| 摘要 |
The invention relates to a method for optically measuring the contact wire thickness of a railway catenary, wherein the contact wire has a receptacle for a suspension clamp on both sides of the contact wire in the upper region of the contact wire and is semicircular in the lower region of the contact wire and has a wear region in the contact wire mirror, the manifestation of which wear region is measured. The problem to be solved by the invention is that of developing an optical measurement method that allows the wear of a contact wire to be determined exactly even if said wear is angled, wherein a contactless measurement method shall be used, which measurement method determines the contact wire thickness, the lateral position, and the height of the contact wire especially in train station and siding areas. This problem is solved according to the invention in that the current diameter (DRest) of the contact wire mirror (S) depends on the height (h) of an isosceles triangle related to the semicircular lower contact wire region and on the radius (r) of the contact wire, wherein DRest = r + 0.5 V4r2 - S2 applies in the case of straight wear and a viewing angle < 20°, and a table constructed in steps is created on the basis of this dependence, which table forms the basis for a measuring gauge related to each contact wire type, which measuring gauge allows an associated line length to be read off in the event of a reduction of the total diameter (D) of the contact wire (1), wherein the measuring gauge (4) has the contact wire mirror (S) as a linear reference value and a straight having a defined slope is created by connecting the ends of the lines, which straight is duplicated and mirrored, such that a triangular region is formed in the measuring gauge, which triangular region is digitally placed onto an enlarged measurement recording as a permissible measurement range, which measurement recording is produced by a camera (6) arranged vertically under the contact wire (1), which camera (6) is equipped with one or more lasers (10), such that the actual degree of wear of the contact wire mirror surface is determined and compared with a permissible value and evaluated. |
