IEC 60565-1-2020 水下声学--水听器--水听器的校准--第1部分:水听器的自由场校准程序 Underwater acoustics – Hydrophones – Calibration of hydrophones – Part 1: Procedures for free-field calibration of hydrophones

This part of IEC 60565 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.dition 1.0 2020-04 INTERNATIONAL STANDARD NORME INTERNATIONALE colour inside Underwater acoustics – Hydrophones – Calibration of hydrophones – Part 1: Procedures for free-field calibration of hydrophones Acoustique sous-marine – Hydrophones – étalonnage des hydrophones – Partie 1: Procédures d'étalonnage en champ libre des hydrophones IEC 60565-1:2020-04(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright ？ 标准截图