Internally occulting type imaging system of transmission ground-based coronagraph

Abstract

The invention discloses an internally occulting type imaging system of a transmission occulting coronagraph, and aims to solve the problem that stray light is difficult to restrain in the prior art. The system comprises an incident aperture diaphragm, an objective lens, an internally occulting body, a field lens, an Lyot diaphragm, an Lyot spot and a relay lens group which are mounted on an optical axis in a lens cone according to a sequential order after sunlight enters the lens cone, wherein the incident aperture diaphragm is located in the first surface position of the objective lens; the internally occulting body is located in the imaging focal plane position of the objective lens; the Lyot diaphragm is located in the imaging focal plane position, where the incident aperture diaphragm passes through, of the objective lens; the Lyot spot is located in the imaging focal plane position of the field lens; and after sunlight beams are focused by the objective lens, sunlight on a solar photosphere layer is shaded by the internally occulting body, and the obtained light beams are imaged on an image plane CCD (charge coupled device) through the field lens and the relay lens group. The internally occulting type imaging system of the transmission ground-based coronagraph is provided with the internally occulting body and the Lyot spot, ghost images can be effectively blocked, and the stray light restraining capacity of the transmission ground-based coronagraph is further improved, therefore, the system can be used for observing sun corona.

Description

technical field [0001] The invention belongs to the technical field of solar-terrestrial space, and in particular relates to an inner-covered transmission ground-based coronagraph imaging system. Background technique [0002] The corona is the outer atmosphere of the sun. It not only has the high-speed outflow of the solar wind, but also a strong coronal mass ejection (CME), which emits strong ultraviolet and X-ray radiation. The activities of the corona are closely related to the solar-terrestrial space environment and space communication. Therefore, the observation of the corona, especially the coronal mass ejection (CME) phenomenon, can provide early warning of disastrous space weather affecting the earth and the space between the sun and the earth; the monitoring data of the corona can be In-depth study and understanding of the causes of CMEs and the interactions between CMEs and surrounding coronal structures, including coronal activities (such as flares, eruptions of p...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose an inner-covered transmission ground-based coronagraph imaging system to solve the problem that stray light is difficult to suppress in the prior art

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