Performance of Subaru Cassegrain Adaptive Optics System
Performance of Subaru Cassegrain Adaptive Optics System
复制标题
斯巴鲁卡塞格伦自适应光学系统的性能
DOI：
10.1093/pasj/56.1.225
复制
发表时间：
2004
影响因子：
2.3
通讯作者：
D. Saint
中科院分区：
文献类型：
--
作者：
H. Takami;N. Takato;Y. Hayano;M. Iye;S. Oya;Y. Kamata;T. Kanzawa;Y. Minowa;M. Otsubo;Koji Nakashima;W. Gaessler;D. Saint
本文报道了8.2米斯巴鲁望远镜卡塞格伦自适应光学系统的设计和性能。该系统是基于一个曲率波前传感器与36个光子计数雪崩光电二极管模块和一个双压电晶片波前校正变形镜与36个驱动电极。2000年12月，AO系统的工程首次亮相。自2002年4月以来，AO系统一直在为两个开放式仪器服务，一个是红外相机和摄谱仪，另一个是具有自适应光学的日冕成像仪。K波段的斯特列尔比在0.3左右，明亮的导星在0以下。�� 4 K波段视情况。控制回路每秒执行2060次校正。波前传感器的高灵敏度可以显着提高图像质量，即使对于低至R = 18等的微弱引导星也是如此。通过测量球状星团中恒星图像的半高宽来估算等晕角，发现在距引导星星30 °的范围内，半高宽几乎保持不变，表明该夜的有效湍流层高度小于1.8 km。正在进行的升级计划，增加五倍的控制元件的数量和安装激光制导AO系统进行了说明。
The design and performance of the Cassegrain Adaptive Optics (AO) system for the 8.2m Subaru Telescope are reported. The system is based on a curvature wavefront sensor with 36 photon-counting avalanche photodiode modules and a bimorph wavefront correcting deformable mirror with 36 driving electrodes. The engineering first light of the AO system took place in 2000 December. The AO system has been in service since 2002 April for two open-use instruments, an infrared camera and spectrograph and a coronagraph imager with adaptive optics. The Strehl ratio in the K-band is around 0.3 for bright guide stars under 0. �� 4 K-band seeing condition. The control loop performs with 2060 corrections per second. High sensitivity of the wavefront sensor allows significant improvement in the image quality, even for faint guide stars down to R = 18mag. The FWHM of stellar images in a globular cluster was measured to derive an estimation of the isoplanatic angle and was found nearly constant out to 30 �� from the guide star, indicating that the height of the effective turbulent layer of that particular night was less than 1.8km. The on-going upgrade plans for a fivefold increase in the number of control elements and for the installation of a laser guide AO system are described.