In-Motion Inspection of Obstacles around Railways by a Highly Accurate Laser-Sectioning Method

A B S T R A C T Nowadays. the automat izalton of railway maintenance work i s a rirm requirenent. In ordpr to respond in part to t h i s requirement. a practical ohstacle detecting syslcm based on an ori~inal laser-sectioning method has been developed. I t *as conrlrmed that the calibration for the ohstacle detcction was porlorm~d to an accuracy of mnrr than 5 mm. Noreover. a ttieoretical e s t inat ion predicted that dynamic errors sho111d be rejected to less than S m m hy detcctinn o l rails. A field Lest confirmed a sz~flicienlly high sensi-b ~ l ~ i y nf actual Fmr:il itips detpction at a runninpl s p e ~ d o f 4 Okm/h.