CN204086655U - The large-caliber off-axis optical system of the passive heat difference that disappears - Google Patents
The large-caliber off-axis optical system of the passive heat difference that disappears Download PDFInfo
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- CN204086655U CN204086655U CN201420481526.1U CN201420481526U CN204086655U CN 204086655 U CN204086655 U CN 204086655U CN 201420481526 U CN201420481526 U CN 201420481526U CN 204086655 U CN204086655 U CN 204086655U
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- Prior art keywords
- mirror
- cell
- primary mirror
- framework
- primary
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- 230000003287 optical effect Effects 0.000 title claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims description 25
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- 239000004411 aluminium Substances 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 239000010962 carbon steel Substances 0.000 claims description 10
- 229910052738 indium Inorganic materials 0.000 claims description 10
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000011521 glass Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910000617 Mangalloy Inorganic materials 0.000 claims description 2
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 2
- 239000004677 Nylon Substances 0.000 claims description 2
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 2
- QFGIVKNKFPCKAW-UHFFFAOYSA-N [Mn].[C] Chemical compound [Mn].[C] QFGIVKNKFPCKAW-UHFFFAOYSA-N 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- Optical Elements Other Than Lenses (AREA)
Abstract
The utility model discloses a kind of large-caliber off-axis optical system of the passive heat difference that disappears, comprising: displacement compensating mechanism, the secondary mirror mirror cell being provided with secondary mirror, connecting frame, primary mirror framework, the primary mirror mirror cell of primary mirror is installed; The bottom of described displacement compensating mechanism and described secondary mirror mirror cell is connected, and described primary mirror framework and described primary mirror mirror cell are connected, and are connected between described primary mirror framework with described secondary mirror mirror cell by connecting frame.System described in the utility model, by arranging displacement compensating mechanism, the system interval that displacement compensating mechanism can cause temperature carries out full remuneration, effectively ensure that the not temperature variant characteristic of the picture element of system, thus it is simple to make native system install, and does not increase the volume of original system, weight and cost.
Description
Technical field
The utility model relates to reflective optical system field, particularly relates to a kind of large-caliber off-axis optical system of the passive heat difference that disappears.
Background technology
At present, the optical system worked in complex environment will stand very large variation of ambient temperature, typically can reach-20 DEG C to+60 DEG C.In temperature environment jumpy, optical system due to the thermal instability of optical material and structured material, can cause the focal length of system, image planes position, and image quality etc. changes.The optical system employing of transmission-type is passive eliminates the comparatively perfect of the technical development of thermal effect with active mode, and the application on equipment is also very extensive.Along with the development of technology and the needs of telekinesy, the heat that disappears of large-caliber off-axis reflective optical system is poor and progressively come into one's own without thermalization technology.But, by the restriction of optical material and spatial volume, current domestic large-caliber off-axis reflective optics still there is no widespread use without thermalized design.
The optical element number of off-axis reflection optical system is few and material is single, and the physical construction that installation is fixed is bulky, complex structure.The hot difference method that disappears of optical passive mode and mechanical active type, adds the volume of original system, weight and cost, and mechanical active type compensation method, owing to adding temperature sensor, also can cause lag-effect.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of large-caliber off-axis optical system of the passive heat difference that disappears, in order to solve the shortcoming of the hot difference method that disappears of prior art optical passive mode and mechanical active type, add the problem of the volume of original system, weight and cost.
For solving the problems of the technologies described above, the utility model provides a kind of large-caliber off-axis optical system of the passive heat difference that disappears, and it comprises: displacement compensating mechanism, the secondary mirror mirror cell being provided with secondary mirror, connecting frame, primary mirror framework, be provided with the primary mirror mirror cell of primary mirror; The bottom of described displacement compensating mechanism and described secondary mirror mirror cell is connected, and described primary mirror framework and described primary mirror mirror cell are connected, and are connected between described primary mirror framework with described secondary mirror mirror cell by connecting frame.
Further, described displacement compensating mechanism comprises aluminium block, nylon, resin; Described primary mirror framework comprises carbon steel framework, stainless steel frame, carbon manganese steel framework; Described connecting frame comprises indium steel frame, magnesium alloy frame, titanium alloy frame.
Further, described aluminium block length is 64 millimeters, and described carbon steel lengths of frame is 120 millimeters, and described indium steel frame length is 641 millimeters.
Optionally, described primary mirror mirror cell, described secondary mirror mirror cell are prepared by carbon steel material.
Optionally, described primary mirror, described secondary mirror are prepared by low-expansion optical material.
Further, described low-expansion optical material comprises devitrified glass, silit and quartz glass.
Optionally, described primary mirror is ellipsoid primary mirror, and described secondary mirror is parabola secondary mirror.
The utility model beneficial effect is as follows:
System described in the utility model, by arranging displacement compensating mechanism, the system interval that displacement compensating mechanism can cause temperature carries out full remuneration, effectively ensure that the not temperature variant characteristic of the picture element of system, thus it is simple to make native system install, and does not add the volume of original system, weight and cost.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present utility model;
Fig. 2 is the compensation calculation principle schematic of the passive heat difference that disappears of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is further elaborated.
Embodiment 1: as shown in Figure 1, a kind of passive large-caliber off-axis optical system disappearing heat difference comprises: displacement compensating mechanism 1, the secondary mirror mirror cell 2 being provided with parabola secondary mirror 3, connecting frame 4, primary mirror framework 5, be provided with the primary mirror mirror cell 7 of ellipsoid primary mirror 6; Displacement compensating mechanism 1 is (identical with direction shown in accompanying drawing with the bottom of secondary mirror mirror cell 2, the top of secondary mirror mirror cell 2 is provided with secondary mirror 3, the bottom of secondary mirror mirror cell 2 is back to the top of secondary mirror mirror cell 2) be connected, primary mirror framework 5 and primary mirror mirror cell 7 are connected, and are connected between primary mirror framework 5 with secondary mirror mirror cell 2 by connecting frame 4; Parabola secondary mirror 3, ellipsoid primary mirror 6 all adopt devitrified glass to make, the carbon steel framework that primary mirror framework 5 is made for carbon steel material, its length is 120 millimeters, the indium steel frame that connecting frame 4 is made for indium Steel material, its length is 641 millimeters, displacement compensating mechanism 1 is made for aluminium block, and its length is 64 millimeters.
In the present embodiment, the bottom of secondary mirror mirror cell 2 arranges displacement compensating mechanism 1, and the system interval that displacement compensating mechanism 1 can cause temperature carries out full remuneration, and it is simple that native system is installed, and do not add the volume of original system, weight and cost; The not temperature variant characteristic of optical element face shape of optical system is ensured by the material adapted of optical element and optics mirror cell and indium steel frame, primary mirror framework, aluminium block structure, effectively ensure that the not temperature variant characteristic of the picture element of system, the heat that disappears difference characteristic is realized, without the need to focusing by above-mentioned mechanical passive type structure.
For reflective optics, the impact of temperature variation shows in the change of airspace mirror spacing between reflecting mirror surface shape and mirror.The change of reflecting mirror surface shape is caused by the thermal expansion of optical element and mirror cell, and the change of mirror spacing is then caused by the physical construction connecting optical element.
For reflecting mirror surface shape because the change of temperature variation generation, the present embodiment adopts following scheme to overcome:
Ellipsoid primary mirror and parabola secondary mirror adopt devitrified glass, and primary mirror cell and time mirror cell adopt carbon steel material.When catoptron and mirror cell combine with this bi-material, system Gauss image planes variation with temperature value is listed in 1.
Table 1
According to the data of table 1, when system temperature changes between-20 DEG C ~+60 DEG C, the change of image planes is all less than system 1/4 λ ripple difference, by Rayleigh criterion, can think that system is along with the basic aberrationless of temperature variation; Ellipsoid primary mirror and parabola secondary mirror are except adopting devitrified glass, and can also adopt other low-expansion optical materials, this type of optical material also comprises silit and quartz glass.Compared with ordinary optical materials (K9 glass), the coefficient of linear thermal expansion of this type of material will a low order of magnitude, so be referred to as low-expansion optical material, existing the coefficient of linear thermal expansion of these 3 kinds of materials is listed K9:3.3 × 10
-6c
-1; Quartz glass: 0.6 × 10
-6c
-1; SiC:0.7 × 10
-6c
-1; Devitrified glass: 0.5 × 10
-6c
-1.
For airspace mirror spacing between mirror because the change of temperature variation generation, the present embodiment adopts following scheme to overcome:
As shown in Figure 2, the compensation calculation principle of the passive heat difference that disappears of summary the utility model, is located by primary mirror framework 5 and connecting frame 4 between primary and secondary mirror.401 is the temperature variant change in displacement direction of connecting frame 4, and connecting frame 4 adopts indium Steel material, and the coefficient of linear thermal expansion of indium Steel material is α=5 × 10
-7/ DEG C, long L1mm; 501 is the temperature variant change in displacement direction of primary mirror framework 5, and primary mirror framework adopts carbon steel material, and long L2mm, coefficient of linear thermal expansion is β=100 × 10
-7/ DEG C.During system, determine the length of primary mirror framework and indium steel frame, so according to the temperature variant situation Δ of following formulae discovery system spacing
1,
Δ
1＝α×L1+β×L2
Adopt displacement compensating mechanism 1 bucking-out system spacing change further at secondary mirror end, in figure, 101 is the temperature variant change in displacement direction of displacement compensating mechanism 1.Displacement compensating mechanism 1 is prepared for aluminium block, and the long L3 of aluminium block material, coefficient of linear thermal expansion is γ=236 × 10
-7/ DEG C.Calculate the system spacing changes delta that aluminium block causes
2,
Δ
2＝γ×L3
Make Δ
1=Δ
2, then the interval variation of system can full remuneration.Namely
α×L1+β×L2＝γ×L3
One preferred embodiment of said method is shown with following table 2:
Table 2
The data of table 2 obtain according to above interval compensates formulae discovery, and adopt displacement compensating mechanism 1 prepared by 64mm aluminium block, the system interval that can cause temperature carries out full remuneration.Effectively ensure that the not temperature variant characteristic of the picture element of system.
It is last that it is noted that the present embodiment is only in order to illustrate the utility model, unrestricted technology described in the utility model puts case; Therefore, although this instructions has been described in detail with reference to the above embodiments, those of ordinary skill in the art should be appreciated that and still can modify to the utility model or replace; Any improvement not departing from technical solutions of the utility model, is all covered by the interest field required by the utility model.
Claims (7)
1. a large-caliber off-axis optical system for the passive heat difference that disappears, is characterized in that, comprising: displacement compensating mechanism, the secondary mirror mirror cell being provided with secondary mirror, connecting frame, primary mirror framework, be provided with the primary mirror mirror cell of primary mirror; The bottom of described displacement compensating mechanism and described secondary mirror mirror cell is connected, and described primary mirror framework and described primary mirror mirror cell are connected, and are connected between described primary mirror framework with described secondary mirror mirror cell by connecting frame.
2. the system as claimed in claim 1, is characterized in that, described displacement compensating mechanism comprises aluminium block, nylon, resin; Described primary mirror framework comprises carbon steel framework, stainless steel frame, carbon manganese steel framework; Described connecting frame comprises indium steel frame, magnesium alloy frame, titanium alloy frame.
3. system as claimed in claim 2, it is characterized in that, described aluminium block length is 64 millimeters, and described carbon steel lengths of frame is 120 millimeters, and described indium steel frame length is 641 millimeters.
4. the system as claimed in claim 1, is characterized in that, described primary mirror mirror cell, described secondary mirror mirror cell are prepared by carbon steel material.
5. the system as claimed in claim 1, is characterized in that, described primary mirror, described secondary mirror are prepared by low-expansion optical material.
6. system as claimed in claim 5, it is characterized in that, described low-expansion optical material comprises devitrified glass, silit, quartz glass.
7. the system as claimed in claim 1, is characterized in that, described primary mirror is ellipsoid primary mirror, and described secondary mirror is parabola secondary mirror.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420481526.1U CN204086655U (en) | 2014-08-25 | 2014-08-25 | The large-caliber off-axis optical system of the passive heat difference that disappears |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420481526.1U CN204086655U (en) | 2014-08-25 | 2014-08-25 | The large-caliber off-axis optical system of the passive heat difference that disappears |
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| Publication Number | Publication Date |
|---|---|
| CN204086655U true CN204086655U (en) | 2015-01-07 |
Family
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|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166217A (en) * | 2014-08-25 | 2014-11-26 | 中国电子科技集团公司第十一研究所 | Large-aperture off-axis optical system and passive athermal method |
| CN107991747A (en) * | 2017-09-15 | 2018-05-04 | 北京仿真中心 | A kind of optical system is without thermalization mechanical device |
| CN110018547A (en) * | 2018-01-09 | 2019-07-16 | 北京振兴计量测试研究所 | The passive athermal device of machinery for wide temperature range infrared collimator |
-
2014
- 2014-08-25 CN CN201420481526.1U patent/CN204086655U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166217A (en) * | 2014-08-25 | 2014-11-26 | 中国电子科技集团公司第十一研究所 | Large-aperture off-axis optical system and passive athermal method |
| CN107991747A (en) * | 2017-09-15 | 2018-05-04 | 北京仿真中心 | A kind of optical system is without thermalization mechanical device |
| CN107991747B (en) * | 2017-09-15 | 2024-03-19 | 北京仿真中心 | Athermalization mechanical device of optical system |
| CN110018547A (en) * | 2018-01-09 | 2019-07-16 | 北京振兴计量测试研究所 | The passive athermal device of machinery for wide temperature range infrared collimator |
| CN110018547B (en) * | 2018-01-09 | 2021-06-18 | 北京振兴计量测试研究所 | Mechanical passive heat difference eliminating device for wide temperature range infrared collimator |
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