws (17) penetrate through the composite material outer frame gasket (16) and the composite material outer frame (3) to be in compression joint with the second prism outer frame (112);
the composite material outer frame gasket (16) is adhered to the composite material outer frame (3), the smooth tube embedding sleeve (23) is adhered to the composite material outer frame (3) through the structural adhesive, the smooth tube (25) is connected with the smooth tube embedding sleeve (23) through a fourth fastener (24), and the composite material outer frame support (13) is connected with the composite material outer frame (3) through a third fastener (20).
3. The athermal, high-precision optical folding prism system of claim 1, wherein: the plane reflector (1), the optical conduction prism (2) and the adjustable plane reflector (21) are all made of zero-expansion glass ceramics.
4. The athermal, high-precision optical folding prism system of claim 1, wherein: the incident angle of the incident beam is 0 °, and the exit angle of the emitted beam is 0 °.
5. The athermal, high-precision optical folding prism system of claim 1, wherein: the included angle between the plane reflector (1) and the optical conduction prism (2) is 45 degrees.
6. The athermal, high-precision optical folding prism system of claim 1, wherein: the number of the limiting screws (17) is four.
7. A method for designing an athermal high-precision optical turning prism system, comprising the steps of:
one end of the optical conduction prism (2) which is a plane is connected with the plane reflector (1), and one end of the optical conduction prism (2) which is a spherical surface is connected with the adjustable plane reflector (21);
the optical conduction prism (2) is connected with the composite outer frame component through the non-fully-constrained supporting component; wherein the content of the first and second substances,
the non-fully-constrained supporting assembly comprises a spring pressing block (4), a spring limiting column (6), a spring (8), a spring bushing (9), a spring bushing adjusting gasket (10), a first prism outer frame (11), a second prism outer frame (112), a first prism inner frame (12), a second prism inner frame (121), a prism frame adjusting gasket (15), a limiting screw (17), a prism pressing frame (18), a first fastener (14) and a second fastener (19); wherein the content of the first and second substances,
the first prism inner frame (12) is fixed on the optical conduction prism (2) through optical structure glue;
the first prism outer frame (11) is in compression joint with the first prism inner frame (12), the spring insert sleeve (9) is embedded in the first prism outer frame (11) and the first prism inner frame (12) through a spring insert sleeve adjusting gasket (10), the spring pressing block (4) is arranged in the spring insert sleeve (9) and is in compression joint with the optical conduction prism (2), the spring (8) is arranged in the spring insert sleeve (9) and is in compression joint with the spring pressing block (4), and the spring limiting column (6) penetrates through the composite material outer frame component and is in compression joint with the spring (8);
the second prism inner frame (121) is fixed on the optical conduction prism (2) through optical structure glue, and the second prism outer frame (112) is connected with the second prism inner frame (121) through a prism pressing frame (18), a prism frame adjusting gasket (15), a first fastener (14) and a second fastener (19); and a plurality of limiting screws (17) penetrate through the composite material outer frame assembly to be in compression joint with the second prism outer frame (112).
8. The method for designing athermal high-precision optical turning prism system according to claim 7, wherein the angle between the plane mirror (1) and the optical transmission prism (2) is 45 °.
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