Side sheltered solar halo photometer

Abstract

The invention relates to a side sheltered solar halo photometer. The photometer comprises an external baffle plate, an external window, an upper stray light eliminating diaphragm, a lower stray light eliminating diaphragm, an intermediate diaphragm, a second attenuation sheet, an aperture diaphragm, an object lens, a filter wheel and a CCD camera which are arranged from the left to the right in turn. The middle part of the external baffle plate is provided with a first attenuation sheet. The first attenuation sheet, the second attenuation sheet, the aperture diaphragm, the object lens and the CCD camera are arranged on the same axis. Direct sunlight enters an optical system to be imaged on the image plane of the CCD camera through the first attenuation sheet and the second attenuation sheet. The sky brightness is imaged on the image plane of the CCD camera through the second attenuation sheet. The relative value of the sky brightness and the solar brightness can be obtained through the brightness ratio on the image plane of the CCD camera with combination of the attenuation magnitude of the first attenuation sheet. The advantages of the side sheltered solar halo photometer are that the diffraction light intensity of the internal view field can be greatly reduced, the observable range of the internal view field can be enhanced, the sky brightness is observed from the side plane and the sky brightness of the solar range of the radial view field can be increased.

Description

technical field [0001] The invention relates to a halo photometer measuring device, in particular to a side shielding heliophotometer. Background technique [0002] The halophotometer is mainly used for the site selection of the coronagraph, and determines whether it meets the requirements of the coronagraph observation by measuring the brightness scattered by the sky. At present, there are two main types of halo photometers used internationally, one is the Evans Sky Photometer (ESP) invented by John W. Evans in 1948, and the other is the SkyBrightness Monitor (SBM) placed by Haosheng Lin et al. in Hawaii in 2004. . The halo photometer manufactured by the Yunnan Astronomical Observatory of the Chinese Academy of Sciences in 2011 is modeled on a halo photometer manufactured by SBM, but with some improvements and the use of a more advanced CCD, its time resolution is greatly improved. ESP and SBM are placed in multiple solar observatories for long-term halo photometry, and t...

AI Technical Summary

Problems solved by technology

Its disadvantage is mainly that the diffracted light in the inner field of view and the outer field of view is very strong, which limits the observation of the inner field of view and the outer field of view. In the captured image, two bright rings are generated in the inner field of view and the outer field of view. Makes its minimum actual inner field of view only 4R ⊙ (R ⊙ is the average radius of the solar photosphere)

The halo photometer of Yunnan Astronomical Observatory has suppressed part of the diffraction of the outer field of view, but the suppression method is to reduce the aperture of the third aperture. This method will reduce the diffraction of the outer field of view, but at the same time it will make the outer field of view The vignetting increases, and even directly reduces the actual observable outer field of view

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