Optical Test of a Cooled FPA in Hyper-Spectral Imager: Design, Integration, and Test of the HSI Prototype Developed in Taiwan

摘要

This paper presents the design, integration, and test of the prototype, which consists of a cooled focal plane assembly. Since the most important parameter of the hyper-spectral imager is SNR (signal-to-noise ratio), the theoretical signal-to-noise ratio was simulated carefully for specific optical system and designed mission orbit. The irradiance on focal plane assembly was simulated for several parameters such as orbit attitude, field of view, aperture, grating efficiency, and...etc. Moreover, better cooling of the focal plane assembly and larger aperture of the telescope will lead to higher SNR. Taiwanese user conference of hyper-spectral imaging was held to discuss the domestic user requirements and applications. Several oversea experts have been invited to join the discussion of the hyper-spectral data analysis and the future mission design. The reasonable SNR was considered to be above 200. After the collaboration of the domestic team, we finally finished the integration and test of HSI prototype in 2012. Both the simulation and the test results suggested that a desired signal-to-noise ratio could be achieved by a proper system engineering design. The optical performance of the HSI prototype has been confirmed to be satisfactory as well.