| 摘要 |
PROBLEM TO BE SOLVED: To precisely measure a plate width at a high response speed, using a simple apparatus structure eliminating the need for extra equipment or the like. SOLUTION: An optical filter composed of interference filters 31a, 32a or the like, by which transmission wavelength, is varied spatially in a direction in which a sheet steel 10 whose width is the object to be measured is conveyed, is arranged in front of light-receiving sections of area sensor cameras 21, 22 being respectively disposed at both ends in the width direction of the sheet steel 10. At least two kinds of scanning line signals whose transmission wavelengths differ from each other, are extracted from imaging data of the area sensor cameras 21, 22, by using scanning line signal extracting means 41, 42. Then, a scanning line signal whose signal level is in a suitable state for measuring, is selected from the at least two kinds of scanning line signals being extracted, and the plate width of the sheet steel 10 is calculated by a plate width calculating means 50, based on the selected scanning line signal, thereby enabling the board width of the sheet steel 10 to be precisely measured at the high response speed, without the need for temperature measuring equipment or the like. COPYRIGHT: (C)2005,JPO&NCIPI
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