Measuring and testing – Vibration – By mechanical waves
Patent
1997-10-10
1999-11-30
Williams, Hezron
Measuring and testing
Vibration
By mechanical waves
73629, 73634, G01N 2906, G01N 2910
Patent
active
059922362
ABSTRACT:
Radially spaced calibration holes are drilled parallel to the exterior surface of a cylindrical shell for a dryer roll. An ultrasonic transducer is mounted in a fixture filled with a coupling medium which allows for adjustment of the spacing and angle of the transducer which traverses the shell as it is rotated. The transducer produces a signal directed to the shell. A computer calculates the time the signal takes to travel from and return to the transducer and the depth of the shell from which the signal returns. A clear signal corresponding to holes up to one inch from the surface are found by adjusting the ultrasonic transmission angle. This angle is approximately 23 degrees from a normal to the casting surface. The calibrated transducer traverses the surface of the shell. The signals are gathered and stored to create data which may be used in maintaining the shell for the dryer roll.
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Nondestructive Testing Handbook (2d Edition, .COPYRGT.1991, American Society for Nondestructive Testing), vol. 7, Ultrasonic Testing, pp. 168, 254-257, 299-300, 400-401, 605-607, 864-865.
Fearnside Richard L.
Voll Gordon R.
White Dennis A.
Beloit Technologies Inc.
Campbell Raymond W.
Kwok Helen C.
Mathews Gerald A.
Williams Hezron
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