摘要
以自适应塑远镜技术中应用最广的哈特曼(Hartmsnn)型波前传感器为例,利用光子计数技术对单孔径望远镜在光子噪声受限条件下所能探测到的目标星等极限、探测灵敏度极限以及探测速率极限等基本问题作了实验和理论研究。结果表明,利用文中所述的刀口式哈特曼波前传感器,在光子噪声受限条件下,在1ms探测时间内,在波前误差探测灵敏度为十分之一波长的情况下,可探测到八等星目标。为了在光子计数技术基础上准确标定实验目标的星等,研究分析了进入波前传感器的光通量与探测到的对应光电子通量之间的关系,给出了计算模式、计算机模拟结果和实验结果。
In adaptive optics the wavefront sensor is one of the key components . It must be able to detect the wavefront distortion caused by air turbulence within the photon noise limitation and in a few milliseconds of time. Because of that, the stars or space objects under observation usually are very feint and the time frequency of air turbulence is as high as 1000 Hz . An experimental study on the Hartmann type wavefront sensor based on photon counting technique has been carried out. The experimental results show that a wavefront distortion detection sensitivity of A/10 has been reached for space objects with 8th astronomical magnitude within 1 ms. An algorithm and computer program related to the luminous flux and to the photoelectron rates for wavefront sensors have also been established and verified by experiments .
出处
《北京理工大学学报》
EI
CAS
CSCD
1990年第2期30-36,共7页
Transactions of Beijing Institute of Technology
关键词
波前传感器
自适应光学
光子计数
photon statistics / adaptive optics , wavefront sensor , photon counting
