基于OMR的2．16米望远镜积分视场单元方案

基于积分视场单元的三维成像光谱技术日趋成熟，并且与传统的狭缝光谱仪相比有许多明显的优势。2．16m望远镜的OMR光谱仪是采用平面光栅分光的低色散卡焦光谱仪器，可以考虑对其进行积分视场单元的升级优化。在不改变OMR光谱仪自身结构，不影响现有功能的同时，利用“微透镜阵列＋光纤束”的技术可以实现积分视场单元与OMR光谱仪的耦合。设计了两种方案，给出了升级积分视场单元后的空间分辨率和视场。

A Design of OMR-IFU for the 2.16m Telescope of NAOC

With the development of telescope technologies, e. g., the increase of telescope apertures and the application of adaptive optics, astronomical instruments can obtain images of higher Signal-to-Noise Ratios （SNR） in both wavelength and spatial domains. An Integral Field Spectrograph （IFS） equipped with an Integral Field Unit（IFU） has several obvious advantages in comparison with traditional slit spectrographs for certain astrophysical research fields, such as those of dense star clusters, supernova remnants, nebulae, cores of nearby galaxies, and other extended celestial objects. An OMR low-dispersion slit spectrograph on the Cassegrain focal-plane, which has been equipped on the 2.16m telescope at the Xinglong Station, National Astronomical Observatories of China （NAOC） since 1995, can be upgraded to an IFS by adopting a ＂lenticules＋fibers＂ array without changing configuration. To reduce the cost, we use existing products, such as the fibers from the Polymicro Technologies Inc. and arrays of lenticules from the Adaptive Optics Associates Inc. The slit of the OMR is not rely long （28.8mm, or 5.1）, so we cannot set many IFU sampling units. The IFU consists of a fore-optics system, an array of lenticules, fibers, and output microlenses. Two different IFU upgrade plans are discussed in this paper. The first has a spatial sampling scale of 1＂ and a field of view of 8＂x 8＂, while the second has a wider field of view （27＂x31.5＂） but lower spatial resolution （4.5＂）. Because of the unchanged configuration, the new IFU will have no effect on the original function of the OMR The IFU will be an experimental equipment. We such as stellar kinematics in the co：res of nearby expect it to meet the demands of some astronomical research, galaxies, the structures of nebulae and supernova remnants, circumnuclear environments in active galactic nuclei, equipment for astronomers on the 2.16m telescope. etc. After completion, it can be used as a routine