CN101285930A - Multi-focus multi-visual field shielding-free total reflection astigmation free optical system - Google Patents
Multi-focus multi-visual field shielding-free total reflection astigmation free optical system Download PDFInfo
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- CN101285930A CN101285930A CNA2008100383249A CN200810038324A CN101285930A CN 101285930 A CN101285930 A CN 101285930A CN A2008100383249 A CNA2008100383249 A CN A2008100383249A CN 200810038324 A CN200810038324 A CN 200810038324A CN 101285930 A CN101285930 A CN 101285930A
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Abstract
The invention discloses a multi-focus multi-field coverage unscreened total reflection stigmatic optical system which is characterized in that: the invention comprises two lens groups; a first lens group comprises a main reflector and an auxiliary reflector; the second lens group comprises two or a plurality of third reflectors; any one of the third reflectors in the second lens group and the first lens group form a three-mirror reflective stigmatic optical system. Because curvatures and positions, the curvatures and aspherical higher order terms, or the curvatures, the positions and the aspherical higher order terms of the plurality of third reflectors in the second lens group are all different, the multi-focus multi-field coverage optical system is realized.
Description
Technical field
The invention belongs to field of optical systems, relate in particular to the anastigmatic optical system of multi-focus multi-visual field shielding-free total reflection.
Background technology
Because the bore of transmission material is limited, reflective optical system is being brought into play important effect in space to ground is observed the outer space.Wherein Korsch is at US.4, and disclosed three reflection astigmation free optical system compact conformations in 101,195, picture element are good, use more and more widely.The spatial observation instrument is generally more than one, and carries out luminous energy by a primary optical system and collect.COOK LACY.G is respectively at EP.0,364,951 (US.4,993,818) and US.4,964,706 disclose many focal lengths, three reflection astigmation free optical systems of many visual fields, system architecture is simple, picture element is excellent, difference by the 3rd reflector position (and the interval between secondary mirror) and aspheric surface high-order term realizes many focal lengths and many visual fields optical system respectively, promptly can directly in the primary optical system harvest energy, finish many focal length observations, be specially adapted to the needs of visible and infrared different wave length to different F#, but the disclosed optical system of COOK LACY.G adopts secondary mirror that there is the optical texture of primary occlusion in principal reflection mirror, and ssystem transfer function is reduced greatly.
Summary of the invention
The object of the present invention is to provide a kind of multi-focus multi-visual field shielding-free total reflection astigmatoscope optical system that disappears, solve the problem of the primary occlusion that previous optical system exists.
The disclosed a kind of many focal lengths of this patent, multi-visual field shielding-free total reflection astigmation free mirror optical system is characterized in that comprising two mirror groups as shown in Figure 1, and the first mirror group G1 comprises principal reflection mirror 2 and secondary mirror 3; The second mirror group G2 comprises two or more the 3rd catoptron 4-1,4-2,4-3, and any one the 3rd catoptron among the second mirror group G2 and the first mirror group G1 form one three anti-astigmation free optical system.Because the curvature of a plurality of the 3rd catoptrons is all different with position, curvature and aspheric surface high-order term or curvature, position and aspheric surface high-order term three in the second mirror group, realizes the optical system of many focal lengths, many visual fields.Between two or more the 3rd catoptrons of the first mirror group G1 and the second mirror group G2, place the relative system optical axis respectively the plane mirror at certain inclination angle (BP1, BP2 in as accompanying drawing 2 are arranged; CP1, CP2 in the accompanying drawing 3) make compact conformation.The first mirror group G1 is Polaroid to incident beam, images in diverse location once more through different plane mirrors and the 3rd catoptron again, realizes the optical system of different focal and visual field.
The disclosed optical system of this patent has adopted high order aspheric surface, and its asphericity coefficient should satisfy following formula:
The even face:
The odd face:
Wherein, z is the rise of aspheric surface on optical axis direction, and Cr is the curvature of aspheric surface, and k is a conic constants, and y is the radial distance of aspheric surface, and A, B, C, D and a, b, c, d are respectively the high-order term asphericity coefficients of aspheric surface.
The disclosed many focal lengths of this patent, multi-visual field shielding-free total reflection astigmation free mirror optical system because system adopts each mirror optical axis coaxial, thereby make resetting difficulty lower; In addition, system does not have the aperture and blocks and improve ssystem transfer function greatly.
Described in feature of the present invention such as claims, its advantage is as follows:
1. system does not have the aperture and blocks and improve ssystem transfer function greatly;
2. principal reflection mirror, secondary mirror and two or more coaxial helping of the 3rd catoptron debug;
3. adopt folding level crossing, made the system architecture compactness, reduced system's physical dimension;
With the two or more limited F of different the 3rd catoptron reality
#The back photosystem is simplified in imaging, effectively reduces system's physical dimension and weight, improves optical efficiency.
Description of drawings
Fig. 1 is many focal lengths, multi-visual field shielding-free total reflection astigmation free optical system structural representation, and G1, G2 represent two mirror groups in the optical system; 1 is the parallel beam from distant place object; 2 is principal reflection mirror, and 3 all belong to the first mirror group for secondary mirror; 4-1,4-2,4-3 are respectively in the second mirror group the 3rd catoptron in the light path of different focal visual field; The image planes of 5-1,5-2, the different visual fields of 5-3 different focal.
Fig. 2 is many focal lengths, multi-visual field shielding-free total reflection astigmation free optical system structural drawing, and B1 is the parallel beam from distant place object; B2 is a principal reflection mirror; B3 is a secondary mirror; BP1, BP2 are respectively two different focal length light path midplane catoptrons; B4-1, B4-2 are respectively the 3rd catoptron in the two different focal length light paths; B5-1, B5-2 are respectively the imaging optical path focal plane of two different focal lengths; BD1 be the primary and secondary mirror pitch from; BD2-1, BD2-2 are respectively the distance between secondary reflection and plane mirror in the two different focal length light paths; BD3-1, BD3-2 are respectively the distance between two different focal length light path midplane catoptron to the three catoptrons; BD4-1, BD4-2 are respectively in the imaging optical path of two different focal lengths distance between the 3rd catoptron and image planes; BDe1, BDe2, BDe3-1, BDe3-2 are respectively the distance that optical axis is departed from the 3rd mirror aperture in principal reflection mirror, the different focal length light paths with two of inferior transmitting mirror.
Fig. 3 is many focal lengths, multi-visual field shielding-free total reflection astigmation free optical system structural drawing, and C1 is the parallel beam from distant place object; C2 is a principal reflection mirror; C3 is a secondary mirror; CP1, CP2 are respectively two different focal length light path midplane catoptrons; C4-1, C4-2 are respectively the 3rd catoptron in the two different focal length light paths; C5-1, C5-2 are respectively the imaging optical path focal plane of two different focal lengths; CD1 be the primary and secondary mirror pitch from; CD2-1, CD2-2 are respectively the distance between secondary mirror and plane mirror in the two different focal length light paths; CD3-1, CD3-2 are respectively the distance between two different focal length light path midplane catoptrons and the 3rd catoptron; CD4-1, CD4-2 are respectively in the imaging optical path of two different focal lengths distance between the 3rd catoptron and image planes; CDe1, CDe2, CDe3-1, CDe3-2 are respectively the distance that optical axis is departed from the 3rd mirror aperture in principal reflection mirror, the different focal length light paths with two of inferior transmitting mirror.
The instantiation mode
Example 1:
According to optical texture shown in Figure 2, as seen design works in respectively, the push-broom type camera of infrared band.The key technical indexes of this two camera is:
Orbit altitude: 450km
Spectral range: 0.46～1 μ m; 2.7～4.3 μ m
Angular resolution: 1.5m; 6.75m
Visual field: 7.85km
Detector: 6000 yuan of CCD linear array 8 μ m * 8 μ m; 1200 yuan of CCD linear array 30 μ m * 30 μ m
The technical indicator of primary optical system is:
Bore: 200mm
As seen camera focus: 2500mm; Infrared camera focal length: 2000mm
Wavelength: 0.46～1 μ m; 2.7～4.3 μ m
Resolution: 3.2 μ rad; 15 μ rad
Linear field: 1 °
Picture element is optimized: RMS visible and infrared camera is better than 4 μ m and 12 μ m respectively, and MTF is all near diffraction limit.Structural parameters see Table 1.
Table 1
| Parameter | Example 1 |
| The visual field is from imaging shaft | 2.0°/1.0° |
| Principal reflection mirror B2 radius-of-curvature | -2612.94mm (recessed) |
| Principal reflection mirror B2 taper coefficient | -0.366 |
| Principal reflection mirror B2 high-order term coefficient B | 1.88e-12 |
| Principal reflection mirror B2 high-order term coefficient C | -5.82e-19 |
| BDe1 | -150mm |
| BD1 | -969.467mm |
| Secondary mirror B3 radius-of-curvature | -1053.61mm (protruding) |
| Secondary mirror B3 taper coefficient | -36.865 |
| Secondary mirror B3 high-order term coefficient B | -3.9e-9 |
| Secondary mirror B3 high-order term coefficient C | 5.14e-14 |
| BDe2 | -10mm |
| BD2-1/BD2-2 | 1500mm/1500mm |
| Plane mirror BP1/BP2 inclination angle | -45°/-45° |
| BD3-1/BD3-2 | -1528.37mm/-1503.18mm |
| The 3rd catoptron B4-1/B4-2 radius-of-curvature | (1485.25mm/1684.99mm recessed) |
| The 3rd catoptron B4-1/B4-2 taper coefficient | -0.48/-1.08 |
| The high-order term coefficient B of B4-1/B4-2 | -4.62e-12/-2.07e-11 |
| The high-order term coefficient C of B4-1/B4-2 | -4.48e-18/-1.82e-18 |
| BDe4-1/BDe4-2 | 400mm/250mm |
| BD4-1/BD4-2 | 1156.18mm/1425.73mm |
Example 2:
According to optical texture shown in Figure 3, as seen design works in respectively, the scan-type camera of infrared band.The key technical indexes of this camera is:
Orbit altitude: 600km
Spectral range: 0.46～1 μ m; 2.7～4.3 μ m
Angular resolution: 1.1m; 4.5m
Single-element detector: 8 μ m * 8 μ m; 30 μ m * 30 μ m
The technical indicator of primary optical system is:
Bore: 300mm
As seen camera focus: 4500mm; Infrared camera focal length: 4000mm
Wavelength: 0.46～1 μ m; 2.7～4.3 μ m
Resolution: 1.8 μ rad; 7.5 μ rad
Picture element is optimized: RMS visible and infrared camera is better than 5 μ m and 9 μ m respectively, and MTF is all near diffraction limit.Structural parameters see Table 2.
Table 2
| Parameter | Example 3 |
| The visual field is from imaging shaft | 10.0°/12.0° |
| Principal reflection mirror C2 radius-of-curvature | (3871.60mm protruding) |
| Principal reflection mirror C2 taper coefficient | -4.05 |
| Principal reflection mirror C2 high-order term coefficient c | -9.9e-12 |
| Principal reflection mirror C2 high-order term coefficient d | -1.04e-12 |
| CDe1 | 0 |
| CD1 | -1920.73mm |
| Secondary mirror C3 radius-of-curvature | (4931.85mm recessed) |
| Secondary mirror C3 taper coefficient | -0.07 |
| Secondary mirror C3 high-order term coefficient c | 7.39e-12 |
| Secondary mirror C3 high-order term coefficient d | -2.65e-13 |
| CDe2 | -370mm |
| CD2-1/CD2-2 | 5000mm/5000mm |
| Plane mirror CP1/CP2 inclination angle | 30°/30° |
| CD3-1/CD3-2 | -5410mm/-8040mm |
| The 3rd catoptron C4-1/C4-2 radius-of-curvature | (4052.15mm/6679.12mm recessed) |
| The 3rd catoptron C4-1/C4-2 taper coefficient | -1.00/-2.22 |
| The high-order term coefficient c of C4-1/C4-2 | 1.55e-11/-7.34e-11 |
| The high-order term coefficient d of C4-1/C4-2 | -7.13e-13/-6.81e-13 |
| CDe4-1/CDe4-2 | -730mm/-1000mm |
| CD4-1/CD4-2 | 4801.42mm/7288.27mm |
Claims (3)
1. multi-focus multi-visual field shielding-free total reflection astigmation free optical system, it is made of off-axis aspheric surface catoptron and level crossing, it is characterized in that: form one from axle three anti-astigmation free optical systems from axle principal reflection mirror (2) with from the first mirror group (G1) that axle secondary mirror (3) is formed with comprising two or more any one the 3rd catoptron (4-1,4-2,4-3) in the second mirror group (G2) of axle the 3rd catoptron.
2. a kind of multi-focus multi-visual field shielding-free total reflection astigmation free optical system according to claim 1 is characterized in that: the principal reflection mirror (2) in the said first mirror group (G1) and secondary mirror (3) be common systematic optical axis from axle high order aspheric surface catoptron.
3. a kind of multi-focus multi-visual field shielding-free total reflection astigmation free optical system according to claim 1 is characterized in that: each the 3rd catoptron (4-1,4-2,4-3) in the said second mirror group (G2) is from axle high order aspheric surface catoptron.
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| CNA2008100383249A CN101285930A (en) | 2008-05-30 | 2008-05-30 | Multi-focus multi-visual field shielding-free total reflection astigmation free optical system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062936A (en) * | 2010-12-24 | 2011-05-18 | 中国科学院长春光学精密机械与物理研究所 | Off-axis TMA optical system for reducing processing and resetting difficulty |
| CN101697031B (en) * | 2009-10-21 | 2011-06-01 | 北京理工大学 | Wideband, high-resolution and varifocal three-mirror reflective optical system |
| CN104049348A (en) * | 2014-06-26 | 2014-09-17 | 中国科学院长春光学精密机械与物理研究所 | Spherical reflection type coronagraph |
| CN107505694A (en) * | 2017-09-22 | 2017-12-22 | 天津大学 | The method for improving off-axis three reflecting optical systems image quality |
| CN112710390A (en) * | 2020-12-07 | 2021-04-27 | 北京理工大学 | Resolution-adjustable off-axis four-counter-rotation zoom imaging spectrometer |
-
2008
- 2008-05-30 CN CNA2008100383249A patent/CN101285930A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101697031B (en) * | 2009-10-21 | 2011-06-01 | 北京理工大学 | Wideband, high-resolution and varifocal three-mirror reflective optical system |
| CN102062936A (en) * | 2010-12-24 | 2011-05-18 | 中国科学院长春光学精密机械与物理研究所 | Off-axis TMA optical system for reducing processing and resetting difficulty |
| CN102062936B (en) * | 2010-12-24 | 2012-07-25 | 中国科学院长春光学精密机械与物理研究所 | Off-axis TMA optical system for reducing processing and resetting difficulty |
| CN104049348A (en) * | 2014-06-26 | 2014-09-17 | 中国科学院长春光学精密机械与物理研究所 | Spherical reflection type coronagraph |
| CN107505694A (en) * | 2017-09-22 | 2017-12-22 | 天津大学 | The method for improving off-axis three reflecting optical systems image quality |
| CN112710390A (en) * | 2020-12-07 | 2021-04-27 | 北京理工大学 | Resolution-adjustable off-axis four-counter-rotation zoom imaging spectrometer |
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