IEC 63305:2024 specifies methods and procedures for calibration of vector receivers in the frequency range 5 Hz to 10 kHz, which are applicable to vector receivers based on the two different principles. In addition, it describes an absolute method of inertial vector receiver calibration in air using optical interferometry. Usually, acoustic wave vector receivers are designed and constructed based on one of two principles. One is the sound pressure difference (gradient) principle. When measuring with this sensor, the vector receiver is rigidly fixed on a mount and supported in water. The other is the co-vibrating (inertial) principle. When measuring with this sensor, the vector receiver is suspended on a mount and supported in water in a non-rigid manner, which allows the vector receiver co-vibrate in the same direction as the sound particle in the sound wave field. Many methods have been used to calibrate vector receivers, such as free-field calibration, calibration in standing wave tube and calibration in a travelling wave tube.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Annex ZA (normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 4 List of symbols <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 5 Relationship of vector quantities in sound field <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 6 General procedures for calibration 6.1 General calibration requirements 6.1.1 Types of calibration 6.1.2 Acoustic field requirements <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 6.2 Acoustic standing wave tube requirements 6.2.1 Requirements for standing wave tube [8] <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 6.2.2 Requirements for immersed depth of transducers Figures Figure 1 \u2013 The structure of the calibration chamber <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 6.3 Acoustic travelling wave tube requirements 6.3.1 Requirements for driving signal 6.3.2 Requirements for the travelling wave tube 6.4 Equipment requirements 6.4.1 Calibration facility <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 6.4.2 Instrumentation <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 6.5 Positioning and alignment 6.5.1 Coordinate system 6.5.2 Reference direction 6.5.3 Transducer mounting and support <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 6.5.4 Alignment Figure 2 \u2013 Co-vibrating vector receiver suspended on a mounting ring <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 6.6 Representation of the frequency response 6.7 Frequency limitations 6.7.1 High-frequency limit 6.7.2 Low frequency limit <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 6.8 Checks for acoustic interference 7 Electrical measurements 7.1 Signal type 7.2 Electrical earthing 7.3 Measurement of transducer output voltage 7.3.1 General <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | 7.3.2 Signal analysis 7.3.3 Electrical loading by measuring instrument 7.3.4 Electrical loading by extension cables 7.3.5 Electrical noise <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 7.3.6 Cross-talk 7.3.7 Integral preamplifiers 7.4 Measurement of projector drive current 7.4.1 Instrumentation 7.4.2 Signal analysis 8 Preparation of measurement 8.1 Preparation of transducers 8.1.1 Soaking <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | 8.1.2 Wetting 8.2 Environmental conditions (temperature and depth) 9 Free-field calibration 9.1 Free-field reciprocity calibration 9.1.1 General <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | 9.1.2 Principle Figure 3 \u2013 Measurement framework for free-field reciprocitycalibration of the vector receiver <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | 9.1.3 Measurement 9.1.4 Uncertainty 9.2 Free-field calibration using optical interferometry 9.2.1 General 9.2.2 Principle <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | 9.2.3 Measurement Figure 4 \u2013 Schematic diagram of free-field calibration for vector receiver using an optical interferometer <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | 9.2.4 Uncertainty 9.3 Free-field calibration using a reference hydrophone 9.3.1 General 9.3.2 Principle Figure 5 \u2013 Schematic diagram of free-field comparison calibrationfor vector receiver using reference hydrophone <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | 9.3.3 Measurement 9.3.4 Uncertainty 10 Calibration in standing wave tube 10.1 Calibration using reference accelerometer 10.1.1 General 10.1.2 Principle <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | Figure 6 \u2013 Schematic diagram of vertical standing wave tube calibration using reference accelerometer <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | 10.1.3 Measurement 10.1.4 Uncertainty 10.2 Comparison calibration using reference hydrophone in standing wave tube 10.2.1 General 10.2.2 Principle <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | Figure 7 \u2013 Schematic diagram of vertical standing wavetube calibration using reference hydrophone <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | 10.2.3 Measurement 10.2.4 Uncertainty 10.3 Horizontal standing wave tube calibration 10.3.1 General 10.3.2 Principle <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | Figure 8 \u2013 Schematic diagram of calibration principleand horizontal standing wave tube calibration <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | 10.3.3 Measurement 10.3.4 Uncertainty 10.4 Calibration using optical interferometry in standing wave tube 10.4.1 General 10.4.2 Principle <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | Figure 9 \u2013 Schematic diagram of calibration for vector receiver using optical interferometer in standing wave tube <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | 10.4.3 Measurement 10.4.4 Uncertainty 11 Calibration in a travelling wave tube 11.1 General <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | 11.2 Principle 11.2.1 General Figure 10 \u2013 Schematic diagram of calibration for vectorreceiver in a travelling wave tube <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | 11.2.2 Establishment of a unidirectional, plane progressive wave field <\/td>\n<\/tr>\n | ||||||
| 52<\/td>\n | 11.2.3 Sensitivity calculations 11.2.4 Uncertainty 12 Reporting of results 12.1 Sensitivity <\/td>\n<\/tr>\n | ||||||
| 53<\/td>\n | 12.2 Sensitivity level 12.3 Environmental considerations for calibration 12.4 Calibration uncertainties 12.5 Auxiliary metadata <\/td>\n<\/tr>\n | ||||||
| 54<\/td>\n | 13 Recalibration periods <\/td>\n<\/tr>\n | ||||||
| 55<\/td>\n | Annex A (informative)Directional response of a vector receiver A.1 General principle A.2 Types of measurement implementation A.3 Coordinate system A.4 Measurement of vector receiver directional response <\/td>\n<\/tr>\n | ||||||
| 56<\/td>\n | A.5 Calculation of angular deviation loss A.6 Uncertainty <\/td>\n<\/tr>\n | ||||||
| 57<\/td>\n | Annex B (informative)Inertial vector receiver calibration using optical interferometry in air B.1 General B.2 Principle B.3 Procedure <\/td>\n<\/tr>\n | ||||||
| 58<\/td>\n | Figure B.1 \u2013 Schematic diagram of calibration using opticalinterferometer in air for inertial vector receiver <\/td>\n<\/tr>\n | ||||||
| 59<\/td>\n | B.4 Discussion <\/td>\n<\/tr>\n | ||||||
| 60<\/td>\n | Annex C (informative)Assessment of uncertainty of vector receiver calibration C.1 General C.2 Type A evaluation of uncertainty C.3 Type B evaluation of uncertainty C.4 Reported uncertainty <\/td>\n<\/tr>\n | ||||||
| 61<\/td>\n | C.5 Common sources of uncertainty <\/td>\n<\/tr>\n | ||||||
| 64<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Underwater acoustics. Calibration of acoustic wave vector receivers in the frequency range 5 Hz to 10 kHz<\/b><\/p>\n |