Mechanical aspects of near infrared imager spectrometer and polarimeter

Ground-based and Airborne Instrumentation for Astronomy VIII Pub Date : 2020-12-13 DOI:10.1117/12.2561339

P. Kasarla, P. S. Patwal, H. L. Adalja, S. N. Mathur, D. Sarkar, A. Singh, A. Rai, P. Prajapati, S. Naik, Amish B. Shah, S. Ganesh, Kiran S. Baliyan Physical Research Laboratory, Ahmedabad, India., Indian Institute of Technology, Gandhinagar

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Abstract

Near-infrared Imager Spectrometer and Polarimeter (NISP) is a camera, an intermediate resolution spectrograph and an imaging polarimeter being developed for upcoming 2.5m telescope of Physical Research Laboratory at Mount Abu, India. NISP is designed to work in the Near-IR (0.8-2.5 micron) using a H2RG detector. Collimator and camera lenses would transfer the image from the focal plane of the telescope to the detector plane. The entire optics, mechanical support structures, detector-SIDECAR assembly will be cooled to cryo-temperatures using an open cycle Liquid Nitrogen tank inside a vacuum Dewar. GFRP support structures would be used to isolate cryogenic system from the Dewar. Two layer thermal shielding would be used to reduce the radiative heat transfer. Molecular sieve (getter) would be used to enhance the vacuum level inside Dewar. Magnet-reedswitch combination are used for absolute positioning of filterwheels. Here we describe the mechanical aspects in detail.

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近红外成像仪、光谱仪和偏振仪的机械方面

近红外成像仪和偏振计(NISP)是一种照相机、中等分辨率光谱仪和成像偏振计，正在为印度阿布山物理研究实验室即将推出的2.5米望远镜开发。NISP设计用于近红外(0.8-2.5微米)，使用H2RG探测器。准直器和照相机镜头将把望远镜焦平面上的图像传送到探测平面上。整个光学系统、机械支撑结构、探测器- sidecar组件将使用真空杜瓦瓶内的开放式循环液氮罐冷却到低温。玻璃钢支撑结构将用于隔离低温系统与杜瓦瓶。采用两层热屏蔽来减少辐射传热。采用分子筛(吸气器)来提高杜瓦瓶内部的真空度。滤轮的绝对定位采用磁-簧-开关组合。在这里，我们详细描述机械方面。

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Ground-based and Airborne Instrumentation for Astronomy VIII

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