PURPOSE: To correct the effect of the temperature of water by detecting the temperature of water in contact with an ultrasonic-wave probe which is provided around the outer surface of a long body under test whose cross section has a circular shape, and adjusting the amplitude of an amplifier for the received ultrasonic-wave signal based on the water temperature signal.
CONSTITUTION: The main body of a flaw detecting apparatus is rotated at a high speed. A probe 10 is rotated together. A material to be measured 9 passes the center. The detected flaw signal R from the probe 10 is sent into a detected-flaw-signal processing part 18. The signal is amplified in a receiving amplifier part 21 and transmitted into a defective-signal judging part 22. The signal is judged, and the result is outputted as the flaw-detection result FO. When the temperature of water as a contact material between the probe 10 and the material to be measured rises up, the water temperature is detected with a temperature detector 24 and converted into a sensitivity correcting signal AT in a water-temperature-signal converting part 23. Then, the amplitude in the amplifier part 21 is increased by the decreased amount of the sensitivity caused by the increase in water temperature. On the contracy, when the water temperature is lowered, the amplitude is lowered by the amount of the increase in sensitivity. The detecting sensitivity is kept constant by this correction without large cost increase.
SOMA TAKASHI
FUJISAWA JUNICHI
SUGIMOTO YUKIRO
KIN FUMIO
NIPPON STEEL CORP
| JPS62153744A | 1987-07-08 | |||
| JPS6229021A | 1987-02-07 | |||
| JP61170069B |
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