Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2828..322j&link_type=abstract
Proc. SPIE Vol. 2828, p. 322-331, Image Propagation through the Atmosphere, J. C. Dainty; Luc R. Bissonnette; Eds.
Astronomy and Astrophysics
Astronomy
2
Scientific paper
A 21-element adaptive optical system has been built and installed at the 2.16 m telescope of Beijing Astronomical Observatory (BAO). It consists of a pair of photon counting shearing interferometers, a 21-element deformable mirror, a fast steering mirror, a digital processor and an imaging CCD camera. The wavefront error sensing is in the visible wavelength and the compensated images are detected in infrared band. In this paper, the system and its preliminary observation results are briefly reported. Moreover, the closed-loop error of the wavefront sensing noise is analyzed and the measured results in different photon counting rate levels is presented. Based on it and the residual error induced by atmosphere turbulence, the effectiveness of the system and its relationship between the photon counting rate and the closed-loop bandwidth in different improvement are also analyzed. Both the closed-loop total error and the effectiveness of the system are functions of the photon counting rate and the closed-loop bandwidth. The analysis results show the optimal closed-loop bandwidth with which the total error of the system is minimum is proportional to the 3/8 power of the photon counting rate, and the limiting photon counting rate is about 1200 cps per subaperture, with lower than this photon counting rate the compensation of the system is ineffective.
Guan Chunlin
Jiang Wenhan
Li Mingquan
Ling Ning
Qiu Jie
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