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Pengfei Gao

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Proceedings Article | 8 October 2015 Paper

Construction of pre-slit system of Chinese SONG spectrograph

Pengfei Gao, Zhongwen Hu, Songxin Dai

Proceedings Volume 9678, 967808 (2015) https://doi.org/10.1117/12.2197456

KEYWORDS: Spectrographs, Cameras, Mirrors, Control systems, Telescopes, Space telescopes, CCD cameras, Imaging systems, Astronomical imaging, Correlation function

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The pre-slit system of Chinese SONG spectrograph is a multi-function unit. The main function is to direct the incoming light from the coudé path to the entrance slit of the spectrograph. The specific functions includes maintaining exit pupil stable, fast guiding and telescope focus corrections. The original optics of this pre-slit system were designed by Aarhus University in Denmark. We built the system and designed the software for it. This system holds a guide/slit-viewing camera, a pupil-viewing camera, two tip-tilt mirrors and its tip-tilt controllers. So it includes two sets of the fast-steering mirror systems applied to image tracking and correction. When this image tracking and correction systems is running, the real-time software algorithm will be presented and simulated simultaneously. From the images taken with camera, a closed loop signals are generated for the tip-tilt mirror to correct image motion. When the camera exposure time is 25ms,the correcting frequency of slit imge tip-tilt motion is about 30Hz. The correcting frequency of pupil imge tip-tilt motion is about 1Hz. In addition, a temperature control system surrounding the spectrograph is necessary to keep spectrograph at a constant temperature. The test results shows that the error is about ±0.005°C in 69.4 hours. The results prove that the pre-slit system of Chinese SONG spectrograph is effective and feasible.

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