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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。
Taking the most widely used Hartmsnn wavefront sensor in the adaptive telescope technology as an example, the limit of the target magnitudes of the single-aperture telescopes can be detected under photon-noise-limited conditions using photon counting technique. Detection sensitivity limit and detection rate limit and other basic issues made experimental and theoretical research. The results show that with the knife-edge Hartmann wavefront sensor described in this paper, under the condition of photon noise limitation, under the detection time of 1ms and the wavefront error detection sensitivity of one tenth wavelength, Eight star target. In order to accurately calibrate the magnitude of the experimental target on the basis of the photon counting technique, the relationship between the luminous flux entering the wavefront sensor and the corresponding photoelectron flux detected is analyzed, and the calculation mode, computer simulation results and experimental results are given.