21 September 2011 Opto-mechanical performances of slewing mirror space telescope for GRB detection
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The UFFO (Ultra-Fast Flash Observatory) Pathfinder is a space instrument onboard the Lomonosov satellite scheduled to be launched in November 2011. It is designed for extremely fast observation of optical counterparts of Gamma Ray Bursts (GRBs). It consists of two subsystems; i) UBAT (UFFO Burst Alert & Trigger Telescope) and ii) SMT (Slewing Mirror Telescope). This study is concerned with SMT opto-mechanical subsystem design and optical performance test. SMT is a F/11.4 Ritchey-Chretien type telescope benefited from compact design with a short optical tube assembly for the given focal length of 1,140 mm. SMT is designed to operate over a wide range of wavelength between 200 nm and 650 nm and has 17 arcmin FOV (Field of View), providing 4 arcsec in detector pixel resolution. The main detector is 256 x 256 ICCD (Intensified Charge-Coupled Device) of 22.2μm in pixel size. This SMT design offers good imaging performance including 0.77 in MTF at Nyquist frequency of 22.52 /mm and 2.7 μm in RMS spot radius. The primary (M1) and secondary (M2) mirror are hyperbolic surfaces and were manufactured within 1/50 waves (He-Ne, 632.8nm) in RMS surface error. After completion of the initial integration, the SMT opto-mechanical subsystem reached to the system wavefront error better than 1/10 waves in room temperature. We then tested the opto-mechanical performances under thermal cycling and vibration. In this study, we report the SMT subsystem design solution and integration together with thermal and vibration test results.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ki-Beom Ahn, Ki-Beom Ahn, Soomin Jeong, Soomin Jeong, Sug-Whan Kim, Sug-Whan Kim, Jiwoo Nam, Jiwoo Nam, Pisin Chen, Pisin Chen, Hyeunseok Choi, Hyeunseok Choi, Yeon Ju Choi, Yeon Ju Choi, Bruce Grossan, Bruce Grossan, Indra Herman, Indra Herman, Ming-Huey A. Huang, Ming-Huey A. Huang, Aera Jung, Aera Jung, Jieun Kim, Jieun Kim, Yewon Kim, Yewon Kim, Jik Lee, Jik Lee, Heuijin Lim, Heuijin Lim, Eric Linder, Eric Linder, Tsung-Che Liu, Tsung-Che Liu, Kyoungwook Min, Kyoungwook Min, Gowoon Na, Gowoon Na, Koo Hyun Nam, Koo Hyun Nam, Michel I. Panasyuk, Michel I. Panasyuk, George Smoot, George Smoot, Young D. Suh, Young D. Suh, Sergey Svertilov, Sergey Svertilov, Nikolay Vedenkin, Nikolay Vedenkin, Ivan Yashin, Ivan Yashin, Myungheh Cho, Myungheh Cho, Il H. Park, Il H. Park, "Opto-mechanical performances of slewing mirror space telescope for GRB detection", Proc. SPIE 8167, Optical Design and Engineering IV, 81671C (21 September 2011); doi: 10.1117/12.896499; https://doi.org/10.1117/12.896499


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