| 摘要 |
PURPOSE:To improve the accuracy of the flaw estimation of a pressure container, etc., by obtaining a picture concentration in the estimation area of the prescribed dimensions from a flaw detection plane picture for each flaw detecting area, and estimating the flaw depth from the relation of the picture concentration and the flaw depth which is prepared beforehand. CONSTITUTION:The scope to detect a flaw of the inner surface of a pressure container 10 is divided into a unit area 18 of the prescribed dimensions, and an ultrasonic wave makes incident diagonally and scans from a probe 1 of a hand scanner 11. An ultrasonic echo received by the probe 1 is inputted into an ultrasonic flaw detecting device 12 and a flaw signal is transmitted. Next, at a video control device 13, the video signal of the cross section and a plane picture are outputted by a flaw signal and a position detecting device 5, and displayed at monitoring television sets 14 and 15. Next, from the picture concentration divided at an estimation area 19, a flaw depth is estimated by the relation of the picture concentration and the flaw depth prepared by experiment data beforehand. Thus, the flaw can be estimated with a good accuracy from the external part simply during the using of a pressure container, etc.
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