为满足地基大口径主焦点式望远镜的多谱段观测需求,对比研究了滤光片切换机构的结构形式。针对传统形式滤光轮机构的缺点,设计了一种沿光轴圆周均布式的新型滤光轮机构,以实现将不同透过谱段的滤光片依次在光路中切入和切出。该滤光轮...为满足地基大口径主焦点式望远镜的多谱段观测需求,对比研究了滤光片切换机构的结构形式。针对传统形式滤光轮机构的缺点,设计了一种沿光轴圆周均布式的新型滤光轮机构,以实现将不同透过谱段的滤光片依次在光路中切入和切出。该滤光轮机构由驱动组件和滤光片组件组成,与传统形式滤光轮机构相比,该机构安装时无需与光轴偏置,充分利用了光轴圆周空间,能够减小对主镜的遮拦。首先,介绍了滤光轮机构的组成及工作原理,并对关键部件进行了选型计算。随后,对滤光轮机构进行了模态分析,其一阶固有频率为108 Hz。最后,对滤光轮机构进行了切换精度测量、滤光片面形精度检测以及高低温试验。检测和试验结果表明,该滤光轮机构的滤光片切入后偏心误差最大为0.1 mm,滤光片面形精度均方根(Root Mean Square,RMS)值均优于λ/30,在系统的工作温度范围内切换顺畅无卡滞。该滤光轮机构能够满足大口径主焦点式望远镜的多谱段观测要求,为滤光轮设计提供了新思路。展开更多
To realize effective co-phasing adjustment in large-aperture sparse-aperture telescopes,a multichannel stripe tracking approach is employed,allowing simultaneous interferometric measurements of multiple optical paths ...To realize effective co-phasing adjustment in large-aperture sparse-aperture telescopes,a multichannel stripe tracking approach is employed,allowing simultaneous interferometric measurements of multiple optical paths and circumventing the need for pairwise measurements along the mirror boundaries in traditional interferometric methods.This approach enhances detection efficiency and reduces system complexity.Here,the principles of the multibeam interference process and construction of a co-phasing detection module based on direct optical fiber connections were analyzed using wavefront optics theory.Error analysis was conducted on the system surface obtained through multipath interference.Potential applications of the interferometric method were explored.Finally,the principle was verified by experiment,an interferometric fringe contrast better than 0.4 is achieved through flat field calibration and incoherent digital synthesis.The dynamic range of the measurement exceeds 10 times of the center wavelength of the working band(1550 nm).Moreover,a resolution better than one-tenth of the working center wavelength(1550 nm)was achieved.Simultaneous three-beam interference can be achieved,leading to a 50%improvement in detection efficiency.This method can effectively enhance the efficiency of sparse aperture telescope co-phasing,meeting the requirements for observations of 8-10 m telescopes.This study provides a technological foundation for observing distant and faint celestial objects.展开更多
For segmented detectors,surface flatness is critical as it directly influences both energy resolution and image clarity.Additionally,the limited adjustment range of the segmented detectors necessitates precise benchma...For segmented detectors,surface flatness is critical as it directly influences both energy resolution and image clarity.Additionally,the limited adjustment range of the segmented detectors necessitates precise benchmark construction.This paper proposes an architecture for detecting detector flatness based on channel spectral dispersion.By measuring the dispersion fringes for coplanar adjustment,the final adjustment residual is improved to better than 300 nm.This result validates the feasibility of the proposed technology and provides significant technical support for the development of next-generation large-aperture sky survey equipment.展开更多
文摘为满足地基大口径主焦点式望远镜的多谱段观测需求,对比研究了滤光片切换机构的结构形式。针对传统形式滤光轮机构的缺点,设计了一种沿光轴圆周均布式的新型滤光轮机构,以实现将不同透过谱段的滤光片依次在光路中切入和切出。该滤光轮机构由驱动组件和滤光片组件组成,与传统形式滤光轮机构相比,该机构安装时无需与光轴偏置,充分利用了光轴圆周空间,能够减小对主镜的遮拦。首先,介绍了滤光轮机构的组成及工作原理,并对关键部件进行了选型计算。随后,对滤光轮机构进行了模态分析,其一阶固有频率为108 Hz。最后,对滤光轮机构进行了切换精度测量、滤光片面形精度检测以及高低温试验。检测和试验结果表明,该滤光轮机构的滤光片切入后偏心误差最大为0.1 mm,滤光片面形精度均方根(Root Mean Square,RMS)值均优于λ/30,在系统的工作温度范围内切换顺畅无卡滞。该滤光轮机构能够满足大口径主焦点式望远镜的多谱段观测要求,为滤光轮设计提供了新思路。
文摘To realize effective co-phasing adjustment in large-aperture sparse-aperture telescopes,a multichannel stripe tracking approach is employed,allowing simultaneous interferometric measurements of multiple optical paths and circumventing the need for pairwise measurements along the mirror boundaries in traditional interferometric methods.This approach enhances detection efficiency and reduces system complexity.Here,the principles of the multibeam interference process and construction of a co-phasing detection module based on direct optical fiber connections were analyzed using wavefront optics theory.Error analysis was conducted on the system surface obtained through multipath interference.Potential applications of the interferometric method were explored.Finally,the principle was verified by experiment,an interferometric fringe contrast better than 0.4 is achieved through flat field calibration and incoherent digital synthesis.The dynamic range of the measurement exceeds 10 times of the center wavelength of the working band(1550 nm).Moreover,a resolution better than one-tenth of the working center wavelength(1550 nm)was achieved.Simultaneous three-beam interference can be achieved,leading to a 50%improvement in detection efficiency.This method can effectively enhance the efficiency of sparse aperture telescope co-phasing,meeting the requirements for observations of 8-10 m telescopes.This study provides a technological foundation for observing distant and faint celestial objects.
文摘For segmented detectors,surface flatness is critical as it directly influences both energy resolution and image clarity.Additionally,the limited adjustment range of the segmented detectors necessitates precise benchmark construction.This paper proposes an architecture for detecting detector flatness based on channel spectral dispersion.By measuring the dispersion fringes for coplanar adjustment,the final adjustment residual is improved to better than 300 nm.This result validates the feasibility of the proposed technology and provides significant technical support for the development of next-generation large-aperture sky survey equipment.
