The project is to undertake a European intercomparison of free-field hydrophone calibrations in the frequency range 10-315 kHz.The exercice is to be organise as two round-robin intercomparisons with two separate sets of three hydrophones used (Set A and Set B), and with the NPL the coordinating laboratory calibrating both sets and a third set kept as a control. Each set would contain a Brüel and Kjaer 8104, Brüel and Kjaer 8103 and a Reson TC4034 hydrophone. The participants would be asked to undertake a free-field calibration of the hydrophones at third-octave frequencies in the frequency range 10-315 kHz by a method of their choice.The method employed are expected to be either calibration by three-transducer spherical-wave reciprocity or by comparison with a calibrated reference hydrophone. Two participants are expected to use open-water facilities, but most participants would use laboratory tank facilities.
Project supported by the European Committees. EC contact MAST-CT94-0095 was supported under the Marine science and Technology Programme and adminitered under Standards, Measurement and Testing Programme.
Project was completed and final report and associated papers published in 1997-1999.
S P Robinson, R C Preston and G J Green. International comparison of free-field hydrophone calibrations in the frequency range 10-315 kHz. Metrologia, vol. 36, p 287-296, 1999.
S P Robinson, R C Preston and G J Green. An intercomparison of hydrophone calibrations within Europe Proceedings of the IOA, vol 20, part 3, page 1-8, 1998.
S P Robinson, R C Preston and G J Green. An intercomparison of hydrophone calibrations within Europe. JASA vol 103, n5, pt 2, page 2755, May 1998.
S P Robinson and Geraint Green. An intercomparison to validate calibration methods for hydrophones in the frequency range 10-315 kHz. NPL Report CIRA(EXT) 020, February 1997.