CN208937803U - A kind of round-the-clock optical system of star sensor of miniaturization - Google Patents
A kind of round-the-clock optical system of star sensor of miniaturization Download PDFInfo
- Publication number
- CN208937803U CN208937803U CN201821651957.2U CN201821651957U CN208937803U CN 208937803 U CN208937803 U CN 208937803U CN 201821651957 U CN201821651957 U CN 201821651957U CN 208937803 U CN208937803 U CN 208937803U
- Authority
- CN
- China
- Prior art keywords
- reflecting mirror
- optical system
- mirror
- round
- star sensor
- 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.)
- Expired - Fee Related
Links
Abstract
The utility model discloses a kind of round-the-clock optical system of star sensor of miniaturization, it include: the first reflecting mirror, second reflecting mirror and third reflecting mirror and as plane, incident ray passes sequentially through the first reflecting mirror, second reflecting mirror and third reflecting mirror are simultaneously reached as plane, second reflecting mirror is equipped with aperture diaphragm, first reflecting mirror, the vertex centre of sphere of second reflecting mirror and third reflecting mirror is respectively positioned on same straight line, the straight line is known as the optical axis of optical system, first reflecting mirror and third power of mirror are positive, second power of mirror is negative, first reflecting mirror is Mirrors with second order surface, second reflecting mirror and third reflecting mirror are spherical reflector；The utility model uses off-axis three reflecting optical system of astigmatism of visual field biasing, non-stop layer blocks, be conducive to improve fixed star detection energy, and avoid the decline of the spot center Energy distribution due to caused by central obscuration, it can be realized the collection of whole fixed star optical signals in response spectra segment limit, detectivity is strong.
Description
Technical field
The utility model relates to a kind of optical system of star sensor, in particular to a kind of round-the-clock star sensor light of miniaturization
System belongs to optical design techniques field.
Background technique
In known inertial navigation set, measuring instrument of the star sensor as one of measurement accuracy highest, measurement essence
Degree can achieve submicrosecond grade.Since star sensor detects the star aberration that too air position and spectrum-stable are distributed using optical system
Signal, measurement accuracy are not drifted about at any time, provide three stable axis for the long-time high-precision flight of aerospace craft
Attitude angle information output.
On the one hand optical system of star sensor inhibits external stray light, on the one hand by fixed star optical signal with symmetrical size
Suitable light spot shape converges to the detector target surface of star sensor, obtains the high pixel grey scale letter of high s/n ratio, subdivision accuracy
Breath.The performance of optical system of star sensor has the detection accuracy of star sensor, magnitude detectivity and small light etc.
Vital influence.
In recent years, with the development of star sensor airmanship and ground, aviation aircraft technical application demand driving,
Even spacecraft also has urgent demand to independent navigation in endoatmosphere inflight phase, and star sensor technical application is arrived
Realize that Sky Background During Daytime star becomes research hotspot in endoatmosphere.When endoatmosphere carries out star observation, the atmospheric background scattered stray light is serious
Influence the detection of fixed star.As observed altitude is lower, the interference of stray light in visual field is stronger.The photograph of veiling glare arrival detector target surface
Spend square directly proportional to optical system relative aperture, space optical system of star sensor belongs to object lens of large relative aperture optical system
System, can not adapt to the detection environment of Sky Background During Daytime star.Therefore, round-the-clock optical system of star sensor is studied for solving star sensor
Navigation applied to endoatmosphere has very important significance and is worth.
The realization of round-the-clock optical system of star sensor need to comprehensively consider the atmospheric background radiation intensity, spectral coverage distribution and
Stellar spectrum selection etc. is balanced selection design.It is generally desirable to even small opposite using the medium relative aperture of long-focus
The optical system in aperture.Existing optical system of star sensor uses transmission-type or refractive and reflective optical system, hardly possible under long-focus
With correcting chromatic aberration and second order spectrum, it is difficult to meet the requirement of Sky Background During Daytime star, also be not easy to take into account Sky Background During Daytime star and night sees star
Optical electivity cause image quality variation require；Patent CN104090355A describes a kind of round-the-clock optical system of star sensor,
Since relative aperture is big, inhibit the ability of strong background radiation on daytime weaker；The optical system length is longer, and there are in biggish
The heart blocks, and reducing relative aperture will cause the rapid decline of detectivity, and central obscuration causes the central energy of fixed star hot spot
It reduces, is unfavorable for improving subsequent subdivision accuracy；In addition, the optical system uses up to three non-spherical reflectors, manufacture
With adjustment higher cost, it is unfavorable for promoting and applying.
Utility model content
Technical problem to be solved by the utility model is: existing optical system of star sensor is there are biggish central obscuration,
Reducing relative aperture will cause the rapid decline of detectivity, and central obscuration causes what the central energy of fixed star hot spot reduced to ask
Topic.
The solution that the utility model solves its technical problem is: a kind of round-the-clock star sensor optical system of miniaturization
System, comprising: the first reflecting mirror, the second reflecting mirror and third reflecting mirror and as plane, incident ray pass sequentially through the first reflecting mirror,
Second reflecting mirror and third reflecting mirror are simultaneously reached as plane, and second reflecting mirror is equipped with aperture diaphragm, first reflection
The vertex centre of sphere of mirror, the second reflecting mirror and third reflecting mirror is respectively positioned on same straight line, and the straight line is known as the optical system
Optical axis, first reflecting mirror and third power of mirror be positive, and second power of mirror is negative, institute
Stating the first reflecting mirror is Mirrors with second order surface, and second reflecting mirror and third reflecting mirror are spherical reflector, described first
The quadratic surface constant K of reflecting mirror meets: -1.75≤K≤- 1.55.
Further, the angle ω of the incident field angle of the optical axis and meridian direction1Meet: 5 °≤ω1≤10°；
The angle ω of the optical axis and sagitta of arc direction incidence field angle2Meet: -5 °≤ω2≤5°。
Further, the ratio of the first power of mirror φ 1 and focal power φ of optical system meets: 1.15≤φ 1/
φ≤1.45；
The ratio of the second power of mirror φ 2 and focal power φ of the optical system meets: 2/ φ of -3.75≤φ
≤-3.05；
The ratio of third power of mirror φ 3 and the focal power φ of the optical system meet: 1.85≤φ, 3/ φ
≤2.55。
Further, the ratio of the focal length f of the detection entrance pupil bore D and optical system of the optical system meets: 1/
10≤D/f≤1/5。
Further, the focal length 300mm of the optical system, relative aperture 1/7.5.
Further, the chief ray of the optical system is no more than 0.05 ° with the angle as plane.
The beneficial effects of the utility model are: the utility model uses off-axis three reflecting optical of astigmatism of visual field biasing
System, non-stop layer block, and are conducive to improve fixed star detection energy, and avoid the spot center energy due to caused by central obscuration point
Cloth decline, can be realized the collection of whole fixed star optical signals in response spectra segment limit, detectivity is strong.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described.Obviously, described attached drawing is a part of the embodiment of the utility model, rather than complete
Portion's embodiment, those skilled in the art without creative efforts, can also be obtained according to these attached drawings it
His design scheme and attached drawing.
Fig. 1 is the structural schematic diagram of the utility model optical system；
Fig. 2 is the optical transfer function curve graph of the utility model optical system；
Fig. 3 is the encircled energy curve graph of the utility model optical system.
Specific embodiment
It is carried out below with reference to technical effect of the embodiment and attached drawing to the design of the utility model, specific structure and generation
Clear, complete description, to be completely understood by the purpose of this utility model, feature and effect.Obviously, described embodiment
It is a part of the embodiment of the utility model, rather than whole embodiments, it is based on the embodiments of the present invention, the skill of this field
Art personnel other embodiments obtained without creative efforts belong to the model of the utility model protection
It encloses.In addition, all connection relationships being previously mentioned in text, not singly refer to that component directly connects, and referring to can be according to specific implementation feelings
Condition, by adding or reducing connection auxiliary, Lai Zucheng more preferably connection structure.Each technology in the utility model creation is special
Sign, can be with combination of interactions under the premise of not conflicting conflict.
Embodiment 1, referring to Fig.1, the round-the-clock optical system of star sensor of a kind of miniaturization, comprising: the first reflecting mirror 1, the
Two-mirror 2 and third reflecting mirror 3 and as plane 5, incident ray passes sequentially through the first reflecting mirror 1, the second reflecting mirror 2 and third
Reflecting mirror 3 is simultaneously reached as plane 5, and second reflecting mirror 2 is equipped with aperture diaphragm 4, and first reflecting mirror 1, second reflects
The vertex centre of sphere of mirror 2 and third reflecting mirror 3 is respectively positioned on same straight line, and the straight line is known as the optical axis of the optical system, institute
The focal power for stating the first reflecting mirror 1 and third reflecting mirror 3 is positive, and the focal power of second reflecting mirror 2 is negative, and described first
Reflecting mirror 1 is Mirrors with second order surface, and second reflecting mirror 2 and third reflecting mirror 3 are spherical reflector, first reflection
The quadratic surface constant K of mirror 1 meets: -1.75≤K≤- 1.55.
The visual field of the utility model optical system is larger, biggish center can be caused to hide using axis reflector formula optical system
It blocks；It is very big using transmission type optical system correcting chromatic aberration and second order spectrum difficulty, and the system scale of construction is larger；Therefore this is practical new
Type uses the off-axis three reflecting optical systems structural shape of visual field biasing, still maintains three coaxial spies of the reflecting mirror vertex centre of sphere
Property, be conducive to adjustment implementation.In order to reduce the larger caused astigmatism of visual field and the curvature of field, distributed using the focal power of positive negative and positive, light
Door screen is located at the relatively symmetrical structure of the second reflecting mirror 2；Quadratic surface is set by the first reflecting mirror 1 and optimizes control, and system disappears
In addition to astigmatism and the curvature of field, excellent image quality is realized.
In order to allow the utility model optical system that there is practical application value and application easy to spread, by the second reflecting mirror 2
It is spherical surface type with the control of third reflecting mirror 3, processing and manufacturing difficulty reduces；And by 3 vertex of the first reflecting mirror 1 and third reflecting mirror
It is overlapped, carries out processing adjustment in such a way that cobasis is quasi-, reduce adjustment period and adjustment cost.
The utility model uses off-axis three reflecting optical system of astigmatism of visual field biasing, and non-stop layer blocks, is conducive to improve
Fixed star detects energy, and avoids the decline of the spot center Energy distribution due to caused by central obscuration, can be realized response spectral coverage
The collection of whole fixed star optical signals in range, detectivity are strong.
The utility model optical system realizes the optical path of image space telecentricity, improves image illumination uniformity, even more important
Be reduction of the sensibility of detector target surface Yu optical system axial direction position, be vibrated with impact under still ensure that it is higher
Measurement accuracy.
The utility model optical system relative aperture is moderate, advantageously reduces the strong background miscellaneous light interference on daytime in visual field,
And diaphragm for eliminating stray light can be arranged between reflecting mirror folds optical path, effectively inhibit the outer veiling glare of visual field.
As optimization, the angle ω of the incident field angle of the optical axis and meridian direction1Meet: 5 °≤ω1≤10°；
The angle ω of the optical axis and sagitta of arc direction incidence field angle2Meet: -5 °≤ω2≤5°。
As optimization, the ratio of the focal power φ of the focal power φ 1 and optical system of the first reflecting mirror 1 meets: 1.15≤
φ1/φ≤1.45；
The ratio of the focal power φ of the focal power φ 2 and optical system of second reflecting mirror 2 meets: -3.75≤φ 2/
φ≤-3.05；
The ratio of the focal power φ of the focal power φ 3 and optical system of third reflecting mirror 3 meets: 1.85≤φ, 3/ φ
≤2.55。
As optimization, the ratio of the focal length f of the detection entrance pupil bore D and optical system of the optical system meets:
1/10≤D/f≤1/5。
As optimization, the focal length 300mm of the optical system, relative aperture 1/7.5, meridian field range is 5 °~9 °,
Sagitta of arc field range is -3 °~3 °.
The full filed of this optical system averagely passes letter >=0.6@50lp/mm, optical system overall length 170mm, back work distance from
More than 38mm.Detection effective viewing field reaches 4 ° × 6 °, cooperates current typical scientific grade CCD or cmos detector, detection limit star
Etc. reaching 7.5 etc., the probability that 3 stars are detected in visual field reaches 99% or more, and single star measurement accuracy is better than 3.67 ".
The utility model optical system optics overall length (distance that the first reflecting mirror 1 arrives image planes) only 170mm, and the ratio of focal length
Value is 0.57, is compared than transmission type optical system, length substantially shortens, and is conducive to space application.
As optimization, the chief ray of the optical system is no more than 0.05 ° with the angle as plane 5.
With reference to Fig. 2, Fig. 2 is that the utility model is bent by the resulting optical transfer function of optical design software zemax analysis
Line chart, the biography letter of full filed are superior to 0.6@50lp/mm, and image quality is excellent.
Referring to Fig. 3, Fig. 3 is that the utility model passes through the resulting encircled energy curve of optical design software zemax analysis
Figure, the Energy distribution consistency of each visual field is preferable, is better than 80% in 13 μm of energy concentration insides of φ.
The better embodiment of the utility model is illustrated above, but the utility model creation is not limited to
The embodiment, those skilled in the art can also make various etc. without departing from the spirit of the present invention
Same variation or replacement, these equivalent variation or replacement are all included in the scope defined by the claims of the present application.
Claims (6)
1. a kind of round-the-clock optical system of star sensor of miniaturization, comprising: the first reflecting mirror, the second reflecting mirror and third reflecting mirror
With as plane, incident ray passes sequentially through the first reflecting mirror, the second reflecting mirror and third reflecting mirror and reaches as plane, feature
Be: second reflecting mirror is equipped with aperture diaphragm, the vertex of first reflecting mirror, the second reflecting mirror and third reflecting mirror
The centre of sphere is respectively positioned on same straight line, and the straight line is known as the optical axis of the optical system, first reflecting mirror and third reflection
The focal power of mirror is positive, and second power of mirror is negative, and first reflecting mirror is Mirrors with second order surface, institute
It states the second reflecting mirror and third reflecting mirror is spherical reflector, the quadratic surface constant K of first reflecting mirror meets: -1.75
≤K≤-1.55。
2. a kind of round-the-clock optical system of star sensor of miniaturization according to claim 1, it is characterised in that: the optical axis
With the angle ω of the incident field angle of meridian direction1Meet:
5°≤ω1≤10°；
The angle ω of the optical axis and sagitta of arc direction incidence field angle2Meet:
-5°≤ω2≤5°。
3. a kind of round-the-clock optical system of star sensor of miniaturization according to claim 1, it is characterised in that: the first reflection
The ratio of the focal power φ of the focal power φ 1 and optical system of mirror meets: 1/ φ≤1.45 1.15≤φ；
The ratio of the second power of mirror φ 2 and focal power φ of the optical system meets: 2/ φ of -3.75≤φ≤-
3.05；
The ratio of third power of mirror φ 3 and the focal power φ of the optical system meet: 1.85≤φ, 3/ φ≤
2.55。
4. a kind of round-the-clock optical system of star sensor of miniaturization according to claim 1, it is characterised in that: the optics
The ratio of the focal length f of the detection entrance pupil bore D and optical system of system meets: 1/10≤D/f≤1/5.
5. a kind of round-the-clock optical system of star sensor of miniaturization according to claim 1, it is characterised in that: the optics
The focal length 300mm of system, relative aperture 1/7.5.
6. a kind of round-the-clock optical system of star sensor of miniaturization according to claim 1, it is characterised in that: the optics
The chief ray of system is no more than 0.05 ° with the angle as plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821651957.2U CN208937803U (en) | 2018-10-11 | 2018-10-11 | A kind of round-the-clock optical system of star sensor of miniaturization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821651957.2U CN208937803U (en) | 2018-10-11 | 2018-10-11 | A kind of round-the-clock optical system of star sensor of miniaturization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208937803U true CN208937803U (en) | 2019-06-04 |
Family
ID=66724290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821651957.2U Expired - Fee Related CN208937803U (en) | 2018-10-11 | 2018-10-11 | A kind of round-the-clock optical system of star sensor of miniaturization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208937803U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109143558A (en) * | 2018-10-11 | 2019-01-04 | 佛山科学技术学院 | A kind of round-the-clock optical system of star sensor of miniaturization |
| CN112305738A (en) * | 2019-08-01 | 2021-02-02 | 清华大学 | Free-form surface reflection type infrared imaging system |
-
2018
- 2018-10-11 CN CN201821651957.2U patent/CN208937803U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109143558A (en) * | 2018-10-11 | 2019-01-04 | 佛山科学技术学院 | A kind of round-the-clock optical system of star sensor of miniaturization |
| CN109143558B (en) * | 2018-10-11 | 2023-08-08 | 佛山科学技术学院 | Miniaturized all-weather star sensor optical system |
| CN112305738A (en) * | 2019-08-01 | 2021-02-02 | 清华大学 | Free-form surface reflection type infrared imaging system |
| CN112305738B (en) * | 2019-08-01 | 2022-02-08 | 清华大学 | Free-form surface reflection type infrared imaging system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9651763B2 (en) | Co-aperture broadband infrared optical system | |
| CN109143558A (en) | A kind of round-the-clock optical system of star sensor of miniaturization | |
| CN102252756B (en) | Front-mounted optical system of satellite-borne differential absorption spectrometer | |
| CN103345062B (en) | High resolution stereo mapping and reconnaissance integrated camera optical system | |
| CN108152973A (en) | A kind of visible ray and medium-wave infrared Shared aperture complex optics | |
| CN208937803U (en) | A kind of round-the-clock optical system of star sensor of miniaturization | |
| CN110579859A (en) | compact type long-focal-length star sensor telecentric optical system | |
| CN109254384A (en) | A kind of star sensor miniaturized optical system | |
| TW202132847A (en) | Catadioptric optical system | |
| CN104090355A (en) | All-weather star sensor optical system | |
| CN102364372A (en) | Multispectral refraction-reflection type optical system | |
| CN109471252B (en) | Complex optical scene space motion simulation device | |
| CN102590993A (en) | Rectangular large-field distortion-eliminated off-axis three-mirror anastigmat (TMA) optical system | |
| Wang et al. | Optical system design method of near-Earth short-wave infrared star sensor | |
| CN107677264B (en) | Reflective star sensor | |
| CN103852889A (en) | Onboard nacelle optical system for overhead operation | |
| CN103149666A (en) | Broadband spectrum large aperture star sensor optical system | |
| CN209028288U (en) | A kind of starlight refraction optical system of star sensor | |
| CN208937799U (en) | A kind of high precision small optical system of star sensor | |
| CN103207443A (en) | Objective lens system for near-infrared flight vehicle attitude and position measurement | |
| CN203759342U (en) | Diffraction-element-comprising large view field and accurate image space telecentric aerial mapping camera optical system | |
| CN106054381A (en) | Conformal concave infrared optical system with deformable mirror | |
| CN108345095A (en) | A kind of low veiling glare round-the-clock star tracker optical texture of wide cut | |
| CN109060128A (en) | A kind of imaging spectrum system of visible light and short-wave infrared Shared aperture | |
| CN105511060B (en) | The global big visual field moon edge optical image-forming objective lens of face ring shape |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190604 Termination date: 20201011 |