IEC 60565-1-ed.1.0

Detail information

Designation: IEC 60565-1-ed.1.0

Publication date: 24/04/2020

Pages: 183

Country: International technical standard

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Anotation

IEC 60565-1:2020 specifies methods and procedures for free-field calibration of hydrophones, as well as individual electroacoustic transducers that can be used as hydrophones (receivers) and/or projectors (source transducers). Two general types of calibration are covered within this document: absolute calibration using the method of three-transducer spherical-wave reciprocity, and relative calibration by comparison with a reference device which has already been the subject of an absolute calibration. The maximum frequency range of the methods specified in this document is from 200 Hz to 1 MHz. The lowest acoustic frequency of application will depend on a number of factors, and will typically be in the range 200 Hz to 5 kHz depending mainly on the dimensions of the chosen test facility, The highest frequency of application for the methods described here is 1 MHz. Procedures for pressure hydrophone calibration at low frequencies can be found in IEC 60565 2 [1] . Procedures for hydrophone calibration at acoustic frequencies greater than 1 MHz are covered by IEC 62127-2 [2]. Excluded from the scope of this document are low-frequency pressure calibrations of hydrophones, which are described in IEC 60565-2 [1]. Also excluded are calibrations of digital hydrophones and systems, calibration of marine autonomous acoustic recorders, calibration of acoustic vector sensors such as particle velocity sensors and pressure gradient hydrophones, calibration of passive sonar arrays consisting of multiple hydrophones, and calibration of active sonar arrays consisting of projectors and hydrophones. This document presents a description of the requirements for free-field calibration in terms of test facility, equipment and instrumentation, signal processing, and frequency limitations. A description of achievable uncertainty and rules for the presentation of the calibration data are provided. Also included are informative annexes that provide additional guidance on • measurement of directional response of a hydrophone or projector, • measurement of electrical impedance of hydrophones and projectors, • electrical loading corrections, • acoustic far-field criteria in underwater acoustic calibration, • pulsed techniques in free-field calibrations, • assessment of uncertainty in the free-field calibration of hydrophones and projectors, • derivation of the formulae for three-transducer spherical-wave reciprocity calibrations, • calibration using travelling-wave tubes, • calibration of hydrophones using optical interferometry, and • calibrations in reverberant water tanks using continuous signals. IEC 60565-1:2020 together with IEC 60565-2:2019, cancels and replaces the second edition of IEC 60565 published in 2006. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: 1) removal of all descriptions of methods for pressure calibrations of hydrophones – these are now included in Part 2; 2) removal of the derivations of formulae for free-field reciprocity calibration (both amplitude sensitivity and phase sensitivity) and placement of these into an informative annex; 3) inclusion within the scope of the calibration of the transmitting response of individual source transducers and hydrophones (but not sonar arrays); 4) re-ordering of the sections within the document such that the more general procedures for calibration such as guidance on obtaining conditions of acoustic free-field, far-field, and steady-state, appear before the descriptions of procedures for absolute or relative calibrations; 5) revision of informative Annex A to include guidance on measurement of directional response of a hydrophone or projector; 6) addition of a new informative Annex B on measurement of electrical impedance of hydrophones and projectors; 7) revision of the previous informative annex on electrical loading corrections to include corrections to account for electrical loading by added cables (now Annex C); 8) addition of a new informative Annex D on acoustic far-field criteria in underwater acoustic calibration; 9) revision of the previous informative annex on pulsed techniques in free-field calibrations (now Annex E); 10) revision of the previous informative annex on assessment of uncertainty in the calibration of hydrophones (now Annex F); 11) deletion of the previous informative annex on equivalent circuit of the excitation system for calibration with a vibrating column; 12) addition of a new informative Annex G on derivation of the formulae for three-transducer spherical-wave reciprocity calibration; 13) addition of a new informative Annex H on calibration using travelling-wave tubes; 14) addition of a new informative Annex I on calibration of hydrophones using optical interferometry. 15) addition of a new informative Annex J on calibration in reverberant water tanks using continuous signals. LIEC 60565-1:2020 specifie les methodes et procedures detalonnage en champ libre des hydrophones, ainsi que des transducteurs electroacoustiques individuels qui peuvent etre utilises comme hydrophones (recepteurs) et/ou projecteurs (transducteurs sources). Deux grands types detalonnage sont couverts par le present document: letalonnage absolu utilisant la methode par reciprocite d’onde spherique a trois transducteurs, et letalonnage relatif par comparaison avec un dispositif de reference qui a deja fait lobjet dun etalonnage absolu. La plage de frequences maximale des methodes specifiees dans le present document est comprise entre 200 Hz et 1 MHz. La frequence acoustique la plus faible de lapplication depend dun certain nombre de facteurs, et est en general comprise entre 200 Hz et 5 kHz selon les dimensions de linstallation dessai choisie. La frequence la plus elevee de lapplication pour les methodes decrites ici est de 1 MHz. Les procedures detalonnage de lhydrophone a pression aux basses frequences peuvent etre consultees dans lIEC