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Proceedings Paper

Infrared adaptive optics system of the 2.16-m telescope and its wavefront detecting error and performance analysis
Author(s): Wenhan Jiang; Mingquan Li; Guomao Tang; Changhui Rao; Ning Ling; Chunlin Guan; Jie Qiu
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Paper Abstract

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.

Paper Details

Date Published: 14 October 1996
PDF: 10 pages
Proc. SPIE 2828, Image Propagation through the Atmosphere, (14 October 1996); doi: 10.1117/12.254181
Show Author Affiliations
Wenhan Jiang, Institute of Optics and Electronics (China)
Mingquan Li, Institute of Optics and Electronics (China)
Guomao Tang, Institute of Optics and Electronics (China)
Changhui Rao, Institute of Optics and Electronics (China)
Ning Ling, Institute of Optics and Electronics (China)
Chunlin Guan, Institute of Optics and Electronics (China)
Jie Qiu, Institute of Optics and Electronics (China)


Published in SPIE Proceedings Vol. 2828:
Image Propagation through the Atmosphere
Christopher Dainty; Luc R. Bissonnette, Editor(s)

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