SparsePak: A Formatted Fiber Field Unit for the WIYN Telescope Bench Spectrograph. I. Design, Construction, and Calibration
SparsePak: A Formatted Fiber Field Unit for the WIYN Telescope Bench Spectrograph. I. Design, Construction, and Calibration
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DOI：
10.1086/421057
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发表时间：
2004-03
影响因子：
3.5
通讯作者：
M. Bershady;D. Andersen;J. Harker;Larry W. Ramsey;M. Verheijen
中科院分区：
文献类型：
--
作者：
M. Bershady;D. Andersen;J. Harker;Larry W. Ramsey;M. Verheijen
我们描述了格式化光纤场单元SparsePak的设计和构造，并对其光学和天体测量性能进行了表征。该阵列针对可见光和近红外低表面亮度扩展光源的光谱进行了优化。SparsePak包含82，4“7根纤维，覆盖了望远镜焦平面上72”×71“的面积，并提供给WIYN工作台光谱仪。这些仪器加在一起，能够达到λ/Δλ∼20,000的光谱分辨率和每根光纤的∼140弧秒2平方米的面体角度积。SparsePak的实验室测量得出了几个关于光纤终端和光缆曲率设计的重要结论，以最大限度地减少焦比劣化。SparsePak本身的吞吐量超过80%的Redward 5200ä和90%-92%的Red。FED为f/6.3，电缆在接近f/5.2的情况下提供90%的环绕能量输出。如果WIYN BASE光谱仪有一个更快的准直器，这就意味着性能的提高。我们的积分场光谱学方法产生了一种简单和廉价的仪器，但在现有的任何系统中，每种光谱产生的面积-固体角度积是最高的。附录详细说明了制造过程，供其他人重复。SparsePak得到了国家科学基金会和威斯康星大学麦迪逊分校研究生院的资助，现在可以通过国家光学天文台在WIYN望远镜上公开使用。
We describe the design and construction of a formatted fiber field unit, SparsePak, and characterize its optical and astrometric performance. This array is optimized for spectroscopy of low surface brightness extended sources in the visible and near‐infrared. SparsePak contains 82, 4 .″7 fibers subtending an area of 72′′ × 71′′ in the telescope focal plane and feeds the WIYN Bench Spectrograph. Together, these instruments are capable of achieving spectral resolutions of λ/Δλ∼20,000 and an area–solid angle product of ∼140 arcsec2 m2 per fiber. Laboratory measurements of SparsePak lead to several important conclusions on the design of fiber termination and cable curvature to minimize focal ratio degradation. SparsePak itself has throughput above 80% redward of 5200 Å and 90%–92% in the red. Fed at f/6.3, the cable delivers an output of 90% encircled energy at nearly f/5.2. This has implications for performance gains if the WIYN Bench Spectrograph were to have a faster collimator. Our approach to integral‐field spectroscopy yields an instrument that is simple and inexpensive to build, yet yields the highest area–solid angle product per spectrum of any system in existence. An Appendix details the fabrication process in sufficient detail for others to repeat. SparsePak was funded by the National Science Foundation and the University of Wisconsin‐Madison Graduate School, and is now publicly available on the WIYN Telescope through the National Optical Astronomical Observatories.