Robinson, S P; Harris, P M; Ford, B; Ablitt, J; Chen, Y; Biber, A; Corakci, A C; Costa-Felix, R; Crocker, S; Isaev, A; Tyalimpi, V; Latha, G (2022) CCAUV.W-K2 Final Report - Key Comparison CCAUV.W-K2: Calibration of hydrophones in the frequency range from 250 Hz to 500 kHz. NPL Report. AC 20

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Abstract

This report is the Final Report for Key Comparison CCAUV.W-K2. This Key Comparison covers primary free-field standards for sound in water at frequencies between 250 Hz and 500 kHz. This project is one of the Key Comparisons organised under the auspices of the Consultative Committee on Acoustics, Ultrasound and Vibration (CCAUV) of the CIPM.

This report has the status of a Final Report and has been submitted to the Key Comparison Database (KCDB). In the report, the results of participants are presented with the Key Comparison Reference Values and Degrees of Equivalence. The results are calculated according to the procedures agreed after consideration of the Draft A1 and A2 reports, and the Draft B report has been approved by the CCAUV. All participants have had the opportunity to give final agreement on the contents and amendments have been made to account for their comments.

In many respects, the comparison has been a success with good agreement achieved over an extended lower frequency range compared to the previous CCAUV.W-K1 comparison, the lower frequency limit for CCAUV.W-K2 being extended down by two octaves to 250 Hz. The generally more difficult frequency range from 100 kHz to 500 kHz has also shown very good agreement between the participants. However, in the range 60 kHz to 100 kHz the agreement was not as good, with three participants exhibiting some discrepant results.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	AC 20
Keywords:	Key Comparison ; Hydrophone ; CCAUV
Subjects:	Acoustics > Underwater Acoustics
Divisions:	Medical, Marine & Nuclear
Identification number/DOI:	10.47120/npl.AC20
Last Modified:	18 Jan 2023 15:25
URI:	https://eprintspublications.npl.co.uk/id/eprint/9632