Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2006-05-12
2011-12-13
Williams, Hezron E (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
C073S579000, C073S598000, C073S602000, C073S606000, C073S865800
Reexamination Certificate
active
08074520
ABSTRACT:
A transmission probe and a reception probe for transmitting and receiving a wideband ultrasonic wave are provided. Each time when the locations of the probes and are moved, a received wave Gj(t) is obtained. Based on a spectrum Fj(f) corresponding to the received wave Gj(t), a narrowband spectrum FAj(f) is extracted. A component wave GAj(t) corresponding to the narrowband spectrum FAj(f) is found by inverse Fourier transformation. A longitudinal wave primary resonance frequency f1having a relationship with a thickness W (mm) of an inspection target and a primary resonance frequency fS1of a transverse wave generated by mode conversion are calculated. A comparative display of the component waves GAj(t) is presented using f1, fS1and sizing coefficients ns1, ns2, ns3and ns4for high precision inspection. Based on the measurement point which shows a wave generation in the comparative screen of the component waves GAj(t), it is determined that there is a flaw Z at a certain position inside the inspection target immediately below a line segment connecting the transmission probe and the reception probe.
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Dohi Nobuki
Hasegawa Yukihisa
Hirose Masayuki
Kameyama Masashi
Okumura Mitsuo
H & B System Co. Ltd.
Kozo Keikaku Engineering Inc.
Osha • Liang LLP
Redmann Gregory J
The Kansai Electric Power Co. Inc.
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