Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2005-07-06
2011-11-08
Williams, Hezron E (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
Reexamination Certificate
active
08051717
ABSTRACT:
The measurement of a flaw height in a thick welded portion of a stainless steel specimen, which is difficult to perform by the TOFD method, can be conducted with more ease, with higher accuracy and in a shorter time than in the case of using tip echo techniques. In addition, it is possible to reduce variations in measurement results among individual inspectors.An ultrasonic wave21is launched by a transmitting probe1into a specimen20in a direction oblique to a flaw24to generate diffracted waves at the tip25of the flaw24, then a diffracted wave22propagating upward directly from the flaw24and a diffracted wave23propagating upwardly of the flaw24after once reflected off the back27are received by a receiving probe2disposed above the flaw24, and the height of the tip of the flaw24from the back27is measured from the propagation time difference between the received diffracted waves.
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Fukutomi Hiroyuki
Lin Shan
Ogata Takashi
Central Research Institute of Electric Power Industry
Notaro, Michalos & Zaccaria P.C.
Shah Samir M
Williams Hezron E
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