SOLAR-C is a solar mission for extreme ultraviolet spectroscopic observation. The Ultra Fine Sun Sensor (UFSS) will make a vital contribution to achieving a high pointing accuracy of the mission. One of the requirements on accuracy of the UFSS is a “linearity error” —bias error after characterization— of less than 2 arcseconds (peak-to-peak) over the UFSS’s field of view of 1.0 × 1.0 degrees. In this study, we developed a measurement system with a laser interferometer in the current test facility consisting of a solar simulator light source and a two-axis gimbal stage, allowing us to calibrate the measurements and characterize the UFSS with accuracy better than 1 arcsecond. We evaluated how well we can determine the gimbal’s pointing and its stability with respect to the solar light beam from the solar simulator. We concluded that by using the developed testing system and the procedures, we can measure the UFSS with sufficient accuracy.
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