Study of laser lofting using semiconductor laser for railway tunnel

In this paper,we develop a laser lofting technique for railway tunnel using semiconductor laser,and it can make the lofting instrument more lighter and easy to be carried.Among this technique,we use a simple,economical and practical collimation method single lens collimation method to collimate semiconductor laser beam,and use moving objective scanning method to make laser point scan on the lofting plane.Theoretic analysis and experiment results show that this lofting technique is feasible.