CN110426836A - A kind of Schmidt's Cassegrain telescope system - Google Patents
A kind of Schmidt's Cassegrain telescope system Download PDFInfo
- Publication number
- CN110426836A CN110426836A CN201910611160.2A CN201910611160A CN110426836A CN 110426836 A CN110426836 A CN 110426836A CN 201910611160 A CN201910611160 A CN 201910611160A CN 110426836 A CN110426836 A CN 110426836A
- Authority
- CN
- China
- Prior art keywords
- schmidt
- corrector
- subreflector
- reflection mirror
- principal reflection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 2
- 230000016507 interphase Effects 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 4
- 230000000007 visual effect Effects 0.000 description 10
- 238000013461 design Methods 0.000 description 6
- 230000004075 alteration Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 206010010071 Coma Diseases 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000005331 crown glasses (windows) Substances 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000005308 flint glass Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
- G02B23/06—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors having a focussing action, e.g. parabolic mirror
Landscapes
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Telescopes (AREA)
- Lenses (AREA)
Abstract
The invention discloses a kind of Schmidt's Cassegrain telescope systems, comprising: the first Schmidt corrector, the second Schmidt corrector, principal reflection mirror and subreflector；First Schmidt corrector, the second Schmidt corrector, principal reflection mirror and subreflector common optical axis；First Schmidt corrector is modulated for the transmitting light to signal source；Second Schmidt corrector, for carrying out secondary modulation to modulated transmitting light, to correct the first correcting plate bring color difference；Principal reflection mirror, for the transmitting light of secondary modulation to be converged and reflected；Subreflector is imaged for receiving the reflected light of principal reflection mirror and converging in focal point.The present invention corrects color difference problem existing for common Schmidt's Cassegrain system using double Schmidt corrector structures based on Schmidt's Cassegrain telescope system, realizes that image quality is good, field angle is big, aperture is big and compact-sized imaging system.
Description
Technical field
The invention belongs to optical systems and device design field, look in the distance more particularly, to a kind of Schmidt Cassegrain
Mirror system.
Background technique
The optical system of big visual field large aperture is widely used in the detection system of optical region, and big visual field enables to visit
It surveys device and detects biggish range in the same time, large aperture means that the ratio of focal length and bore is smaller, can effectively be promoted and is
System throughput, improves the brightness of system detection target imaging, reduces the optical system exposure time to reach, lifting system is rung
Answer the effect of rate.But big visual field will cause system edges image quality compared to system centre rapid decrease, large aperture then influences
The entire image quality of system, is especially exaggerated the color difference of system.
Cassegrain reflects the combination that microscope group is main concave mirror and time convex lens, is a kind of telescope design commonly mirror surface combination
Mode.This optical texture is that Laurent Cassegrain proposed in 1672, it can utilize space with limits, so that
System is set to possess longer focal length under relatively short system length；Meanwhile reflecting mirror can effectively avoid the generation of color difference, make
System can obtain outstanding paraxial image quality, but off-axis image quality is influenced and poor by coma, and in big visual field large aperture system
In system, since off-axis range is larger, the field of view edge image quality of system by violent decline, so as to cause system work by
To influence.
Schmidt system is to add Schmidt corrector in common Cassegrain's autocollimator front end and formed
Structure, this structure is relatively common in small-bore telescope in, it is to be invented by Bernhardt Schmidt in 1931
's.This structure can correct the aberration of system, lifting system image quality in the case where not changing system focal length, while can obtain
Bigger aperture is obtained, but the correcting mode introduces additional color difference, and in big visual field large aperture system, the color of this introducing
Difference is by the image quality for the system that substantially reduces.
Summary of the invention
In view of the drawbacks of the prior art, the purpose of the present invention is to provide a kind of Schmidt's Cassegrain telescope system,
Existing Schmidt's Cassegrain telescope system is aimed to solve the problem that during correcting system aberration, due to introducing additional color
Difference, cause system image quality reduce the problem of.
To achieve the above object, the present invention provides a kind of Schmidt's Cassegrain telescope systems, comprising: first apply it is close
Special correcting plate, the second Schmidt corrector, principal reflection mirror and subreflector；First Schmidt corrector, the second Schmidt
Correcting plate, principal reflection mirror and subreflector common optical axis；
First Schmidt corrector is modulated for the transmitting light to signal source；
Second Schmidt corrector, for carrying out secondary modulation to modulated transmitting light, to correct described first
Schmidt corrector bring color difference；
The principal reflection mirror, for the transmitting light of secondary modulation to be converged and reflected；
The subreflector is imaged for receiving the reflected light of principal reflection mirror and converging in focal point.
Further, first Schmidt corrector is plane on one side, and another side is the even that highest number is six times
It is aspherical；Second Schmidt corrector is plane on one side, and another side is the even aspheric surface that highest number is six times.
Further, the face type of even aspheric surface meets following equation:
Wherein, z (r, θ) is the rise of optical surface, and r is the radius of meridian plane section circle, and θ is deflection, A2It is 0, A4、
A6For constant term, c is curvature, and k is circular cone coefficient.
Further, the first Schmidt corrector, the plane of the second Schmidt corrector and even aspheric surface distributing position
It is identical or opposite.
Further, first Schmidt corrector and the second Schmidt corrector are bonded in a manner of glued, or intermediate
It is separated by the connection of air plate.
Further, the first Schmidt corrector, the second Schmidt corrector use refractive index difference within 0.2, Ah
Two kinds of glass materials that shellfish number difference is 15 or more.
Further, the principal reflection mirror and subreflector are spherical mirror.
Contemplated above technical scheme through the invention, compared with prior art, can obtain it is following the utility model has the advantages that
(1) in Schmidt's Cassegrain telescope system of the invention, principal reflection mirror and subreflector constitute basic card
Green's system is filled in, color difference can be eliminated in the case where shortening system overall length and is imaged, first piece of Schmidt corrector being capable of school
Positive reflection mirror bring spherical aberration and coma, second piece of Schmidt corrector are then mutually fitted by using with first piece of Schmidt corrector
The De-dispersion material answered corrects the first correcting plate bring color difference, makes system while realizing big visual field and large aperture, obtains
Higher image quality.
(2) Schmidt's Cassegrain telescope system of the invention uses two panels reflecting mirror, is effectively utilized system sky
Between, system length is shortened, so that entire optical system structure is compact, small volume.
(3) Schmidt's Cassegrain telescope system of the invention, only with four optical elements, compared to it is traditional with
Big visual field large aperture telescopic system based on main coke corrector, low in cost, manufacture is easy.
Detailed description of the invention
Fig. 1 is Schmidt's Cassegrain telescope system construction drawing of the invention；
Wherein, 1 it is the first Schmidt corrector, 2 is the second Schmidt corrector, 3 is principal reflection mirror, 4 is subreflector.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, a kind of Schmidt's Cassegrain telescope system provided in an embodiment of the present invention, comprising: first applies
Close spy's correcting plate 1, the second Schmidt corrector 2, principal reflection mirror 3 and subreflector 4；First Schmidt corrector 1, second apply it is close
4 common optical axis of special correcting plate 2, principal reflection mirror 3 and subreflector；First Schmidt corrector 1, for the transmitting light to signal source into
Row modulation；Second Schmidt corrector 2, for carrying out secondary modulation to modulated transmitting light, to correct the first correcting plate band
The color difference come；Principal reflection mirror 3, for the transmitting light of secondary modulation to be converged and reflected；Subreflector 4, for receiving master
The reflected light of reflecting mirror 3 simultaneously converges imaging in focal point.Wherein, 2 knot of the first Schmidt corrector 1 and the second Schmidt corrector
Structure is identical, and being is on one side plane, and another side is the even aspheric surface that highest number is six times；The face type of even aspheric surface meets
Following equation:
Wherein, z (r, θ) is the rise of optical surface, and r is the radius of meridian plane section circle, and θ is deflection, A2It is 0, A4、
A6For constant term, c is curvature, and k is circular cone coefficient；In practical applications, constant r, A in the pattern of face4、A6, according to the mouth of system
Diameter, focal length, visual field and image quality Demand Design.
It should be noted that in Fig. 1 the first Schmidt corrector 1, the second Schmidt corrector 2 plane and even aspheric
EDS maps position is identical, however, the present invention is not limited thereto, in the present invention, the first Schmidt corrector, second Schmidt corrector
Plane and even aspheric surface distributing position may be reversed.In the present invention, the first Schmidt corrector 1 and the second Schmidt correction
Plate 2 can be bonded in a manner of glued or interphase is connected every air plate.In the present invention, the first Schmidt corrector 1, second
2 material of Schmidt corrector uses refractive index difference within 0.2, two kinds of glass materials that Abbe number difference is 15 or more, such as
Flint glass and crown glass, common material group be BK7/F2, BK7/SF2, both materials introduce color difference it is positive and negative on the contrary,
The diverging of different color light is enabled to be controlled.First Schmidt corrector introduces color difference while modulating light, and
Second Schmidt corrector is same or similar with first correcting plate refraction due to having used, and Abbe number differs greatly another
Kind material, therefore the size of the color difference of introducing can be reduced.Principal reflection mirror 3 and subreflector 4 are designed using spherical mirror, Neng Gouyou
Effect reduces manufacture difficulty and manufacturing cost.
The task of telescopic system is different, also different for the demand of visual field, bore, focal length and service band,
The embodiment of the present invention illustrates Schmidt Cassegrain of the invention and looks in the distance by taking the telescope for space debris detection as an example
The design process of mirror system.
Space junk telescope Basic Design index is as shown in table 1.
Table 1
| Index name | Index parameter |
| Bore | ≥600mm |
| Optical field of view angle | ≥6° |
| Focal length | 1100mm |
| 80% energy concentrates radius | ≤9um |
| Equal set optical port diameter | ≥500mm |
| Service band | 400nm~900nm |
Each position of components parameter is as shown in table 2, and position coordinates system is one-dimensional coordinate system, it is specified that being to the right positive direction, coordinate
Origin is located at first optical surface, i.e. the first of the first Schmidt corrector surface.
Table 2
| Element surface | Coordinate (mm) |
| First correcting plate front surface | 0 |
| First correcting plate front surface | 30 |
| Second correcting plate front surface | 100.822 |
| Second correcting plate rear surface | 130.822 |
| Primary mirror surface | 1886.931 |
| Subreflector surface | 1216.248 |
| Image planes | 1521.248 |
In practical application, each position of components should be determined in conjunction with the requirement of system optics performance.Not due to Schmidt corrector
Focal power is introduced, therefore should determine the radius of curvature of the two panels reflecting mirror of Cassegrain system according to the focal length of system requirements first
And relative position, two panels reflecting mirror should share a centre of sphere initial situation (before carrying out last optimization to system), by
In twice that the size of radius of curvature numerical value is focal length, therefore determine that focal length can calculate the size of each mirror curvature radius.System
The relationship of each reflecting mirror focal length and total focal length under initial situation of uniting isWherein f is system focal length, f1、f2
The respectively focal length of principal reflection mirror and subreflector, d is the axial distance of two reflecting mirrors, along with two reflecting mirror of system is total to the centre of sphere
Initial configuration relationship, each reflecting mirror focal length can be solved, so that it is determined that radius of curvature；Then according to the balance of cost and performance
Select suitable Schmidt corrector material, according to level of processing select Schmidt corrector thickness (thinner performance it is better but
The level of processing of demand also increases accordingly), according to the field angle of system requirements, the initial configuration of Cassegrain system and system
F-number determines the parameters of Schmidt corrector face type and the relative position of it and Cassegrain system；Finally obtained to above-mentioned
To initial configuration optimize to obtain a preferable design result.
Each component side shape parameter is as shown in table 3,
Table 3
In table 3, four term coefficient A of the first correcting plate rear surface4For 1.36395E-10, six term coefficient A6For
6.26701E-17；Four term coefficient A of the second correcting plate rear surface4For -6.23310E-11, six term coefficient A6For-
2.72993E-17。
Telescopic system progress imaging performance analysis to above-mentioned design, each visual field speckle RMS radius and angular radius,
80% encircled energy radius and angular radius are as shown in table 4,
Table 4
The corresponding 80% encircled energy diffraction limit radius of the system is 4.002um, from table 4, it can be seen that the system
80% encircled energy radius of full filed is respectively 4.661um/0 °, 4.505um/1 °, 4.052um/2 °, 5.127um/3 °,
Radius corresponding with diffraction limit is suitable, therefore can consider that the system can be imaged close to diffraction limit.Meanwhile in common
In small-bore telescope, angular radius is less than 1 " it is considered that image quality meets primary demand, it can be considered that the system possess it is good
Good image quality.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (7)
1. a kind of Schmidt's Cassegrain telescope system characterized by comprising the first Schmidt corrector (1), second are applied
Close spy's correcting plate (2), principal reflection mirror (3) and subreflector (4)；First Schmidt corrector (1), the second Schmidt correction
Plate (2), principal reflection mirror (3) and subreflector (4) common optical axis；
First Schmidt corrector (1), is modulated for the transmitting light to signal source；
Second Schmidt corrector (2) is applied for carrying out secondary modulation to modulated transmitting light with correcting described first
Close spy's correcting plate bring color difference；
The principal reflection mirror (3), for the transmitting light of secondary modulation to be converged and reflected；
The subreflector (4) is imaged for receiving the reflected light of principal reflection mirror (3) and converging in focal point.
2. a kind of Schmidt's Cassegrain telescope system according to claim 1, which is characterized in that first Schmidt
Correcting plate (1) is on one side plane, and another side is the even aspheric surface that highest number is six times；Second Schmidt corrector
It (2) is on one side plane, another side is the even aspheric surface that highest number is six times.
3. a kind of Schmidt's Cassegrain telescope system according to claim 2, which is characterized in that the even aspheric surface
Face type meet following equation:
Wherein, z (r, θ) is the rise of optical surface, and r is the radius of meridian plane section circle, and θ is deflection, A2It is 0, A4、A6For
Constant term, c are curvature, and k is circular cone coefficient.
4. a kind of Schmidt's Cassegrain telescope system according to claim 2, which is characterized in that first Schmidt
Correcting plate (1), the plane of the second Schmidt corrector (2) and even aspheric surface distributing position are identical or opposite.
5. a kind of Schmidt's Cassegrain telescope system according to claim 4, which is characterized in that first Schmidt
Correcting plate (1) and the second Schmidt corrector (2) are bonded in a manner of glued or interphase is connected every air plate.
6. a kind of Schmidt's Cassegrain telescope system according to claim 5, which is characterized in that first Schmidt
Correcting plate (1) and the second Schmidt corrector (2) are chosen within refractive index difference 0.2, two kinds of glass of 15 or more Abbe number difference
Glass material.
7. any one of -6 a kind of Schmidt's Cassegrain telescope system according to claim 1, which is characterized in that the master
Reflecting mirror (3) and subreflector (4) are spherical mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910611160.2A CN110426836A (en) | 2019-07-08 | 2019-07-08 | A kind of Schmidt's Cassegrain telescope system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910611160.2A CN110426836A (en) | 2019-07-08 | 2019-07-08 | A kind of Schmidt's Cassegrain telescope system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110426836A true CN110426836A (en) | 2019-11-08 |
Family
ID=68409049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910611160.2A Pending CN110426836A (en) | 2019-07-08 | 2019-07-08 | A kind of Schmidt's Cassegrain telescope system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110426836A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111812835A (en) * | 2020-06-28 | 2020-10-23 | 中国科学院紫金山天文台 | Image field corrector for large-field Schmidt sky-patrolling telescope |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003167196A (en) * | 2001-12-04 | 2003-06-13 | Nikon Corp | Cata-dioptric system |
| CN103308161A (en) * | 2013-06-28 | 2013-09-18 | 中国科学院长春光学精密机械与物理研究所 | Space remote sensing large-relative-hole-diameter wide-field high-resolution imaging spectrometer optical system |
| CN204611663U (en) * | 2015-03-12 | 2015-09-02 | 上海小糸车灯有限公司 | A kind of can the LED light source car light multiple layer combination lens of color difference eliminating |
| CN105784681A (en) * | 2016-04-15 | 2016-07-20 | 中国科学院上海技术物理研究所 | Multifunctional system for LIBS spectrum detection and microimaging |
| CN205608177U (en) * | 2016-05-11 | 2016-09-28 | 南京信息工程大学 | Novel coaxial receiving and dispatching system of optics |
| CN106019598A (en) * | 2016-07-30 | 2016-10-12 | 深圳市盈鹏光电有限公司 | Device for eliminating VR dispersion and distortion |
| CN108594420A (en) * | 2018-07-03 | 2018-09-28 | 西安航光仪器厂 | A kind of refraction-reflection type astronomical telescope and telescopic system |
-
2019
- 2019-07-08 CN CN201910611160.2A patent/CN110426836A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003167196A (en) * | 2001-12-04 | 2003-06-13 | Nikon Corp | Cata-dioptric system |
| CN103308161A (en) * | 2013-06-28 | 2013-09-18 | 中国科学院长春光学精密机械与物理研究所 | Space remote sensing large-relative-hole-diameter wide-field high-resolution imaging spectrometer optical system |
| CN204611663U (en) * | 2015-03-12 | 2015-09-02 | 上海小糸车灯有限公司 | A kind of can the LED light source car light multiple layer combination lens of color difference eliminating |
| CN105784681A (en) * | 2016-04-15 | 2016-07-20 | 中国科学院上海技术物理研究所 | Multifunctional system for LIBS spectrum detection and microimaging |
| CN205608177U (en) * | 2016-05-11 | 2016-09-28 | 南京信息工程大学 | Novel coaxial receiving and dispatching system of optics |
| CN106019598A (en) * | 2016-07-30 | 2016-10-12 | 深圳市盈鹏光电有限公司 | Device for eliminating VR dispersion and distortion |
| CN108594420A (en) * | 2018-07-03 | 2018-09-28 | 西安航光仪器厂 | A kind of refraction-reflection type astronomical telescope and telescopic system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111812835A (en) * | 2020-06-28 | 2020-10-23 | 中国科学院紫金山天文台 | Image field corrector for large-field Schmidt sky-patrolling telescope |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104834076B (en) | Small-f-theta-distortion and high-resolution optical system | |
| CN108318995B (en) | Lens system and lens | |
| CN112099205B (en) | Wide-angle lens | |
| CN103969800B (en) | Long-focus type panoramic annular imaging lens | |
| JP2007279632A (en) | Super wide angle lens | |
| CN110646919B (en) | Fisheye lens | |
| CN204044421U (en) | A kind of focal length type Panoramic annular imaging camera lens | |
| CN103777314A (en) | Wide-angle projection lens | |
| CN110824669B (en) | 8K high-resolution panoramic annular optical lens | |
| WO2021036393A1 (en) | 4k high resolution panoramic annular optical system | |
| WO2022227541A1 (en) | Optical lens group and head-mounted display device | |
| CN110596870A (en) | Compact visible-infrared dual-waveband optical system | |
| CN110794556A (en) | Wide-angle lens and panoramic camera system | |
| CN113311573B (en) | Comprises an aspheric catadioptric panoramic imaging optical system | |
| CN110426836A (en) | A kind of Schmidt's Cassegrain telescope system | |
| CN112120650A (en) | Ultra-wide angle steering endoscope head | |
| CN111983788A (en) | Wide-angle lens | |
| CN113009679A (en) | Panoramic imaging optical system | |
| CN106908934A (en) | A kind of ultra-thin camera lens of periscopic long-focus | |
| CN114924457B (en) | Ultra-short-focus optical system and projection equipment | |
| CN109828372A (en) | A kind of Conformal Optical System and its design method based on cylindrical mirror | |
| CN214549341U (en) | Ultra-wide angle steering endoscope head | |
| CN213780517U (en) | Optical imaging lens | |
| CN112649949B (en) | Simple fisheye lens comprising an aspherical lens | |
| CN108363190A (en) | A kind of lens system and camera lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191108 |