an appraisal of current and future needs in ultrasonic NDE standards

Birnbaum, George; Eitzen, D. G.

doi:10.6028/nbs.ir.79-1907

Cited by 2 publications

(1 citation statement)

References 16 publications

(43 reference statements)

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“…Here, however, we mention those qualities which an ideal calibration standard might possess [30] : 1.…”

Section: Appendixmentioning

confidence: 99%

An assessment of ultrasonic reference block calibration methodology

Blessing¹

1983

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Illustration of an ultrasonic flat-bottom-hole reference block.The principal components of an ultrasonic calibration system for reference blocks:the transducer, the pulser/receiver , the primary reference standards, the reference blocks and the immersion tank and yoke system to suspend and manipulate the transducer relative to the targets.Echo amplitude data as a function of metal-path distance for an anomalous reference block set (diamonds), compared with typical values (solid line).A continuous profile scan of the back-surface echo amplitude from A) the anomalous block material, and B) the normal block material.Far-field center axis beam profiles of a ceramic (dashed line) and a quartz transducer (solid line).Reference-block-echo amplitude data taken with a ceramic transducer (discrete points), relative to that taken with a quartz transducer (solid line), as a function of metal path distance for a No. 5 hole set. Ceramic values using two distinct targets before the application of correction factors (diamonds and triangles), compared to the corrected values (stars) using a block target. 1 LIST OF TABLES Table 1 Table 2 Relative echo amplitude responses of a reference block (5-0050) and a steel sphere (5/16-inch diameter) as a function of pulse width.Steel sphere diameters used to set system sensitivity for the respective block hole sizes, according to ASTM E127. Suggestions for improving present practices are given, and extensive reference to the relevant technical literature is made.

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“…Here, however, we mention those qualities which an ideal calibration standard might possess [30] : 1.…”

Section: Appendixmentioning

confidence: 99%