Improved ultrasonic standard reference blocks

“…were particularly encouraging, While it is not presumed that such standards would replace the field-use reference blocks, two-piece quartz blocks may be of value as master or primary transfer standards used for equipment standardization and interlaboratory measurement system comparisons. Figure 30 of [8]. The scatter between these data appears to be no worse than the scatter between data from different sets of blocks of the same size (Figures 3 to 22).…”

Section: Single Materials Standaramentioning

confidence: 84%

“…20, [8]) showed evidence of four-fold symmetry which was probably retained from the early fabrication of the rolled rod. The same uniformity in texture as found in extruded rod is not to be expected in swaged or rolled rod.…”

Section: Metallurgical Cooalhpriiunnhmentioning

confidence: 99%

Improved Ultrasonic Standard Reference Blocks

Sushinsky¹,

Eitzen²,

Chwirut³

et al. 1977

View full text Add to dashboard Cite

“…An extreme example of material variability was reported in a particular No. 5 hole block set [7]. Figure 3 compares the results on that anomalous set with typical data for acceptable blocks (solid line).…”

Section: Block Materialsmentioning

confidence: 98%

“…The resultant one dB variation (from minimum to maximum pulse width) in the spherical target echo demonstrates a difference in sensitivity to the two targets which clearly is not desirable in block calibration. Results like these have led to the conclusion that the flat-bottom-hole provides a better primary reference standard for purposes of block calibration than does the steel sphere [4,7]. With regard to the third approach, various attempts to achieve reproducible results by substituting an electronic source for the echo signal have not been very successful.…”

Section: Primary Reference Standardsmentioning

confidence: 99%

An assessment of ultrasonic reference block calibration methodology

Blessing¹

1983

View full text Add to dashboard Cite

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.

show abstract

Improved ultrasonic standard reference blocks

Cited by 7 publications

References 2 publications

Improved ultrasonic standard reference blocks

Improved ultrasonic standard reference blocks

Improved Ultrasonic Standard Reference Blocks

An assessment of ultrasonic reference block calibration methodology

Contact Info

Product

Resources

About