Ultrasonic Continuous-Wave Beam-Power Measurements; International Intercomparison

Tschiegg, Carroll E.; Greenspan, Martin; Eitzen, D. G.

doi:10.6028/jres.088.005

Cited by 11 publications

(12 citation statements)

References 29 publications

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“…Except for the code RM-1, which publicly identifies the pilot laboratory, each code has been disclosed only to the laboratory that used that method. For each laboratory and measurement method, the data reported for each transducer were summarized in a table published by the NBS in 1983 [4], listing the range of applied voltage, the uncertainty of voltage measurements, and the range, mean, and uncertainty of . Since each laboratory estimated uncertainties according to its own criteria, the uncertainties listed in the table had no common basis.…”

Section: Results Published In 1983mentioning

confidence: 99%

“…Since each laboratory estimated uncertainties according to its own criteria, the uncertainties listed in the table had no common basis. In accordance with the practice at the pilot laboratory at the time, the uncertainty published in 1983 [4] for each value of based on ultrasound power and electrical voltage measurements was taken to be the linear sum of the component uncertainties. Inspection of the contents of these tables revealed that "by and large, there is rather remarkable agreement in the measurement of ultrasonic beam power at the power levels specified among the several laboratories and methods (or cases)".…”

Section: Results Published In 1983mentioning

confidence: 99%

“…Inspection of the contents of these tables revealed that "by and large, there is rather remarkable agreement in the measurement of ultrasonic beam power at the power levels specified among the several laboratories and methods (or cases)". * [4].…”

Section: Results Published In 1983mentioning

confidence: 99%

“…In the 1983 report [4] and in this article, the term "case" refers to a method of measurement by a particular laboratory; results for the two nominal frequencies are considered separately. A case comprises several groups of data.…”

Section: Results Published In 1983mentioning

confidence: 99%

“…The conclusions drawn from this analysis are recapitulated in Section 4. Contrary to more recent practice, the 1983 report [4] presented its data entirely in tabular form, and made no effort to explore the degree of statistical consistency of the results submitted by individual laboratories.…”

Section: Results Published In 1983mentioning

confidence: 99%

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Ultrasonic continuous wave beam-power measurements: 1978-1980 international comparison

Fick¹

1999

Metrologia

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Four half-wave resonant, air-backed, x-cut quartz disc transducers designed and fabricated at the National Bureau of Standards (NBS) were circulated among seven laboratories between February 1978 and June 1980. Participants were given detailed instructions, including values and tolerances for the amplitude and frequency of the sinusoidal voltages to be applied to each transducer. Five distinct methods were used to measure the total continuous-wave beam power radiated by each transducer into a reflectionless water load. Two independent electrical techniques were used to directly measure radiation conductance. A detailed tabulation of the results was published by the NBS in 1983.Of the 1160 measurements of power or radiation conductance constituting the result of this collective effort, 90 % were made using four techniques based on radiation pressure. In this paper, current methods of uncertainty analysis are applied to a representative sample of data from radiation-pressure measurements. Old and new analyses are compared to assess the sensitivity of results to the choice of computational methods. Newly computed combined standard uncertainties are smaller than the original uncertainties for more than 60 % of the data considered. For the remaining data, the newly computed uncertainties are considerably larger than the original values; sufficiently large to make the average effect an increase of more than 15 %.

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Section: Results Published In 1983mentioning

confidence: 99%

Section: Results Published In 1983mentioning

confidence: 99%

Section: Results Published In 1983mentioning

confidence: 99%

Section: Results Published In 1983mentioning

confidence: 99%

Section: Results Published In 1983mentioning

confidence: 99%

See 3 more Smart Citations