High-precision two-phase laser rangefinder PFSD-1,2 Yegisabeth Hayrapetyan, Hovseph Petrosyan, Hovnan Hunanyan and Artyom Tsaturyan E3S Web Conf., 97 (2019) 06042 Published online: 29 May 2019 DOI: 10.1051/e3sconf/20199706042