摘要
近年来,三维成像光谱技术主要是发展和采用积分视场单元方法,即将视场内的展源目标连续切割成若干单元,重新排列后进入光谱仪器,同时获得展源的高分辨率三维数据立方体(x,y和λ)。相对于传统的技术方法,这种基于积分视场单元的三维成像光谱技术进行一次观测可以同时获取天体各处的二维空间信息和光谱信息。采用积分视场单元虽然在光谱数据处理上会带来很多困难,但由于其在观测时间和效率上具有明显的优点,因此值得采用。该文简要介绍了三维成像光谱技术的原理;评述了目前实现三维成像光谱的三种不同类型的技术系统:小透镜阵系统、光纤加小透镜阵系统、像切分器系统,重点介绍了像切分器系统的有关情况;最后展望了三维成像光谱技术在天文学上的应用。
There are lots of techniques to obtain spectrum of extended celestial objects on a 2D field from which scientific advantages are obvious. Traditional techniques like scanning slit spectroscopy, multiple slit spectroscopy and Fabry-Perot spectroscopy could do it in rather limited cases. Much more observing time is necessary in order to obtain spatial resolution over two directions. Spectral coverage and resolution are both strictly limited. Nowadays the focus of 3D imaging spectroscopy has been on the integral field spectroscopy which samples the 2D field by an array of sub-apertures. The technique facilitates investigating extended objects with larger field size, good 2D spatial resolution and spectral resolution, but with less observing time although with some difficulties brought to data reduction.
This paper gives an overview of various developed integral field technologies. Three basic methods （lenslet array, combination of fibers and lenslet array, image slicing） are described,discussed and compared with each other. Image slicing is a unique technique that retains spatial resolution within each sub-aperture at current time. The types of image-slicers are treated in more detail. Finally, we give a brief view of the application and the development of the integral field unit based on imaging spectroscopy. Future possibilities of building IFU based 3D imaging spectrograph in China are considered as well.
出处
《天文学进展》
CSCD
北大核心
2008年第1期73-79,共7页
Progress In Astronomy
关键词
三维成像光谱
积分视场单元
像切分器
小透镜阵
three-dimensional imaging spectrograph
integral field unit
image slicer
lenslet array
