IEC 60866:1987

Contents
Foreword
Preface
List of Symbols
Clause
1. Scope
2. Object
3. Definitions
    3.1 Free field
    3.2 Far field
    3.3 Acoustic centre
    3.4 Hydrophone (or receiver)
    3.5 Reversible transducer
    3.6 Reciprocal transducer
    3.7 Open-circuit voltage at a hydrophone
    3.8 Free-field sensitivity of a hydrophone
    3.9 Free-field sensitivity level
    3.10 Transmitting response to current of a projector
    3.11 Reciprocity coefficient
    3.12 Directional response of a hydrophone
    3.13 End-of-cable leakage resistance
    3.14 Mechanical Q of hydrophone element
4. General introduction
    4.1 Choice of measurement method
    4.2 Basis of recommendations
    4.3 Effect of the finite size of hydrophones
    4.4 Hydrophone calibration
5. Hydrophone characteristics
    5.1 Sensitivity
    5.2 Directivity
    5.3 Electrical characteristics
    5.4 Mechanical characteristics
6. Specification of performance of a hydrophone
    6.1 Free-field voltage sensitivity
    6.2 Directivity
    6.3 Electrical aspects
    6.4 Mechanical and environmental aspects
7. Hydrophone calibration
    7.1 Reciprocity techniques
    7.2 Principle of the two-transducer reciprocity method
    7.3 Calibration measurement conditions
    7.4 Experimental method
    7.5 Calculation of results
    7.6 Accuracy
Appendix A - Rationale for the reciprocity procedure
Appendix B - Plane wave reciprocity
Appendix C - Details of the recommended experimental
             procedures
Appendix D - Evaluation of the correction factor, k
Appendix E - Bibliography
Figures

Relates to hydrophones, employing piezoelectric sensor elements, designed to measure the pulsed and continuous-wave ultrasonic fields generated by ultrasonic medical equipment operating in the frequency range 0.5 MHz to 15 MHz. Covers the design and performance requirements of standard hydrophones and the data required to specify their characteristics, and defines a standard method for the measurement of the sensitivity of such hydrophones.Defines the performance characteristics that are required of hydrophones intended for use in a specified range of applications over the frequency band from 0.5 MHz to 15 MHz, particularly those associated with the measurement of pulsed and continuous-wave ultrasonic fields used in medical diagnosis. Establishes a scheme for the specification of the performance of these hydrophones. Describes a standardized procedure for their calibration.