低温辐射计吸收腔研制

针对高灵敏度低温辐射计研制需求,提出一种低温辐射计吸收腔.设计椭球面光阑的多次反射结构,同时采用扩散焊工艺,进而实现了椭球面光阑、斜口—斜底圆柱腔和斜底面三部分的焊接成形,以此形成有效光陷阱,使入射到吸收腔中的辐射被近似完全吸收.制备具备多孔结构的碳纳米管涂层,采用喷涂为主的工艺实现腔体内壁涂层的均匀性分布.基于积分球...

Study and Development of the Absorption Cavity of Cryogenic Radiometer

In response to the development needs of high-sensitivity cryogenic radiometer,a cryogenic radiometer absorption cavity is proposed.In this paper,The multiple reflection structure of the ellipsoid diaphragm is designed,and the diffusion welding process is adopted at the same time.The three-part welding formation of ellipsoid diaphragm,oblique opening-oblique bottom cylindrical cavity and oblique bottom surface is realized.In this way,an effective optical trap is formed,so that the radiation incident into the absorption cavity is almost completely absorbed.Preparation of carbon nanotube coatings with porous structure,and the uniform distribution of the coating on the inner wall of the cavity is achieved by spraying-based processes.An absorptivity measurement device was built based on the integrating sphere method,and the absorption rate of the cavity was measured.The results show that the absorption rate is better than 0.999 7 at typical laser wavelengths such as 476.2 nm,488.0 nm,514.5 nm,632.8 nm and 647.1 nm.