摘要
针对云南天文台１．２ｍ望远镜上的６１单元高分辨率自适应光学系统，进行了微光工作环境下波前传感器子孔径数和信标亮度匹配的实验研究。在ＨａｒｔｍａｎｎＳｈａｃｋ波前传感器前的平行光路加入一个变倍光学系统，进行了８×８、６×６、４×４和２×２子孔径阵列在不同信标亮度下波前传感器对波前的探测实验。实验结果表明，在弱光工作条件下，ＨａｒｔｍａｎｎＳｈａｃｋ波前传感器子孔径数和信标亮度的匹配，有助于提高波前传感器的信噪比，使得自适应光学系统在极弱光环境下仍能校正低阶象差。
In view of the 61 element high resolution adaptive optical system designed for 1.2m telescope at Yunnan Observatory,the experimental investigations for the match of subaperture number of wavefront sensor and beacon brightness under the different low light levels were carried out.The detection experiments of the wavefront by the wavefront sensor with 8×8,6×6,4×4 and 2×2 subaperture arrays under the different beacon brightness were carried out by adding a variable power optical system into the parallel light path of the Hartmann Shack wavefront sensor.The experimental results show that under the conditions of low light level the match of the subaperture number of a Hartmann Shack wavefront sensor with beacon brightness is beneficial to the improvement of the signal to noise ratio of a wavefront sensor,and the low order aberration of an adaptive optical system can still be corrected under the conditions of the extreme low light level,thus the corrected star magnitude of an adaptive optical system can be improved.
出处
《光电工程》
CAS
CSCD
1998年第6期28-31,共4页
Opto-Electronic Engineering
