PURPOSE: To make appropriate the identification of outputted wave shape from different defect sections and obtain effective and exact inspection results based on the classification of the kinds of flaws by using flaw detection pulse signals and carrying out analog wave shape judgement.
CONSTITUTION: The surface of a moving object to be inspected such as a moving steel plate is scanned in the direction transverse to the movement and a defective part on a scanning line is detected by an optical means 1. The output of a light-receiving element in the optical means 1 is supplied by division to a differential amplification circuit 2 and a non-differential analog delay circuit 5. The output of the circuit 5 is outputted for a certain time by means of the defect inspection pulse that is the output of the circuit 2, and the inspection output is obtained through each of circuits 8 and 8a that judges the polarity and pulse width of defective output wave shapes.
KITSUKA HIDEO
FURUKAWA YUKIO
MASUNO YASUHIKO
AKUTSU SHIYOUJI
KAWASAKI STEEL CO
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