BS EN IEC 60565-1:2020: Underwater Acoustics - Hydrophone Calibration

Delve into the world of underwater acoustics with the comprehensive standard, BS EN IEC 60565-1:2020. This essential document is your gateway to mastering the calibration of hydrophones, specifically focusing on procedures for free-field calibration. Whether you are a professional in the field of underwater acoustics or a researcher seeking to enhance your knowledge, this standard is an invaluable resource.

Overview

The BS EN IEC 60565-1:2020 standard provides detailed guidelines and procedures for the calibration of hydrophones in a free-field environment. Hydrophones are critical instruments used to measure sound in water, and their accurate calibration is essential for reliable data collection and analysis. This standard ensures that you have the most up-to-date and precise methods at your disposal.

Key Features

• Standard Number: BS EN IEC 60565-1:2020
• Pages: 96
• Released: 2020-07-01
• ISBN: 978 0 580 97307 9
• Status: Standard

Why Choose BS EN IEC 60565-1:2020?

This standard is meticulously crafted to cater to the needs of professionals and researchers in the field of underwater acoustics. Here are some reasons why this standard is a must-have:

• Comprehensive Coverage: With 96 pages of detailed information, this standard covers all aspects of hydrophone calibration, ensuring you have a thorough understanding of the procedures involved.
• Up-to-Date Information: Released on July 1, 2020, this standard incorporates the latest advancements and methodologies in the field, providing you with the most current and relevant information.
• Expert Guidance: Developed by leading experts in underwater acoustics, this standard offers authoritative guidance and best practices for hydrophone calibration.
• Enhanced Accuracy: By following the procedures outlined in this standard, you can achieve greater accuracy in your measurements, leading to more reliable and precise data.

Applications

The BS EN IEC 60565-1:2020 standard is applicable in various fields and industries, including:

• Marine Research: Essential for researchers studying marine life and underwater environments, ensuring accurate sound measurements.
• Environmental Monitoring: Used in monitoring underwater noise pollution and its impact on marine ecosystems.
• Defense and Security: Critical for naval operations and underwater surveillance, where precise acoustic measurements are crucial.
• Oil and Gas Exploration: Utilized in the exploration and monitoring of underwater resources, where sound plays a key role in data collection.

Structure and Content

The standard is structured to provide a logical flow of information, making it easy to navigate and understand. It includes:

• Introduction: An overview of the importance of hydrophone calibration and the scope of the standard.
• Technical Specifications: Detailed technical requirements and specifications for hydrophone calibration.
• Calibration Procedures: Step-by-step procedures for conducting free-field calibration of hydrophones.
• Appendices: Additional resources and references to support the calibration process.

Conclusion

In the ever-evolving field of underwater acoustics, having access to the right standards is crucial for success. The BS EN IEC 60565-1:2020 standard is an indispensable tool for anyone involved in the calibration of hydrophones. Its comprehensive coverage, expert guidance, and up-to-date information make it a valuable asset for professionals and researchers alike.

Equip yourself with the knowledge and tools needed to excel in underwater acoustics by incorporating the BS EN IEC 60565-1:2020 standard into your work. With its detailed procedures and expert insights, you can ensure the accuracy and reliability of your hydrophone measurements, paving the way for groundbreaking discoveries and advancements in the field.

BS EN IEC 60565-1:2020

This standard BS EN IEC 60565-1:2020 Underwater acoustics. Hydrophones. Calibration of hydrophones is classified in these ICS categories:

• 17.140.50 Electroacoustics

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 threetransducer 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]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.