Development of the calibration device using UAV mounted UV-LED light source for the fluorescence detector Takayuki Tomida, Taichi Inadomi, Terutsugu Seki, Yuichiro Tameda, Yuya Oku and Kengo Sano EPJ Web Conf., 210 (2019) 05015 Published online: 17 May 2019 DOI: 10.1051/epjconf/201921005015