| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a method and an apparatus in which the end part (the edge part) of even a nonradiant steel sheet belt can be detected with high accuracy and by a low-cost and extremely simple technique. SOLUTION: The position of incidence or the angle of incidence of optical fiber cables 30, 31 which transmit light to glass rods 34, 35 at illumination heads 32, 32 is adjusted. A grade is given to the intensity of irradiation light radiated from the illumination heads 32, 33. The distribution of the intensity of beams of reflected light from end parts 22, 23 of a rolled material 21 is made nearly uniform irrespective of distances from the illumination heads 32, 33. The plate width and the meandering amount of the rolled material 21 being rolled are detected. The detecting accuracy of the end parts 22, 23 of the rolled material 21 is enhanced sharply. The end parts 22, 23 can be detected with extremely high accuracy even with reference to the rolled material 21 which does not generate a radiation and whose temperature is low. As a result, the performance of hot rolling apparatus is enhanced remarkably.</p> |
