MEASURING INSTRUMENT FOR THREE-DIMENSIONAL SHAPE OF STRUCTURE SURROUNDING RAILROAD TRACK

摘要

PURPOSE: To obtain a measuring instrument for a three-dimensional shape which enables short-time and precise measurement of the three-dimensional shape of a structure surrounding a railroad track, such as a tunnel, on the side along the track. ;CONSTITUTION: An image processing device 5 determines the three-dimensional coordinates of a light-section line on the wall surface of a tunnel T, using as a reference point a TV camera 3 for a structure which is disposed on a moving truck 1 made to run on rails RR and RL and picks up an image of the light-section line on the wall surface of the tunnel T, and also it determines the three-dimensional coordinates of a light-section line showing specified parts of the rails RR and RL, using as a reference point a TV camera 4 for the rails which is disposed on the moving truck 1 and picks up an image of the light-section line on the rails RR and RL. Based on these three-dimensional coordinates and the coordinates showing the positional relationship of the two TV cameras 3 and 4, a computer 6 determines the three- dimensional coordinates of the light-section line on the wall surface of the tunnel T, using as a reference point the middle point between tracks in accordance with the running of the moving truck 1. According to this constitution, a measuring error due to shaking of the moving truck 1 can be made very small.;COPYRIGHT: (C)1993,JPO&Japio