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12 September 2012 Development of new optical adjustment system for FITE (Far-Infrared Interferometric Telescope Experiment)
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We have developed a balloon-borne, astronomical far-infrared interferometer (FITE). Because the interferometer is a Fizeau-type two beam interferometer consisting of two off-axis parabolic mirrors, it is important to establish a method by which the two beams can be adjusted simultaneously. A conventional Hartmann test was originally employed in our previous system, but it enabled the adjustment of only one beam at one time, thus quite inefficient. We developed a new optical adjustment system that can simultaneously measure and evaluate two beams by using a Shack - Hartmann wave front sensor. In the first stage, the field of view (FOV) of the wave front sensor was adapted to the full beam size of 40 cm (the beam diameter), and the mirror surface accuracy as well as the mirror alignment were measured and adjusted for each beam. After the adjustment of both beams, they are focused at the input aperture hole of the far-infrared sensor system by expanding the FOV of the wave front sensor so that it included both beams. With this new method, we can make real-time measurements and analyses of converging beams, and can also realize fast switching between the single beam mode and double beam mode. We demonstrated this new adjustment method by performing laboratory measurements, and designed and assembled the new optical adjustment system for FITE.
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Ayana Sasaki, Hiroshi Shibai, Takahiro Sumi, Misato Fukagawa, Tetsuo Kanoh, Kodai Yamamoto, Yusuke Itoh, Yukako Aimi, Yoshihiro Kuwada, Yuki Kaneko, Mihoko Konishi, Syoko Sai, Naoki Akiyama, and Masanao Narita "Development of new optical adjustment system for FITE (Far-Infrared Interferometric Telescope Experiment)", Proc. SPIE 8445, Optical and Infrared Interferometry III, 84452Z (12 September 2012); doi: 10.1117/12.925836;

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