Performance testing and end-to-end mapping of the fiber cable on the SALT NIR integral field spectrograph
Performance testing and end-to-end mapping of the fiber cable on the SALT NIR integral field spectrograph
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在 SALT NIR 积分场光谱仪上对光缆进行性能测试和端到端映射
DOI：
10.1117/12.2630176
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Wirag, Briana
中科院分区：
文献类型：
--
作者：
Oppor, Joshua E.;Bershady, Matthew A.;Wolf, Marsha J.;Smith, Michael P.;Chattopadhyay, Sabyasachi;Jaehnig, Kurt P.;Percival, Jeffrey W.;Mulligan, Mark P.;Jurgella, Kathleen M.;Wirag, Briana
为11米南非大型望远镜（SALT）的近红外（NIR）摄谱仪而建造的光纤积分场单元（IFU）已经在威斯康星大学麦迪逊分校天文系的沃什伯恩天文实验室进行了原型设计和严格的性能测试。43米长的256根光纤组成了物体和天空阵列以及备件，它们通过四条单独的电缆从SALT有效载荷向下进入光谱仪室。使用说明书覆盖了344 arcsec 2的天空，物体阵列在大约56%的填充因子下跨越了552 arcsec 2的近矩形区域。配套文件描述了光纤电缆的机械设计，可减轻光纤上的潜在机械应变源（Smith等人）。以及光谱仪的详细信息（Wolf等人）。在这里，我们将展示各种测试电缆的性能测试结果，以及完全组装的科学电缆的性能测试和端到端映射。在操作过程中，光纤在仪器外壳入口处经历极端的温度梯度，温度保持在-40 ° C。我们发现，当在降低的温度下保持逐渐变长的测试光纤长度时，焦比退化（FRD）会增加。然而，我们确认，这种温度依赖的FRD是可以忽略不计的冷光纤的设计长度。我们还发现，破坏室温应变消除盒和冷仪器外壳的橡胶密封件对FRD的贡献可以忽略不计。我们的测量表征性能，包括内部光纤不均匀性的影响，从光纤处理和终止引起的应力，以及任何来自端部抛光的缺陷。我们提供了完全组装的科学电缆的室温实验室性能测量;光纤电缆提供给光谱仪准直器的有效总吞吐量在所有光纤上为81±2.5%，考虑到所有损耗。
The optical fiber integral field unit (IFU) built to feed the near infrared (NIR) spectrograph for the 11-meter Southern African Large Telescope (SALT) has undergone prototyping and rigorous performance testing at Washburn Astronomical Laboratories of the University of Wisconsin-Madison Astronomy Department. The 43 m length of 256 fibers which make up the object and sky arrays and spares are routed from the SALT payload down into the spectrograph room in four separate cables. The IFU covers 344 arcsec2on the sky, with the object array spanning a 552 arcsec2near-rectangular area at roughly 56% fill-factor. Companion papers describe the mechanical design of the fiber cable that mitigates potential sources of mechanical strain on the optical fiber (Smith et al.) and details of the spectrograph (Wolf et al.). Here we present the results of the performance testing of various test cables as well as performance testing and end-to-end mapping of the fully-assembled science cable. The fiber optics experience an extreme temperature gradient at the ingress to the instrument enclosure held at -40 ◦C during operation. We find an increase in focal ratio degradation (FRD) when holding progressively longer lengths of test fiber at reduced temperature. However, we confirm that this temperature dependent FRD is negligible for our designed length of cold fiber. We also find negligible contributions to FRD from the rubber seal that breaches the room temperature strain relief box and the cold instrument enclosure. Our measurements characterize performance including the effects of internal fiber inhomogeneities, stress induced from fiber handling and termination, as well as any imperfections from end-polishing. We present the room-temperature laboratory performance measurements of the fully-assembled science cable; the effective total throughput the fiber cable delivers to the spectrograph collimator is 81±2.5% across all fibers accounting for all losses.
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