Procedures for the calibration of ASTM E127-Type ultrasonic reference blocks

Chwirut, Daniel J.

doi:10.6028/nbs.tn.924

Cited by 4 publications

(9 citation statements)

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“…While such behavior is usually ascribed to changes in the spectral content of the pulsed wave form, and the scatterers' distinctive frequency dependent responses to that pulse [13,22,23], mode conversion subtleties may also be playing a significant role [24] It is not clear how these pulse variables may be controlled in practice, except that at least the pulse width and shape should be kept constant. The NBS does use a constant pulse width for its reference block calibration work, and monitors the shape and spectral content of the output pulse [25] The ASTM is considering in a draft document, the use of a square wave pulse of specific width related to the wave frequency [18].…”

Section: Pulser/receivermentioning

confidence: 99%

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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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Section: Pulser/receivermentioning

confidence: 99%

“…8 holes (as determined by an 11/16 inch sphere) will be about sixteen percent higher. Finally, we note that the use of check standards, for example a specific block or group of blocks (two are used in the NBS procedure for each hole size [25]), would serve several important purposes:…”

Section: Primary Reference Standardsmentioning

confidence: 99%

An assessment of ultrasonic reference block calibration methodology

Blessing¹

1983

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“…The details of this service are given in [5] and summarized in Section 3.8 of this report. The service will be generalized.…”

Section: Recommended Practice For Fabrication and Control Of Steel Rementioning

confidence: 99%

“…Only amplitude response data were recorded using the tuned flaw detection system. Details of the mechanics of datataking, transducer characteristics, and typical waveform photographs are included in the first annual report [5].…”

mentioning

confidence: 99%

Improved Ultrasonic Standard Reference Blocks

Sushinsky¹,

Eitzen²,

Chwirut³

et al. 1977

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“…Two previous reports [3,4] have described initial NBS activities directed toward quantifying, understanding, and minimizing the variability of measurements taken with the ASTM-type reference block system. These studies identified metallurgical variables as an important consideration in the manufacture of repeatable reference blocks, identified and quantified some system parameters that must be controlled if repeatable measurements are to be obtained, reported results on pilot experiments for new manufacture concepts, and formed the technical rationale for the establishment of a calibration and loaner service for aluminum blocks [5],…”

mentioning

confidence: 99%

Recent improvements to the ASTM-type ultrasonic reference block system

Chwirut¹

1979

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Recent activities aimed toward improving the ASTM-type ultrasonic reference block system are described. On the aluminum block system (ASTM E127 and NBS TN 924), efforts were focused on better definition of the measurement equipment (transducer and instrument) , the implementation of a Measurement Assurance Program and Loaner Block Service, and modeling of the distance-amplitude relationship.It is shown that a large increase in the precision of reference block readings is easily achievable by implementing simple changes and controls in the measurement procedure. On steel and titanium blocks (e.g. ASTM E-428) efforts were directed toward quantifying the extent of reproducibility possible among blocks fabricated by both conventional drilling and by diffusion bonding.Reasonable reproducibility is achievable by both, with the diffusion-bonding process offering both advantages and disadvantages.

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Procedures for the calibration of ASTM E127-Type ultrasonic reference blocks

Cited by 4 publications

References 1 publication

An assessment of ultrasonic reference block calibration methodology

An assessment of ultrasonic reference block calibration methodology

Improved Ultrasonic Standard Reference Blocks

Recent improvements to the ASTM-type ultrasonic reference block system

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