ISO 18405:2017

Overview

ISO 18405:2017 – Underwater Acoustics Terminology establishes a standardized vocabulary for the field of underwater acoustics. Published by the International Organization for Standardization (ISO), this standard defines essential terms and expressions used to describe sound phenomena underwater, covering natural, biological, and anthropogenic (man-made) sources. The standard addresses the processes of sound generation, propagation, reception, and scattering in the underwater environment, including interactions with the seabed, sea surface, and biological organisms. ISO 18405:2017 is crucial for professionals requiring precise and consistent terminology in underwater sound research, environmental impact studies, marine biology, and ocean engineering.

Key Topics

• General Terms: Definitions related to fundamental concepts such as sound, ambient sound, and soundscapes in underwater contexts.
• Acoustical Field Quantities: Standardized terminology for quantities like sound pressure, particle displacement, particle velocity, and sound intensity.
• Acoustical Power Quantities: Terms describing mean-square and time-integrated squared values for sound pressure, particle displacement, and related measurements.
• Propagation and Scattering: Terminology for phenomena such as reverberation, reflection, and transmission of sound as it travels and interacts within the underwater environment.
• Bioacoustics: Definitions relevant to biological production, reception, and the effect of underwater sound on aquatic life.
• Levels and Reference Values: Comprehensive standards for expressing sound levels and differences, including use of decibels and reference quantities.

Applications

ISO 18405:2017 provides practical value across a range of underwater acoustics applications, including:

• Marine Environmental Assessment: Enables environmental professionals to use consistent terms when assessing the effects of underwater sound on marine animals and ecosystems.
• Acoustic Surveying and Oceanography: Facilitates accurate communication of underwater sound measurements and modeling in scientific research, mapping, and exploration.
• Underwater Noise Management: Assists regulatory authorities and the shipping industry in defining and quantifying noise emissions for compliance and impact assessment.
• Sonar and Underwater Communication: Supports engineers and researchers in developing, testing, and evaluating sonar systems and underwater communication devices through harmonized terminology.
• Hydrophone Calibration and Testing: Provides the basis for calibration, measurement, and reporting practices to ensure compatibility across laboratories and industries.
• Fisheries and Marine Biology: Aids in the analysis of natural and anthropogenic underwater soundscapes, with standardized terms for bioacoustics.

Organizations and professionals benefit from ISO 18405:2017 by reducing confusion, improving the clarity of technical documentation, ensuring consistency in international research projects, and streamlining compliance with environmental and industry regulations.

Related Standards

Practitioners working with ISO 18405:2017 may find the following related international standards useful:

• ISO 80000 Series: Standard for quantities and units, including specialized sections on acoustics.
• ISO 1683: Reference values for acoustical measurements.
• IEC 60050 (Electropedia): International Electrotechnical Vocabulary, including terminology relevant to underwater acoustics.
• ANSI/ASA S1.1: American National Standard for Acoustical Terminology, which provides complementary definitions and measurement principles.
• ISO/TR 25417: Technical report offering additional acoustic measurement definitions and background.

For further reference, the ISO Online Browsing Platform and IEC Electropedia provide searchable access to standard terms and definitions.

ISO 18405:2017 is an essential resource for unifying language in the growing field of underwater acoustics, supporting scientific advancement, sustainable environmental management, and technological innovation worldwide.