FLAW INSPECTION APPARATUS FOR STEEL PLATE

• Main Authors: NISHIOKA RYOJI, MURATA TOSHIMICHI, MIZUKAMI KAZUSANE, NAGASE MAGONORI, YAMADA YOSHIRO
• Format: Patent
• Language: English
• Published: 28.04.2000
• Edition: 7
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To provide a flaw inspection apparatus for a steel plate, by which all kinds of flaws can be detected with a simple constitution and without being restricted by an installation place. SOLUTION: A linear light source 12 which shines radiates the surface of a steel plate 1 with illumination light is installed obliquely by setting an angle θto the horizontal direction with reference to a line C which is at a right angle to a line direction. A camera 14, which pickes up its reflected light images, uses the nearly whole width on the surface of the steel plate as the visual field of an image pickup operation, and the angle of elevation from the center of the visual field is set according to the arrangement state of the linear light source 12. Thereby, the linear light source 12 can irradiate with the illumination light so as to form a shadow in the reflected light image in the same manner as an uneven flaw, and a linear flaw in the line direction can be detected surely.