CN111721503B - Vacuum ultraviolet band spectrum calibration device and method for satellite-borne hyperspectral remote sensing camera - Google Patents
Vacuum ultraviolet band spectrum calibration device and method for satellite-borne hyperspectral remote sensing camera Download PDFInfo
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- CN111721503B CN111721503B CN202010511608.6A CN202010511608A CN111721503B CN 111721503 B CN111721503 B CN 111721503B CN 202010511608 A CN202010511608 A CN 202010511608A CN 111721503 B CN111721503 B CN 111721503B
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- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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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
- G01J3/28—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
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
- G01J2003/2826—Multispectral imaging, e.g. filter imaging
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Abstract
The invention belongs to the technical field of calibration of a radiation light path, and particularly relates to a vacuum ultraviolet band spectrum calibration device of a satellite-borne hyperspectral remote sensing camera, which comprises: the device comprises a convex spherical reflector (1), a toroidal reflector (2), a vacuum electric two-dimensional translation mechanism (3), an operating platform (12), a to-be-detected satellite-borne hyperspectral remote sensing camera (5), a vacuum tank (9), a vacuum ultraviolet monochromator (10) and a light source (11); the convex spherical reflector (1) and the toroidal reflector (2) are placed on an operating platform (12) through respective mirror frames and are placed in a staggered mode, the convex spherical reflector (1) is installed on a vacuum electric two-dimensional translation mechanism (3) located on the operating platform (12) through a connecting tool (8), and a to-be-measured satellite-borne hyperspectral remote sensing camera (5) is placed on the operating platform (12); the vacuum ultraviolet monochromator (10) is horizontally arranged outside the vacuum tank (9); a light source (11) is arranged on the vacuum ultraviolet monochromator (10).
Description
Technical Field
The invention belongs to the technical field of radiation light path calibration and spectral imagers, and particularly relates to a vacuum ultraviolet band spectrum calibration device and a calibration method of a satellite-borne hyperspectral remote sensing camera.
Background
The airborne hyperspectral remote sensing camera is used for detecting the airglow radiation of the vacuum ultraviolet band, and is an ideal detection means for researching the ionosphere and the hot layer. The realization of the high-precision level detection of the optical remote sensing camera not only depends on the performance of the camera, but also depends on the quantitative inversion level of detection data, namely the level of the content of target gas is inverted through an original data product, and ground calibration is one of indispensable technologies in the quantitative inversion process of the detection data.
Compared with visible light and infrared wave bands, the vacuum ultraviolet wave band lacks a stable surface source radiation source, the test needs to be carried out in a vacuum environment, available materials and a test space are limited, and therefore the calibration difficulty of the wave band is large. At present, in the aspect of ground calibration of a vacuum ultraviolet band spectrum of a satellite-borne hyperspectral remote sensing camera, a deuterium lamp light source and a vacuum ultraviolet monochromator are generally adopted to provide monochromatic light with specific wavelength, and the light source enters a load to be measured directly or through a diffuse reflection plate through a collimation system after being split by the monochromator to finish calibration. Typical vacuum ultraviolet instruments include SSUSI/SSULI vacuum ultraviolet spectrometers with the working waveband of 120-190nm on DMSP satellites, GUVI vacuum ultraviolet spectrometers on TIMED satellites, and SI vacuum ultraviolet imaging spectrometers on IMAGE satellites. The vacuum ultraviolet band spectrum calibration device of the similar foreign instruments comprises: deuterium lamp (xenon lamp) light source, vacuum ultraviolet monochromator, collimating system, turntable and vacuum chamber. The light source is split by the vacuum ultraviolet monochromator and enters the load to be measured directly or through the diffuse reflection plate through the collimation system, and calibration is completed.
With the increasing requirements and demands for vacuum ultraviolet airglow detection, various novel vacuum ultraviolet spectrometers appear, such as a vacuum ultraviolet spectrometer with a working waveband of 60-100nm on an ICON satellite, wherein the vacuum ultraviolet spectrometer has a limited spectral dimension object distance, but has an infinite spatial dimension object distance, and a common vacuum calibration device can only meet calibration under the condition that the spectral dimension and the spatial dimension object distance are equal, but cannot realize calibration under the condition that the spectral dimension and the spatial dimension object distance are not equal.
In addition, in the ultraviolet visible wave band, calibration can be carried out in the atmospheric environment, and space limitation is little when measurement is carried out. However, for vacuum ultraviolet load, due to the fact that space in a vacuum cabin is limited, when a satellite-borne hyperspectral remote sensing camera carries out full-view-field test, the rotation space is limited, the measurement accuracy of an edge view field is reduced, and the like.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a vacuum ultraviolet band spectrum calibration device of a satellite-borne hyperspectral remote sensing camera, which solves the problems that the existing vacuum ultraviolet calibration is limited by a calibration light source and different space dimension object distances cannot be adjusted, and simultaneously solves the problem that the satellite-borne hyperspectral remote sensing camera is limited by space during large-field test, and can reshape collimated light beams into converged cylindrical light beams and realize self-scanning of a field of view. The light path can meet the requirement of the satellite-borne hyperspectral remote sensing camera on the object distances of different space dimensions, and high-precision calibration of the camera under a large view field is realized.
The scaling device comprises: the device comprises a convex spherical reflector, a toroidal reflector, a vacuum electric two-dimensional translation mechanism, an operation platform, a to-be-detected satellite-borne hyperspectral remote sensing camera, a vacuum tank, a vacuum ultraviolet monochromator and a light source;
the convex spherical reflector, the toroidal reflector, the vacuum electric two-dimensional translation mechanism, the operating platform and the to-be-detected satellite-borne hyperspectral remote sensing camera are all arranged in the vacuum tank;
the convex spherical reflector and the toroidal reflector are placed on the operating platform through respective mirror frames and mirror frames, the convex spherical reflector and the toroidal reflector are placed in a staggered mode, and the toroidal reflector inclines towards the outside of the vacuum tank; the convex spherical reflector is installed on a vacuum electric two-dimensional translation mechanism on an operation platform through a connecting tool, and the to-be-measured satellite-borne hyperspectral remote sensing camera is placed on the operation platform, is close to one side of the convex spherical reflector and is far away from the toroidal reflector;
the vacuum ultraviolet monochromator is horizontally arranged outside the vacuum tank, and a round hole with a small aperture is additionally arranged at an incident diaphragm of the vacuum ultraviolet monochromator to generate a quasi-parallel light beam with the diameter of 1-5 mm; the vacuum ultraviolet monochromator is provided with a light source.
As one improvement of the technical scheme, the toroidal reflecting mirror is inclined towards the outside of the vacuum tank by 15.8-16.4 degrees.
As an improvement of the above technical solution, an optical axis of the vacuum ultraviolet monochromator coincides with an optical axis of the convex spherical reflector, and the quasi-parallel light beam is emitted from the ultraviolet monochromator to the convex spherical reflector.
As an improvement of the above technical scheme, an optical axis of the toroidal reflector coincides with an optical axis of the to-be-measured satellite-borne hyperspectral remote sensing camera, and the converged light beam shaped by the toroidal reflector is reflected to an incident diaphragm of the to-be-measured satellite-borne hyperspectral remote sensing camera to form a calibration light path, so that calibration is completed.
As one improvement of the technical scheme, the vacuum electric two-dimensional translation mechanism is connected with an external control system through a socket arranged on a flange of the vacuum tank, and controls the spectrum to be self-scanned in the fields of space and spectrum dimension;
it includes: an X-direction translation stage and a Y-direction translation stage; the X-direction translation table and the Y-direction translation table are both connected with the connecting tool.
As one improvement of the technical scheme, the convex spherical reflector translates 0-3mm along the X direction on the X direction translation table to realize the scanning of the calibration light beam in the spectral dimension direction, and the corresponding scanning angle is 0-12 degrees.
As one improvement of the technical scheme, the convex spherical reflector translates 0-3mm along the Y direction on the translation stage in the Y direction to realize the scanning of the calibration light beam in the space dimension direction, and the corresponding scanning angle is 0-12 degrees.
As one improvement of the technical scheme, the vacuum tank provides a vacuum and cryogenic environment for the satellite-borne hyperspectral remote sensing camera to be detected, and the in-orbit working environment of the satellite is simulated.
The invention also provides a calibration method of the vacuum ultraviolet band spectrum calibration device of the satellite-borne hyperspectral remote sensing camera, which comprises the following steps:
the light radiation emitted by a light source is incident to a vacuum ultraviolet monochromator, the vacuum ultraviolet monochromator transmits the received light radiation to a cylindrical collimated light beam with the diameter of 1-5mm through a round hole with the diameter of 1-5mm which is additionally arranged at an incident diaphragm of the vacuum ultraviolet monochromator;
emitting a cylindrical collimated light beam with the diameter of 1-5mm from a vacuum ultraviolet monochromator to a convex spherical reflector for divergence to obtain a diverged light beam;
controlling an electric two-dimensional translation table to enable a convex spherical reflector to move along the X direction or the Y direction, and then reflecting the dispersed light beams to a toroidal reflector to obtain converged light beams converged in the spectral dimension direction and collimated in the spatial dimension direction;
and controlling the electric two-dimensional translation table to enable the convex spherical reflector to move along the X direction or the Y direction, and enabling the converged light beams to be incident to an incident diaphragm of the satellite-borne hyperspectral remote sensing camera 5 to be detected to form a calibration light path so as to finish calibration.
Compared with the prior art, the invention has the beneficial effects that:
1. the calibration device can simultaneously control the collimation of the light beams in the space dimension direction and the convergence in the spectrum dimension direction, realizes the infinite object distance in the space dimension direction and the limited object distance in the spectrum dimension direction, and solves the problem that the existing calibration device can not adjust the object distances in different space dimensions;
2. by translating the convex spherical reflector, the field scanning of at least twelve degrees of spatial dimension can be realized by only a few millimeters of displacement, and the problems of limited field test and reduced test precision caused by the fact that the whole camera to be tested is required to rotate when the existing device is used for carrying out full-field test are solved;
3. the calibration light path realized in the calibration device is a total reflection light path, and compared with the existing transmission type collimation light path, the calibration device has the characteristics of high transmittance and wide coverage spectrum.
Drawings
FIG. 1(a) is a schematic diagram of a spectrum dimension converging light beam of a calibration light path of a vacuum ultraviolet band spectrum calibration device of a satellite-borne hyperspectral remote sensing camera according to the invention;
FIG. 1(b) is a schematic diagram of a space-dimensional collimated light beam of a calibration light path of a vacuum ultraviolet band spectrum calibration device of a satellite-borne hyperspectral remote sensing camera according to the invention;
FIG. 2 is a schematic structural diagram of a vacuum ultraviolet band spectrum calibration device of a satellite-borne hyperspectral remote sensing camera according to the invention;
FIG. 3 is a schematic view of a combination of a calibration light path of the vacuum ultraviolet band spectrum calibration device of the satellite borne hyperspectral remote sensing camera and a light path of the satellite borne hyperspectral remote sensing camera to be measured;
FIG. 4 is a schematic structural diagram of a convex spherical reflector of the vacuum ultraviolet band spectrum calibration device of the satellite-borne hyperspectral remote sensing camera, which is locally enlarged and is installed on an electric two-dimensional translation table through a connecting tool;
FIG. 5 is a schematic structural diagram of the movement of the Y-direction translation stage of the electric two-dimensional translation stage of the vacuum ultraviolet band spectrum calibration device of the satellite-borne hyperspectral remote sensing camera along the up-down direction;
FIG. 6(a) is a schematic diagram of a light path of a to-be-measured satellite-borne hyperspectral remote sensing camera of a vacuum ultraviolet band spectrum calibration device of a satellite-borne hyperspectral remote sensing camera after scanning in a space dimension direction;
FIG. 6(b) is a schematic diagram of a light path of a to-be-measured satellite-borne hyperspectral remote sensing camera of the vacuum ultraviolet band spectrum calibration device of the satellite-borne hyperspectral remote sensing camera after scanning in the spectral dimension direction;
FIG. 7 is a light plate schematic diagram of a calibration light path of the vacuum ultraviolet band spectrum calibration device of the satellite-borne hyperspectral remote sensing camera at a focal plane.
Reference numerals:
1. convex spherical reflector 2 and toroidal reflector
3. Electric two-dimensional translation stage 4 and image plane
5. Satellite-borne hyperspectral remote sensing camera 6 to be detected and X-direction translation table
7. Y-direction translation table 8 and connecting tool
9. Vacuum tank 10 and vacuum ultraviolet monochromator
11. Light source 12 and operation platform
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
The invention provides a vacuum ultraviolet band spectrum calibration device of a satellite-borne hyperspectral remote sensing camera, which is used for vacuum ultraviolet band spectrum calibration and light path calibration of the vacuum ultraviolet hyperspectral camera under a spectrum dimension limited object distance, is a calibration light path design of beam shaping and field of view self-scanning, utilizes the combination of a toroidal reflector and a spherical reflector to respectively control the angles of light beams on a meridian plane and a sagittal plane, and can meet the object distance requirements of the satellite-borne hyperspectral remote sensing camera on different space dimensions. By moving the spatial position of the spherical reflector, the light beams are enabled to continuously scan on the sagittal plane and the meridian plane, and the field-of-view self-scanning of the camera is realized.
As shown in fig. 2 and 4, the scaling apparatus includes: the device comprises a convex spherical reflector 1, a toroidal reflector 2, a vacuum electric two-dimensional translation mechanism 3, an operating platform 12, a to-be-detected satellite-borne hyperspectral remote sensing camera 5, a vacuum tank 9, a vacuum ultraviolet monochromator 10 and a light source 11;
the convex spherical reflector 1, the toroidal reflector 2, the vacuum electric two-dimensional translation mechanism 3, the operating platform 12 and the to-be-detected satellite-borne hyperspectral remote sensing camera 5 are all arranged in the vacuum tank 9;
the convex spherical reflector 1 and the toroidal reflector 2 are placed on the operating platform 12 through respective mirror frames and mirror frames, the convex spherical reflector 1 and the toroidal reflector 2 are placed in a staggered manner, and the toroidal reflector 2 inclines towards the outside of the vacuum tank 9; the convex spherical reflector 1 is arranged on a vacuum electric two-dimensional translation mechanism 3 on an operating platform 12 through a connecting tool 8 to realize horizontal and vertical movement, and a satellite-borne hyperspectral remote sensing camera 5 to be measured is arranged on the operating platform 12, is close to one side of the convex spherical reflector 1 and is far away from the toroidal reflector 2;
the vacuum ultraviolet monochromator 10 is horizontally arranged outside the vacuum tank 9, and a round hole with a small aperture is additionally arranged at an incident diaphragm of the vacuum ultraviolet monochromator 10 and is used for generating a quasi-parallel light beam with the diameter of 1-5 mm; the vacuum ultraviolet monochromator 10 is provided with a light source 11 for providing light radiation required by a spectrum calibration test.
The diameter size of the round hole with the small aperture is determined according to the sensitivity of the satellite-borne hyperspectral remote sensing camera 5 to be detected, and the satellite-borne hyperspectral remote sensing camera 5 to be detected is ensured to emit a quasi-parallel light beam with the diameter of 1-5 mm.
The toroidal mirror 2 is tilted 15-16 degrees, preferably 15.8-16.4 degrees, towards the outside of the vacuum tank 9.
The optical axis of the ultraviolet monochromator 10 coincides with the optical axis of the convex spherical reflector 1 for transmitting the quasi-parallel light beam from the ultraviolet monochromator 10 to the convex spherical reflector 1.
And the optical axis of the toroidal reflector 2 coincides with the optical axis of the to-be-measured satellite-borne hyperspectral remote sensing camera 5, and the converged light beam shaped by the toroidal reflector 2 is reflected to an incident diaphragm of the to-be-measured satellite-borne hyperspectral remote sensing camera 5 to finish calibration.
The convex spherical reflector 1 is a convex reflector, and the toroidal reflector 2 is a concave reflector.
The toroidal reflector 2 controls the light beam angle of the space dimension and the spectrum dimension, and shapes the light beam diverged by the convex spherical reflector 1 into a cylindrical converged light beam, and the converged light beam is converged in the spectrum dimension direction and is parallel in the space dimension direction. Thus, as shown in fig. 1(a) and 1(b), an object distance of infinity in the spatial dimension and a finite distance in the spectral dimension is achieved.
As shown in fig. 4 and 5, the vacuum electric two-dimensional translation mechanism 3 is connected with an external control system through a socket arranged on a flange of the vacuum tank 9, and is used for controlling the spectrum to be self-scanned in the fields of view of space and spectral dimensions, and comprises: an X-direction translation stage and a Y-direction translation stage; the X-direction translation table and the Y-direction translation table are both connected with a connecting tool, and the convex spherical reflector 1 is controlled to move along the X direction and the Y direction through an external control system, so that the scanning of light beams in the space dimension and the spectrum dimension can be correspondingly realized.
The convex spherical reflector 1 is translated along the X direction by 0-3mm on the X direction translation table to realize the scanning of the calibration light beam in the spectral dimension direction, and the corresponding scanning angle is 0-12 degrees.
The convex spherical reflector 1 translates the translation stage in the Y direction by 0-3mm along the Y direction to realize the scanning of the calibration light beam in the space dimension direction, and the corresponding scanning angle is 0-12 degrees.
The vacuum tank provides a vacuum and cryogenic environment for the satellite-borne hyperspectral remote sensing camera 5 to be detected, and the in-orbit working environment of the satellite is simulated.
The working process of the calibration device of the invention is as follows:
(1) a round hole with a small aperture is additionally arranged at an incident diaphragm of the vacuum ultraviolet monochromator and is used for generating a quasi-parallel light beam with the diameter of 1-5 mm;
(2) the quasi-parallel light beams are emitted to the convex spherical reflector 1 and then are diverged, and the diverged light beams are reflected to the toroidal reflector and are shaped into cylindrical converged light beams, and the converged light beams are converged in the spectral dimension direction and are parallel in the spatial dimension direction. Thus, as in FIGS. 1(a) and 1(b), the object distance is infinite in the spatial dimension and finite in the spectral dimension;
(3) moving the convex spherical reflector 1 up and down along the Y direction, i.e. up and down as shown in FIG. 4; the scanning of the quasi-parallel light beams in the spectral dimension direction can be realized, and the corresponding scanning angle is 12 degrees;
moving the convex spherical reflector 1 along the X direction, i.e. the front and back direction perpendicular to the paper as shown in FIG. 5; scanning of the quasi-parallel beams in the spatial dimension can be achieved with a corresponding scan angle of 12 degrees.
The invention provides a calibration method of a vacuum ultraviolet band spectrum calibration device of a satellite-borne hyperspectral remote sensing camera, which comprises the following steps:
the light radiation emitted by the light source is incident to the vacuum ultraviolet monochromator 10, the vacuum ultraviolet monochromator 10 transmits the received light radiation to a cylindrical collimated light beam with the diameter of 1-5mm through a round hole with the diameter of 1-5mm which is additionally arranged at an incident diaphragm of the vacuum ultraviolet monochromator 10;
the heights of the calibration light path and the to-be-measured satellite-borne hyperspectral remote sensing camera 5 are adjusted, so that the cylindrical collimated light beam emitted by the monochromator, the optical axis of the calibration light path and the optical axis of the to-be-measured satellite-borne hyperspectral remote sensing camera 5 are at the same height.
Emitting a cylindrical collimated light beam with the diameter of 1-5mm from the vacuum ultraviolet monochromator 10 to the convex spherical reflector 1, and then diverging to obtain a diverged light beam;
controlling an electric two-dimensional translation table 3 to enable the convex spherical reflector 1 to move along the X direction or the Y direction, and reflecting the diverged light beams to the toroidal reflector 2 to realize the light beams converged in the spectral dimension direction and collimated in the spatial dimension direction;
wherein the diameter of the converged light beam is 30 mm; the cone angle of the spectrum dimensional light beam of the converged light beam is 12 degrees, the scanning angle of the space dimensional light beam is 12 degrees, and the diameter of the spectrum dimensional light spot is 0.3 mm.
And controlling the electric two-dimensional translation table 3 to enable the convex spherical reflector 1 to move along the X direction or the Y square direction, and enabling the converged light beams to be incident to an incident diaphragm of the satellite-borne hyperspectral remote sensing camera 5 to be measured, so as to form a calibration light path and finish calibration as shown in figure 3.
In other embodiments, the calibration device can be used for optical calibration and field of view testing.
In the calibration method of the present embodiment, a point diagram of the generated converged light beam at the focal plane is shown in fig. 7, where black dots represent light spots of the converged light beam at the focal plane, an abscissa represents a width of the converged light beam in a spatial dimension, and an ordinate represents a width of the converged light beam in a spectral dimension. The width of the spectrum dimension is 0.3mm, and the width is smaller than the slit width of most of hyperspectral cameras of the type, so that the use requirement can be met. The field of view ranges in the spatial dimension of 12 degrees and the spectral dimension of 12 degrees, and the design result can meet the requirements of most of hyperspectral cameras of the type.
The convex spherical reflector 1 is translated by 0-3mm along the X direction on the X direction translation stage by using the electric two-dimensional translation stage 3, so that the scanning of the light beam in the spectral dimension direction can be realized, the corresponding scanning angle is 12 degrees, and the slit in the spectral dimension direction of the camera can be filled by scanning for multiple times, as shown in fig. 5.
As shown in fig. 6(a) and 6(b), the convex spherical reflector 1 is translated by 0-3mm along the Y direction on the Y direction translation stage by using an electric two-dimensional translation stage, so that the scanning of the light beam in the spatial dimension direction can be realized, and the corresponding scanning angle is 12 degrees.
In this embodiment, the light source is a deuterium lamp.
The convex spherical reflector 1 and the toroidal reflector 2 are made of K9, quartz or microcrystalline materials, and the film layer can be made of silicon carbide or Al + MgF2 according to the requirements of different wave bands; the mirror frame and the support for supporting the convex spherical reflector 1 and the toroidal reflector 2 are made of aluminum materials.
In the present embodiment, the specific parameters of the convex spherical mirror 1 and the toroidal mirror 2 are as follows:
the calibration light path for the spectral dimension finite object distance of the embodiment is evaluated by the following three evaluation means:
1. spectral dimension spot diameter
The light spot diameter of the spectral dimension is the direct evaluation of the image quality of the calibration light path, the light spot diameter of the calibration light path of the invention in the spectral dimension is 0.3mm, the entrance pupil diameter of the corresponding spectral dimension is 1mm, and the requirement can be met, as shown in fig. 7;
2. spectral dimension beam angle
The spectrum dimension light beam angle determines the application range of the calibration light path, the spectrum dimension light beam angle of the calibration light path is 12 degrees, and the requirement of the hyperspectral camera of the type can be met;
3. spatial dimension light beam scanning range
The space dimension light beam scanning range determines the application range of the calibration light path, the space dimension light beam scanning angle of the calibration light path is 12 degrees, and the requirement of the hyperspectral camera of the type is met.
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. The utility model provides a vacuum ultraviolet band spectrum calibration device of satellite-borne hyperspectral remote sensing camera which characterized in that, this calibration device includes: the device comprises a convex spherical reflector (1), a toroidal reflector (2), a vacuum electric two-dimensional translation mechanism (3), an operating platform (12), a to-be-detected satellite-borne hyperspectral remote sensing camera (5), a vacuum tank (9), a vacuum ultraviolet monochromator (10) and a light source (11);
the convex spherical reflector (1), the toroidal reflector (2), the vacuum electric two-dimensional translation mechanism (3), the operating platform (12) and the satellite-borne hyperspectral remote sensing camera (5) to be measured are all arranged in the vacuum tank (9);
the convex spherical reflector (1) and the toroidal reflector (2) are placed on the operating platform (12) through respective mirror frames and mirror frames, the convex spherical reflector (1) and the toroidal reflector (2) are placed in a staggered mode, and the toroidal reflector (2) inclines towards the outside of the vacuum tank (9); the convex spherical reflector (1) is arranged on a vacuum electric two-dimensional translation mechanism (3) on an operation platform (12) through a connecting tool (8), and the satellite-borne hyperspectral remote sensing camera (5) to be measured is arranged on the operation platform (12), is close to one side of the convex spherical reflector (1) and is far away from the toroidal reflector (2);
the vacuum ultraviolet monochromator (10) is horizontally arranged outside the vacuum tank (9), and a round hole with a small aperture is additionally arranged at an incident diaphragm of the vacuum ultraviolet monochromator (10) to generate a quasi-parallel light beam with the diameter of 1-5 mm; a light source (11) is arranged on the vacuum ultraviolet monochromator (10).
2. The vacuum ultraviolet band spectrum calibration device of the satellite-borne hyperspectral remote sensing camera according to claim 1, characterized in that the toroidal mirror (2) is tilted 15.8-16.4 degrees outwards towards the vacuum tank (9).
3. The vacuum ultraviolet band spectrum calibration device of the spaceborne hyperspectral remote sensing camera according to claim 1, characterized in that the optical axis of the vacuum ultraviolet monochromator (10) coincides with the optical axis of the convex spherical reflector (1) and emits a quasi-parallel light beam from the vacuum ultraviolet monochromator (10) to the convex spherical reflector (1).
4. The vacuum ultraviolet band spectrum calibration device of the spaceborne hyperspectral remote sensing camera as claimed in claim 1, wherein the optical axis of the toroidal reflector (2) coincides with the optical axis of the spaceborne hyperspectral remote sensing camera (5) to be tested, and the converged light beam shaped by the toroidal reflector (2) is reflected to the incident diaphragm of the spaceborne hyperspectral remote sensing camera (5) to be tested to form a calibration light path to complete calibration.
5. The vacuum ultraviolet band spectrum calibration device of the satellite-borne hyperspectral remote sensing camera according to claim 1, characterized in that the vacuum electric two-dimensional translation mechanism (3) is connected with an external control system through a socket arranged on a flange of a vacuum tank (9) to control the self-scanning of the spectrum in the fields of space and spectrum dimensions;
it includes: an X-direction translation stage and a Y-direction translation stage; the X-direction translation table and the Y-direction translation table are both connected with a connecting tool (8).
6. The vacuum ultraviolet band spectrum calibration device of the satellite-borne hyperspectral remote sensing camera according to claim 5, characterized in that the convex spherical reflector (1) translates the platform in the X direction by 0-3mm to realize the scanning of the calibration beam in the spectral dimension direction, and the corresponding scanning angle is 0-12 degrees.
7. The vacuum ultraviolet band spectrum calibration device of the satellite-borne hyperspectral remote sensing camera according to claim 5, characterized in that the convex spherical reflector (1) translates along the Y direction by 0-3mm on a translation stage in the Y direction to realize the scanning of a calibration light beam in the space dimension direction, and the corresponding scanning angle is 0-12 degrees.
8. The vacuum ultraviolet band spectrum calibration device of the satellite-borne hyperspectral remote sensing camera according to claim 1, characterized in that the vacuum tank (9) provides a vacuum and cryogenic environment for the satellite-borne hyperspectral remote sensing camera (5) to be tested, and simulates an in-orbit working environment of a satellite.
9. A calibration method of a vacuum ultraviolet band spectrum calibration device of a satellite-borne hyperspectral remote sensing camera comprises the following steps:
the light radiation emitted by a light source is incident to a vacuum ultraviolet monochromator (10), the vacuum ultraviolet monochromator (10) transmits the received light radiation to a cylindrical collimated light beam with the diameter of 1-5mm through a round hole which is additionally arranged at an incident diaphragm of the vacuum ultraviolet monochromator (10);
emitting a cylindrical collimated light beam with the diameter of 1-5mm from a vacuum ultraviolet monochromator (10) to a convex spherical reflector (1) and then diverging to obtain a diverged light beam;
controlling an electric two-dimensional translation table (3) to enable a convex spherical reflector (1) to move along the X direction or the Y direction, reflecting the diverged light beams to a toroidal reflector (2) to obtain converged light beams converged in the spectral dimension direction and collimated in the spatial dimension direction;
and controlling the electric two-dimensional translation table (3) to enable the convex spherical reflector (1) to move along the X direction or the Y direction, and enabling the converged light beams to be incident to an incident diaphragm of the satellite-borne hyperspectral remote sensing camera 5 to be detected to form a calibration light path to finish calibration.
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