Cassette telescope athermalization device and method based on structure compensation

• Main Authors: JING XU, ZHANG SILONG, LI YANG, CHEN GONGYE, HOU ZAIHONG, QIN LAIAN
• Format: Patent
• Language: Chinese; English
• Published: 20.08.2024
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

The invention belongs to the technical field of telescopes, and particularly relates to a cassette telescope athermalization device and method based on structure compensation. The device comprises a supporting structure, two ends of the supporting structure are correspondingly and coaxially provided with a primary mirror and a secondary mirror, and the supporting structure is made of a thermal expansion and cold contraction material, so that the variation of focal planes of the primary mirror and the secondary mirror is kept within a focal depth range under the condition of a set temperature difference range. According to the invention, the supporting structure is made of a material which expands with heat and contracts with cold, and the defocusing amount generated by the reflecting mirror surface can be offset by utilizing the athermalization principle, namely reasonably designing the proportion of the effective supporting length, so that the defocusing problem of the cassette telescope in a certain tempera