A full field of view adjustment method and tool for a cassette telescope system

Abstract

The present application is a kind of full field adjustment method and tooling of Cassegrain telescope system, belonging to the field of precision optical machine adjustment; the adjustment method requires first measuring the main mirror surface type with an interferometer, and aligning the main mirror optical axis with the interferometer; then installing the special tooling on the secondary mirror support, adjusting the secondary mirror back reference to align with the interferometer, ensuring that the main and secondary mirror optical axes are pointing in the same direction; finally adjusting the X / Y / Z three degrees of freedom translation of the secondary mirror relative to the main mirror, ensuring that the main and secondary mirror system wavefront meets the design requirements, completing the adjustment of Cassegrain telescope system. Including secondary mirror adjustment tooling adapter, secondary mirror adhesive threaded head, spring shaft, adjustment tooling base, adjustment tooling sliding seat, axial adjustment knob, adjustment tooling gland, spring, jackscrew. The present application provides a kind of full field adjustment method and tooling of Cassegrain telescope system, solves the problem of asymmetric edge field wavefront of Cassegrain telescope system, and the full field wavefront index is difficult to achieve, while improving the adjustment efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of precise optical machine adjustment, and particularly relates to a full field of view adjustment method and tool for a Cassegrain system. BACKGROUND

[0002] The Cassegrain system is a coaxial reflective system composed of a primary mirror and a secondary mirror, and is generally adjusted by measuring system wavefront aberration with an interferometer. During adjustment of the position of the secondary mirror relative to the primary mirror, if the secondary mirror simultaneously changes in angle and translation relative to the primary mirror and compensates for each other, the design requirements can still be met in the central field of view. However, since the optical axes of the primary mirror and the secondary mirror are not collinear, the coma and first-order astigmatism in the wavefront aberration of the Cassegrain system rapidly increases with the increase of the field angle, resulting in the asymmetry of the wavefront in the full field of view.

[0003] In order to ensure the symmetry of the wavefront aberration of the Cassegrain system in each edge field of view, it is necessary to strictly control the pointing consistency of the optical axes of the primary mirror and the secondary mirror during adjustment, and only adjust the translation of the secondary mirror to ensure that the wavefront in the central field of view meets the design index. At this time, the full field of view wavefront of the system can be basically symmetrical. SUMMARY

[0004] Technical problems to be solved:

[0005] In order to avoid the shortcomings of the prior art, the present application provides a full field of view adjustment method and tool for a Cassegrain system, which solves the problem of asymmetry of the wavefront in the edge field of view of the Cassegrain system and the difficulty in achieving the full field of view index, and improves the adjustment efficiency.

[0006] The technical scheme of the present application is as follows:

[0007] Step 1: measuring the surface shape of the primary mirror with a laser interferometer and a standard sphere;

[0008] Step 2: establishing an adjustment reference;

[0009] Step 3: installing the secondary mirror on the secondary mirror support of the Cassegrain system through a special tool to ensure that the back reference reflecting surface of the secondary mirror is exposed;

[0010] Step 4: adjusting the central field of view wavefront RMS value of the primary and secondary mirror system to meet the standard;

[0011] Step 5: installing an ocular group;

[0012] Step 6: adjusting to make the central field of view wavefront of the telescope system minimum;

[0013] Step 7: adjusting the elevation and azimuth field of view of the Cassegrain system to make the measurement results of the four edge field of view wavefront meet the design requirements, i.e., the adjustment is completed.

[0014] The further technical scheme of the present application is that in the step 1, the primary mirror frame is arranged in front of the laser interferometer, and a standard ball is arranged between the primary mirror frame and the laser interferometer, so that the parallel light emitted by the laser interferometer is reflected by the parabolic primary mirror and converges at a point, and the standard ball is substantially coincident with the converging point of the measuring light.

[0015] The further technical scheme of the present application is that in the step 2, the primary mirror angle and the standard ball position are iteratively adjusted in the measurement of the step 1 until the RMS value of the primary mirror surface is minimum, at this time, the optical axis of the primary mirror is aligned with the laser interferometer, and the current primary mirror position is taken as the subsequent adjustment reference.

[0016] The further technical scheme of the present application is that in the step 3, a gasket is arranged between the special tooling and the secondary mirror support, and the back reference of the secondary mirror is adjusted to be perpendicular to the measuring light of the laser interferometer, so that the optical axes of the primary mirror and the secondary mirror are consistent.

[0017] The further technical scheme of the present application is that in the step 4, the adjustment method is that the standard ball is moved to the converging point of the primary mirror and the secondary mirror, the wavefront in the central field of view of the primary mirror and the secondary mirror system is measured, the two out-of-axis aberration values of the coma and the first-order astigmatism based on the measurement result are used to adjust the X / Y two-degree-of-freedom translation of the secondary mirror relative to the primary mirror, the Z-direction translation of the secondary mirror relative to the primary mirror is adjusted based on the spherical aberration value of the measurement result, and the wavefront RMS value of the central field of view of the primary mirror and the secondary mirror system is reduced to minimum and meets the design requirement.

[0018] The further technical scheme of the present application is that in the step 5, the installation method is that the standard ball is removed, the eyepiece group of the telescope system is installed, a plane mirror is arranged behind the eyepiece group, the thickness of the gasket below the eyepiece group is adjusted based on the spherical aberration of the wavefront measurement result, and the Z-direction spacing of the eyepiece group relative to the primary mirror and the secondary mirror is ensured.

[0019] The further technical scheme of the present application is that in the step 6, the adjustment method is that the two out-of-axis aberration values of the coma and the first-order astigmatism based on the wavefront measurement result are used to iteratively adjust the angle of the plane mirror and the X / Y two-degree-of-freedom translation of the eyepiece group, so that the wavefront of the central field of view of the telescope system is minimum and meets the design requirement.

[0020] The further technical scheme of the present application is that in the step 7, the adjustment method is that the theodolite is arranged to monitor and record the current posture of the spotting scope, the spotting scope is adjusted to four positions of the pitch ±1° field of view and the azimuth ±1° field of view, the plane mirror is adjusted to compensate the return image position, and the wavefront of the edge field of view of the spotting scope is measured; if the measurement results of the four edge field of views meet the design requirement, the adjustment is ended;

[0021] If the measurement results of the edge field of view do not all meet the design requirement, the spotting scope is adjusted to return to the central field of view, the two out-of-axis aberration values of the coma and the first-order astigmatism based on the four edge field of views are used to finely adjust the X / Y two-degree-of-freedom of the eyepiece group, and then the edge field of view is measured again, that is, the design requirement is met, and the adjustment is completed.

[0022] A secondary mirror special tool, comprising a secondary mirror adjustment tool adapter, a secondary mirror bonding threaded head, a spring shaft, an adjustment tool base, an adjustment tool sliding seat, an axial adjustment knob, an adjustment tool gland, a spring, and a jackscrew, the secondary mirror adjustment tool adapter, the adjustment tool base, and the adjustment tool gland are coaxially fixed and connected in sequence along the axial direction; the through hole of the adjustment tool base is a stepped hole, the small-diameter end faces the secondary mirror adjustment tool adapter, and the large-diameter end faces the adjustment tool gland;

[0023] The adjustment tool sliding seat is of an annular structure, the outer and inner circumferential surfaces of one end thereof are both provided with annular protrusions in the circumferential direction, the annular protrusion of the outer circumferential surface is mounted in the large-diameter end of the adjustment tool base and is limited in axial displacement by the adjustment tool gland, and a moving space is left in the radial direction; the other end of the adjustment tool sliding seat is provided with external threads;

[0024] One end of the secondary mirror bonding threaded head is provided with a shaft shoulder, and the other end is provided with internal threads, which extend into the through hole of the secondary mirror adjustment tool adapter; the outer end surface of the shaft shoulder of the secondary mirror bonding threaded head is used for mounting the secondary mirror;

[0025] The spring shaft is of a sleeve structure provided with a shaft shoulder at one end and external threads at the other end, extends into the through hole of the adjustment tool gland, and is coaxially and fittingly mounted with the internal threads of the secondary mirror bonding threaded head through the external threads;

[0026] The spring is sleeved on the spring shaft and located between the inner circumferential surface annular protrusion of the adjustment tool sliding seat and the shaft shoulder of the spring shaft;

[0027] The axial adjustment knob is of an annular structure, one end thereof is provided with internal threads, and the other end is provided with a coaxial annular limiting surface, which is in contact with the outer end surface of the shaft shoulder of the spring shaft and limits the axial displacement thereof; the internal threads of the axial adjustment knob are fittingly mounted with the external threads of the adjustment tool sliding seat, the axial pressure of the spring shaft is applied by screwing, and then the axial position, i.e., the Z-direction position, of the outer end surface of the secondary mirror bonding threaded head is adjusted;

[0028] The outer circumferential surface of the adjustment tool base is uniformly provided with four radial holes in the circumferential direction, which are used for mounting the jackscrew; the bottom end of the jackscrew is in contact with the circumferential surface of the outer circumferential surface annular protrusion of the adjustment tool sliding seat, and the X / Y direction position of the adjustment tool sliding seat is adjusted by adjusting the screwing depth.

[0029] A method for assembling and adjusting a secondary mirror special tool, the specific steps of which are as follows:

[0030] Step 1: Before the tool is used, the secondary mirror adjusting tool adapter is installed on the secondary mirror support of the cassette telescope system by screws, and then the rest of the tool is installed on the secondary mirror adjusting tool adapter by screws; so that the secondary mirror adjusting tool adapter, the adjusting tool base, the adjusting tool gland and the secondary mirror support of the cassette telescope system are fixed as a whole by screws; the spring shaft and the secondary mirror adhesive threaded head are fixed as a whole by thread cooperation;

[0031] Step 2: The secondary mirror is fixed on the secondary mirror adhesive threaded head by using ultraviolet curing glue; when the tool is disassembled, the glue layer is dissolved by using acetone solution;

[0032] Step 3: The adjusting tool sliding seat is two-dimensionally translated in the adjusting tool base through the action of the four jacks, so as to adjust the X / Y direction position of the secondary mirror relative to the primary mirror;

[0033] Step 4: Due to the geometric limit between the spring shaft and the adjusting tool sliding seat, clockwise rotation of the axial adjusting knob will compress the spring, and counterclockwise rotation of the spring will loosen the spring, so as to adjust the Z direction position of the spring shaft and the secondary mirror relative to the primary mirror.

[0034] Beneficial effects

[0035] The beneficial effects of the present application are that: if the optical axis cannot be accurately controlled to be collinear with the primary mirror during the secondary mirror assembly and adjustment of the cassette telescope system, the wavefront in the central field of view can still meet the design requirements, but the wavefront in each edge field of view will be asymmetric, and one side edge wavefront may be out of tolerance. The present application provides a cassette telescope system assembly and adjustment method which can guarantee the wavefront in the full field of view, and designs a special tool for secondary mirror assembly and adjustment, solves the above technical problems and improves the assembly and adjustment efficiency.

[0036] The assembly and adjustment method requires that the primary mirror surface is measured by an interferometer first, and the primary mirror optical axis is aligned with the interferometer; then the special tool is installed on the secondary mirror support, the secondary mirror back reference is adjusted to be aligned with the interferometer, and the pointing directions of the primary mirror and the secondary mirror optical axes are ensured to be consistent; finally, the X / Y / Z three-degree-of-freedom translation of the secondary mirror relative to the primary mirror is adjusted, the wavefront of the primary mirror and the secondary mirror system is ensured to meet the design requirements, and the cassette telescope system assembly and adjustment are completed. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a schematic diagram of the primary mirror assembly and adjustment optical path of the cassette telescope system of Example 1;

[0038] Figure 2 It is a schematic diagram of the special tool for the cassette telescope system assembly and adjustment of Example 1;

[0039] Figure 3 It is a schematic diagram of the secondary mirror assembly and adjustment optical path of the cassette telescope system of Example 1;

[0040] Figure 4 It is a schematic diagram of the full field of view measurement optical path of the cassette telescope system of Example 1.

[0041] Reference signs: 1. secondary mirror adjustment tool adapter, 2. secondary mirror bonding threaded head, 3. spring shaft, 4. adjustment tool base, 5. adjustment tool sliding seat, 6. axial adjustment knob, 7. adjustment tool gland, 8. spring mounting position, 9. jackscrew, 10. primary mirror, 11. standard spherical mirror, 12. secondary mirror, 13. secondary mirror adjustment special tool, 14. secondary mirror support, 15. plane mirror, 16. theodolite, 17. eyepiece group. DETAILED DESCRIPTION

[0042] The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0044] Example 1

[0045] The present embodiment is a full field of view adjustment method and special adjustment tool for a cassette telescope system, wherein the primary mirror 10 in the cassette telescope system is a parabolic mirror, the secondary mirror 12 is a high-order aspheric surface, and the eyepiece group 17 can transmit visible light; the primary and secondary mirrors have perfect imaging points, and parallel light passes through the system to realize beam shrinking, and the field of view is ±1 degree. The adjustment method requires that the telescope system within the designed field of view range, the wavefront RMS value of each field of view meets the design index, and is symmetrical about the system optical axis. The adjustment process is as follows:

[0046] (1) Measure the primary mirror surface using a laser interferometer and a standard sphere 11, as shown in the light path of Figure 1 , ensure that the parallel light emitted by the interferometer converges at a point after being reflected by the parabolic primary mirror 10, and erect the standard sphere 11 so that the center of the sphere is basically coincident with the light convergence point;

[0047] (2) Iteratively measure the primary mirror angle and the position of the standard sphere 11 during measurement until the RMS value of the primary mirror surface is minimized, at which time the primary mirror optical axis is aligned with the interferometer, and the current primary mirror position is taken as the subsequent adjustment reference;

[0048] (3) Bond the secondary mirror 12 shown in Figure 2 on the secondary mirror bonding threaded head 2 of the special tool 13, and ensure that the back reference surface of the secondary mirror is exposed;

[0049] (4) Screw the secondary mirror to the special tool 13, and install the special tool 13 on the secondary mirror support 14 of the spotting scope system, adjust the reference plane of the secondary mirror 12 to be perpendicular to the measuring light of the interferometer (i.e. ensure that the optical axes of the primary mirror and the secondary mirror are consistent) by placing a gasket between the tool 14 and the secondary mirror 12 support;

[0050] (5) Move the standard ball 11 to the convergence point of the primary mirror and the secondary mirror, measure the wavefront in the central field of view of the primary and secondary mirror system, the measurement path is shown in Figure 3 Based on the values of the coma and the first-order astigmatism of the axial aberration of the measurement results, adjust the X / Y two-degree-of-freedom translation of the secondary mirror relative to the primary mirror, based on the value of the spherical aberration of the measurement results, adjust the Z-direction translation of the secondary mirror relative to the primary mirror, and ensure that the wavefront RMS value of the central field of view of the primary and secondary mirror system is minimized and meets the design requirements;

[0051] (6) Remove the standard ball 11, install the eyepiece group 17 of the spotting scope system, and erect the plane mirror 15 behind the eyepiece group 17, based on the spherical aberration of the wavefront measurement results, adjust the thickness of the gasket below the eyepiece group 17 to ensure the Z-direction spacing of the eyepiece group 17 relative to the primary and secondary mirrors;

[0052] (7) Based on the values of the coma and the first-order astigmatism of the axial aberration of the wavefront measurement results, iteratively adjust the angle of the plane mirror and the X / Y two-degree-of-freedom translation of the eyepiece group 17 to minimize the wavefront of the central field of view of the spotting scope system and meet the design requirements;

[0053] (8) Erect the theodolite to monitor and record the current attitude of the spotting scope system, adjust it to the four positions of the pitch ±1° field of view and the azimuth ±1° field of view, and adjust the plane mirror 15 to compensate for the return image position, measure the wavefront of the edge field of view of the spotting scope system, the measurement path is shown in Figure 4 If the measurement results of the four edge field of view wavefronts meet the design requirements, the adjustment is completed;

[0054] If the measurement results of the edge field of view wavefronts do not all meet the design requirements, adjust the spotting scope system to return to the central field of view, based on the values of the coma and the first-order astigmatism of the axial aberration of the four edge field of view, fine-tune the X / Y two-degree-of-freedom of the eyepiece group, and then perform edge field of view measurement again, which can meet the design requirements and complete the adjustment.

[0055] Reference Figure 2As shown, the secondary mirror adjusting tool adapter of the present embodiment comprises a secondary mirror adjusting tool adapter 1, a secondary mirror bonding threaded head 2, a spring shaft 3, an adjusting tool base 4, an adjusting tool sliding seat 5, an axial adjusting knob 6, an adjusting tool gland 7, a spring 8, a jackscrew 9, and a screw.

[0056] The adjusting tool sliding seat 5 is annular in structure, and the outer and inner circumferential surfaces of one end thereof are both provided with annular protrusions along the circumferential direction. The annular protrusion of the outer circumferential surface is mounted in the large-diameter end of the adjusting tool base 4 and is limited in axial displacement by the adjusting tool gland 7, leaving a moving space along the radial direction. The other end of the adjusting tool sliding seat 5 is provided with an external thread.

[0057] The secondary mirror bonding threaded head 2 is provided with a shaft shoulder at one end and an internal thread at the other end, which extends into the through hole of the secondary mirror adjusting tool adapter.

[0058] The spring shaft 3 is a sleeve structure provided with a shaft shoulder at one end and an external thread at the other end, which extends into the through hole of the adjusting tool gland and is coaxially mounted with the internal thread of the secondary mirror bonding threaded head through the external thread.

[0059] The spring is sleeved on the spring shaft 3 and located between the annular protrusion of the inner circumferential surface of the adjusting tool sliding seat and the shaft shoulder of the spring shaft.

[0060] The axial adjusting knob 6 is annular in structure, provided with an internal thread at one end and a coaxial annular limiting surface at the other end, which is in contact with the outer end surface of the shaft shoulder of the spring shaft and limits the axial displacement thereof. The internal thread of the axial adjusting knob is mounted with the external thread of the adjusting tool sliding seat, and the axial pressure is applied to the spring shaft by screwing, thereby adjusting the axial position, i.e., the Z-direction position, of the outer end surface of the secondary mirror bonding threaded head.

[0061] The outer circumferential surface of the adjusting tool base 4 is uniformly provided with four radial holes along the circumferential direction for mounting the jackscrew. The bottom end of the jackscrew is in contact with the circumferential surface of the annular protrusion of the outer circumferential surface of the adjusting tool sliding seat, and the X / Y-direction position of the adjusting tool sliding seat is adjusted by adjusting the screwing depth.

[0062] The adjusting method of the secondary mirror special tool of the present embodiment comprises the following specific steps:

[0063] 1) Before use, the secondary mirror adjusting tool adapter is mounted on the secondary mirror support of the cassette telescope system with a screw, and then the rest of the tool is mounted on the secondary mirror adjusting tool adapter with a screw.

[0064] 2) The secondary mirror is fixed by ultraviolet curing adhesive between the secondary mirror and the secondary mirror screw head. When the tool is disassembled, the adhesive layer can be dissolved with acetone solution;

[0065] 3) The secondary mirror adjusting tool adapter, the secondary mirror adjusting tool base, the secondary mirror adjusting tool gland and the secondary mirror support are fixed by screws. The spring shaft and the secondary mirror screw head are fixed by thread cooperation.

[0066] 4) The secondary mirror adjusting tool sliding seat is used to adjust the position of the secondary mirror relative to the primary mirror in X / Y direction by acting on the secondary mirror adjusting tool base.

[0067] 5) There is a geometric limit between the spring shaft and the secondary mirror adjusting tool sliding seat. The axial adjusting knob is rotated clockwise to compress the spring, and the spring is relaxed by rotating the axial adjusting knob counterclockwise. The position of the spring shaft and the secondary mirror relative to the primary mirror in Z direction is adjusted.

[0068] 6) The secondary mirror screw head, the spring shaft and the axial adjusting knob are hollow structures, which can open the reference surface on the back of the secondary mirror for monitoring the pointing direction of the secondary mirror optical axis during adjustment.

[0069] 7) The back of the secondary mirror is machined with a polished reference surface, and the perpendicularity between the surface and the secondary mirror optical axis is ≤10″. The pointing direction of the secondary mirror optical axis can be monitored through the surface.

[0070] Preferably, if the deviation between the secondary mirror optical axis and the primary mirror optical axis is ≥10″, copper foil gaskets can be used to adjust the angle on the mating surface of the secondary mirror adjusting tool adapter and the secondary mirror adjusting tool base.

[0071] Preferably, after the secondary mirror is adjusted, the secondary mirror and the secondary mirror support are fixed by glue.

[0072] Preferably, after the glue layer between the secondary mirror and the secondary mirror support is cured, the reference on the back of the secondary mirror is monitored first, and then the special adjusting tool is disassembled. If the reference on the back of the secondary mirror has changed at this time, the secondary mirror needs to be disassembled and reassembled.

[0073] Preferably, after the glue layer between the secondary mirror and the secondary mirror support is cured, the full field wavefront consistency in the current state is not directly measured. The product ocular group or special compensator needs to be installed under the current reference to expand the field angle of the telescope system, and then the edge field wavefront measurement is performed.

[0074] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments without departing from the principles and purposes of the present application within the scope of the present application.

Claims

1. A method for assembling and adjusting a cassette telescope system across the entire field of view, characterized in that... The specific steps are as follows: Step 1: Measure the main mirror surface type by using a laser interferometer and a standard sphere; Step 2: Establish an installation and adjustment reference; Step 3: Install the secondary mirror on the secondary mirror support of the cassette telescope system through a special tool, and ensure that the back reference reflecting surface of the secondary mirror is exposed; Step 4: Adjust the central field wavefront RMS value of the primary-secondary mirror system to meet the requirements; the adjustment method is as follows: move the standard sphere to the primary-secondary mirror convergence point, measure the wavefront under the central field of the primary-secondary mirror system, based on the off-axis aberration values of coma and first-order astigmatism in the measurement results, adjust the X / Y two-degree-of-freedom translation of the secondary mirror relative to the primary mirror, based on the spherical aberration value in the measurement results, adjust the Z-direction translation of the secondary mirror relative to the primary mirror, and ensure that the central field wavefront RMS value of the primary-secondary mirror system is minimized and meets the design requirements; Step 5: Install the eyepiece group; Step 6: Adjust to minimize the central field wavefront of the telescope system; Step 7: Adjust the elevation and azimuth field of view of the cassette telescope system, so that the measurement results of the four edge field wavefronts meet the design requirements, that is, the installation and adjustment are completed. The special tool for the secondary mirror comprises a secondary mirror adjustment tool adapter, a secondary mirror bonding threaded head, a spring shaft, an adjustment tool base, an adjustment tool sliding seat, an axial adjustment knob, an adjustment tool gland, a spring and a jackscrew. The secondary mirror adjustment tool adapter, the adjustment tool base and the adjustment tool gland are coaxially fixed in sequence and have coaxial through holes. The through hole of the adjustment tool base is a stepped hole, the small-diameter end of which faces the secondary mirror adjustment tool adapter, and the large-diameter end of which faces the adjustment tool gland. The adjustment tool sliding seat has an annular structure, the outer and inner circumferential surfaces of one end of which are both provided with annular protrusions in the circumferential direction. The annular protrusion of the outer circumferential surface is mounted in the large-diameter end of the adjustment tool base and is limited in axial displacement by the adjustment tool gland, and a moving space is left in the radial direction. The other end of the adjustment tool sliding seat is provided with external threads. One end of the secondary mirror bonding threaded head is provided with a shaft shoulder, and the other end is provided with internal threads, which extend into the through hole of the secondary mirror adjustment tool adapter. The outer end surface of the shaft shoulder of the secondary mirror bonding threaded head is used for mounting the secondary mirror. The spring shaft has a sleeve structure with a shaft shoulder at one end and external threads at the other end, which extends into the through hole of the adjustment tool gland and is coaxially and fixedly connected to the internal threads of the secondary mirror bonding threaded head through the external threads. The spring is sleeved on the spring shaft and located between the annular protrusion of the inner circumferential surface of the adjustment tool sliding seat and the shaft shoulder of the spring shaft. The axial adjustment knob has an annular structure, one end of which is provided with internal threads, and the other end is provided with a coaxial annular limiting surface. The inner threads of the axial adjustment knob are in contact with the outer end surface of the shaft shoulder of the spring shaft and limit the axial displacement of the shaft shoulder. The internal threads of the axial adjustment knob are matched with the external threads of the adjustment tool sliding seat, and the axial pressure of the spring shaft is applied by screwing, so as to adjust the axial position, that is, the Z-direction position, of the outer end surface of the secondary mirror bonding threaded head. The outer circumferential surface of the adjustment tool base is uniformly provided with four radial holes in the circumferential direction for mounting the jackscrew. The bottom end of the jackscrew is in contact with the circumferential surface of the annular protrusion of the outer circumferential surface of the adjustment tool sliding seat, and the X / Y direction position of the adjustment tool sliding seat is adjusted by adjusting the screwing depth.

2. The method of claim 1, wherein: The step 1, the main mirror is arranged in front of the laser interferometer, and the standard ball is arranged between the main mirror and the laser interferometer, so that the parallel light emitted by the laser interferometer is reflected by the parabolic main mirror and converges at a point, and the standard ball is substantially coincident with the converging point of the measuring light.

3. The method of claim 2, wherein: The step 2, the angle of the main mirror and the position of the standard ball are iterated in the measurement of the step 1 until the RMS value of the main mirror surface is minimum, at this time, the optical axis of the main mirror is aligned with the laser interferometer, and the current position of the main mirror is taken as the subsequent installation reference.

4. The method of claim 3, wherein: The step 3, the shims are installed between the special tooling and the secondary mirror support, and the position of the secondary mirror back reference is adjusted to be perpendicular to the measuring light of the laser interferometer, so that the optical axes of the main mirror and the secondary mirror are consistent.

5. The method of claim 4, wherein: The step 5 installation method is that the standard ball is removed, the eyepiece group of the telescope system is installed, the plane mirror is arranged behind the eyepiece group, the thickness of the shims below the eyepiece group is adjusted based on the spherical aberration of the wavefront measurement result, and the relative Z-direction spacing of the eyepiece group relative to the main mirror and the secondary mirror is ensured.

6. The method of claim 5, wherein: The step 6 adjustment method is that the angle of the plane mirror and the X / Y two-degree-of-freedom translation of the eyepiece group are iteratively adjusted based on the coma and the first-order astigmatism of the wavefront measurement result, so that the wavefront of the central field of view of the telescope system is minimum and meets the design requirements.

7. The method of claim 6, wherein: The step 7 adjustment method is that the theodolite is arranged to monitor and record the current posture of the detachable telescope system, the detachable telescope system is adjusted to four positions of the elevation ± 1° field of view and the azimuth ± 1° field of view, the plane mirror is adjusted to compensate the return image position, and the wavefront of the edge field of view of the detachable telescope system is measured. If the wavefront measurement results of the four edge fields of view meet the design requirements, the installation and adjustment are completed. If the wavefront measurement results of the edge fields of view do not all meet the design requirements, the detachable telescope system is adjusted to return to the central field of view, the X / Y two-degree-of-freedom of the eyepiece group is finely adjusted based on the coma and the first-order astigmatism of the four edge fields of view, and then the edge field measurement is performed again, that is, the design requirements are met, and the installation and adjustment are completed.

8. The method of claim 1-7, wherein the method is a method of assembling the secondary mirror tooling of the full field of view assembly method of the catadioptric system of any one of claims 1-7, wherein the method comprises: assembling the secondary mirror tooling of the full field of view assembly method of the catadioptric system of any one of claims 1-7. The specific steps are as follows: Step 1: Before the tooling is used, the secondary mirror adjustment tooling adapter is installed on the secondary mirror support of the detachable telescope system by screws, and the rest of the tooling is installed on the secondary mirror adjustment tooling adapter by screws; the secondary mirror adjustment tooling adapter, the tooling base, and the tooling gland are fixed as a whole by screws; the spring shaft and the secondary mirror adhesive threaded head are fixed as a whole by thread cooperation; Step 2: The secondary mirror is fixed on the secondary mirror adhesive threaded head by ultraviolet curing glue; When the tooling is disassembled, the glue layer is dissolved by using acetone solution; Step 3: The adjustment tooling sliding seat is two-dimensionally translated in the adjustment tooling base through the action of four jacks, and the X / Y direction position of the secondary mirror relative to the main mirror is adjusted; Step 4: Due to the geometric limitation between the spring shaft and the adjustment tooling sliding seat, clockwise rotation of the axial adjustment knob compresses the spring, and counterclockwise rotation of the spring releases the spring, so that the Z direction position of the spring shaft and the secondary mirror relative to the main mirror is adjusted.

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