1Qun Hao, Rong Liang, Mang Cao.et al.Application of laser diode alignment in measuring large-scale perpendicularity and parallelism. SPIE, 1996,Vol.2899,1-5
2Lu Naiguang, Den Wenyi, Yan Bixi.et al.Laser alignment system used for coaxiality measurement of large scale holes.SPIE, 2000,Vol.4222,383-386