Measuring and testing – Vibration – By mechanical waves
Patent
1989-10-05
1991-04-16
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73637, 73638, 73641, 73622, 73624, 226176, 226177, G01N 2920, G01N 2926
Patent
active
050072919
ABSTRACT:
Pipe inspection apparatus comprising transducers for transmitting pulsed beams of ultrasonic energy longitudinally, transversely and obliquely into the wall of the pipe for detection of flaws. The apparatus includes a motor driven chuck 18 for rotating the transducers about the a pipe P and motor driven roller 12 for axial movement of the pipe whereby the transducers move in a helical scanning path. A control system 60 maintains the axes of the pipe and circle array of transducers in coincidence and with hydraulic controls 80 maintains each transducer at fixed distance to the pipe for sonically coupling thereto by a flowing liquid whereby a shear wave is generated by each beam in the tubular wall. The transducers comprise multiple pairs, the members of which are diametrically opposed and transmit in opposite directions, for transmitting longitudinally at angles of 12.degree., 27.degree. and 42.degree. to the pipe axis both clockwise and counterclockwise with one transducer of each pair disposed to transmit forward and the other reverse. For longitudinal flaws, one transducer of a pair transmits transverse clockwise and the other transverse counterclockwise. All transducers which transmit in a given direction are arrayed in the axial direction of the pipe. Pulsers 103, 161 simultaneously and repetitively energize and de-energize all forward transmitting transducers and after each such transmission pulsers 105, 162 simultaneously and repetitively energize and de-energize all reverse transducers. Reflection signals of predetermined strength are recorded and activate an alarm. A compressional wave transducer for determining wall thickness is included.
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The Radio and Electronic Engineer, vol. 41, No. 5 (May 1971), pp. 213-222 Authors G. H. Kyte et al., Title-A High Speed Ultrasonic Testing Machine for Tubes.
Thompson Carroll R.
Walters William T.
Miller Craig
Scan Systems, Inc.
Williams Hezron E.
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