AIMS望远镜8~10微米成像终端系统装调检测方法

An Alignment and Testing Method of 8-10μm Imaging Terminal System of AIMS

针对用于太阳磁场精确测量的中红外观测系统(Accurate Infrared Magnetic field Measurements of the Sun,AIMS)望远镜8~10μm真空制冷成像终端系统的高精度装调需求,提出了一种基于中红外可调谐激光光源的宽谱段干涉检测和装调方法。首先,采用泰曼-格林干涉仪,利用参考臂可调的优势,弥补光源相干性不足的缺陷,从而实现8~10μm宽谱段的干涉测量。其次,完成了干涉仪光学系统设计,可同时兼顾8~10μm和可见光双波段的波前质量,解决了肉眼不可见给干涉仪自身装调带来的困难。设计结果表明,利用可见光激光器进行干涉仪自身装调,可达到RMS 0.05λ@0.633μm的波前精度;在8~10μm检测波段,干涉仪波前均方根优于0.001λ,可满足待测系统的检测需求。最后,基于逆向优化法仿真了8~10μm光学系统的装调流程。

In order to meet the requirements of high-precision alignment of the 8-10μm vacuum cooling imaging terminal system of AIMS,a method of broadband interference for alignment and test based on mid-infrared tunable laser source is proposed.First of all,the Twyman-Green interferometer is used to complement the lack of coherence of the light source by taking advantage of its adjustable reference arm,so that the 8-10μm broadband interferometry can be realized.Secondly,the optical design of the interferometer is completed,which can handle the wavefront quality of 8-10μm band and visible light band at the same time,so as to solve the difficulty of the interferometer′s self adjustment caused by invisibility.The design results show that the use of visible laser for self-installation and adjustment of the interferometer can achieve a wavefront accuracy of RMS 0.05λ@633 nm.In the detection band of 8-10μm,the RMS value of the interferometer wavefront can be better than 0.001λ,which can meet the detection requirements of the system under test.Finally,the assembly and adjustment process of the 8-10μm optical system is simulated based on the reverse optimization method.