Measuring and testing – Vibration – By mechanical waves
Patent
1992-05-12
1994-09-27
Noland, Tom
Measuring and testing
Vibration
By mechanical waves
73612, 73622, 73624, 364563, G01N 2910
Patent
active
053498607
ABSTRACT:
An apparatus for measuring the thickness of a clad material having an outer mother metal and an inner clad metal. The apparatus includes a transmitter crystal and a receiver crystal of a double crystal angle-type probe which contact the outer surface of the mother metal, for receiving a first echo from the boundary surface of the mother metal and clad metal, and for receiving a second echo from the inner, bottom surface of the clad metal. The apparatus further includes an amplifier for amplifying the echo signals, a detector for detecting the zero-crossing points of the echoes, a zero point determining circuit, a calculator for calculating the periods from a zero point in time to the zero-crossing points, and a calculator for calculating the thickness of the clad material and clad metal based on the calculated periods.
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Hirano Yoshiharu
Katsumata Takeshige
Nakano Kazuko
Nakano, deceased Tetsuo
Narushima Isao
Finley Rose M.
NKK Corporation
Noland Tom
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