A reappraisal of the variability of ultrasonic transducers

Lidington, B.H.; Silk, M.G.

doi:10.1016/0029-1021(74)90107-8

Cited by 6 publications

(4 citation statements)

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“…*This is presumably the reason why sizing of tight fatigue cracks based on the timing of bulk wave pulses diffracted from the edge is successful, whereas the use of surface waves, which must travel over the entire crack face, breaks down (Lidington et al, 1976). Figure 4-An ellipse "pressed in" at one end, and its corresponding caustic.…”

Section: Discussionmentioning

confidence: 99%

Ultrasonic caustics in non-destructive evaluation

Doyle¹

1980

J. Phys. D: Appl. Phys.

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Caustics formed in the field diffracted by defects are explored theoretically as a possible approach to the inverse scattering problem for ultrasonic non-destructive evaluation. The case of crack-like defects is considered in detail using the geometrical theory of diffraction. The involute of the far-field caustic reproduces the projection of the crack edge in the incident beam direction, for a plane incident wavefront. This purely geometrical inversion is carried out uniquely for the asteroid and its involute, the elliptical edge. For a general edge shape, the complete inversion requires one further length measurement, which may be carried out in some cases by further experiments with caustics. Useful limitations on the possible shapes of caustics are explained on the basis of catastrophe theory.

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Section: Discussionmentioning

confidence: 99%

Ultrasonic caustics in non-destructive evaluation

Doyle¹

1980

J. Phys. D: Appl. Phys.

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“…Other models have been developed to include the effects of pressure on an unbonded interface [3,4,5] and have predicted a decrease in reflection coefficient ofup to a factor of three. Other models [6] have predicted the reflection and transmission coefficients as a function offrequency and an example ofsuch a calculation is shown in Figure 2(a).…”

Section: The Effect Of Pressure On Interfaces Modelingmentioning

confidence: 99%

Kissing Bonds in Diffusion Bonded Parts

Taylor

1997

Review of Progress in Quantitative Nondestructive Evaluation

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“…In this section we deal with the standardization problems associated with transducers in ultrasonic measurement systems. The need for dealing with the variability of ultrasonic measurement due to transducer characteristics have been reemphasized frequently in the open literature; see for example [25][26][27]. Two basic questions seem to arise:…”

Section: The Characterization Of Ultrasonic Transducers For Ndementioning

confidence: 99%

“…The objective of this work was to characterize a number of commercial ultrasonic transducers of various types and to examine the correlation of transducer characteristics with their performance in detecting flaws of several types. The motivation for the work is the wide variation in the performance of ultrasonic transducers [25,26]. Its objective is the correlation of the effect of these parameters with the reliability of ultrasonic inspection procedures for small fatigue cracks.…”

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confidence: 99%