arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.10902astro-ph.IM
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天文摄谱仪中光纤定位器操作的焦比退化

Focal ratio degradation for fiber positioner operation in astronomical spectrographs

Brent Belland, James Gunn, Dan Reiley, Judith Cohen, Evan Kirby, Antonio Cesar de Oliveira, Ligia Souza de Oliveira, Mitsuko Roberts, Michael Seiffert

摘要:

焦比退化(FRD)是光纤输入端和输出端之间光焦比的增加,它对天文摄谱仪的吞吐量和点扩散函数有重要影响。然而,虽然FRD是许多光纤特性的函数,例如应力、微弯曲和表面缺陷,但入射光与光纤表面之间的角度不对准也会影响光分布并使测量复杂化。一个紧凑的实验装置和一个模型分离FRD从角度失调被施加到光纤受到不同的应力或角度失调,以确定这些影响的大小。然后确定光纤定位器中光纤的FRD,该光纤定位器将用于Subaru Prime Focus摄谱仪(PFS)。我们对PFS定位器进行的分析表明,角偏差的影响占主导地位,应力不会导致FRD显著增加。

英文摘要:

Focal ratio degradation (FRD), the increase of light's focal ratio between the input into an optical fiber and the output, is important to characterize for astronomical spectrographs due to its effects on throughput and the point spread function. However, while FRD is a function of many fiber properties such as stresses, microbending, and surface imperfections, angular misalignments between the incoming light and the face of the fiber also affect the light profile and complicate this measurement. A compact experimental setup and a model separating FRD from angular misalignment was applied to a fiber subjected to varying stresses or angular misalignments to determine the magnitude of these effects. The FRD was then determined for a fiber in a fiber positioner that will be used in the Subaru Prime Focus Spectrograph (PFS). The analysis we carried out for the PFS positioner suggests that effects of angular misalignment dominate and no significant FRD increase due to stress should occur.

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