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Specification for the calibration of hydrophones
:
Available format(s): Hardcopy, PDF
Superseded date: 28-02-2007
Language(s): English
Published date: 31-01-1979
Publisher: British Standards Institution
National forewordCooperating organizationsList of symbols1 Scope2 Purposes3 Definitions3.1 Free field3.2 Far field3.3 Acoustic centre3.4 Hydrophone3.5 Underwater sound projector3.6 Reversible transducer3.7 Reciprocal transducer3.8 Open-circuit voltage at hydrophone3.9 Free-field sensitivity of a hydrophone3.10 Pressure sensitivity of a hydrophone3.11 Transmitting response to a current of a projector3.12 Electrical terminals of a reciprocal transducer3.13 Electrical impedance of a transducer3.14 Electrical transfer impedance magnitude of a transducer pair3.15 Pistonphone3.16 Vibrating column3.17 Equivalent noise pressure3.18 Dynamic range3.19 Directional response3.20 Principal axis3.21 Omnidirectionality3.22 Types of directional transducers3.23 Co-ordinate system4 Procedures for calibration4.1 Principles4.2 Field limitations4.3 Schematic survey of procedures5 Preparation of the transducers5.1 Wetting5.2 Hydrophone support5.3 Influence of the cable6 Electrical measurements6.1 Signal type6.2 Earthing6.3 Measurement of hydrophone output voltage6.4 Measurement of projector current6.5 Measurement of transfer impedance magnitude7 Free-field reciprocity calibration7.1 Scope7.2 Object7.3 General principle7.4 Theory7.5 Separation distance7.6 Minimum distance from transducers to boundary surfaces7.7 Signal type7.8 Frequency limitations7.9 Measurements8 Free-field calibration by comparison8.1 Scope8.2 Object8.3 Principle8.4 Comparison with a standard hydrophone8.5 Calibration with a calibrated projector9 Compensation in a closed chamber9.1 Scope9.2 Object9.3 Introduction9.4 Calibration by electrodynamic compensation9.5 Calibration by piezoelectric compensation9.6 Design of the electrodynamic compensation chamber9.7 Design of the piezoelectric compensation chamber9.8 Practical limitations of the electrodynamic compensation method9.9 Practical limitations of the piezoelectric compensation method10 Calibration with a pistonphone10.1 Scope10.2 Object10.3 Introduction10.4 Restrictions10.5 Sound pressure10.6 Corrections10.7 Absolute calibration10.8 Calibration by comparison11 Calibration with a vibrating column11.1 Scope11.2 Object11.3 Introduction11.4 Expression of the sensitivity11.5 Determination of the sensitivity11.6 Conditions of measurement11.7 AccuracyAppendix A - Measurement of transfer impedance magnitude by the substitution methodAppendix B - Measurement of the transfer impedance magnitude by the direct read-out methodAppendix C - Pulse technique in free-field calibrationAppendix D - Directional response of a hydrophoneAppendix E - Equivalent circuit of the excitation systemBibliography
Methods for the measurement of the sensitivity of hydrophones, particularly in the frequency range 1 Hz to 1 MHz, and rules for the presentation of the calibration data.
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