基于介电润湿液体棱镜的大气色散校正  

Atmospheric Dispersion Correction Based on Electrowetting Liquid Prism

作　　者：俸银川 张安宁 朱杨冕 梁海鑫 寇松峰[2,3] 梁忠诚[1] 马晓波[1] 赵瑞[1] Feng Yinchuan;Zhang Anning;Zhu Yangmian;Liang Haixin;Kou Songfeng;Liang Zhongcheng;Ma Xiaobo;Zhao Rui(College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing 210023,Jiangsu,China;Nanjing Institute of Astronomical Optics&Technology,National Astronomical Observatories,Chinese Academy of Sciences,Nanjing 210042,Jiangsu,China;CAS Key Laboratory of Astronomical Optics&Technology,Nanjing Institute of Astronomical Optics&Technology,Nanjing 210042,Jiangsu,China)

机构地区：[1]南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院,江苏南京210023 [2]中国科学院国家天文台南京天文光学技术研究所,江苏南京210042 [3]中国科学院天文光学技术重点实验室,南京天文光学技术研究所,江苏南京210042

出　　处：《光学学报》2024年第23期202-210,共9页Acta Optica Sinica

基　　金：国家自然科学基金(12273085)。

摘　　要：随着现代望远镜口径的增大,大气色散效应对观测星体的影响越来越大。设计了一种应用于大气色散校正的介电润湿液体棱镜,其腔体内填充两种在中心波长589 nm处折射率相同但阿贝数不同的不混溶液体。理论计算了不同天顶距下的大气色散值,推导了液体棱镜偏转角与大气色散值的关系;借助COMSOL和ZEMAX软件仿真模拟了液体棱镜内部液-液平界面在不同偏转角情况下对可见光波段3.50″以内色散值的校正效果,得到了校正不同色散值所需的最佳偏转角,并与理论计算的最佳偏转角进行了比较。研究发现,该液体棱镜能够实现色散补偿,色散校正值与棱镜偏转角呈线性增大趋势。3.50″色散可见光经偏转角为1.421°的液体棱镜的色散补偿后,出射光的残余色散约为0.001238″,远小于常见望远镜的衍射极限。这种大气色散校正器具有响应速度快、无机械运动等特点,有望用于常见天顶距下的色散校正。Objective The atmosphere has varying refractive indices for different wavelengths of light,causing light emitted from a star to broaden as it passes through,leading to atmospheric dispersion.An increase in zenith distance results in greater atmospheric dispersion.When the atmospheric dispersion exceeds the diffraction limit of a telescope,the imaging quality significantly declines.As modern telescopes’apertures increase,the effect of atmospheric dispersion on imaging quality becomes more pronounced.To counteract atmospheric dispersion,atmospheric dispersion correctors(ADCs)are developed to generate compensatory dispersion.The two popular types of ADCs are linear atmospheric dispersion correctors(LADCs)and rotating atmospheric dispersion correctors(RADCs).Traditionally,ADCs are made of glass,but they face challenges such as high-accuracy mechanical moving parts,complex structures,bulkiness,wear issues,and high cost.We propose an atmospheric dispersion corrector based on electrowetting liquid prisms(ELADC),which offers fast response time,no mechanical movement,and effective dispersion correction at common zenith distances.Method The ELADC consists of two immiscible liquids with the same refractive index at a center wavelength of 589 nm but different Abbe numbers.The contact angles between the sidewalls and the liquid-liquid interface follow the Young-Lippmann equation.When the contact angle,controlled by the working voltage,is 90°and the interface is planar,this voltage is defined as the critical voltage.The two immiscible liquids form a planar interface with varying deflection angles under different critical voltage combinations.We theoretically deduce the relationship between the liquid prism’s deflection angle and atmospheric dispersion.The ELADC model is established in COMSOL,and simulations of the liquid-liquid interface deflection under various voltage combinations are performed.We analyze the atmospheric dispersion correction for 3.50″in the visible spectrum under different deflection angles and compa

关 键 词：大气色散校正器 液体棱镜 电润湿效应 大气色散 偏转角 

分 类 号：P111[天文地球—天文学]