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Underwater acoustics

Hydrophone calibration

A unique range of underwater acoustic services  

NPL currently provides the following hydrophone calibration services, most of which are accredited to ISO17025:

  • Free-field calibration of hydrophones by the reciprocity method in the NPL tank facilities in the frequency range from 315 Hz to 500 kHz.
  • Free-field calibration of hydrophones by a comparison method in the NPL tank facilities in the frequency range from 1 kHz to 1 MHz.
  • Pressure calibration of hydrophones by comparison method from 5 Hz to 315 Hz
  • Directional response measurement of hydrophones and transducers in the frequency range 1 kHz to 1 MHz over 360 degrees of rotation in both the horizontal and vertical plane in the NPL tank facilities

Other measurements include transducer electrical impedance/admittance in the frequency range 1 Hz to 20 MHz, and directional response/beam patterns of transducers and transducer efficiency.

Calibration of marine autonomous recorders

NPL also offers the only service for pressure calibration of digital marine autonomous recorders in the frequency range 20 Hz to 315 Hz.

Don’t see what you are looking for? Our diverse skill set enables us to provide bespoke solutions. Please contact us to discuss your requirements.

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