| CPC G01J 3/2823 (2013.01) [G01J 3/021 (2013.01); G01J 2003/2826 (2013.01)] | 9 Claims |
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1. A coaxial four-reflection optical system with visible light long-wave infrared common-aperture imaging, comprising a main reflecting mirror, a first transmitting mirror, a third reflecting mirror, a fourth reflecting mirror, a second transmitting mirror, a third transmitting mirror and a fourth transmitting mirror, wherein the main reflecting mirror, the first transmitting mirror, the third reflecting mirror and the fourth reflecting mirror are coaxially disposed and are all two-order aspherical mirrors; the main reflecting mirror is used as an aperture diaphragm of the coaxial four-reflection optical system with visible light long-wave infrared common-aperture imaging; a surface of the first transmitting mirror is coated with a film to split entering light into a visible light spectral segment and an infrared spectral segment; the third reflecting mirror and the main reflecting mirror are integrated, and light passing holes are formed in both the third reflecting mirror and the fourth reflecting mirror; the second transmitting mirror, the third transmitting mirror and the fourth transmitting mirror are all high-order aspherical transmitting mirrors; the first transmitting mirror, the fourth reflecting mirror, the second transmitting mirror, the third transmitting mirror and the fourth transmitting mirror are located on the same side of the main reflecting mirror;
the entering light is split into the visible light spectral segment and the infrared spectral segment by the first transmitting mirror after being reflected by the main reflecting mirror; the visible light spectral segment reaches the third reflecting mirror through the light passing hole on the fourth reflecting mirror after being reflected by the first transmitting mirror; the third reflecting mirror then reflects the light to the fourth reflecting mirror; the reflected light is converged to a first detector located at a focal plane after passing through the light passing hole on the third reflecting mirror to form an image on the first detector; the infrared spectral segment partially reaches the second transmitting mirror (5) after being transmitted by the first transmitting mirror; the transmitted light reaches the third reflecting mirror through the second transmitting mirror; the third transmitting mirror then transmits the light to the fourth transmitting mirror; the transmitted light is converged to a second detector located at the focal plane after being transmitted by the fourth transmitting mirror to form an image on the second detector;
a radius of curvature of a vertex of a reflecting surface of the main reflecting mirror is 714.536 mm; a radius of curvature of a vertex of an entering surface of the first transmitting mirror is 386.402 mm, and a radius of curvature of a vertex of an exiting surface of the first transmitting mirror is 177.540 mm; a radius of curvature of a vertex of a reflecting surface of the third reflecting mirror is 202.836 mm; a radius of curvature of a vertex of a reflecting surface of the fourth reflecting mirror is 264.466 mm; a radius of curvature of a vertex of an entering surface of the second transmitting mirror is 101.730 mm, and a radius of curvature of a vertex of an exiting surface of the second transmitting mirror is 125.377 mm; a radius of curvature of a vertex of an entering surface of the third transmitting mirror is 58.311 mm, and a radius of curvature of a vertex of an exiting surface of the third transmitting mirror is 107.076 mm; and a radius of curvature of a vertex of an entering surface of the fourth transmitting mirror is 60.574 mm, and a radius of curvature of a vertex of an exiting surface of the fourth transmitting mirror is 37.226 mm.
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