CN109656080A - A kind of noctilucence Satellite Camera abnormity hood - Google Patents
A kind of noctilucence Satellite Camera abnormity hood Download PDFInfo
- Publication number
- CN109656080A CN109656080A CN201910156515.3A CN201910156515A CN109656080A CN 109656080 A CN109656080 A CN 109656080A CN 201910156515 A CN201910156515 A CN 201910156515A CN 109656080 A CN109656080 A CN 109656080A
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- cover
- hood
- noctilucence
- satellite
- camera
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B11/00—Filters or other obturators specially adapted for photographic purposes
- G03B11/04—Hoods or caps for eliminating unwanted light from lenses, viewfinders or focusing aids
- G03B11/045—Lens hoods or shields
Abstract
A kind of noctilucence Satellite Camera abnormity hood belongs to space optics technical field, it is therefore intended that proposes a kind of noctilucence Satellite Camera abnormity hood, solves the problems, such as that the veiling glare ability of the existing technology that disappears mutually is restricted with length and weight.A kind of noctilucence Satellite Camera abnormity hood of the invention includes cone cylinder shape cover and the multiple baffle vanes for being co-axially located at cover inner wall；The cover and baffle vane are integrally provided with cut surface from cover large scale end to side wall, and the cut surface and cover axis direction angle are less than the angle of solar vector and cover axis direction.The present invention is achieved that with level-one hood evades sun veiling glare, and compared to traditional window cover, special-shaped hood of the invention has the advantages that length is short, small in size and light-weight.Special-shaped hood of the invention uses the design method of inclined cut, and there is better sun veiling glare to evade effect.To inhibit influence of the sunlight to noctilucence camera imaging on source.
Description
Technical field
The invention belongs to space optics technical field, the one kind being related to can evade sunlight, be imaged for high latitude area
Noctilucence Satellite Camera special-shaped hood.
Background technique
Noctilucence remote sensing is that remote sensing fields develop an active branch, its available night, it is cloudless under the conditions of earth's surface send out
The visible optical information penetrated, and these information are largely generated by earth's surface mankind's activity.For example, urban lighting, naval vessel light and oil
Well burning shines related with mankind's activity；Marine organisms, forest prairie fire and the volcano eruption etc. of nature are also night simultaneously
A part of radiant.
Currently, the sensor imaging time of most of visual remote sensing satellites is daytime, only few satellites have and catch
Catch the ability of earth's surface night visible light.The satellite and international space station of the states such as the U.S., Argentina, Israel can obtain noctilucence
Remote sensing image, and Luo Ka 1 that China emitted in 2018 is then the professional noctilucence remote sensing satellite in first of the whole world.It is distant compared to common
Feel the image on daytime of satellite shooting, noctilucence remote sensing more can directly reflect the information of mankind's activity, while have high-spatial and temporal resolution
The characteristics of, therefore it is widely used in domain of the social sciences.It can be said that common remote sensing is primarily used to the observation earth
With the variation of nature, and noctilucence remote sensing is the observation carried out centered on the mankind.
When the Visible Light Camera operation on orbit of space, the received radiation energy of camera include from target reflection/emitted energy,
The radiation energy of the reflection of atmosphere/scattering energy and the sun, for the dark weak signal target under noctilucence, if the veiling glare energy that disappears of camera
Power is insufficient, then when solar radiation partially can enter optical imaging system, what camera received is clutter reflections radiation and too
Positive direct solar radiation two parts, although solar radiation will not be through that can pass through on optical system imaging to detector in transmission process
Greater loss, but since solar radiation is stronger, part energy is still had by the reflection of optically and mechanically element, scattering etc.
Effect reaches detector surface, and when long-time integration can cause the biggish response of detector, therefore easily lead to echo signal
It is flooded or even fully saturated by background signal.
When non-sun of the satellite to high latitude area is imaged according to dark weak signal target, since the angle of camera optical axis and sunlight exists
Certain moment are acute angles, and sunlight enters optical system through the scattering of hood, and traditional hood is set using cylinder-like structure
Meter, when sunlight and camera optical axis angle are acute angle, sunlight enters from hood lower part, and repeatedly anti-through hood inner wall
It is incident upon detector, to avoid this problem as far as possible, traditional hood reduces sunlight entrance by the way of extension length
Caused by influence, lengthen hood so that length and weight is become larger, be difficult the PST of camera system being reduced to 1E-10 magnitude, at this time
Noctilucence image will be influenced by sun scattered stray light；There is disappear veiling glare ability and hood in traditional hood design method
The problem of length and weight mutually restrict preferably cannot stop sunlight to enter optical system.
Summary of the invention
It is an object of the invention to propose a kind of noctilucence Satellite Camera abnormity hood, solve it is of the existing technology disappear it is miscellaneous
The problem of light ability and length and weight mutually restrict, sun veiling glare is evaded when realizing high latitude area imaging, stops the sun
Light enters optical system, preferably solves the problems, such as that noctilucence camera disappears veiling glare.
A kind of noctilucence Satellite Camera abnormity hood of the invention includes cone cylinder shape cover and is co-axially located in cover
Multiple baffle vanes of wall；The cover and baffle vane are integrally provided with cut surface, the cutting from cover large scale end to side wall
Face and cover axis direction angle are less than the angle of solar vector and cover axis direction.
The angle of plane and satellite flight direction where the cut surface most short side and cover axis is 22 degree.
The cut surface and cover axis direction angle are less than or equal to 38 degree.
Delustring paint is coated on the cover inner and outer wall and baffle vane.
The absorptivity of the delustring paint is more than or equal to 97%.
The invention has the benefit that hood of the invention is used for No. 1 noctilucence camera of Luo Ka, to stop sunlight to enter
Optical system need to be blocked Baffle design too at the oblique hood by cutting using long side to the occlusion effect of sunlight
Sunlight direct irradiation enters inside hood.During the present invention considers in-orbit execution task, the angle of solar vector and camera optical axis
Spend variation range, camera optical axis, that is, cover axis direction, it should which the cut surface of the guarantee oblique hood of camera and optical axis press from both sides as far as possible
Angle of the angle less than solar vector and camera optical axis during general in-orbit task.On the one hand camera hood is used to straight to the sun
It penetrates radiation to be blocked, while also effectively visual field external stray radiation should be inhibited, play the veiling glare that disappears of conventional hood
Effect.
The present invention is applied to noctilucence remote sensing camera, is only achieved that with level-one hood and is evaded to sun veiling glare, compared
In traditional window cover, special-shaped hood of the invention has the advantages that length is short, small in size and light-weight.Abnormity of the invention hides
Light shield uses the design method of inclined cut, when noctilucence camera carries out imaging task to high latitude area, the length of oblique hood
Side face sun incident light, and short side deviates from sunlight, when sunlight is with acute angle incidence, since incident angle is all larger than shading
Cover cutting inclination angle, light can go out to cannot be introduced into inside hood from short side direct projection, therefore this hood has the better sun
Veiling glare evades effect.To inhibit influence of the sunlight to noctilucence camera imaging on source.
Detailed description of the invention
Fig. 1 is a kind of noctilucence Satellite Camera abnormity hood overall structure stereogram one of the invention；
Fig. 2 is a kind of noctilucence Satellite Camera abnormity hood overall structure stereogram two of the invention；
Fig. 3 is a kind of noctilucence Satellite Camera abnormity hood cross-sectional view of the invention；
Fig. 4 is a kind of noctilucence Satellite Camera abnormity hood scheme of installation on camera of the invention；
Fig. 5 is that a kind of noctilucence Satellite Camera abnormity hood of the invention shuts out the light schematic diagram；
Satellite where Fig. 6 is of the invention a kind of noctilucence Satellite Camera abnormity hood and camera is imaged in high latitude area
When 3 dimensional drawing；
Wherein: 1, cover, 101, cut surface, 2, baffle vane, 3, noctilucence camera, 4, satellite.
Specific embodiment
Embodiments of the present invention are described further with reference to the accompanying drawing.
Referring to attached drawing 1- attached drawing 3, the camera special-shaped hood of a kind of noctilucence satellite 4 of the invention include cone cylinder shape cover 1 with
And it is co-axially located at multiple baffle vanes 2 of 1 inner wall of cover；The cover 1 and baffle vane 2 are whole from 1 large scale end of cover to side
Wall is provided with cut surface 101, and the cut surface 101 and 1 axis direction angle of cover are less than 1 axis direction of solar vector and cover
Angle.This hood inner wall is provided with baffle vane 2, to block and weaken the outer veiling glare of visual field and celestial body surface scattering is miscellaneous
Light.
The angle of 4 heading of plane and satellite where the most short side of cut surface 101 and 1 axis of cover is 22 degree.
The cut surface 101 and 1 axis direction angle of cover are less than or equal to 38 degree.
Delustring paint is coated on 1 inner and outer wall of cover and baffle vane 2.
The absorptivity of the delustring paint is more than or equal to 97%.To improve the veiling glare effect that disappears of hood.
Referring to attached drawing 4, hood of the invention is applied on noctilucence camera 3, the axis of cover 1 and the light of noctilucence camera 3
Overlapping of axles.
The optical axis included angle of special-shaped hood cut surface 101 and camera, that is, determine the cutting angle of oblique hood, in order to guarantee
Noctilucence camera 3 is not influenced in imaging session by solar radiation, needs to shield and sunlight of the camera optical axis angle less than 90 °
Line, referring to attached drawing 5, the sunray of different angle is incident on hood long side, the cut surface 101 and camera light of special-shaped hood
Axle clamp angle r should be less than the minimum value α of sunray Yu camera optical axis angle αmin, sunray and camera optical axis angle α are greater than different
The cut surface 101 of shape hood and being blocked for camera optical axis angle r, what is be less than is not blocked then.
According to the actual situation, 4 side-sway ability of satellite is available in difference by STK software emulation between ± 30 °
Under task posture, solar vector and camera optical axis variable angle situation in the area Yang Zhao.It is different in the case where stressing Northern Hemisphere imaging contexts
The section and camera optical axis angle r of shape hood should be less than solar vector and camera optical axis angle minimum value is 38.414 °.
The angle of the plane that most short side is constituted with optical axis on the cut surface 101 of special-shaped hood of the invention and+X-axis is
22 °, the cutting angle of hood should be less than 38.414 ° of minimum angle of solar vector and camera optical axis, be cut according to 38 °
It cuts.Stop sunlight to enter hood when can be achieved that high latitude area noctilucence is imaged, and then sunlight is stopped to enter optical system
System reaches detector and impacts to imaging.
Coordinate referring to attached drawing 6, when setting camera is in-orbit are as follows:
+ X-axis: heading；
+ Y-axis: it can be determined according to the right-hand rule；
+ Z axis: camera optical axis direction；
Arrow between X-axis and Z axis is oriented to solar vector；
According to the actual situation, satellite 4 is when entering the area Yang Zhao from ground shadow zone, solar vector appear in 4 this system of satellite+
In X-Y+Z quadrant, the angle in solar vector and No. 1 track camera face of Luo Ka is the angle with+X-axis in 1 year, is occurred at any time
Variation, variation range are 17 °~27 °, therefore the longest edge of special-shaped hood is in-X+Y-Z the quadrant of 4 this system of satellite,
Angle average value with+X-axis is 22 ° i.e. (17+27) ÷ 2.
Claims (5)
1. a kind of camera special-shaped hood of noctilucence satellite (4), which is characterized in that including cone cylinder shape cover (1) and coaxial arrangement
In multiple baffle vanes (2) of cover (1) inner wall；The cover (1) and baffle vane (2) are whole from cover (1) large scale end to side
Wall is provided with cut surface (101), and the cut surface (101) and cover (1) axis direction angle are less than solar vector and cover (1)
The angle of axis direction.
2. a kind of camera special-shaped hood of noctilucence satellite (4) according to claim 1, which is characterized in that the cut surface
(101) most short side and the angle of plane and satellite (4) heading where cover (1) axis are 22 degree.
3. a kind of camera special-shaped hood of noctilucence satellite (4) according to claim 1 or 2, which is characterized in that the cutting
Face (101) and cover (1) axis direction angle are less than or equal to 38 degree.
4. a kind of camera special-shaped hood of noctilucence satellite (4) according to claim 1, which is characterized in that the cover (1)
Delustring paint is coated on inner and outer wall and baffle vane (2).
5. a kind of camera special-shaped hood of noctilucence satellite (4) according to claim 4, which is characterized in that the delustring paint
Absorptivity be more than or equal to 97%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910156515.3A CN109656080A (en) | 2019-03-01 | 2019-03-01 | A kind of noctilucence Satellite Camera abnormity hood |
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|---|---|---|---|
| CN201910156515.3A CN109656080A (en) | 2019-03-01 | 2019-03-01 | A kind of noctilucence Satellite Camera abnormity hood |
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| CN109656080A true CN109656080A (en) | 2019-04-19 |
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| CN201910156515.3A Pending CN109656080A (en) | 2019-03-01 | 2019-03-01 | A kind of noctilucence Satellite Camera abnormity hood |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111929967A (en) * | 2020-08-12 | 2020-11-13 | 中国科学院光电技术研究所 | Light shield system with high stray light rejection ratio and design method thereof |
| CN112068383A (en) * | 2020-09-18 | 2020-12-11 | 长光卫星技术有限公司 | Stray light eliminating assembly suitable for off-axis three-reflection wide-width remote sensing camera |
| CN112817196A (en) * | 2021-02-04 | 2021-05-18 | 上海卫星工程研究所 | Large-scale high rigidity lens hood of accomodating that can expand |
| CN113009748A (en) * | 2021-03-31 | 2021-06-22 | 长光卫星技术有限公司 | Automatic stray light suppression system of asteroid detection camera |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111929967A (en) * | 2020-08-12 | 2020-11-13 | 中国科学院光电技术研究所 | Light shield system with high stray light rejection ratio and design method thereof |
| CN111929967B (en) * | 2020-08-12 | 2021-09-17 | 中国科学院光电技术研究所 | Light shield system with high stray light rejection ratio and design method thereof |
| CN112068383A (en) * | 2020-09-18 | 2020-12-11 | 长光卫星技术有限公司 | Stray light eliminating assembly suitable for off-axis three-reflection wide-width remote sensing camera |
| CN112817196A (en) * | 2021-02-04 | 2021-05-18 | 上海卫星工程研究所 | Large-scale high rigidity lens hood of accomodating that can expand |
| CN112817196B (en) * | 2021-02-04 | 2022-02-08 | 上海卫星工程研究所 | Large-scale high rigidity lens hood of accomodating that can expand |
| CN113009748A (en) * | 2021-03-31 | 2021-06-22 | 长光卫星技术有限公司 | Automatic stray light suppression system of asteroid detection camera |
| CN113009748B (en) * | 2021-03-31 | 2022-06-28 | 长光卫星技术股份有限公司 | Automatic parasitic light suppression system of asteroid detection camera |
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Application publication date: 20190419 |