用于SOAR望远镜的巴西可调滤波成像器
The Brazilian Tunable Filter Imager for the SOAR telescope
摘要：
本文介绍了一种用于SOAR望远镜的新型可调谐滤波器。巴西可调滤光成像仪是一种多功能、新技术的可调光学成像仪，将使用SOAR望远镜的SAM地面层自适应光学设施，用于视限模式和更高的空间保真度。该仪器为SOAR社区开辟了重要的新科学能力，从研究附近星系和星际介质的中心到统计宇宙学调查。BTFI利用了三项新技术。成像布拉格可调谐滤波器概念利用双通配置中的体相位全息光栅作为可调谐滤波器，而新的法布里-珀罗（FP）概念涉及允许单个FP标准具在大范围的干涉阶数和光谱分辨率上起作用的技术。这两种技术将在同一仪器中使用。通过在低分辨率下使用iBTF和扫描超过R ~ 2，000的FP，可以实现跨越25和30，000之间的范围的光谱分辨率。BTFI的第三项新技术是使用EMCCD进行快速和周期性波长扫描，从而通过数据采集减轻大气变化的破坏性影响。该仪器的另一个重要特征是它有两个光学通道，可以同时记录窄带滤波图像和剩余的（互补的）宽带光。这避免了使用单个检测器的可调谐滤波器成像中固有的不确定性。该系统被设计为提供可调滤波器成像，其一侧的视场为3弧分，以0.12”采样，用于直接Nasmyth可见受限区域光谱学和SAM的访客仪器端口，用于GLAO馈送区域光谱学。该仪器已经看到了第一个光，作为一个SOAR游客仪器。目前处于调试阶段。
英文摘要：
This paper presents a new Tunable Filter Instrument for the SOAR telescope. The Brazilian Tunable Filter Imager (BTFI) is a versatile, new technology, tunable optical imager to be used in seeing-limited mode and at higher spatial fidelity using the SAM Ground-Layer Adaptive Optics facility at the SOAR telescope. The instrument opens important new science capabilities for the SOAR community, from studies of the centers of nearby galaxies and the insterstellar medium to statistical cosmological investigations. The BTFI takes advantage of three new technologies. The imaging Bragg Tunable Filter concept utilizes Volume Phase Holographic Gratings in a double-pass configuration, as a tunable filter, while a new Fabry-Perot (FP) concept involves technologies which allow a single FP etalon to act over a large range of interference orders and spectral resolutions. Both technologies will be in the same instrument. Spectral resolutions spanning the range between 25 and 30,000 can be achieved through the use of iBTF at low resolution and scanning FPs beyond R ~2,000. The third new technologies in BTFI is the use of EMCCDs for rapid and cyclically wavelength scanning thus mitigating the damaging effect of atmospheric variability through data acquisition. An additional important feature of the instrument is that it has two optical channels which allow for the simultaneous recording of the narrow-band, filtered image with the remaining (complementary) broad-band light. This avoids the uncertainties inherent in tunable filter imaging using a single detector. The system was designed to supply tunable filter imaging with a field-of-view of 3 arcmin on a side, sampled at 0.12" for direct Nasmyth seeing-limited area spectroscopy and for SAM's visitor instrument port for GLAO-fed area spectroscopy. The instrument has seen first light, as a SOAR visitor instrument. It is now in comissioning phase.
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