IEC 60565-1-2020 pdf free

IEC 60565-1-2020 pdf free.Underwater acoustics – Hydrophones – Calibration of hydrophones – Part 1: Procedures for free-field calibration of hydrophones.
Procedures for pressure hydrophone calibration at low frequencies can be found in
IEC 60565-2 [iJI. Procedures for hydrophone calibration at acoustic frequencies greater than
1 MHz are covered by IEC 62 127-2 [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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60050-801, international Electrotechnical Vocabulary — Chapter 801: Acoustics and electroacoustAcs (available at http:l/www.electropedia .orgl)
IEC 60500:2017, Underwater acoustics — Hydrophones — Properties of the hydrophone in the frequency range 1 Hz to 500 kHz
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-801, IEC 60500:2017 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 acoustic far-field sound field at a sufficient distance from a sound source In a uniform medium where the sound pressure and sound particle velocity are substantially in phase and the direct-path sound pressure amplitude, compensated for absorption loss, varies inversely with distance
Note 1 to entry: The range (distance from the source) Is taken along a dIrect path between the source and the receiver.
Note 2 to entry: The Inverse dependence on range does not Imply that the source radiates equally In all directions.
[SOURCE: IEC 60050-801:1994, 801-23-30, modified — In the definition, and the direct-path sound pressure amplitude, compensated for absorption loss, varies inversely with distance has been added. sourced from ISO 18405:201 7, 3.3.1.1.] IEC 60565-1 pdf free download.