Oral Presentation

Experimental study on the effects of atmospheric turbulence on co-phase error detection.

Author(s):

Presenter: Bin Wang (中国科学院云南天文台)

The segmented mirror active optical technology is the key to achieving high spatial resolution in large-aperture astronomical telescopes. High-precision co-phase error detection is an important factor in determining the co-phase maintenance of the primary mirror. However, the presence of atmospheric turbulence can cause a decrease in the accuracy of co-phase error detection based on the observation target. In order to pursue high-precision co-phase error error detection, research has been conducted on the impact of atmospheric turbulence on optical co-phase error detection. Effective methods for suppressing atmospheric turbulence have been identified based on simulation results: the detection area size should be smaller than the atmospheric coherence length and long exposure times should be used. Co-phase error detection experiments were conducted in a segmented mirror system under simulated turbulent conditions of varying intensity. When the detection area size was no larger than the atmospheric coherence length and the exposure time was not less than 40ms, the detection accuracy was close to that without turbulence, at approximately 5 nm. The experimental results demonstrate that, under conditions of good atmospheric seeing, optical detection methods can meet the co-phase error detection requirements in complex environments by setting appropriate detection area sizes and exposure times.