Measuring and testing – Vibration – By mechanical waves
Patent
1995-10-25
1999-08-03
Oda, Christine K.
Measuring and testing
Vibration
By mechanical waves
73628, G01N 2904
Patent
active
059328070
ABSTRACT:
A device for the non-destructive testing of hollow tubular objects using ultrasound. The device has a stage for transmission of ultrasonic waves and a stage for reception of ultrasonic signals. The transducer structure includes an assembly of annular individual transducers which are juxtaposed in a coaxial fashion or, in an alternative embodiment, two annular arrays, each of which consists of an assembly of juxtaposed individual transducers. Moreover, the stages for the transmission and reception can simultaneously select, from the assembly or from each of the assemblies, at least one transmitter transducer (2(I)) and at least one receiver transducer (2(j)). This selection forms a transducer sub-assembly which can be displaced at will by electronic scanning along the axis of the succession of transducers in order to enable optimum execution of the so-called TOFD testing method.
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D.F. Loy & J.A. Vano, "Vessel Nozzle Inner Radius Examinations Using Ultrasonic Time-Of-flight Diffraction (TOFD)", EPRI, Vessel & Internals Inspection Conference, San Antonio, TX, Jul. 11-15, 1994.
Barschall Anne E.
Oda Christine K.
U.S. Philips Corporation
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