NBN EN 61102 : 1994

Cooperating organizations
National foreword
Foreword
Introduction
1. Scope
2. Normative references
3. Definitions
4. List of symbols
5. Measurement requirements
5.1 Requirements for hydrophones and amplifiers
5.1.1 General
5.1.2 Sensitivity of a hydrophone
5.1.3 Directional response of a hydrophone
5.1.4 Effective radius of a hydrophone active element
5.1.5 Choice of the size of a hydrophone active element
5.1.6 Bandwidth
5.1.7 Linearity
5.1.8 Hydrophone signal amplifier
5.2 Requirements for positioning systems and water
       baths
5.2.1 Positioning systems
5.2.2 Water bath
5.3 Requirements for measurement systems
5.4 Recommendations for ultrasonic equipment being
       characterised
6. Specification of performance for hydrophones and
       amplifiers
6.1 Sensitivity
6.2 Effective radius
6.3 Hydrophone linearity
6.4 Hydrophone amplifiers
7. Measurement procedures
7.1 Preparation and alignment
7.1.1 Preparation
7.1.2 Aligning a hydrophone
7.1.3 Aligning an ultrasonic transducer and hydrophone
8. Beam characterisation
8.1 Primary pressure parameters
8.1.1 Peak-positive and peak-negative acoustic pressure
8.1.2 Pulse acoustic pressure
8.1.3 Spatial-peak pulse acoustic pressure
8.1.4 Spatial-peak r.m.s. acoustic pressure
8.1.5 Beam-average pulse acoustic pressure
8.1.6 Beam-average r.m.s. acoustic pressure
8.1.7 Spatial-average pulse acoustic pressure
8.1.8 Spatial-average r.m.s. acoustic pressure
8.1.9 Nonlinear propagation parameter
8.2 Derived intensity parameters
8.3 Derived pulse-intensity integral parameters
9. Acoustic output specification and labelling
Annexes
A. (informative)
A.1 Hydrophones
A.1.1 Electrical loading considerations
A.1.2 Hydrophone signal amplifier
A.1.3 Alignment of hydrophones
A.1.4 Types of hydrophone
A.1.4.1 Ceramic probe hydrophones
A.1.4.2 PVDF probe hydrophones
A.1.4.3 PVDF membrane hydrophones
A.1.4.4 Relative performance of different types
A.1.5 Typical specification data for hydrophones
B. (informative)
B.1 Acoustic pressure and intensity
C. (informative)
C.1 Transducer and hydrophone positioning systems
D. (informative)
Rationale
Bibliography
Figures
Annex ZA (normative) Other international publications
quoted in this standard with the references of the
relevant European publications
National annex NA (informative) Committees responsible
National annex NB (informative) Cross-references

Specifies the methods of use of calibrated piezoelectric hydrophones for the measurement in liquids of acoustic fields generated by ultrasonic medical equipment operating in the 0,5 MHz to 15 MHz frequency range. Coverage includes definitions symbols, measurement requirements, measurement procedures and beam characterisation.