Optical aspects of Near-Infrared Imager Spectrometer and Polarimeter instrument (NISP)

Ground-based and Airborne Instrumentation for Astronomy VIII Pub Date : 2020-12-13 DOI:10.1117/12.2560988

A. Rai, S. Ganesh, S. Paul, P. Kasarla, P. Prajapati, D. Sarkar, A. Singh, Pitambar S. Patwal, H. L. Adalja, S. N. Mathur, S. Naik, Amish B. Shah, Kiran S. Baliyan Physical Research Laboratory, Ahmedabad, India., Iit, Gandhinagar, Space Center

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引用次数: 2

Abstract

As a Near-IR instrument to PRL's upcoming 2.5 m telescope, NISP is designed indigeniously at PRL to serve as a multifaceted instrument. Optical, Mechanical and Electronics subsystems are being designed and developed in-house at PRL. It will consist of imaging, spectroscopy and imaging-polarimetry mode in the wavelength bands Y, J, H, Ks i.e. 0.8 - 2.5 micron. The detector is an 2K x 2K H2RG (MCT) array detector from Teledyne, which will give a large FOV of 10' x 10' in the imaging mode. Spectroscopic modes with resolving power of R ~ 3000, will be achieved using grisms. Spectroscopy will be available in single order and a cross-dispersed mode shall be planned for simultaneous spectra. The instrument enables multi-wavelength imaging-polarimetry using Wedged-Double Wollaston (WeDoWo) prisms to get single shot Stokes parameters (I, Q, U) for linear polarisation simultaneously, thus increasing the efficiency of polarisation measurements and reducing observation time.

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近红外成像仪和偏振仪(NISP)的光学方面

作为PRL即将推出的2.5米望远镜的近红外仪器，NISP是PRL自主设计的多面仪器。光学、机械和电子子系统正在PRL内部设计和开发。它将包括在Y, J, H, Ks波段(即0.8 - 2.5微米)的成像，光谱和成像偏振模式。探测器是来自Teledyne的2K x 2K H2RG (MCT)阵列探测器，在成像模式下将提供10' x 10'的大视场。利用光栅可实现分辨率为R ~ 3000的光谱模式。光谱学将以单一顺序提供，并计划为同时光谱提供交叉分散模式。该仪器使用楔形双沃拉斯顿(WeDoWo)棱镜进行多波长成像偏振测量，同时获得线偏振的单镜头Stokes参数(I, Q, U)，从而提高了偏振测量的效率，缩短了观测时间。

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Ground-based and Airborne Instrumentation for Astronomy VIII

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