Research on the Application of Fast-steering Mirror in Stellar Interferometers |
| |
| Authors: | Mei Rong Hu Zhong-wen Xu Teng Sun Chang-sheng |
| |
| Institution: | 1. Nanjing Institute of Astronomical Optics & Technology, National Astronomical Observatories, Chinese Academy of Sciences, Nanjing 210042;2. Key Laboratory of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing 210042;3. University of Chinese Academy of Sciences, Beijing 100049 |
| |
| Abstract: | In stellar interferometers, the fast-steering mirror (FSM) is widely utilized to correct the wavefront tilt caused by the atmospheric turbulence and internal instrumental vibration, because of its high resolution and fast response frequency. In this study, the non-coplanar error between the FSM and the actuator deflection axis introduced by the manufacturing, assembly, and adjustment is analyzed systematically. Via a numerical method, the additional optical path difference (OPD) caused by the above factors is studied, and its effect on the fringe tracking accuracy of a stellar interferometer is also discussed. On the other hand, the starlight parallelism between the beams of two arms is one of the main factors for the loss of fringe visibility. By analyzing the influence of wavefront tilt caused by the atmospheric turbulence on fringe visibility, a simple and efficient real-time correction scheme of starlight parallelism is proposed based on a single array detector. The feasibility of this scheme is demonstrated by a laboratory experiment. The results show that after the correction of fast-steering mirror, the starlight parallelism meets preliminarily the requirement of a stellar interferometer on the wavefront tilt. |
| |
| Keywords: | atmospheric effects instrumentation: interferometers techniques: interferometric techniques: image processing stars: imaging |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
