BS EN IEC 60565-2:2019
$198.66
Underwater acoustics. Hydrophones. Calibration of hydrophones – Procedures for low frequency pressure calibration
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 58 |
This part of IEC 60565 specifies the methods for low frequency pressure calibration of hydrophones at frequencies from 0,01 Hz to several kilohertz depending on calibration method.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 5 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 8 | English CONTENTS |
| 11 | FOREWORD |
| 13 | INTRODUCTION |
| 14 | 1 Scope 2 Normative references 3 Terms and definitions |
| 18 | 4 Symbols |
| 19 | 5 Procedures for calibration 5.1 Principles |
| 20 | 5.2 Field limitations 5.3 Schematic survey of procedures 5.4 Reporting of results |
| 21 | 5.5 Recalibration periods 5.6 Temperature and pressure considerations for calibration 5.7 Preparation of transducers 6 Electrical measurements 6.1 Signal type 6.2 Earthing 6.3 Measurement of hydrophone output voltage 6.3.1 General 6.3.2 Electrical loading by measuring instrument |
| 22 | 6.3.3 Electrical loading by extension cable 6.3.4 Cross-talk and acoustic interference 6.3.5 Integral pre-amplifier 6.4 Measurement of projector current 7 Calibration by hydrostatic excitation 7.1 General 7.2 Principle 7.2.1 Determination of the alternating pressure |
| 23 | Figures Figure 1 – Diagram of calibration by hydrostatic excitation |
| 24 | 7.2.2 Determination of the correction factor 7.2.3 Determination of the equivalent height |
| 26 | 7.2.4 Calculation of the pressure sensitivity of hydrophone 7.3 Design of vibration system 7.4 Alternative method for hydrostatic excitation |
| 27 | 7.5 Uncertainty 8 Calibration by piezoelectric compensation 8.1 General 8.2 Principle 8.2.1 Determination of the sound pressure |
| 28 | 8.2.2 Determination of the characteristic constant Figure 2 – Schematic drawing of calibration by piezoelectric compensation |
| 29 | 8.2.3 Calculation of the pressure sensitivity of hydrophone 8.3 Design of the calibration chamber 8.3.1 General 8.3.2 Low frequency chamber 8.3.3 High frequency chamber |
| 30 | 8.4 Practical limitations of the piezoelectric compensation method 8.5 Relative calibration method Figure 3 – Diagram of the chamber for high frequency |
| 31 | 8.6 Uncertainty 9 Calibration by acoustic coupler reciprocity 9.1 General 9.2 Principle 9.2.1 Theory of acoustic coupler reciprocity |
| 32 | 9.2.2 Procedures for the reciprocity calibration Figure 4 – Reciprocity coupler with three transducers: a projector P,a reciprocal transducer T, and a hydrophone H to be calibrated |
| 33 | 9.2.3 Calculation of transfer impedance 9.2.4 Determination of acoustic compliance 9.3 Limitation of acoustic coupler reciprocity 9.3.1 Frequency limit |
| 34 | 9.3.2 Hydrophone limit 9.4 Measurement 9.4.1 General 9.4.2 Evidence of interference effects 9.4.3 Reciprocity verification |
| 35 | 9.4.4 Linearity verification 9.5 Uncertainty 10 Calibration by pistonphone 10.1 General 10.2 Principle 10.2.1 Determination of the sound pressure |
| 36 | 10.2.2 Determination of the compliance of the medium 10.2.3 Calculation of the pressure sensitivity 10.3 Limitations |
| 37 | 10.4 Relative calibration 10.4.1 Comparison with a reference transducer 10.4.2 Comparison using air–water pistonphone |
| 38 | 10.5 Uncertainty 11 Calibration by vibrating column 11.1 General 11.2 Principle 11.2.1 General Figure 5 – Comparison calibration using pistonphone with calibrated hydrophone |
| 39 | 11.2.2 Expression for the pressure Figure 6 – Diagram of calibration by vibrating column |
| 40 | 11.2.3 Determination of the sensitivity |
| 41 | 11.3 Conditions of measurement 11.3.1 Mechanical |
| 42 | 11.3.2 Acoustical 11.4 Relative calibration method |
| 43 | 11.5 Uncertainty 12 Calibration by static pressure transducer 12.1 General Figure 7 – Diagram of calibration by vibrating column using comparison |
| 44 | 12.2 Principle 12.2.1 Theory of static pressure calibration 12.2.2 Determination of the sensitivity of static pressure transducer Figure 8 –Diagram of comparison calibration using static pressure transducer |
| 45 | 12.2.3 Calculation of the pressure sensitivity 12.3 Limitations 12.4 Uncertainty |
| 46 | Annex A (informative)Advanced acoustic coupler calibration methods A.1 General |
| 47 | A.2 Acoustic-coupler calibration using a reference coupler with two reciprocal transducers and an auxiliary coupler with the same two transducers and a hydrophone to be calibrated A.2.1 General |
| 48 | A.2.2 Theory Figure A.1 – Reference coupler with two transducers: a projector P anda reciprocal transducer T Figure A.2 – Auxiliary coupler with three transducers: a projector P,a reciprocal transducer T and a hydrophone H to be calibrated |
| 49 | A.3 Acoustic-coupler calibration using a reference coupler with two reciprocal transducers and an auxiliary coupler with the same two transducers, a hydrophone to be calibrated, and a sound source A.3.1 General |
| 50 | A.3.2 Theory Figure A.3 – Auxiliary coupler with four transducers: a projector P, a reciprocaltransducer T, a sound source S and a hydrophone H to be calibrated |
| 51 | A.4 Acoustic-coupler calibration using a coupler, a reciprocal transducer, a projector, a hydrophone to be calibrated, and a subsidiary body of known compliance A.4.1 General A.4.2 Theory |
| 52 | Figure A.4 – Schematic drawing of the measuring system |
| 54 | Annex B (informative)Assessment of uncertainty in the low frequencypressure calibration of hydrophone B.1 General B.2 Type A evaluation of uncertainty B.3 Type B evaluation of uncertainty B.4 Reported uncertainty |
| 55 | B.5 Common sources of uncertainty |
| 57 | Bibliography |
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