IEC 62127-3:2022

Overview

IEC 62127-3:2022 - Ultrasonics - Hydrophones - Part 3: Properties of hydrophones for ultrasonic fields defines the properties and specification practices for miniature piezoelectric hydrophones used to measure pulsed and continuous ultrasonic fields in water. The second edition (2022) is a technical revision of the 2007/2013 edition and updates definitions, measurement procedures and informative annexes to reflect modern calibration and field‑mapping needs for medical and industrial ultrasound.

Key topics and technical requirements

• Scope and applicability: applies to piezoelectric hydrophones (with or without pre‑amplifiers) used for measurements in water, primarily for medical diagnostic and therapeutic ultrasound and many non‑medical ultrasonic field characterizations.
• Sensitivity: updated to treat hydrophone sensitivity as a complex‑valued quantity (amplitude and phase), enabling phase‑sensitive measurements when calibrations include phase response.
• Frequency response: requirements for stating frequency bands and characterizing frequency dependence; the 2022 edition removed the previous explicit upper frequency limit to accommodate broader frequency bands.
• Directional response and effective size: procedures for measuring and modelling hydrophone directivity and determining the effective hydrophone size have been revised (see Annex B rationale and Annex C membrane model).
• Dynamic range and linearity: guidance for lower/upper dynamic limits and electromagnetic interference considerations to ensure accurate field mapping.
• Electrical output characteristics: requirements for hydrophones with and without pre‑amplifiers, output lead configuration and related measurement conditions.
• Environmental and mechanical aspects: temperature range, water tightness, materials compatibility and exposed material notes.
• Documentation: manufacturers should provide a guidance manual and a standardized list of hydrophone characteristics (examples in informative Annex A).

Practical applications and users

This standard is used by:

• Medical physicists and ultrasound metrologists for calibration and quantitative mapping of diagnostic and therapeutic ultrasound fields (e.g., HIFU, lithotripsy, imaging probes).
• Calibration laboratories performing amplitude and phase calibrations of hydrophones.
• Ultrasound equipment manufacturers and R&D teams validating transducer output and beam patterns.
• Quality control and test engineers in non‑medical industries (cleaning baths, ultrasonic spectrometers, flowmeters) who require reliable field characterization.

Benefits include improved measurement traceability, clearer specification of hydrophone behaviour (including phase), and harmonized data for field comparisons and device certification.

Related standards

• Other parts of the IEC 62127 series (hydrophone calibration and usage).
• Mentioned overlap with underwater hydrophone standards such as IEC 60500 / IEC 60565‑1 / IEC 60565‑2, though those cover different application contexts (natural waters, different incidence angles).

Keywords: IEC 62127-3:2022, hydrophone properties, ultrasonic fields, piezoelectric hydrophones, hydrophone sensitivity, frequency response, effective hydrophone size, hydrophone calibration, medical ultrasound, directional response.