建造经济实惠的大型光学近红外望远镜(I):处理分段式主镜的另一种方法

IF 2.7 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Radhika Dharmadhikari, Padmakar Parihar, Annu Jacob
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引用次数: 0

摘要

创新理念和最新技术的应用无疑大大降低了望远镜的成本。然而,仍有一些方法可以进一步降低光学地基望远镜的成本,使更多更广泛的天文团体能够负担得起。在这篇论文和随后的论文中,我们将介绍我们为建造 4.0-6.0 米大小的可负担得起的中型望远镜而开展的研究。在当今时代,分段镜技术已成为建造中大型望远镜的首选。在任何分段镜望远镜(SMT)中,最重要的部分是其主镜控制系统(M1CS)。传统的 M1CS 基于边缘传感器和执行器,但这样的系统会带来许多设计和实现上的复杂性。在本文中,我们建议使用离轴对准和相位调节系统(OAPS),这是一种实时工作的主动式主镜控制系统,可以在不使用边缘传感器的情况下保持分段主镜的形状。对齐和相位调节系统是任何分段望远镜不可分割的一部分,可在离轴位置实时使用。通过大量模拟,我们探索了使用 OAPS 对分段镜望远镜进行共同对准、共同聚焦和共同相位的可行性。通过模拟,我们发现可以用一颗暗至 16-18(^{th}\) 等的引导星来实现分段的共同对准和共同聚焦。这意味着,无需使用复杂的边缘传感器控制系统,任何分段式望远镜都可以轻松实现有限的视差性能。而要达到衍射受限的性能,镜片需要以几十纳米的精度共相位。在我们的模拟中,我们使用了一种基于分散条纹传感器的相位方案,它可以有效地工作到14(^{th}\)等的导引星。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Building a large affordable optical-NIR telescope (I): an alternate way to handle segmented primary mirror

Building a large affordable optical-NIR telescope (I): an alternate way to handle segmented primary mirror

Building a large affordable optical-NIR telescope (I): an alternate way to handle segmented primary mirror

The use of innovative ideas and the latest technology have undoubtedly brought down telescope costs substantially. However, there are still ways to further reduce the cost of optical ground-based telescopes and make them affordable to much larger and wide spread astronomical communities. In this and subsequent papers we are presenting our studies carried out towards building affordable mid-size telescopes of 4.0-6.0m in size. In the present era, segmented mirror technology has become the first choice for building moderate to large-size telescopes. In any Segmented Mirror Telescope (SMT) the most important part is its primary mirror control system (M1CS). The conventional M1CS is based on edge sensors and actuators, but such a system introduces many design and implementation complexities. In this paper, we propose to make use of an Off-axis Alignment and Phasing System (OAPS), which is an active mirror kind of control system working in real time to maintain the figure of a segmented primary mirror without the use of edge-sensors. The alignment and phasing system which is an integral part of any segmented telescope can be used in the real time at the off-axis. Through extensive simulations we have explored the feasibility of using an OAPS for co-alignment, co-focusing as well as co-phasing of segmented mirror telescopes. From our simulations we find that the co-alignment and co-focusing of the segments can be achieved with a guide star as faint as 16-18\(^{th}\) magnitude. This implies that seeing limited performance for any segmented telescope can be easily accomplished without use of a complex edge sensor based control system. Whereas, to attain diffraction limited performance, mirror segments need to be co-phased with an accuracy of few tens of nanometers. In our simulations we have used a dispersed fringe sensor based phasing scheme, which can effectively work up to guide stars of 14\(^{th}\) magnitude.

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来源期刊
Experimental Astronomy
Experimental Astronomy 地学天文-天文与天体物理
CiteScore
5.30
自引率
3.30%
发文量
57
审稿时长
6-12 weeks
期刊介绍: Many new instruments for observing astronomical objects at a variety of wavelengths have been and are continually being developed. Furthermore, a vast amount of effort is being put into the development of new techniques for data analysis in order to cope with great streams of data collected by these instruments. Experimental Astronomy acts as a medium for the publication of papers of contemporary scientific interest on astrophysical instrumentation and methods necessary for the conduct of astronomy at all wavelength fields. Experimental Astronomy publishes full-length articles, research letters and reviews on developments in detection techniques, instruments, and data analysis and image processing techniques. Occasional special issues are published, giving an in-depth presentation of the instrumentation and/or analysis connected with specific projects, such as satellite experiments or ground-based telescopes, or of specialized techniques.
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