Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2005-01-04
2005-01-04
Chapman, John E. (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
C356S502000, C356S503000, C374S119000
Reexamination Certificate
active
06837109
ABSTRACT:
Longitudinal and shear ultrasonic waves are generated inside a material by irradiating a laser beam onto a first surface, e.g., incident surface, of the material. An ultrasonic longitudinal wave and a mode converted wave reflected by a second surface, e.g., a bottom surface, of the material are detected, and times of flight of the ultrasonic longitudinal wave and the mode converted wave are measured. A thickness of the material is measured based on the times of flight and a correlation, obtained in advance, between longitudinal and shear wave velocities of the material and temperature of the material.
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patent: 6078397 (2000-06-01), Monchalin et al.
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J. Krautkramer et al., Ultrasonic Testing of Materials, 3rd Edition, Springer-Verlag New York, 1983, pp. 318-324.*
Monchalin, “Progress Towards The Application Of Laser-Ultrasonics In Industry”, Review of Progress in Quantitative Nondestructive Evaluation, vol. 12, pp. 495-506, 1993.
Monchalin et al., “Wall Thickness Measurement of Tubes and Eccentricity Determination by Laser-Ultrasonics”, Proceedings of the 39thMechanical Work Steel Process Conference, ISS, vol. XXXV, p. 927, 1998.
Klein Marvin B.
Okuno Makoto
Pouet Bruno F.
Sato Hideo
Chapman John E.
Kawasaki Steel Corporation
Lasson Technologies, Inc.
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