Improved design and prototyping for a 10/20-um camera/spectrometer for ESO's VLT
Improved design and prototyping for a 10/20-um camera/spectrometer for ESO's VLT
复制标题
改进了 ESO VLT 的 10/20 微米相机/光谱仪的设计和原型设计
DOI：
10.1117/12.176795
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
B. Delabre
中科院分区：
文献类型：
--
作者：
H. Kaeufl;B. Delabre
ESO VLT第二单元望远镜的卡塞格伦焦点应配备10/20微米照相分光计。该仪器应由欧洲南方天文台成员国的研究所组成的财团负责最终设计。仍然需要相当详细的内部研究来评估工作的总体范围，对望远镜设计的影响以及ESO所需的基础设施。内部研究已经导致多模仪器允许在10/20微米的可变放大率下的衍射限制成像，低、中加上潜在的高分辨率长狭缝光谱（接近或超过（λ）除以（Delta）（λ）约等于50000）。光学设计允许利用探测器领域的快速发展。新颖的设计特点是一个可更换的入口窗口，变形光束扩展和潜在的使用浸没光栅。在拉西拉天文台TIMMI，一台用于3.6米望远镜的小型10微米照相机/分光计（由法国萨克莱CEN天体物理服务处建造）正在运行，使欧洲南方天文台及其社区能够获得10微米大气窗口的天文学实践经验。该仪器目前配备有64 x64元素Ga：Si阵列。法国格勒诺布尔的Leti/LIR目前正在开发一个128 x196单元的阵列，该阵列可用于提升欧洲南方天文台目前的观测能力。TIMMI中的光谱学利用通过各向异性蚀刻加工的锗光栅。这种制造技术还可以用于从高折射率材料制造浸没光栅。
The Cassegrain focus of the 2nd unit telescope of ESO's VLT shall be equipped with a 10/20 micrometers camera spectrometer. This instrument shall be built by a consortium of institutes from ESO's member-states responsible for the final design. Still rather detailed internal studies were required to assess the overall scope of work, the repercussions on the telescope design and the required infrastructure at ESO. The internal studies have resulted in a multimode instrument allowing for diffraction limited imaging with variable magnification at 10/20 micrometers , low-, medium- plus potentially high-resolution long slit spectroscopy (approaching or exceeding (lambda) divided by (Delta) (lambda) approximately equals 50000). The optical design allows to take advantage of the rapid evolution in the field of detectors. Novel design features are an exchangeable entrance window, an anamorphic beam expansion and potentially the use of immersion gratings. At the La Silla observatory TIMMI, a small 10 micrometers camera/spectrometer for the 3.6 m telescope (built by the Service d'Astrophysique, CEN- Saclay, France) is in operation to allow both ESO and its community to gain practical experience in astronomy in the 10 micrometers atmospheric window. This instrument is currently equipped with a 64x64 element Ga:Si array. A 128x196 element array is presently in development at Leti/LIR of Grenoble, France, which may be used to upgrade ESO's current observing capabilities. Spectroscopy in TIMMI utilizes Germanium grisms machined via anisotropic etching. This manufacturing technology may also serve to fabricate immersion gratings from high index materials.