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Spherical reflection type coronagraph

A technology of spherical reflection and coronagraph, applied in instruments, optical components, optics, etc., can solve problems such as vignetting and chromatic aberration, complex structure of coronagraph, etc., reduce geometric size, reduce processing and development difficulty, suppress miscellaneous The effect of astigmatism

Inactive Publication Date: 2014-09-17
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problems of complex structure, vignetting and chromatic aberration in the prior art, and provide a spherical reflective coronagraph

Method used

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  • Spherical reflection type coronagraph
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Embodiment Construction

[0014] The coronagraph of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0015] Such as figure 1 As shown, the spherical reflective coronagraph of the present invention includes a main objective lens M1, a secondary mirror M2, an imaging mirror M3, a plane mirror M4, a first aperture A0, a second aperture A1 and a CCD detector. Among them, the main objective lens M1, the secondary mirror M2 and the imaging mirror M3 are all spherical mirrors, the main objective lens M1, the secondary mirror M2 and the imaging mirror M3 are set off-axis; the secondary mirror M2 has a hole in the center, and the opening radius In the formula, k is the ratio of the inner edge of the field of view required by the design of the coronagraph to the sun's opening angle, R is the radius of the sun, d is the distance from the sun to the working position of the coronagraph, f 1 is the focal length of the main objective lens M1, r 1 is t...

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Abstract

The invention discloses a spherical reflection type coronagraph, and belongs to the technical field of coronagraphs. The spherical reflection type coronagraph solves the technical problems that in the prior art, a coronagraph is complex in structure and vignetting and chromatic aberration exist. The coronagraph comprises a primary object lens, a secondary lens, an image-forming mirror, a plane mirror, a first diaphragm, a second diaphragm and a CCD detector. After passing through the first diaphragm, light of the solar photosphere and light of the corona area enter the primary object lens and are reflected to the secondary lens by the primary object lens. The light of the solar photosphere is blocked by a hole of the secondary lens. After being reflected by the secondary lens and the image-forming mirror in sequence, the light of the corona area passes through the second diaphragm, reaches the plane mirror and is deflected to the CCD detector by the plane mirror to form images. After being reflected by the primary object lens, the secondary lens and the image-forming mirror in sequence, diffracted light generated when the light of the solar photosphere shines on the edge of the first diaphragm is blocked by the second diaphragm. The coronagraph is free of influence of chromatic aberration, capable of working at various wave bands and simple in structure, stray light of the reflection coronagraph is effectively restrained, and the geometric dimension of the coronagraph is decreased.

Description

technical field [0001] The invention relates to a spherical reflective coronagraph, which belongs to the technical field of coronagraphs. Background technique [0002] Solar corona imaging observation is one of the important means of space weather forecasting. For corona imaging, the biggest difficulty is that the brightness of the corona is extremely weak compared to the photosphere and chromosphere of the sun. Therefore, the design of the coronagraph needs to focus on the entrance pupil edge diffraction caused by the sun shining on the instrument and the primary mirror itself. The problem of scattering. In the prior art, there are mainly two structures of coronagraphs: one is an off-axis structure that uses a combination of reflectors and transmission mirrors, and the other is a structure that uses a combination of external and internal light shielding with multiple lenses. However, this Both structures are relatively complex, and there are problems of vignetting and chr...

Claims

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Application Information

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IPC IPC(8): G02B17/06
Inventor 陈波李达刘鹏
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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