一种简易小型化恒星干涉仪：用掩膜望远镜测量金星的角直径
A Simple Miniaturized Stellar Interferometer: Measuring the Angular Diameter of Venus with a Masked Telescope
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中文总结 AI 辅助
本文提出一种简易小型化恒星干涉仪，利用带双孔掩膜的望远镜测量金星角直径，类比1921年迈克尔逊-皮斯实验，提供直观教学演示。
中文摘要 AI 辅助
我们描述了一个简单且视觉上引人入胜的天文干涉测量演示/实验，使用标准行星望远镜和一块打有两个小孔的不透明薄塑料片。通过观察随着孔间距增加干涉条纹的消失，学生可以直接估算金星的角直径。该演示是1921年迈克尔逊-皮斯测量参宿四这一里程碑式实验的桌面类比，并自然地从该测量中缩放：迈克尔逊和皮斯需要6.1米基线来分辨直径47毫角秒（mas）的圆盘，而15毫米基线就足以分辨金星，当金星角直径约为10-15角秒（''）时。该实验在普通大气视宁度条件下可靠工作，将金星（或木星）与天狼星等亮星并排比较，可以直观地展示扩展源和点源之间的差异。它同样适用于不同难度水平的实验教学。此外，它不需要光学望远镜方面的高级知识或技能。虽然基本思想是众所周知的，但我们不知道有任何来源以易于理解、统一的形式呈现它们。
英文摘要
We describe a simple, visually compelling demonstration/laboratory of astronomical interferometry using a standard planetary telescope and a thin piece of opaque plastic punched with two small holes. By observing the disappearance of interference fringes as the hole spacing is increased, students can directly estimate the angular diameter of Venus. The demonstration is a tabletop analogue of the landmark 1921 Michelson-Pease measurement of Betelgeuse and scales naturally from that measurement: where Michelson and Pease required a 6.1 m baseline to resolve a disk 47 mas (milli-arcsecond) across, a 15 mm baseline suffices for Venus, when it is approximately 10-15$''$ (arc seconds). The lab works reliably in ordinary atmospheric seeing conditions, and a side-by-side comparison of Venus (or Jupiter) with a bright star such as Sirius provides an immediate visual demonstration of the difference between extended and point sources. It works equally well as a laboratory at a variety of difficulty levels. Furthermore, it does not require advanced knowledge or skills with optical telescopes. While the underlying ideas are well known, we are unaware of any source that presents them in an accessible, unified form.
发表机构
- Sonoma State University（索诺玛州立大学）
机构由 AI 辅助整理，请以论文原文为准。
