基于冷光学技术的地基大型望远镜多波段红外杜瓦低温光机平台

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关键词：冷光学；红外探测；低温光机平台；多光路

中图分类号：TH743 文献标识码：A

doi：10.37188/OPE.20253321.3364 CSTR：32169.14.OPE.20253321.3364

Abstract： Based on cryogenic optical technology，the multi-band infrared imaging Dewar is a key compo nent forachieving high-sensitivity infrared detection. This paper presents a cryogenic opto-mechanical platform operating at 100K ，developed for a multi-band infrared Dewar. Design objectives and principles were established according to system requirements，and a methodology employing flexure structures was adopted to obtain a cryogenic platform with controlld deformation. Thermal deformation of the platform was then investigated by finite element analysis（FEA）and experimentally validated.For the long-wave optical path，measured displacements of 0.37mm in the X direction and 0.04mm in the Z direction were obtained，whileFEApredicted 0.387mm and 0.021mm ，respectively. For the mid-wave optical path， measured displacements of 0.36mm in the X direction and 0.03mm in the ΔY direction were obtained， with FEA predicting 0.385mm and 0.031mm ，respectively. All discrepancies between analysis and measurement are approximately within 0.02mm ，demonstrating the validity of the cryogenic platform design and ensuring accurate positioning of the beam spliter，long-wave imaging lens assembly，and mid-wave imaging lens assembly at cryogenic temperatures. The findings ofer valuable guidance for future cryogenic opto-mechanical designs in multi-band imaging Dewar systems.

Key words： cryogenic optics; infrared detection; cryogenic opto-mechanical platform；multi-optical path

1引言

地基红外观测长期面临大气干扰（如水汽、二氧化碳对红外波段的吸收）和热噪声的挑战。（剩余11046字）