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Long-Term Stability of the NIST Standard Ultrasonic Source.

Steven E Fick1

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899.

Journal of Research of the National Institute of Standards and Technology
|April 21, 2016
PubMed
Summary

The National Institute of Standards and Technology (NIST) Standard Ultrasonic Source (SUS) demonstrated insignificant long-term calibration drift. Ultrasonic power measurements remained stable over 17 years, validating its reliability for interlaboratory comparisons.

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Area of Science:

  • Metrology
  • Acoustics
  • Ultrasonic Power Measurement

Background:

  • The National Institute of Standards and Technology (NIST) Standard Ultrasonic Source (SUS) is a system designed for accurate interlaboratory replication of ultrasonic power levels.
  • It operates at frequencies from 1 MHz to 30 MHz with output power up to 1 W, driven by a standard 50 Ω radio-frequency source.
  • The SUS was commercially available from 1985 to 1999, with calibration data provided for customer-specified points.

Purpose of the Study:

  • To analyze long-term calibration data from NIST Standard Ultrasonic Sources (SUS).
  • To assess variations in ultrasonic power output concerning frequency, power level, and time since initial calibration.
  • To verify the stability and reliability of the SUS for consistent ultrasonic power measurements.

Main Methods:

Keywords:
long term stabilityradiation force balancestandard ultrasonic sourceultrasonic power

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  • Analysis of 102 measurements from multiple NIST SUS systems, including one retained at NIST since 1984.
  • Data spanned a 17-year period, ending in 2001, encompassing 9 calibration points.
  • Comparison of output power variations against frequency, applied power level, and elapsed time since the first calibration.

Main Results:

  • The collected data showed that long-term drift in the calibration of NIST Standard Sources is insignificant.
  • Observed variations were negligible when compared to the uncertainties inherent in ultrasonic power measurement methods.
  • The findings support the claim of calibration stability provided with each SUS unit.

Conclusions:

  • The NIST Standard Ultrasonic Source (SUS) exhibits exceptional long-term calibration stability.
  • The system's reliability ensures consistent and accurate ultrasonic power measurements over extended periods.
  • The SUS is a dependable tool for interlaboratory comparisons and research requiring precise ultrasonic power calibration.