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Minsup Jeong,Young-Jun Choi,Kyung-In Kang,Bongkon Moon,Bonju Gu,Sungsoo S. Kim,Chae Kyung Sim,Dukhang Lee,Yuriy G. Shkuratov,Gorden Videen,Vadym Kaydash The Korean Astronomical Society 2023 Journal of The Korean Astronomical Society Vol.56 No.2
The Wide-Angle Polarimetric Camera (PolCam) is installed on the Korea's lunar orbiter, Danuri, which launched on August 5, 2022. The mission objectives of PolCam are to construct photometric maps at a wavelength of 336 nm and polarization maps at 461 and 748 nm, with a phase angle range of 0°-135° and a spatial resolution of less than 100 m. PolCam is an imager using the push-broom method and has two cameras, Cam 1 and Cam 2, with a viewing angle of 45° to the right and left of the spacecraft's direction of orbit. We conducted performance tests in a laboratory setting before installing PolCam's flight model on the spacecraft. We analyzed the CCD's dark current, flat-field frame, spot size, and light flux. The dark current was obtained during thermal / vacuum test with various temperatures and the flat-field frame data was also obtained with an integrating sphere and tungsten light bulb. We describe the calibration method and results in this study.