Measuring and testing – Vibration – By mechanical waves
Patent
1996-06-18
1998-06-16
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73644, 376245, 376249, 376252, 976DIG214, G01N 2910, G01N 2926
Patent
active
057674108
ABSTRACT:
A probe inspects steam generator tubing for defects. The probe includes a transducer which generates a localized ultrasonic Lamb wave. The ultrasonic wave is transferred to the tubing by a coupling medium, such as water, that physically couples the transducer and the tubing. Defects in the tubing reflect the ultrasonic wave to the probe which detects the reflections. The results are then used to determine the length and depth of such defects as cracks, pitting, and thinning. The localized ultrasonic wave performs an inspection sensitive enough to detect ligaments between crack segments. This allows highly accurate predictions of tubing integrity and rupture strength.
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Silk, M.G., et al., "The Propagation in Metal Tubing of Ultrasonic Wave Modes Equivalent to Lamb Waves," Ultrasonics, Jan. 1979.
Ditri, J. J., "A Novel Guided Ultrasonic Wave Technique for Improved Tubing Inspection Efficiency", Proceedings of the 11th Conference on NDE in the Nuclear and Pressure Vessel Industries, 30 Apr.-2 May 1992.
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Brook Mark V.
Lareau John P.
Combustion Engineering Inc.
Kananen Ronald P.
Miller Rose M.
Mulholland John H.
Williams Hezron E.
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