2023_programme: The results and discussion of CCAUV.W-K2. An International key comparison of freefield hydrophone calibrations as undertaken by 8 National Metrology Institutes.

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  • Session: 18. Underwater acoustic calibration and standards
    Organiser(s): Stephen Robinson, Markus Linné and Victor Évora
  • Lecture: The results and discussion of CCAUV.W-K2. An International key comparison of freefield hydrophone calibrations as undertaken by 8 National Metrology Institutes. [invited]
    Paper ID: 2022
    Author(s): Ford Benjamin, Robinson Stephen, Ablitt Justin
    Presenter: Ford Benjamin
    Abstract: While the NMIs (national metrology institutes) across the world represent the ultimate realization of the SI Units within their respective countries there is potential for discrepancies between the different NMIs themselves. To address this in the field of underwater acoustics, Key Comparisons are organised by the Consultative Committee on Acoustics, Ultrasound and Vibration (CCAUV) of the CIPM. Participants in a Key Comparison, in sequence, undertake a calibration of the same hydrophone, allowing a direct comparison of each NMI’s realisation of the acoustic pascal. \n\nThe final report on the Key Comparison CCAUV.W-K2 has been published. This included contributions from the NMIs in Brazil, China, India, Russia, South Africa, Turkey, UK and USA, with the UK NMI, NPL, having undertaken the project coordination. Comparative measurements were undertaken with two different hydrophones in an overall range of 250 Hz to 500 kHz. With the measurements from all participating NMIs the KCRV (Key Comparison Reference Value) at each frequency can be calculated as is required by the MRA (Mutual Recognition Agreement), and with this the DOE (degree of equivalence) can be determined for each participant’s results from the KCRV. \n\nThis presentation will discuss the measurement requirements for this key comparison as well as the results from each participating NMI. Frequency ranges with good consistency between labs, and the causes of differing results between the KCRV and participant’s results.
  • Corresponding author: Mr Benjamin Ford
    Affiliation: NPL
    Country: United Kingdom
    e-mail:

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