| 摘要 |
PROBLEM TO BE SOLVED: To detect cracks in the inner surface of the cooling hole (formed in a blade) of the blade of a gas turbine with ample sensitivity. SOLUTION: A two-vibrator type ultrasonic probe 12 is opposed to the moving blade 10 of the gas turbine and an ultrasonic wave is transmitted to the target inner surface of the cooling hole from the ultrasonic probe 12, by using a vertical flaw detection method to receive the reflected echo from the inner surface of the cooling hole. The ultrasonic probe 12 is scanned along the surface of the moving blade, while executing this flaw detection method to acquire the B scope display accompanied by the scanning of the ultrasonic probe 12. The presence of the crack of the inner surface of the cooling hole is determined on the basis the B scope display. COPYRIGHT: (C)2008,JPO&INPIT
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