CN112067126A - Satellite-borne extreme ultraviolet hyperspectral camera optical system for atmospheric exploration - Google Patents
Satellite-borne extreme ultraviolet hyperspectral camera optical system for atmospheric exploration Download PDFInfo
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- G—PHYSICS
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0208—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0243—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows having a through-hole enabling the optical element to fulfil an additional optical function, e.g. a mirror or grating having a throughhole for a light collecting or light injecting optical fiber
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/44—Grating systems; Zone plate systems
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Abstract
The invention belongs to the technical field of ultraviolet hyperspectral cameras, and particularly relates to a satellite-borne extreme ultraviolet hyperspectral camera optical system for atmospheric exploration, which comprises: the device comprises an incidence base (1), a toroidal reflector base (2), a toroidal reflector (3), a spherical grating base (4), a spherical grating (5), a first light barrier (6), a second light barrier (7), a third light barrier (8), an ultraviolet detector (9) and a structural frame (10); the incident base (1) is fixed on the incident hole, and an incident slit (11) is formed in the incident base; a spherical grating base (4) is fixed below the first light barrier (6), and a spherical grating (5) is fixed on the spherical grating base (4); the toroidal reflector (3) is arranged on the toroidal reflector base (2); an ultraviolet detector (9) is fixed below the second light blocking plate (7); a plurality of third light blocking plates (8) are arranged below the spherical grating (5) and the ultraviolet detector (9).
Description
Technical Field
The invention belongs to the technical field of ultraviolet hyperspectral cameras, and particularly relates to a satellite-borne extreme ultraviolet hyperspectral camera optical system for atmospheric exploration.
Background
The air glow and aurora are important natural luminescence phenomena in the space optical radiation background, and are aimed at O air glow and N air glow at the height of ionized layer2Airglow is detected, and the ionospheric electron density and thermal O/N can be obtained by inversion2And the information is obtained, so that the ionosphere and the disturbance condition thereof are monitored and forecasted. The ionosphere is an important area in space weather and is one of the most important areas of human space activities, the time-space change of the ionosphere has important influence on the propagation of radio wave signals of systems such as satellite navigation positioning and ground-space radio communication, and the monitoring and early warning of the state and the change of the ionosphere are important components in space weather services.
The airborne ultraviolet hyperspectral camera is used for detecting the airglow radiation of far ultraviolet wave bands, and is an ideal detection means for researching the ionosphere. In the 70's of the 20 th century, vacuum ultraviolet ionosphere detection began to be carried out internationally on satellites and continued to date. Representative foreign satellite-borne UltraViolet spectrum cameras include GUVI (Global ultra Violet imager) loaded on a solar geostationary orbit satellite TIMED emitted in 2001, an ionosphere joint detection plan ICON developed by UC Birkeley in 2017, and a global scale marginal nadir observer GOLD developed by LASP in 2018.
In an ultraviolet hyperspectral camera, a grating for light splitting is an important optical element. Currently, the types of gratings include: planar gratings, spherical gratings and toroidal gratings. Among them, the toroidal grating is widely used because it helps to eliminate optical aberrations such as astigmatism and coma in an optical system. For a satellite-borne atmosphere detection hyperspectral load, in order to improve the collection capability of target radiation, the object distance of a spectral dimension and a spatial dimension is usually inconsistent to expand the instantaneous field of view of the spectral dimension, so a toroidal grating is usually adopted, for example, an extreme ultraviolet spectral camera carried on an ICON in 2017. However, compared with a plane grating and a spherical grating, the toroidal grating is expensive; and because the toroidal grating needs to be customized and processed, the processing period of the toroidal grating is one time of that of the spherical grating, the processing period is greatly increased, the cost is greatly improved, and the working efficiency is low.
Disclosure of Invention
In order to solve the problems of high cost, high processing difficulty and long processing period of the conventional hyperspectral camera caused by the adoption of the toroidal grating, the invention provides an optical system of a satellite-borne extreme ultraviolet hyperspectral camera for atmosphere exploration, which adopts the combination of a spherical grating and a toroidal reflector to replace the toroidal grating, wherein the price of the spherical grating adopted by the method is far lower than that of the toroidal grating, the cost is greatly reduced, the processing total cost of the toroidal reflector and the spherical grating is far lower than that of the toroidal grating, the processing period is also greatly shortened, and the working efficiency is greatly improved.
The system comprises: the device comprises an incidence base, a toroidal reflector, a spherical grating base, a spherical grating, a first light baffle, a second light baffle, a third light baffle, an ultraviolet detector and a structural frame;
one side of the structural frame is provided with an incident hole, an incident base is fixed on the incident hole, and an incident slit is arranged on the incident base and is opposite to the incident hole; a first light barrier is fixed on the inner wall of one side of the structural frame below the entrance hole; a spherical grating base is fixed on the inner wall below the first light barrier and on one side of the structural frame, and the spherical grating is fixed on the spherical grating base and is positioned in the structural frame;
the toroidal reflector base is fixed on the opposite side of the structural frame opposite to one side of the structural frame, and the toroidal reflector is installed on the toroidal reflector base and is positioned in the structural frame; a second light baffle plate is fixedly arranged on the inner wall below the toroidal reflector and on the opposite side of the structural frame; an ultraviolet detector is fixed on the inner wall of the lower part of the second light baffle plate and the inner wall of the opposite side of the structural frame;
and a plurality of third light blocking plates which are arranged in parallel at equal intervals are arranged below the spherical grating and the ultraviolet detector, wherein the third light blocking plates which are arranged in parallel at equal intervals are arranged at the bottom of the structural frame.
As one improvement of the above technical solution, the first light barrier and the second light barrier are arranged in a staggered manner;
one end of the first light barrier is folded downwards by 90 degrees to form a folding section, the folding section is fixed on the inner wall of one side of the structural frame, and the other end of the first light barrier is perpendicular to the inner wall of one side of the structural frame and extends towards the middle part of the structural frame;
one end of the second light-blocking plate is folded upwards by 120 degrees to form a folding section, the folding section is fixed on the inner wall of the opposite side of the structure frame, and the other end of the second light-blocking plate is perpendicular to the inner wall of one side of the structure frame and extends towards the middle part of the structure frame;
the length of the first light barrier is less than that of the second light barrier.
As an improvement of the above technical solution, the toroidal mirror and the spherical grating are diagonally staggered, and the spherical grating is located obliquely below the toroidal mirror.
As one improvement of the technical scheme, the toroidal reflecting mirror and the spherical grating are both made of quartz glass materials.
As one improvement of the technical scheme, a plane of the toroidal reflector fixed on the base of the toroidal reflector is taken as an X axis, a plane vertical to the plane is taken as a Y axis, and the toroidal reflector deviates 10 mm-13 mm towards the direction far away from the Y axis; the toroidal reflector is inclined 4-6 degrees in the direction far away from the X axis.
As one improvement of the technical scheme, the radius of the toroidal reflector is 269 mm-271 mm, and the rotating radius of the toroidal reflector is 1210 mm-1214 mm; the distance between the toroidal reflectors is 179 mm-181 mm.
As one improvement of the technical scheme, the radius of the spherical grating is 497 mm-500 mm; the distance between the spherical gratings is 157 mm-160 mm; the pair of spherical grating lines is 2.4, and the diffraction order is 1.
As one improvement of the technical scheme, the gap width of the incident slit and the spectral resolution of the ultraviolet hyperspectral camera are in a linear relationship; when the width of the entrance slit is 0.9mm, the camera spectral resolution is less than or equal to 4nm, and when the width of the entrance slit is 0.45mm, the camera spectral resolution is less than or equal to 2 nm.
As one improvement of the technical scheme, the structural frame is made of an aluminum alloy material.
Compared with the prior art, the invention has the beneficial effects that:
1. the optical system adopts the combination of the toroidal reflector and the spherical grating to replace the toroidal grating, greatly reduces the processing cost and shortens the processing period under the condition of the same image quality and the same field range;
2. the optical system of the invention adopts the total reflection optical element of the toroidal reflector and the spherical grating, can plate different types of reflecting films according to the requirements of the optical system, and has the characteristics of high transmittance and wide coverage spectrum compared with the existing transmission optical system;
3. the processing total cost of the toroidal reflector and the spherical grating is far lower than that of the toroidal grating, and the working efficiency is greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of an optical system of a satellite-borne extreme ultraviolet hyperspectral camera for atmospheric exploration, which is disclosed by the invention;
FIG. 2 is an optical path diagram of an optical system of the satellite-borne extreme ultraviolet hyperspectral camera for atmospheric exploration according to the invention in FIG. 1;
FIG. 3 is a point diagram of all fields of view and wavelengths in one embodiment of an optical system of a satellite-borne extreme ultraviolet hyperspectral camera for atmospheric sounding according to the invention.
Names of the attached drawings:
1. incidence base 2, toroidal reflector base
3. Toroidal reflector 4, spherical grating base
5. Spherical grating 6 and first light barrier
7. A second light-blocking plate 8 and a third light-blocking plate
9. Ultraviolet detector 10, structural framework
11. Entrance slit 12, image plane
13. 100nm wavelength diffuse spot 14, 96nm wavelength diffuse spot
15. 84nm wavelength diffuse spot 16, 80nm wavelength diffuse spot
17. 64nm wavelength diffuse spot 18, 60nm wavelength diffuse spot
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
As shown in figures 1 and 2, the invention provides an optical system of a satellite-borne extreme ultraviolet hyperspectral camera for atmospheric exploration, which adopts the combination of a spherical grating and a toroidal reflector to replace the toroidal grating, wherein the spherical grating adopted by the method has the price far lower than that of the toroidal grating, thereby greatly reducing the cost, the total processing cost of the toroidal reflector and the spherical grating is far lower than that of the toroidal grating, the processing period is greatly shortened, and the working efficiency is greatly improved.
The system comprises: the device comprises an incidence base 1, a toroidal reflector base 2, a toroidal reflector 3, a spherical grating base 4, a spherical grating 5, a first light barrier 6, a second light barrier 7, a third light barrier 8, an ultraviolet detector 9 and a structural frame 10;
one side of the structural frame 10 is provided with an incident hole, the incident base 1 is fixed on the incident hole, the incident base is provided with an incident slit 11, and the incident slit 11 is opposite to the incident hole; a first light barrier 6 is fixed on the inner wall of one side of the structural frame 10 below the entrance hole; a spherical grating base 4 is fixed on the inner wall of one side of the structural frame 10 below the first light barrier 6, and a spherical grating 5 is fixed on the spherical grating base 4 and is positioned in the structural frame 10;
the toroidal mirror base 2 is fixed on the opposite side of the structural frame opposite to one side of the structural frame 10, and the toroidal mirror 3 is installed on the toroidal mirror base 2 and is positioned in the structural frame 10; a second light baffle plate 7 is fixedly arranged on the inner wall of the lower part of the toroidal reflector 3 and the opposite side of the structural frame; an ultraviolet detector 9 is fixed on the inner wall of the lower part of the second light baffle plate 7 and the opposite side of the structural frame;
a plurality of third light blocking plates 8 which are arranged in parallel at equal intervals are arranged below the spherical grating 5 and the ultraviolet detector 9, wherein the plurality of third light blocking plates 8 which are arranged in parallel at equal intervals are arranged at the bottom of the structural frame 10.
Wherein, the first light barrier 6 and the second light barrier 7 are arranged in a staggered way;
one end of the first light barrier 6 is folded downwards by 90 degrees to form a folded section, the folded section is fixed on the inner wall of one side of the structural frame 10, and the other end of the first light barrier 6 is perpendicular to the inner wall of one side of the structural frame 10 and extends towards the middle part of the structural frame for blocking light rays incident from the incident hole;
one end of the second light baffle plate 7 is folded upwards by 120 degrees to form a folding section, the folding section is fixed on the inner wall of the opposite side of the structure frame, and the other end of the second light baffle plate 7 is perpendicular to the inner wall of one side of the structure frame 10 and extends towards the middle part of the structure frame for shielding light reflected from the toroidal reflector;
the length of the first light barrier 6 is smaller than the length of the second light barrier 7.
The toroidal reflectors 3 and the spherical gratings 5 are arranged in a diagonal staggered manner, and the spherical gratings 5 are positioned obliquely below the toroidal reflectors 3 to ensure that all light rays reflected by the toroidal reflectors 3 are reflected to the spherical gratings 5;
the toroidal reflector 3 and the spherical grating 5 are both made of quartz glass materials, so that the cost is greatly reduced.
The plane of the toroidal reflector 3 fixed on the toroidal reflector base 4 is taken as an X axis, the plane vertical to the plane is taken as a Y axis, and the toroidal reflector 3 deviates 12.1mm towards the direction far away from the Y axis; the toroidal mirror 3 is tilted 5.081 away from the X-axis.
As shown in fig. 2, the YOZ plane is defined as the meridional plane of the optical system, and the XOZ plane is defined as the sagittal plane of the optical system. The radius of curvature and the radius of rotation of the toroidal mirror are unequal, namely the radius of curvature of the meridian plane is unequal to the radius of curvature of the sagittal plane, so that the light rays of different planes are converged to different degrees after passing through the toroidal mirror. In the system, if the meridian plane curvature radius is larger than the sagittal plane curvature radius, the convergence degree of the sagittal plane light rays is larger, namely the sagittal plane focal length is shorter; on the contrary, if the radius of curvature of the sagittal plane is larger than that of the meridional plane, the convergence degree of the meridional plane light is larger, and the meridional plane focal distance is shorter. According to the designed toroidal grating, the meridian plane curvature radius is smaller than the sagittal plane curvature radius, the meridian plane light convergence degree is larger, and the focal length is shorter. The spherical grating plays the roles of light splitting and light converging.
The film layer on the mirror surface of the toroidal reflector is made of magnesium fluoride and silicon carbide, the material film layer can cover the range from extreme ultraviolet to far ultraviolet, and if the requirement is near ultraviolet, visible light wave band or infrared wave band, the material film layer can be made of aluminum plating or silver plating.
The radius of the toroidal mirror is 270.556mm, and the rotation radius of the toroidal mirror is 1212.884 mm; the pitch of the toroidal mirrors is 180.772 mm.
The width of the gap of the incident slit is adjusted according to the spectral resolution of the ultraviolet hyperspectral camera; when the width of the entrance slit is 0.9mm, the spectral resolution of the camera is less than or equal to 4nm, and when the width of the entrance slit is 0.45mm, the spectral resolution of the camera is less than or equal to 2nm, namely, the width of the entrance slit and the spectral resolution of the camera of the ultraviolet hyperspectral camera are in a linear relationship.
The radius of the spherical grating 5 is 498.1 mm; the distance between the spherical gratings 5 is 158.388 mm; the pair of spherical grating lines is 2.4, and the diffraction order is 1.
The structural frame 10 is made of an aluminum alloy material.
The working process of the satellite-borne ultraviolet hyperspectral camera is as follows:
light rays of each spectral dimension field and each spatial dimension field enter the structural frame 10 from the entrance slit 11 and are incident to the toroidal reflector 3, the light rays reflected by the toroidal reflector 3 are reflected to the spherical grating 5, the meridian plane and the sagittal plane have different convergence degrees at the spherical grating 5, and the light rays split by the spherical grating 5 are reflected to the image plane 12 of the ultraviolet detector for imaging.
In order to improve the image quality, the optical system is continuously optimized, and after optimization, the radius and thickness interval of the toroidal mirror and the spherical grating changes, the specific optimization measure of this embodiment is to apply optical design software to construct an optimization function, and add aberration and structure limiting parameters, so as to gradually obtain the curvature radius, the rotation radius and the distance of the toroidal mirror 3, and the curvature radius, the rotation radius and the distance of the spherical grating.
As shown in FIG. 3, the point diagrams of the optical system at different wave bands are similar to those of other fields. Wherein, the 'points' at different positions represent the diffuse spots with different wavelengths, namely 100nm wavelength diffuse spot 13, 96nm wavelength diffuse spot 14, 84nm wavelength diffuse spot 15, 80nm wavelength diffuse spot 16, 64nm wavelength diffuse spot 17 and 60nm wavelength diffuse spot 18; therefore, the difference between the wavelengths of every two adjacent scattered spots is 4nm, the wavelengths of the point diagrams at the upper end and the lower end cover 60nm-100nm, and the wavelength is the working waveband of the optical system. Different boxes represent different spatial dimensions of the field of view, covering ± 5 °. It can be seen that two diffuse spots with a wavelength difference of 4nm can be clearly separated, which means that the spectral resolution of the optical system is less than or equal to 4nm in each wave band and each field of view. The calibration light path for the spectral dimension limited object distance of the embodiment is evaluated by the diameter of a light spot at an image surface, the diameter of the light spot is directly evaluated by the image quality of an optical system, the diameter of the light spot of the optical system is less than 100um, the spectral dimension field of view is 12 degrees, the spatial dimension field of view is 10 degrees, and the image quality of the optical system is close to that of a toroidal grating, so that the toroidal grating can be completely replaced by the combination of a toroidal reflector and a spherical grating.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. An optical system of a satellite-borne extreme ultraviolet hyperspectral camera for atmospheric exploration, the system comprising: the device comprises an incidence base (1), a toroidal reflector base (2), a toroidal reflector (3), a spherical grating base (4), a spherical grating (5), a first light barrier (6), a second light barrier (7), a third light barrier (8), an ultraviolet detector (9) and a structural frame (10);
one side of the structural frame (10) is provided with an entrance hole, an incident base (1) is fixed on the entrance hole, the incident base (1) is provided with an incident slit (11), and the incident slit (11) is opposite to the entrance hole; a first light barrier (6) is fixed on the inner wall of one side of the structural frame (10) below the entrance hole; a spherical grating base (4) is fixed on the inner wall of one side of the structural frame (10) below the first light barrier (6), and a spherical grating (5) is fixed on the spherical grating base (4) and is positioned in the structural frame (10);
the toroidal reflector base (2) is fixed on the opposite side of the structural frame opposite to one side of the structural frame (10), and the toroidal reflector (3) is installed on the toroidal reflector base (2) and is positioned in the structural frame (10); a second light baffle plate (7) is fixedly arranged on the inner wall of the opposite side of the structural frame below the toroidal reflector (3); an ultraviolet detector (9) is fixed on the inner wall of the lower part of the second light baffle plate (7) and the opposite side of the structural frame;
a plurality of third light blocking plates (8) which are arranged in parallel at equal intervals are arranged below the spherical grating (5) and the ultraviolet detector (9), wherein the third light blocking plates (8) which are arranged in parallel at equal intervals are arranged at the bottom of the structural frame (10).
2. The spaceborne extreme ultraviolet hyperspectral camera optical system for atmosphere exploration according to claim 1, wherein the first light barrier (6) and the second light barrier (7) are arranged in a staggered manner;
one end of the first light barrier (6) is folded downwards by 90 degrees to form a folding section, the folding section is fixed on the inner wall of one side of the structural frame (10), and the other end of the first light barrier (6) is perpendicular to the inner wall of one side of the structural frame (10) and extends towards the middle part of the structural frame;
one end of the second light-blocking plate (7) is folded upwards by 120 degrees to form a folding section, the folding section is fixed on the inner wall of the opposite side of the structural frame, and the other end of the second light-blocking plate (7) is perpendicular to the inner wall of one side of the structural frame (10) and extends towards the middle part of the structural frame;
the length of the first light barrier (6) is less than that of the second light barrier (7).
3. The spaceborne extreme ultraviolet hyperspectral camera optical system for atmosphere exploration according to claim 1, wherein the toroidal mirror (3) and the spherical grating (5) are diagonally staggered, and the spherical grating (5) is positioned obliquely below the toroidal mirror (3).
4. The spaceborne extreme ultraviolet hyperspectral camera optical system for atmosphere exploration according to claim 3, wherein the toroidal mirror (3) and the spherical grating (5) are both made of quartz glass materials.
5. The spaceborne extreme ultraviolet hyperspectral camera optical system for atmosphere exploration according to claim 4, which is characterized in that a plane on which the toroidal mirror (3) is fixed on the toroidal mirror base (4) is taken as an X axis, a plane perpendicular to the plane is taken as a Y axis, and the toroidal mirror (3) deviates from the Y axis by 10mm to 13 mm; the toroidal reflector (3) inclines 4-6 degrees in the direction far away from the X axis.
6. The satellite-borne extreme ultraviolet hyperspectral camera optical system for atmosphere exploration according to claim 5, wherein the radius of the toroidal mirror (3) is 269mm to 271mm, and the rotation radius of the toroidal mirror (3) is 1210mm to 1214 mm; the distance between the toroidal reflectors (3) is 179 mm-181 mm.
7. The satellite-borne extreme ultraviolet hyperspectral camera optical system for atmosphere exploration according to claim 1, wherein the radius of the spherical grating (5) is 497 mm-500 mm; the distance between the spherical gratings (5) is 157 mm-160 mm; the pair of spherical grating lines is 2.4, and the diffraction order is 1.
8. The optical system of the spaceborne extreme ultraviolet hyperspectral camera for atmosphere exploration according to claim 1, wherein the gap width of the entrance slit is in a linear relationship with the spectral resolution of the ultraviolet hyperspectral camera; when the width of the entrance slit is 0.9mm, the camera spectral resolution is less than or equal to 4nm, and when the width of the entrance slit is 0.45mm, the camera spectral resolution is less than or equal to 2 nm.
9. The spaceborne extreme ultraviolet hyperspectral camera optical system for atmospheric sounding as recited in claim 1, wherein the structural frame (10) is made of an aluminum alloy material.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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