18 November 2014 Tilt extraction of scanning Fabry-Pérot interferometer for solar telescope
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Abstract
Tunable Fabry–Pérot (F-P) based narrow band filter has been widely used in large solar telescope, which is utilized to isolate an arbitrary wavelength that we are interested in by adjusting the cavity length. However, it is difficult to guarantee that the mirror scan strictly parallel. As a result, the observations of the solar telescope would be affected. Here, we proposed a method to extract the tilt information of the scanning mirror. At first, the interferogram is obtained on the outer surface of the F-P interferometer. Then an interferogram of double-path is obtained from the multi-beam fringe pattern, which contains the tilt information of the moving mirror. Finally, the Radon transform is used in processing the interferogram to extract the tilted plane. Good results come out of the simulation of this method. It has high accuracy and high stability. It can provide feedback information to the closed-loop control system, and guide the tilt correction.
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Chengmiao Liu, Chengmiao Liu, Jianxin Li, Jianxin Li, Yusheng Sun, Yusheng Sun, Rihong Zhu, Rihong Zhu, } "Tilt extraction of scanning Fabry-Pérot interferometer for solar telescope", Proc. SPIE 9298, International Symposium on Optoelectronic Technology and Application 2014: Imaging Spectroscopy; and Telescopes and Large Optics, 92981W (18 November 2014); doi: 10.1117/12.2072246; https://doi.org/10.1117/12.2072246
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