Semi-open type full circumferential coronagraph apparatus with large field of view
A semi-open, large field of view technology, applied in the direction of instruments, optical components, optics, etc., to reduce weight, reduce scattered stray light, and reduce the effect of scattered stray light
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[0028] see Figure 1-Figure 3 , the present invention discloses a semi-open full-circumferential large field of view coronagraph device. The coronagraph device includes an outer shelter 1, an outer window 2, a heat-repelling mirror 4, an inner shelter 12, and an inner shelter light absorption groove from left to right. 5. Imaging system 6 and CCD camera 7.
[0029] The coronagraph device has a semi-open square structure as a whole, and the outer window 2 is arranged on the left side of the square structure. The outer window 2 has a U-shaped aperture with an upper end opening, and direct sunlight enters the optical system from the left side of the outer window 2 . The diffraction light intensity of the U-shaped aperture of the square structure at the center of the back field is smaller than that of the circular aperture of the cylindrical structure, which can be calculated according to the Fresnel Kirchhoff diffraction integral formula 1.1, and the Fresnel Kirchhoff diffraction...
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