星体目标自适应光学成象补偿

大气湍流等动态波前扰动限制大型望远镜的分辨能力，是从有望远镜以来几百年的老问题，自适应学技术提供了解这一问题的途径。但对星体目标来说由于所能利用的光能极为有限，动态扰动的时间－空间特性又对系统提出很高要求，因而难度很大。本文报导我们用２１单元自适应光学系统在云南天文台１．２ｍ望远镜上对星体目标进行的首次试验。介绍了针对弱光动态目标的特点对系统的改进。实验结果表明了这一自适应光学系统可以在光子计数率

The Compensated Imaging for Stars by Adaptive Optics

The resolution of large telescope is limited by atmospheric turbulence etc dynamic wavefront. This had been a problem since the invention of astronomical telescope. A solving method has been provided by the adaptive optics. But for stars,since their light is limited and the spatial-temporal properties of the dynamic disturbance have put forward high requirements for the adaptive optical system, so the difficulties are large. The first experiment of adaptive optical system with 21-actuator deformable mirror was carried out on 1.2m astronomical telescope in Yunnan Observatory. The improvement for the characteristics of low-light-level object is presented.The experimental results show that the adaptive optical system can operate under the conditions when the photon counting is as low as 95 counts.The system has significant effects in reducing image spot dispersion and wandering ,improving resolution and increasing star image constrast.