CN110531531A - The Method of Adjustment of Cassegrain optical system primary and secondary reflecting mirror - Google Patents
The Method of Adjustment of Cassegrain optical system primary and secondary reflecting mirror Download PDFInfo
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- CN110531531A CN110531531A CN201910923731.6A CN201910923731A CN110531531A CN 110531531 A CN110531531 A CN 110531531A CN 201910923731 A CN201910923731 A CN 201910923731A CN 110531531 A CN110531531 A CN 110531531A
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- secondary mirror
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/62—Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
- G02B7/1822—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors comprising means for aligning the optical axis
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mounting And Adjusting Of Optical Elements (AREA)
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Abstract
The Method of Adjustment of Cassegrain optical system primary and secondary reflecting mirror belongs to optics integration techno logy more particularly to a kind of Method of Adjustment of Cassegrain optical system primary and secondary mirror.The method of the present invention, including adjustment, secondary mirror adjustment and the primary and secondary mirror separation adjustment step to principal reflection mirror.Technology of the invention, on the one hand by designing an artistic spherical to secondary mirror, the centering adjustment to lens is converted by the centering adjustment to secondary mirror, to avoid the limitation of align measurement instrument working principle, is allowed to the high-precision adjustment suitable for non-spherical reflector.On the other hand precise measurement is carried out using interval of the align measurement instrument non-contact measurement function to primary and secondary reflecting mirror.It is generally applicable to each wave band optical system such as visible light, infrared, adjustment efficiency is higher.
Description
Technical field
The invention belongs to optics integration techno logy more particularly to a kind of Method of Adjustment of Cassegrain optical system primary and secondary mirror.
Background technique
Cassegrain optical system, which has, can be achieved heavy caliber, long-focus, wide spectrum, is easy to lightweight, thermal adaptability
The advantages that strong, is widely used in the fields such as aerospace, military affairs.Cassegrain optical system includes two reflecting mirrors, main
Mirror be it is recessed aspherical, secondary mirror be it is convex aspherical, two reflecting mirror axle center are arranged on optical axis, and the mirror surface center of primary mirror is opened
Hole can allow light to pass through.The adjustment quality of Cassegrain optical system primary and secondary mirror can greatly influence the imaging of whole system
Quality.Therefore, the primary and secondary mirror integration techno logy of Cassegrain optical system is one of research hotspot of optical field.
Currently, the adjustment of Cassegrain system is mainly realized by the following method both at home and abroad: collimator Method of Adjustment is determined
Heart turning Method of Adjustment, method, the method for Computer Aided Assembly Process Planning, interferometer that centering adjustment is carried out using three-coordinates measuring machine
Method of Adjustment, align measurement instrument centering Method of Adjustment etc..Wherein, align measurement instrument is due to measurement accuracy height, adjustment efficiency
Height is relatively conventional resetting equipment, but since align measurement instrument can only measure the corresponding centre of sphere deviation of spherical surface, and can not be surveyed
Aspherical optical axis deviation is measured, therefore in the case where optical element, structural member error accumulation, adjustment precision is restricted, often
It is difficult to meet the adjustment required precision of high-precision Cassegrain system.
Summary of the invention
The purpose of the present invention is overcoming align measurement instrument that can only measure the limitation of spherical surface, a kind of high-precision card plug is provided
The Method of Adjustment of Green's optical system primary and secondary reflecting mirror.
The Method of Adjustment of Cassegrain optical system primary and secondary reflecting mirror of the present invention, including the adjustment, secondary anti-to principal reflection mirror
Penetrate mirror adjustment and primary and secondary mirror separation adjustment, which is characterized in that one artistic spherical of design is needed in secondary mirror；Its
In,
The adjustment of principal reflection mirror the following steps are included:
S1: leveling principal reflection mirror, and an optical parallel is placed right above principal reflection mirror, by the inclination for adjusting workbench
Make the rotary reference axis high perpendicular of optical parallel and workbench；
S2: feeling relieved to principal reflection mirror, removes optical parallel, selects suitably additional object lens, measures the song of principal reflection mirror surface
The bias of rate center relative rotation reference axis, the translation by adjusting workbench control the bias of the center of curvature to adjustment
In required precision；
The adjustment of primary and secondary mirror separation the following steps are included:
S1: secondary mirror is centrally placed on corresponding mounting surface by support frame；
S2: measurement tooling is connected with glazing road measuring head, the height of measurement tooling is adjusted, is parked in it away from artistic spherical
At square 50mm, the spheric reflection picture of lens upper surface is shown, adjusting to focus keeps the picture clearly and most thin, will measure tooling height at this time
Scale is denoted as h, h=0；
S3: removing secondary mirror and support frame, and an optical parallel is placed right above principal reflection mirror, reduces the height of measurement tooling
Degree is parked in it above anomaly optical parallel at 50mm, shows optical parallel reflection image, and adjusting keeps the picture clearly and most thin, this moment
Tooling height is H, then secondary mirror lower surface is optical parallel thickness to H+D-E, D is divided between principal reflection mirror edge, and E is secondary
Mirror center thickness；
S4: checking whether above-mentioned interval meets the requirements, and meets then adjustment qualification, anti-in support frame and master if being unsatisfactory for requiring
The gasket penetrated between mirror makes adjustment interval, meets the requirements it；
Secondary mirror adjustment the following steps are included:
S1: two measuring heads above and below setting select the suitably additional object lens of focal length respectively, and respectively two above and below measurement secondary mirror
The corresponding center of curvature O in a surface1And O2The bias of relative rotation reference axis；
S2: being adjusted the position of secondary mirror, until the corresponding center of curvature O in two surfaces above and below secondary mirror1And O2
The bias of relative rotation reference axis meets the requirement of adjustment precision；
S3: being filled into the gap of secondary mirror and support frame with glue, which is fixed.
The artistic spherical and secondary mirror overall processing forms, and is one spherical surface of design for adjustment needs,
Artistic spherical is not involved in the imaging of optical system.Primary and secondary reflecting mirror is typically all that lighttight aluminium alloy is process.
The additional object lens are an attachmentes on align measurement instrument, the suitably additional object lens of focal length to help in
The inclined measuring instrument of the heart finds the reflection image at tested curvature of curved surface center, to measure the deviation of center of curvature relative rotation reference axis
Amount.
The inclination and translation for referring to fine tuning secondary mirror is adjusted in the position of the secondary mirror, and heeling condition can lead to
It crosses and drags the ultra-thin adhesive tape of planar pad to realize in secondary mirror, translation state can be by moving horizontally secondary mirror come real
It is existing.
Technology of the invention, on the one hand by designing an artistic spherical to secondary mirror, by the centering to secondary mirror
Adjustment is converted into the centering adjustment to lens, to avoid the limitation of align measurement instrument working principle, is allowed to be suitable for
The high-precision adjustment of non-spherical reflector.On the other hand using align measurement instrument non-contact measurement function to primary and secondary reflecting mirror
Interval carry out precise measurement.It is generally applicable to each wave band optical system such as visible light, infrared, adjustment efficiency is higher.
Figure of description
Fig. 1 is time emitting surface structural schematic diagram.
Fig. 2 is the secondary mirror structural schematic diagram for having added artistic spherical.
Fig. 3 is that principal reflection mirror carries out leveling schematic diagram.
Fig. 4 is that principal reflection mirror carries out centering schematic diagram.
Fig. 5 is secondary mirror upper level instrumentation plan.
Fig. 6 is optical parallel upper level instrumentation plan.
Fig. 7 is secondary mirror adjustment schematic diagram.
Fig. 8 is secondary mirror and support frame enlarged drawing in secondary mirror adjustment schematic diagram.
Wherein, secondary mirror 1, artistic spherical 2, measuring head 3 add object lens 4, optical parallel 5, principal reflection mirror 6, support frame
7, rotary reference axis 8 measures tooling 9, workbench 10, glue 11.
Specific embodiment
The Method of Adjustment of 1: Sai Gelin optical system primary and secondary reflecting mirror of embodiment, specifically include adjustment to principal reflection mirror,
Secondary mirror adjustment and primary and secondary mirror separation adjustment.
Firstly, needing one artistic spherical of design in secondary mirror, artistic spherical and secondary mirror overall processing are formed, and are
In order to meet the spherical surface for using align measurement instrument and designing, artistic spherical is not involved in the imaging of optical system.Primary and secondary is anti-
It penetrates mirror to be process using lighttight aluminium alloy, artistic spherical also uses aluminium alloy, is processed by shot blasting after processing.
Second, carrying out principal reflection mirror adjustment, the specific steps are as follows:
S1: principal reflection mirror is fixed on its workbench 10 by starting visible light double light path align measurement instrument；
S2: leveling principal reflection mirror, and an optical parallel 5 is placed right above principal reflection mirror 6, by adjusting workbench 10
Inclination makes 8 high perpendicular of rotary reference axis of optical parallel 5 Yu workbench 10；
S3: feeling relieved to principal reflection mirror, removes optical parallel 5, selects suitably additional object lens 4, measurement principal reflection mirror surface
The bias of center of curvature relative rotation reference axis 8, the translation by adjusting workbench 10 control the bias of the center of curvature
Into adjustment required precision.
Third, the adjustment of primary and secondary mirror separation is carried out, specifically includes the following steps:
S1: installation support frame 7；
S2: secondary mirror 1 is centrally placed on corresponding mounting surface by support frame 7；
S3: measurement tooling 9 is connected with glazing road measuring head 3, is surveyed by the manipulation software adjustment that align measurement instrument carries
The height for measuring tooling 9 is parked in it away from 50mm above secondary mirror, and the display screen in software interface shows table on lens at this time
The spheric reflection picture in face, adjusting to focus keeps the picture clearly and most thin, and will measure the tooling number of altitude at this time is h, h=0；
S4: removing secondary mirror and support frame, and an optical parallel 5 is placed right above principal reflection mirror 6, reduces measurement tooling 9
Highly, it is parked in it at 5 top 50mm of anomaly optical parallel, the display screen in software interface shows 5 reflection image of optical parallel at this time,
Adjusting keeps the picture clearly and most thin, and tooling height is H this moment, then secondary mirror lower surface is divided into H+ between principal reflection mirror edge
D-E, D are optical parallel thickness, and E is secondary mirror center thickness；
S5: checking whether above-mentioned interval meets the requirements, and meets then adjustment qualification, anti-in support frame 7 and master if being unsatisfactory for requiring
The gasket penetrated between 6 mirrors makes adjustment interval, meets the requirements it.
Fourth, to secondary mirror adjustment, specifically includes the following steps:
S1: being arranged two measuring heads 3 up and down, selects the suitably additional object lens 4 of focal length respectively, and measure in secondary mirror 1 respectively
The corresponding center of curvature O in lower two surfaces1And O2The bias of relative rotation reference axis 8；
S2: being adjusted the position of secondary mirror 1, until about 1 two corresponding center of curvature O in surface of secondary mirror1With
O2The bias of relative rotation reference axis 8 meets adjustment requirement；
S3: being filled into the gap of secondary mirror 1 and support frame 7 with glue 11, which is fixed.
By above-mentioned steps, the adjustment to Cassegrain optical system primary and secondary reflecting mirror is realized.
Different optical systems require primary and secondary mirror separation and adjustment required precision is different, therefore, can be according to designer
Demand, using the above embodiment of the present invention method carry out adjustment, to realize high efficiency adjustment.
Claims (2)
1. the Method of Adjustment of Cassegrain optical system primary and secondary reflecting mirror, including adjustment, the secondary mirror adjustment to principal reflection mirror,
And primary and secondary mirror separation adjustment, which is characterized in that one artistic spherical of design is needed in secondary mirror；Wherein,
The adjustment of principal reflection mirror the following steps are included:
S1: leveling principal reflection mirror, and an optical parallel is placed right above principal reflection mirror, by the inclination for adjusting workbench
Make the rotary reference axis high perpendicular of optical parallel and workbench；
S2: feeling relieved to principal reflection mirror, removes optical parallel, selects suitably additional object lens, measures the song of principal reflection mirror surface
The bias of rate center relative rotation reference axis, the translation by adjusting workbench control the bias of the center of curvature to adjustment
In required precision；
The adjustment of primary and secondary mirror separation the following steps are included:
S1: secondary mirror is centrally placed on corresponding mounting surface by support frame；
S2: measurement tooling is connected with glazing road measuring head, the height of measurement tooling is adjusted, is parked in it away from artistic spherical
At square 50mm, the spheric reflection picture of lens upper surface is shown, adjusting to focus keeps the picture clearly and most thin, will measure tooling height at this time
Scale is denoted as h, h=0；
S3: removing secondary mirror and support frame, and an optical parallel is placed right above principal reflection mirror, reduces the height of measurement tooling
Degree is parked in it above anomaly optical parallel at 50mm, shows optical parallel reflection image, and adjusting keeps the picture clearly and most thin, this moment
Tooling height is H, then secondary mirror lower surface is optical parallel thickness to H+D-E, D is divided between principal reflection mirror edge, and E is secondary
Mirror center thickness；
S4: checking whether above-mentioned interval meets the requirements, and meets then adjustment qualification, anti-in support frame and master if being unsatisfactory for requiring
The gasket penetrated between mirror makes adjustment interval, meets the requirements it；
Secondary mirror adjustment the following steps are included:
S1: two measuring heads above and below setting select the suitably additional object lens of focal length respectively, and respectively two above and below measurement secondary mirror
The corresponding center of curvature O in a surface1And O2The bias of relative rotation reference axis；
S2: being adjusted the position of secondary mirror, until the corresponding center of curvature O in two surfaces above and below secondary mirror1And O2Phase
Meet the requirement of adjustment precision to the bias of rotary reference axis；
S3: being filled into the gap of secondary mirror and support frame with glue, which is fixed.
2. the Method of Adjustment of Cassegrain optical system primary and secondary reflecting mirror as described in claim 1, it is characterised in that described
Artistic spherical and secondary mirror overall processing form.
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| CN201910923731.6A CN110531531B (en) | 2019-09-27 | 2019-09-27 | Method for assembling and adjusting primary and secondary reflectors of Cassegrain optical system |
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| CN112817117A (en) * | 2020-12-28 | 2021-05-18 | 西南技术物理研究所 | Parabolic reflector auxiliary device with auto-collimation adjusting function |
| CN114438429A (en) * | 2021-12-21 | 2022-05-06 | 哈尔滨新光光电科技股份有限公司 | All-aluminum reflector treatment process and Cassegrain optical system |
| CN115166970A (en) * | 2022-07-27 | 2022-10-11 | 茂莱（南京）仪器有限公司 | Method for precisely adjusting wavefront of high-reflection system by using interferometer |
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