电讯天线转换成射电望远镜:卡塞格伦天线光学和碟形表面质量的激光扫描测量

IF 1.5 Q3 ASTRONOMY & ASTROPHYSICS Journal of Astronomical Instrumentation Pub Date : 2019-09-10 DOI:10.1142/S2251171719500107
A. Rasha, T. Natusch, C. Granet, S. Gulyaev
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引用次数: 1

摘要

一些国家已经确定了冗余的大型电信天线(TA),并表示打算将它们改造成射电望远镜(RT)。由于抛物面天线射电望远镜的效率取决于其表面质量和光学对准,因此在转换之前应仔细评估这些特性。在这里,作为一个案例研究,我们描述了我们开发并用于Warkworth 30[公式:见文本]m Cassegrain天线的激光扫描(LS)程序。为了研究重力引起的天线表面和结构的机械变形,我们在仰角范围从6到90度进行了测量。激光扫描仪测量其标称的[公式:见文本]立体环境的能力允许同时研究主反射镜和副反射镜,很容易地允许动态调查望远镜光学的变化,因为高度发生变化。特别是,我们在这里提出的方法允许确定主反射器和副反射器的表面质量,反射器中心之间的位移,它们的相对旋转和焦距变化作为仰角的函数。我们讨论了设置,测量,数据处理和分析的细节,重点是可能的困难和陷阱。在我们的案例研究中,没有观察到反射器表面明显的仰角变形,随着仰角从90°到6°的变化,拟合后残差的总体标准差分别在1.0到1.7毫米之间。因此,我们得出结论,在我们的情况下,主反射镜和副反射镜以及望远镜光学系统在测量精度范围内都不受引力变形的影响,这一结论可能延伸到目前考虑转换的类似TA类。
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Conversion of a Telecommunications Antenna into a Radio Telescope: Laser Scanner Measurements of Optics and Dish Surface Quality of a Cassegrain Antenna
A number of countries have identified redundant large telecommunications antennas (TA) and indicated their intention to convert them into radio telescopes (RT). As the efficiency of a parabolic dish radio telescope depends on its surface quality and optical alignment, a careful assessment of these properties should be undertaken before conversion. Here, as a case study, we describe a laser scanning (LS) procedure we developed and used for the Warkworth 30[Formula: see text]m Cassegrain antenna. To investigate gravity-induced mechanical deformation of the antenna surfaces and structure, we conducted measurements at elevation angles ranging from 6 to 90 degrees. The ability of a laser scanner to survey its nominal [Formula: see text] steradian surroundings allows for simultaneous study of the main and subreflectors, readily permitting a dynamic investigation of variation of the telescope optics as elevation changes occur. In particular, the method we present here allows determination of the surface quality of both main and subreflectors, the displacement between centers of the reflectors, their relative rotations and focal length variation as a function of elevation angle. We discuss details of settings, measurements, data processing and analysis focusing on possible difficulties and pitfalls. In our case study, no significant elevation-dependent surface deformation of the reflectors was observed, with the overall standard deviation of the postfit residuals varying between 1.0 and 1.7[Formula: see text]mm as elevation angle changes from 90∘ to 6∘, respectively. We, therefore, conclude that in our case both the main reflector and the subreflector, as well as the telescope optics, remain unaffected by gravitational deformation within the accuracy of the measurements, a conclusion that can possibly be extended to the similar class of TA currently considered for conversion.
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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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