| 摘要 |
PROBLEM TO BE SOLVED: To provide a crack detector, surely and inexpensively continuously monitoring the occurrence of cracks in a large-sized structure without any increase in number of sensors and complicating wiring. SOLUTION: A conductive thin film 18 is held between two non-conductive thin films 16, 17 to form a thin film sensor 19, and the conductive thin film 18 of the sensor has a corrugated pattern extending in the longitudinal direction of the thin film sensor 19. Current carrying wires 21, 22 extending from a controller 20 for monitoring an electric resistance value are connected to both ends of the conductive thin film 18 having the corrugated pattern. The thin film sensor 19 is stuck to a portion 23a to be inspected of a structure 23, and the conductive thin film 18 is energized to monitor the electric resistance value. Thus, the occurrence of cracks in the portion 23a to be inspected is detected based on an increase in electric resistance value due to breakage of the conductive thin film 18 caused by cracks in the portion 23a to be inspected. COPYRIGHT: (C)2009,JPO&INPIT
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