| 摘要 |
PURPOSE:To detect accurately the residual thickness of refractories or the like by calculating the position of a laser beam bright point in accordance with the principle of triangulation and obtaining an intra-furnace shape on a basis of the position of the detected laser beam bright point while rotating and moving a measuring lance. CONSTITUTION:A measuring lance 12 is allowed to fall by a driving part 18, and its T-shaped front end part 12A is set to a position near a furnace wall bottom surface 10C, and a laser beam 22 is projected from a light projector 23 at a projection angle alpha to the furnace wall bottom surface 10C. A bright point 24A on the furnace wall bottom surface 10C is sent to an ITV 30 from a photodetector to obtain a video signal, and this signal is inputted to a minicomputer 34 to store the position of the bright point. This operation is repeated while rotating and raising the measuring lace 12 to scan the furnace wall bottom surface 10C and a furnace wall side surface 10B, and bright point image positions, lance rotation angles beta, and lance moving displacements D in position where measurement is necessary are inputted to the minicomputer 34. Coordinates of individual points of the intra-furnace profile obtained in this manner are obtained in accordance with the principle of triangulation on a basis of position coordinates of the light projector 23 and the photodetector 28, light projection angles alpha, lance rotation angle beta, a photodetector azimuth gamma, and position coordinates N of an optical image. |
