Measuring and testing – Vibration – By mechanical waves
Patent
1996-03-12
1997-10-28
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73628, 73623, 376249, 376252, G01N 2906, G01N 2910
Patent
active
056819951
ABSTRACT:
An ultrasonic flaw detecting apparatus for efficiently detecting a flaw existing in a deep portion of a multi-layer structure includes a first sensor arranged so as to transmit an ultrasonic wave into a different property layer surrounded by a medium having a different acoustic impedance in the multi-layer structure, a function generator for generating a pulse-shaped sine wave, a power amplifier for amplifying and supplying the pulse-shaped sine wave to the first sensor, a second sensor arranged so as to receive a boundary echo from the different property layer, a first amplifier for amplifying the boundary echo received by the second sensor, an intensity detector for judging the intensity of an amplified signal of the boundary echo, a third sensor arranged so as to receive an echo from a flaw inside a layer in a deep portion of the different property layer, a second amplifier for amplifying the flaw echo received by the third sensor, a recorder for recording the amplified flaw echo signal, and a control unit for reading data from the intensity detector and outputting commands to the function generator and the recorder.
REFERENCES:
patent: 5118464 (1992-06-01), Richardson et al.
patent: 5377237 (1994-12-01), Richardson et al.
patent: 5492012 (1996-02-01), Terhune
Awamura Norio
Koga Kazunori
Ooura Takehiro
Takahashi Fuminobu
Babcock-Hitachi Kabushiki Kaisha
Hitachi , Ltd.
Miller Rose M.
Williams Hezron E.
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