利用可变形衬套减小光机械界面表面波前误差新概念的实验验证

IF 1.5 Q3 ASTRONOMY & ASTROPHYSICS Journal of Astronomical Instrumentation Pub Date : 2022-03-02 DOI:10.1142/s2251171722500039
S. Nagabhushana, B. R. Prasad, S. Nagesh, Suresh Venkata Nara, D. Sandeep, P. Kamath, Shalab Misra, Bhavana S. Hegde, D. Utkarsha, M. K. Sinha, S. Kathiravan, V. Natarajan, S. P. Kumar, Amit Kumar
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引用次数: 0

摘要

光力学的主要目标之一是支持所需的大型光学器件,并在运行中保持高动态稳定性。这一要求需要更多的支持,以支持大型光学器件。在解决这个问题时,安装系统往往会变得非运动学和扭曲光学表面,导致图像质量差。光学表面的畸变会导致表面波前均方根误差增大,从而导致成像质量下降。在此背景下,我们在之前的出版物(Nagabhushana等人,2021)中提出了一个新概念,该概念涉及在光机械界面引入可变形的套管。这些是变形的应用夹紧力,也使所有的自由度(DOF)被逮捕。这也保证了夹持力在轴向自由度被限制到一个最小值。该技术可以在不施加夹持力的情况下实现轴向自由度的控制,减少了光学像差,提高了安装系统的动态稳定性。这是因为可变形的衬套吸收了所有的夹紧力,并且应变对安装没有影响,因此不会导致光学表面变形。采用有限元方法对夹紧力进行了模拟。进一步,本文通过实验对该概念进行了验证和验证。模拟结果与实验结果有较好的相关性。改进的稳定性也观察到额外的约束引入光机械安装没有妥协的波前误差。
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Experimental Validation of a Novel Concept to Reduce Optical Surface Wave Front Errors by Using Deformable Bushes at Opto-Mechanical Interfaces
One of the major objectives of the optomechanics is to support large optics required for the purpose and also to maintain high dynamic stability in operation. This requirement calls for more number of supports, to support large optics. While addressing this issue, the mounting system tends to become non-kinematic and distorts the optical surface and leads to poor image quality. The distorted optical surfaces bring in increased RMS surface wavefront errors which will result in poor image quality. In this context, a new concept is proposed in our previous publication (Nagabhushana et al., 2021) which involves introduction of deformable bushes at the optomechanical interfaces. These are deformed by applied clamping forces and also enabling all degrees of freedom (DOF) to be arrested. This also ensures that the clamping force in axial DOF is limited to a minimal value. This technique enables to arrest of axial DOF without exerting the clamping force on the optomechanical assembly there by reduces optical aberrations and improves the mounting system’s dynamic stability. This is because deformable bushes absorb all the clamping forces and the strain has no impact on the mount and therefore does not lead deformation of the optical surface. The clamping forces are simulated by Finite Element (FE) methods. Further, in this paper, the concept is verified and validated by experiments. The simulation results are observed to be in close correlation with experiment results. Improved stability is also observed by additional constraints introduced to optomechanical mounts with no compromise in wavefront errors.
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来源期刊
Journal of Astronomical Instrumentation
Journal of Astronomical Instrumentation ASTRONOMY & ASTROPHYSICS-
CiteScore
2.30
自引率
7.70%
发文量
19
期刊介绍: The Journal of Astronomical Instrumentation (JAI) publishes papers describing instruments and components being proposed, developed, under construction and in use. JAI also publishes papers that describe facility operations, lessons learned in design, construction, and operation, algorithms and their implementations, and techniques, including calibration, that are fundamental elements of instrumentation. The journal focuses on astronomical instrumentation topics in all wavebands (Radio to Gamma-Ray) and includes the disciplines of Heliophysics, Space Weather, Lunar and Planetary Science, Exoplanet Exploration, and Astroparticle Observation (cosmic rays, cosmic neutrinos, etc.). Concepts, designs, components, algorithms, integrated systems, operations, data archiving techniques and lessons learned applicable but not limited to the following platforms are pertinent to this journal. Example topics are listed below each platform, and it is recognized that many of these topics are relevant to multiple platforms. Relevant platforms include: Ground-based observatories[...] Stratospheric aircraft[...] Balloons and suborbital rockets[...] Space-based observatories and systems[...] Landers and rovers, and other planetary-based instrument concepts[...]
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