轨道检测, 激光准直, 光电检测, 坐标转换

A new measuring method for crane rails which is 300 meters long and 50 meters span was presented. The measuring method used collimated laser beams as datum lines. A car carrying position sensitive detector(PSD) walked along rail and the parameters of the rail were obtained according to the spot position on PSD. In order to figure out the difficulties in measuring large-span rails, the measuring process for parameters of the two rails were developed separately and then the two groups of the results were transformed into one coordinate system. The results of computer simulation show that the order of magnitude of principle error is 10nm, which proves that the method can fully meet the requirements of measuring large-length and large-span rails.