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BS EN IEC 63305:2024

BS EN IEC 63305:2024

$198.66

Underwater acoustics. Calibration of acoustic wave vector receivers in the frequency range 5 Hz to 10 kHz

Published By Publication Date Number of Pages
BSI 2024 68
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
6 English
CONTENTS
9 FOREWORD
11 INTRODUCTION
12 1 Scope
2 Normative references
3 Terms and definitions
18 4 List of symbols
20 5 Relationship of vector quantities in sound field
21 6 General procedures for calibration
6.1 General calibration requirements
6.1.1 Types of calibration
6.1.2 Acoustic field requirements
22 6.2 Acoustic standing wave tube requirements
6.2.1 Requirements for standing wave tube [8]
23 6.2.2 Requirements for immersed depth of transducers
Figures
Figure 1 ā€“ The structure of the calibration chamber
24 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
25 6.4.2 Instrumentation
27 6.5 Positioning and alignment
6.5.1 Coordinate system
6.5.2 Reference direction
6.5.3 Transducer mounting and support
28 6.5.4 Alignment
Figure 2 ā€“ Co-vibrating vector receiver suspended on a mounting ring
29 6.6 Representation of the frequency response
6.7 Frequency limitations
6.7.1 High-frequency limit
6.7.2 Low frequency limit
30 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
31 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
32 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
33 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
34 9.1.2 Principle
Figure 3 ā€“ Measurement framework for free-field reciprocitycalibration of the vector receiver
36 9.1.3 Measurement
9.1.4 Uncertainty
9.2 Free-field calibration using optical interferometry
9.2.1 General
9.2.2 Principle
37 9.2.3 Measurement
Figure 4 ā€“ Schematic diagram of free-field calibration for vector receiver using an optical interferometer
38 9.2.4 Uncertainty
9.3 Free-field calibration using a reference hydrophone
9.3.1 General
9.3.2 Principle
Figure 5 ā€“ Schematic diagram of free-field comparison calibrationfor vector receiver using reference hydrophone
39 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
40 Figure 6 ā€“ Schematic diagram of vertical standing wave tube calibration using reference accelerometer
41 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
42 Figure 7 ā€“ Schematic diagram of vertical standing wavetube calibration using reference hydrophone
43 10.2.3 Measurement
10.2.4 Uncertainty
10.3 Horizontal standing wave tube calibration
10.3.1 General
10.3.2 Principle
44 Figure 8 ā€“ Schematic diagram of calibration principleand horizontal standing wave tube calibration
45 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
46 Figure 9 ā€“ Schematic diagram of calibration for vector receiver using optical interferometer in standing wave tube
47 10.4.3 Measurement
10.4.4 Uncertainty
11 Calibration in a travelling wave tube
11.1 General
48 11.2 Principle
11.2.1 General
Figure 10 ā€“ Schematic diagram of calibration for vectorreceiver in a travelling wave tube
49 11.2.2 Establishment of a unidirectional, plane progressive wave field
52 11.2.3 Sensitivity calculations
11.2.4 Uncertainty
12 Reporting of results
12.1 Sensitivity
53 12.2 Sensitivity level
12.3 Environmental considerations for calibration
12.4 Calibration uncertainties
12.5 Auxiliary metadata
54 13 Recalibration periods
55 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
56 A.5 Calculation of angular deviation loss
A.6 Uncertainty
57 Annex B (informative)Inertial vector receiver calibration using optical interferometry in air
B.1 General
B.2 Principle
B.3 Procedure
58 Figure B.1 ā€“ Schematic diagram of calibration using opticalinterferometer in air for inertial vector receiver
59 B.4 Discussion
60 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
61 C.5 Common sources of uncertainty
64 Bibliography

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