| 摘要 |
PURPOSE:To accurately detect the deterioration of turbine parts, by correcting the ultrasonic echo, which is reflected from the damage region of turbine parts and returned to a probe, with a prepared measured value and judging whether the correction value exceeds a reference value. CONSTITUTION:The shower wave and flaw echo, which enter the creep damage region in a turbine from an ultrasonic probe 11 and reflected therefrom to be returned to said probe, are observed. A hardness meter 12 measures the surface hardness of turbine parts and inputs the result thereof to an operation circuit 13. An operation circuit 13 corrects the echo detected by the probe 11 on the basis of the measured value detected by the hardness meter 12 to judge whether the correction value exceeds a reference value and the presence of the deterioration of turbine parts is judged. |
