| 摘要 |
PURPOSE:To achieve a higher accuracy with a noncontact flaw detection, by emitting an ultrasonic wave to an object to be inspected at a relatively high pressure from an ultrasonic wave emitting means placed far from the object being inspected to detect a fine displacement generated on the surface of the object being inspected with a displacement detection means placed far from the object. CONSTITUTION:A compressed gas is applied to a weld part 1 of a steel body from an accumulator 3 for supplying compressed gas placed at a desired distance therefrom 1. Fine displacement then generated at the weld part 1 of the steel body is detected with a sensor 6 placed at a desired distance therefrom, utilizing the interference of a laser light as irradiated thereby. In other words, the position of the defect is determined from the time difference between the compressed gas application timing and the interfering wave detection timing thereby enabling non-contact flaw detection for a defect or the like. |
