Ultrasonic transducer for determining if anisotropic structures

Details Ultrasonic transducer for determining if anisotropic structures Ultrasonic transducer for determining if anisotropic structures

1992-03-30

1993-10-05

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73644, G01N 2924

Patent

active

052494667

ABSTRACT:
A transducer unit for determining the presence of twinned columnar growth in the interior of an as-cast ingot. The transducer unit has a first means for generating and receiving ultrasonic waves and second means for rotating the direction of the wave pulse of the waves. The transducer unit detects the presence of twinned columnar growth by comparing the round trip time of flight (RTTOF) of the ultrasonic waves traveling in a first direction to ultrasonic waves of the same frequency generated in a second direction. In a preferred embodiment, a viscous liquid is used to couple the transducer unit to the ingot.

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Yamaguchi et al., "Effects of Solute Content and Heat Treatment on Elastic Coefficients of Al-Cu Alloys Containing Columnar Crystals", Zairyoshi, vol. 32, No. 352, pp. 94-100.
R. T. Smith, "Stress-Induced Anisotropy in Solids-The Acousto-Elastic Effect", Ultrasonics/Jul.-Sep., 1963, pp. 135-147.

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