双光栅色散复用光谱可调恒星光谱模拟系统设计方法  

Design Method of Spectral Tunable Stellar Spectrum Simulation System Based on Dual-Grating Dispersion Multiplexing

作　　者：徐达[1,2] 孙高飞 张杰瑞[1] 陈思文 乔家屹 刘显著 孟遥 刘石[1,2] Xu Da;Sun Gaofei;Zhang Jierui;Chen Siwen;Qiao Jiayi;Liu Xianzhu;Meng Yao;Liu Shi(Department of OptoElectronic Engineering,Changchun University of Science and Technology,Changchun 130022,Jilin,China;Jilin Engineering Research Center of Photoelectric Measurement&Control Instruments,Changchun 130022,Jilin,China)

机构地区：[1]长春理工大学光电工程学院,吉林长春130022 [2]吉林省光电测控仪器工程技术研究中心,吉林长春130022

出　　处：《光学学报》2024年第24期148-157,共10页Acta Optica Sinica

基　　金：国家自然科学基金(62105042)、空间智能控制技术实验室开放基金课题(HTKJ2022KL502004)。

摘　　要：针对星敏感器地面标定试验中模拟恒星光谱与观测恒星光谱不匹配,影响星敏感器地面光信号标定精度的问题,本文提出了一种结构简单的光谱可调恒星光谱模拟系统设计方法,该系统采用超连续激光作为照明光源,数字微镜作为光谱调制器件,以通过双光栅色散复用为基础,实现光谱的分光和准直成像,相比传统的基于空间光调制器件的恒星光谱模拟系统,本文设计的系统结构简单、易于装调,并且没有传统系统中普遍存在的谱线彗差、谱线弯曲等像差,降低了光谱精确模拟对高冗余光谱模拟算法的依赖。最后搭建了实验平台,对系统性能进行测试,在2600 K色温的光谱模拟精度为-4.9%,7000 K色温的光谱模拟精度优于-4.7%,11000 K色温的光谱模拟精度优于-4.2%,达到了预期性能,并与理论分析结果相一致。此外,提出的光谱模拟系统还可以满足空间相机的遥感辐射校准,以及高光谱图像投影仪和分子成像的光谱模拟要求,是一种具有广泛应用前景的光源。Objective Star sensors,the most accurate optical sensors for space attitude determination,are widely used in various applications.These sensors require high measurement accuracy and robust stellar spectral detection capabilities.However,ground calibration experiments for star sensors often encounter issues due to mismatches between simulated stellar spectra and observed stellar spectra,adversely affecting the accuracy of optical signal calibration.To address this,we propose a design method for a structurally simple spectral tunable stellar spectral simulation system.This system employs a supercontinuum laser as the illumination source and a digital micromirror for spectral modulation.We achieve multiplexing,spectral splitting,and collimation imaging based on dual grating dispersion.Compared with traditional stellar spectral simulation systems that rely on spatial light modulation devices,our system features a simpler structure,easier installation and adjustment,and avoids common aberrations such as spectral line coma and bending,thereby reducing reliance on complex spectral simulation algorithms.Methods We first analyze the factors affecting spectral simulation accuracy and utilize Gaussian distribution functions to represent the smallest spectral fitting units in spectral synthesis.We theoretically investigate the influence of varying halfpeak widths and spectral peak intervals on simulation accuracy.Our findings indicate that,for an ideal smooth curve,the accuracy of the spectral simulation depends on the spectral peak intervalωrather than the halfpeak width.Consequently,reducing the peak interval is crucial for achieving smooth spectral simulation.Based on this insight,we design a dual grating dispersion multiplexing adjustable stellar spectrum simulation system.To enhance energy utilization,we incorporate a laser shaping and beam expansion system instead of traditional slits and collimators in the splitting mechanism.Additionally,we implement a dual grating dispersion multiplexing splitting system that uses

关 键 词：光学设计 辐射定标 光谱模拟 空间光调制 

分 类 号：TH744[机械工程—光学工程]