Far-Infrared Interferometric Telescope Experiment (FITE): II. Sensor Optics
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概要
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We developed the sensor optics of the Far Infrared Interferometric Telescope (FITE). The spatial resolution of FITE is expected to be 2.5 arcseconds. In order to reconstruct images, precise measurements of the visibility of the interference are necessary. For this purpose, we designed the focal plane of FITE. The focal plane is the entrance focus of the sensor optics. Its camera optics has the F/106 beam for each beam of the interferometer. The PSF is dominated by diffraction, and its size corresponds approximately to the array size so that the fringe pattern can be measured by the array in the sheet. The sensor optics consists of two infrared detectors and the optical CCD. Each detector is installed on the final focal plane of the sensor optics. The far-infrared detector has the format of 15 pixels with 1.5 mm pitch. The mid-infrared detector and the optical CCD are developed as the sensor for the interferometer alignment. The sensor optics and the detectors are installed on the cryostat. Because of their sufficient specifications, we believe to achieve the 2.5 arcsecond spatial resolution.
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