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首页> 外文会议>Conference on Instrument Design and Performance for Optical/Infrared Ground-based Telescopes Pt.3, Aug 25-28, 2002, Waikoloa, Hawaii, USA >Design and Performance of a Versatile Penn State near IR Imager and Spectrograph
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Design and Performance of a Versatile Penn State near IR Imager and Spectrograph

机译：近红外成像仪和光谱仪的多功能宾夕法尼亚州状态的设计和性能

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摘要

A versatile near IR instrument called Penn State near IR Imager and Spectrograph (PIRIS) with a 256x256 PICNIC IR array has been developed at Penn State and saw its first light at the Mt. Wilson 100inch in October 2001. The optical design consists of five optical subsystems including (1) the slit aperture wheel, (2) an achromat collimator optic, (3) a grism/filter and pupil assembly, (4) a pupil imaging optic, and (5) achromat camera optics. This instrument has imaging, spectroscopy and coronagraph modes. It is being updated to have an integral field 3-D imaging spectroscopy mode and a very high IR spectroscopy mode (R ～ 150,000) with an anamorphic silicon immersion grating in 2003. The instrument is designed to take full advantage of high Strehl ratio images delivered by high order adaptive optics systems. Its imaging mode has f/37 and f/51 optics to allow diffraction-limited imaging in H and K bands, respectively. Its spectroscopy mode has R = 20, 180, 400, 2000, and 5000. The lowest resolution is obtained with a non-deviation prism. The medium resolution spectroscopy mode is conducted with three commercial fused-silica grisms. They can be either used in long slit spectroscopy mode with a blocking filter or used as a cross-disperser for a high resolution silicon grism. High resolution spectroscopy is done with silicon grisms and cross-disperser grisms, which are designed to work on high orders (～ 80) to completely cover H and K bands for R = 5000 separately, or simultaneously cover H and K bands for R = 2000. Coronagraphy is done by inserting an apodizing mask, held in the slit aperture wheel, in the focal plane and a Lyot stop (pupil mask) at a reimaged pupil inside the dewar. Image contrast can be enhanced by using different combinations of the apodizing mask and pupil mask. Several of Gaussian pupil masks have also been installed in the pupil wheel for high contrast imaging. We have successfully detected two substellar companions during our first light at Mt. Wilson 100 inch telescope. We were also able to evaluate our cononagraphy and gaussion pupil mask modes, which demonstrate 10~(-3)-10~(-4) contrast 1 arcsec region around a bright point source. A hybrid coronagraph mode, a combination of an apodizing focal plane mask with a Gaussian shaped pupil mask, has been tested and produces 10~(-5) - 10~(-6) deep contrast as close as 4 λ/D at 2.2 um in the lab. Low resolution spectroscopy modes including a vision prism (R = 20) and three fused silicon grisms (R = 200 - 400) have been tested in the lab. The spectroscopy results are reported here.
机译：宾夕法尼亚州已开发出一种多功能的近红外仪器，称为Penn State近红外成像仪和光谱仪（PIRIS），具有256x256 PICNIC IR阵列，并在Mt.威尔逊（Wilson）100英寸（2001年10月）。光学设计包括五个光学子系统，其中包括（1）狭缝光阑轮，（2）消色差准直仪光学器件，（3）棱镜/滤光片和瞳孔组件，（4）瞳孔成像光学器件， （5）消色差相机光学元件。该仪器具有成像，光谱和日冕仪模式。 2003年将其更新为具有积分场3-D成像光谱模式和具有变形硅浸没光栅的非常高的IR光谱模式（R〜150,000）。该仪器旨在充分利用所提供的高Strehl比图像通过高阶自适应光学系统。其成像模式具有f / 37和f / 51光学元件，分别允许在H和K波段进行衍射限制成像。其光谱模式为R = 20、180、400、2000和5000。使用非偏转棱镜可获得最低分辨率。中分辨率光谱模式是使用三种商业化的熔融石英研磨进行的。它们既可以与带有阻挡滤光片的长缝光谱模式一起使用，也可以作为交叉分散器用于高分辨率硅研磨。高分辨率光谱学是通过硅磨和交叉分散磨来完成的，它们设计用于高阶（〜80），以完全覆盖R = 5000的H和K波段，或同时覆盖R = 2000的H和K波段。冠状动脉造影术是通过在焦平面中插入一个固定在狭缝光阑轮中的变迹掩模和一个在杜瓦瓶内重新成像的瞳孔处的Lyot光阑（瞳孔掩模）来完成的。通过使用变迹蒙版和瞳孔蒙版的不同组合可以增强图像对比度。多个高斯瞳孔掩模也已安装在瞳孔轮中，用于高对比度成像。在首次亮相山时，我们已经成功地发现了两个星下同伴。威尔逊100英寸望远镜。我们还能够评估我们的电晕和高斯瞳孔遮罩模式，这些模式演示了亮点光源周围10〜（-3）-10〜（-4）对比度1 arcsec区域。已经测试了混合日冕仪模式，将变迹焦平面掩模与高斯形状​​的瞳孔掩模结合使用，并在2.2 um时产生接近4λ/ D的10〜（-5）-10〜（-6）深度对比度。在实验室里。在实验室中已经测试了低分辨率光谱模式，包括视觉棱镜（R = 20）和三个熔融硅晶格（R = 200-400）。光谱结果报告在这里。

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