Overview of Underwater Acoustics Standards
At the international level, there is a key standard covering the calibration of hydrophones:
IEC60565:2006, Underwater acoustics - Hydrophones - Calibration in the frequency range 0.01 Hz to 1 MHz, IEC 60565-2006.
This standard has comprehensive coverage of techniques for calibration of hydrophones in free-field conditions, and at low-frequencies in specialised couplers. It is currently under revision by IEC Technical Committee 87 (TC87) – Working Group 15 (WG15) and is likely to be divided into two parts: one for free-field techniques and one for low-frequency pressure calibration techniques.
ISO Technical Committee 43, Sub-Committee 3 (ISO TC43 SC3) covers underwater acoustics, and has produced a Publically Available Specification (PAS) covering the topic of measurement of ship noise in deep water:
ISO/PAS 17208-1:2012, Acoustics - Quantities and procedures for description and measurement of underwater sound from ships. Part 1: General requirements for measurements in deep water.
There are a number of relevant standards covering definitions and terminology produced by IEC and ISO. Four relevant standards are:
IEC 60050:1994, International Electrotechnical Vocabulary, part 801: Acoustics Electroacoustics, (section 801-32 covers terms for underwater acoustics).
IEC 60260:1995, Electroacoustics – Octave-band and fractional-octave band filters.
ISO 80000-8: 2007, Quantities and units - part 8: Acoustics.
ISO/TR 25417:2007, Acoustics - Definitions of basic quantities and terms.
In the USA, ANSI has produced two standards relevant to underwater acoustic measurement:
ANSI S12.64-2009/Part 1, Quantities and Procedures for Description and Measurement of Underwater Sound from Ships - Part 1: General Requirements.
ANSI S1.20-2012, Procedures for Calibration of Underwater Electroacoustic Transducers.
ANSI S12.64 was the document upon which ISO/PAS 17208-1:2012 was based, and ANSI S1.20 provides a broader coverage than IEC 60565 as it considers the calibration of other types of electroacoustic transducers (not just hydrophones). ANSI S1.20 also provides information on a standard-target method for calibrating active sonars. These documents are available at: http://webstore.ansi.org.