High-precision infrared eyepiece group and primary / secondary mirror butt joint adjusting method

Abstract

The application provides a high-precision infrared eyepiece group and main-secondary lens butt joint adjustment method, and belongs to the technical field of optical imaging adjustment, and specifically comprises the following steps: 1, removing the infrared lens group of the eyepiece group, placing a spherical mirror in the eyepiece barrel, the curvature radius of the spherical mirror is consistent with the distance from the spherical mirror to the primary-secondary lens primary image point; 2, self-calibrating the primary-secondary lens and the plane laser interferometer; 3, butting the eyepiece barrel provided with the spherical mirror with the primary-secondary lens, adjusting the position of the eyepiece barrel according to the parameters displayed by the plane laser interferometer, and stopping until the parameters displayed by the plane laser interferometer meet the design requirements; 4, fixing the eyepiece barrel, taking out the spherical mirror in the eyepiece barrel, and mounting the original infrared lens group of the system, and completing the adjustment of the infrared cassette system. Through the processing scheme, the problem that the infrared telescope eyepiece cannot realize high-precision adjustment because it is not transparent to the working waveband of the interferometer is solved.

Description

Technical Field

[0001] This application relates to the field of optical imaging assembly and adjustment, and in particular to a high-precision method for assembling and adjusting a high-precision infrared eyepiece assembly with a primary and secondary mirror. Background Technology

[0002] To meet the requirements for detecting distant targets, optical systems need to be designed with long focal lengths and large apertures. Cassette-type catadioptric systems are widely used due to their compact structure and strong aberration correction capabilities.

[0003] To achieve high-quality imaging, the precision requirements for the assembly and adjustment of Cassette catadioptric systems are becoming increasingly stringent. Currently, high-precision assembly and adjustment generally utilizes laser interferometers. This places two demands on Cassette catadioptric systems: first, perfect imaging must be achieved on the axes of the primary and secondary mirrors, which must be ensured during optical design; second, the Cassette lenses must be transparent to the interferometer's operating wavelength. Since laser interferometers typically operate in the 632.8nm band, which infrared lenses do not transmit, high-precision assembly and adjustment of infrared Cassette catadioptric systems cannot be achieved using interferometers when aligning the eyepiece assembly with the primary and secondary mirrors. The traditional method involves inserting a dividing plate into the eyepiece tube to align the primary and secondary mirrors with the eyepiece tube. However, this method uses a tooling mirror to replace the optical axes of the primary and secondary mirrors, resulting in significant errors and limited precision. Summary of the Invention

[0004] In view of this, this application provides a high-precision method for docking and adjusting the infrared eyepiece assembly with the primary and secondary mirrors, which solves the problem that the infrared telescope eyepiece cannot achieve high-precision docking because it does not penetrate the working band of the interferometer.

[0005] This application provides a high-precision method for docking and adjusting the primary and secondary infrared eyepiece assembly with the main and secondary mirrors, which adopts the following technical solution:

[0006] A method for assembling and adjusting a high-precision infrared eyepiece assembly with primary and secondary mirrors includes the following steps:

[0007] Step 1: Remove the infrared lens group of the eyepiece group and place a spherical mirror in the eyepiece tube. The radius of curvature of the spherical mirror is the same as the distance from the spherical mirror to the primary and secondary image points.

[0008] Step 2: Auto-align the primary and secondary mirrors with the planar laser interferometer;

[0009] Step 3: Align the eyepiece tube equipped with the spherical mirror with the primary and secondary mirrors, and adjust the position of the eyepiece tube according to the parameters displayed by the planar laser interferometer until the parameters displayed by the planar laser interferometer meet the design requirements.

[0010] Step 4: Fix the eyepiece tube, remove the spherical mirror from the eyepiece tube, install the infrared lens group described in the system, and complete the installation and adjustment of the infrared cassette system.

[0011] Optionally, the spherical reflector is a concave mirror, with the concave surface of the concave mirror facing the secondary mirror.

[0012] Optionally, the radius of curvature R of the spherical mirror is 10-80 mm.

[0013] Optionally, the position of the spherical mirror in the eyepiece tube requires that the aperture of the spherical mirror can completely cover the light rays that reach the spherical mirror through the primary and secondary mirrors.

[0014] Optionally, the position of the spherical mirror in the eyepiece tube requires that the aperture of the spherical mirror can completely cover the light rays that reach the spherical mirror through the primary and secondary mirrors.

[0015] Optionally, the film layer is silver or aluminum.

[0016] Optionally, the specific steps in step 3 of adjusting the position of the eyepiece tube according to the parameters displayed by the planar laser interferometer until the parameters displayed by the planar laser interferometer meet the design requirements include:

[0017] By observing the Zernike power value and coma value displayed on the planar laser interferometer, the eyepiece tube is moved along the mounting surface of the structure in the x, y, and z directions, where the z direction is the optical axis direction;

[0018] If there is a power value, move the eyepiece tube in the z direction; if there is a coma value in the x direction, move the eyepiece tube in the x direction; if there is a coma value in the y direction, move the eyepiece tube in the y direction, until both the power value and the coma value reach their minimum.

[0019] In summary, this application includes the following beneficial technical effects:

[0020] This application designs an assembly method that places a spherical reflector inside the infrared eyepiece tube to replace the original infrared telescope eyepiece assembly during assembly. The design ensures that the center of the spherical reflector coincides with the primary and secondary mirror image points. A planar laser interferometer is then used to align and align the primary and secondary mirrors with the spherical reflector. After assembly, the infrared eyepiece tube is fixed, the assembly method spherical reflector is removed, and the original infrared eyepiece assembly is placed back into the eyepiece tube. This method significantly improves the assembly accuracy of the infrared cassette-reflector system. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1This is a schematic diagram illustrating the principle of the high-precision infrared eyepiece assembly and primary / secondary mirror docking and adjustment method of this application.

[0023] Explanation of reference numerals in the attached diagram: 1. Planar laser interferometer; 2. Primary mirror; 3. Secondary mirror; 4. Primary and secondary mirror image point; 5. Spherical mirror; 6. Eyepiece tube. Detailed Implementation

[0024] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0025] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0027] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0028] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0029] This application provides a method for assembling and adjusting a high-precision infrared eyepiece assembly with primary and secondary lenses. This method is applied to the assembly and adjustment of a high-precision infrared eyepiece assembly with primary and secondary lenses in an infrared cassette system.

[0030] like Figure 1 As shown, a method for assembling and adjusting a high-precision infrared eyepiece assembly with primary and secondary mirrors includes the following steps:

[0031] Step 1: Remove the infrared lens group of the eyepiece assembly and place the spherical mirror 5 in the eyepiece tube 6. The radius of curvature of the spherical mirror 5 is consistent with the distance L from the spherical mirror 5 to the primary image point 4 of the primary and secondary mirrors, that is, the center of the spherical mirror 5 coincides with the primary image point 4 of the primary and secondary mirrors.

[0032] Step 2: Align the primary mirror 2 and secondary mirror 3 with the planar laser interferometer 1.

[0033] Step 3: Align the eyepiece tube 6, which is equipped with the spherical mirror 5, with the primary mirror 2 and the secondary mirror 3. Adjust the position of the eyepiece tube 6 according to the parameters displayed by the planar laser interferometer 1 until the parameters displayed by the planar laser interferometer 1 meet the design requirements.

[0034] Step 4: Fix the eyepiece tube 6, remove the spherical mirror 5 from the eyepiece tube 6, install the infrared lens group described in the system, and complete the installation and adjustment of the infrared cassette system.

[0035] This application designs an assembly method to place a spherical reflector 5 inside the infrared eyepiece tube 6, replacing the original infrared telescope eyepiece assembly during assembly. The design ensures that the center of the spherical reflector 5 coincides with the primary image point 4 of the primary and secondary mirrors. A planar laser interferometer 1 is then used to align and assemble the primary mirror 2 and secondary mirror 3 with the spherical reflector 5. After assembly, the infrared eyepiece tube 6 is fixed, the assembly method spherical reflector 5 is removed, and the original infrared eyepiece assembly is placed back into the eyepiece tube 6. This method significantly improves the assembly accuracy of the infrared cassette-type catadioptric system.

[0036] The specific steps for aligning and adjusting the primary mirror 2 and secondary mirror 3 with the spherical mirror 5 using a planar laser interferometer 1 include: by checking the Zernike coefficient power value and coma value displayed on the planar laser interferometer 1, moving the eyepiece tube 6 along the mounting surface of the structure in the x, y, and z directions, where the z direction is the optical axis direction; if there is a power value, move the eyepiece tube 6 in the z direction; if there is a coma value in the x direction, move the eyepiece tube 6 in the x direction; if there is a coma value in the y direction, move the eyepiece tube 6 in the y direction, until both the power value and the coma value reach their minimum.

[0037] Regarding the spherical mirror 5: The spherical mirror 5 is a concave mirror, with its concave surface facing the secondary mirror 3. The radius of curvature R of the spherical mirror 5 is 10-80mm. The position of the spherical mirror 5 within the eyepiece tube 6 requires that the aperture of the spherical mirror 5 completely cover the light rays reaching the spherical mirror 5 after passing through the primary mirror 2 and the secondary mirror 3.

[0038] The surface of the spherical reflector 5 is coated with a film layer corresponding to the working wavelength of the reflective plane laser interferometer 1. The film layer is silver or aluminum; that is, it is coated or aluminum is deposited on the concave surface of the spherical reflector 5.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for assembling and adjusting a high-precision infrared eyepiece assembly with primary and secondary mirrors, characterized in that, Includes the following steps: Step 1: Remove the infrared lens group of the eyepiece group and place a spherical mirror (5) in the eyepiece tube (6). The radius of curvature of the spherical mirror (5) is consistent with the distance from the spherical mirror (5) to the primary image point (4) of the primary and secondary mirrors. Step 2: Align the primary mirror (2) and secondary mirror (3) with the planar laser interferometer (1); Step 3: Align the eyepiece tube (6) with the spherical mirror (5) with the primary mirror (2) and the secondary mirror (3), and adjust the position of the eyepiece tube (6) according to the parameters displayed by the planar laser interferometer (1) until the parameters displayed by the planar laser interferometer (1) meet the design requirements. Step 4: Fix the eyepiece tube (6), take out the spherical mirror (5) from the eyepiece tube (6), install the infrared lens group described in the system, and complete the installation and adjustment of the infrared cassette system.

2. The high-precision infrared eyepiece assembly and primary / secondary mirror docking and adjustment method according to claim 1, characterized in that, The spherical mirror (5) is a concave mirror, and the concave surface of the concave mirror faces the secondary mirror (3).

3. The high-precision infrared eyepiece assembly and primary / secondary mirror docking and adjustment method according to claim 2, characterized in that, The radius of curvature R of the spherical mirror (5) is 10-80 mm.

4. The high-precision infrared eyepiece assembly and primary / secondary mirror docking and adjustment method according to claim 1, characterized in that, The position of the spherical mirror (5) in the eyepiece tube (6) requires that the aperture of the spherical mirror (5) can completely cover the light rays that reach the spherical mirror (5) through the primary mirror (2) and the secondary mirror (3).

5. The high-precision infrared eyepiece assembly and primary / secondary mirror docking and adjustment method according to claim 1, characterized in that, The surface of the spherical mirror (5) is coated with a film layer of the working band of the reflective plane laser interferometer (1).

6. The high-precision infrared eyepiece assembly and primary / secondary mirror docking and adjustment method according to claim 5, characterized in that, The film layer is made of silver or aluminum.

7. The high-precision infrared eyepiece assembly and primary / secondary mirror docking and adjustment method according to claim 1, characterized in that, The specific steps in step 3 of adjusting the position of the eyepiece tube (6) according to the parameters displayed by the planar laser interferometer (1) until the parameters displayed by the planar laser interferometer (1) meet the design requirements include: By viewing the Zernike power value and coma value displayed by the planar laser interferometer (1), the eyepiece tube (6) is moved along the mounting surface of the structure in the x, y, and z directions, where the z direction is the optical axis direction; If there is a power value, move the eyepiece tube (6) in the z direction; if there is a coma value in the x direction, move the eyepiece tube (6) in the x direction; if there is a coma value in the y direction, move the eyepiece tube (6) in the y direction until both the power value and the coma value reach their minimum.

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